|
Anonymous. 1987. ... but the
cheetah's future is rosier. New Scientist, 9.4.1987. 1 p.
|
The discovery that East
African cheetahs are genetically more diverse than the South African form,
indicate that the cheetahs suffered a population crash about 10'000 years ago
and offers hope that careful programes might improve the gene pool in the South
African subspecies.
|
Anonymous_1987_But_the_cheetahs_future_is_rosier.pdf
|
|
Anonymous. 1985. Diverse genes
sought to save cheetahs. International Herald Tribune . 19 September 1985
|
Studies of cheetah's genetic
variation and immune response lead to the conclusion that the species could be
soon vulnerable to extinction. Careful breeding would have to take place with
unrelated cheetahs in captivity in order to save the species. |
Anonymous
1985 Genes sought to save cheetahs.pdf
|
|
Anonymous. 1985. Gene-blues for the
cheetah. New Scientist, 16 May 1985, 21.
|
Lack of genetic variation threatens the survival of
the cheetah. Research produced evidence of poor reproductive success and
vulnerability to diseases.
|
Anonymous
1985 Gene-blues for the cheetah.pdf
|
|
Anonymous. 1989. King
cheetahs are tabbies. Cat News 11, 18..
|
The striking blotched
and striped coat of the rare king cheetah (Acinonyx
jubatus rex) is now believed to be a mutation of the
tabby gene in the cheetah species. Captive births at
the De Wildt Cheetah Breeding and Research Centre in
South Africa have established unequivocally that the
king cheetah is merely a variant form of the common
cheetah. Pedigree analysis has shown the king coat pattern
is controlled by a single gene occurring in recessive
form.
|
Anonymous_1989_King_Cheetahs_are_Tabbies.pdf
|
|
Angier,
N. 1992. Cheetahs appear vigorous despite
inbreeding. New York Times , B5-B8. 10-11-1992.
|
Genetic studies during the
1980s concluded that the cheetah had suffered a population crash 10'000 years
ago, where they lost more than 90% of their genetic variation. The now low
genetic variability was thought to be responsible for the low breeding success,
also in captivity. A recent study calls into question the validity of taking a
strictly molecular approach to the sometimes murky science of species
preservation, and it strongly suggests that scientists do not yet know enough
about how certain genetic patterns detected in laboratory tests translate into
the strengths and weaknesses of a wild animals. Scientists at the Centre for
the Reproduction of Endangered Species at the Zoological Society of San Diego
say that those zoos that have trouble propagating cheetahs in captivity should
not blame the animal's DNA, but rather their onw inaptitue at animal husbandry
and matchmaking.
|
Angier_1992_Cheetahs_appear_vigorous_despite_inbreeding.pdf
|
|
Busby
G.,
Gottelli D., Wacher T., Durant S., Marker L., Belbachir
F.,
De Smet K., Belbachir-Bazi A., Fellous A. and Belghoul,M.
2006.
A report from the Sahelo Saharan Interest Group
- Parc National de L'Ahaggar survey, Algeria (March
2005), Part 5: Using molecular genetics to study
the presence of endangered carnivores (November 2006).
Report, 19 pp.
|
A
joint 2005 expedition to the Ahaggar region of the Algerian
Sahara collected over 40 putative carnivore scat samples
for further analysis. The first major objective of this
analysis was to assign species identity to the scat.
This was done through genetic analyses of the samples.
Among other carnivores, eight cheetahs and a leopard
were found.
|
Busby_et_al_2006_Molecular_genetics_of_cheetahs_in_Algeria.pdf
|
|
Busby GBJ, Gottelli D, Wacher T, Marker L,
Belbachir F, de Smet K, Belbachir-Bazi A, Fellous A, Belghoul M, Durant SM.
2009. Genetic analysis of scat reveals leopard Panthera pardus and
cheetah Acinonyx jubatus in
southern Algeria. Oryx 43, 412-415. |
A
joint 2005 expedition to the Ahaggar region of the Algerian
Sahara collected over 40 putative carnivore scat samples
for further analysis. The first major objective of this
analysis was to assign species identity to the scat.
This was done through genetic analyses of the samples.
Among other carnivores, eight cheetahs and a leopard
were found.
|
Busby_et_al_2006_Molecular_genetics_of_cheetahs_in_Algeria.pdf
|
|
Caro TM. 1996. An elegant
enigma - The cheetah is socially and genetically unique among all the cats.
Wildlife Conservation May/June 1996, 44-47. |
The unique sociality and
genetic characteristics of the cheetah are described. The author points out
that predation, rather than genetics seems to be responsible for the low
population density in the wild and that more cubs die of poor husbandry and
maternal neglect in zoos, than from genetic deformities as conservation
genetics would predict. |
Caro_1996_An_elegant_enigma.pdf
|
|
Caro TM, Durant SM. 1991. Use of
quantitative analyses of pelage characteristics to reveal family resemblances
in genetically monomorphic cheetahs. Journal of Heredity 82, 8-14.
|
African cheetahs (Acinonyx
jubatus) have extremely low lewels of biochemical genetic variation relative to
other felids as measured by enzyme electrophoresis, suggesting that
interfamilial differences in phenotypic traits may be slight. Quantitative data
on the pattern on tail bands collected from both sides of the tails of 64
free-living cheetahs show, however, that individuals differ markedly from each other
and that siblings resemble each other significantly more than do nonsiblings.
Furthermore, offspring tail bands show significantly less similarity to tail
bands of their mothers than they do to their siblings. |
Caro_&_Durant_1991_Family_resemblances_in_cheetahs.pdf
|
|
Cohn JP. 1986. Surprising
cheetah genetics - An in-depth study of genes form wild and captive cheetahs is
leading to new conservation strategies as well as questions and controversy.
BioScience 36, 358-362. |
A magazine article reporting
on a genetic study of wild and captive cheetahs that elucidate the
abnormalities found on sperm sample, high infant mortality, weakness to illness
and homogeneous histocompatibility complex. Causes of genetic invariability,
questions and controversy are also presented, as well as a species survival
plan foreseeing the publish of handbooks on breeding and managing techniques,
and standardized laboratory tests. |
Cohn_1986_Surprising_cheetah_genetics.pdf
|
|
Cohn JP. 1990. Genetics for
wildlife conservation. BioScience 40, 167-171. |
A review of the increasing
interest in genetics for wildlife conservation is given. DNA analysis is
helping to resolve taxonomic issues, explain reproductive problems, asses the
risk of disease epidemics , and suggest conservation strategies. |
Cohn_1990_Genetics_for_wildlife_conservation.pdf
|
|
Charruau
et al. 2011. Phylogeography,
genetic structure and population divergence time of
cheetahs in Africa and Asia: evidence for long-term
geographic isolates. Molecular Ecology 20, 706-724.
|
The cheetah (Acinonyx
jubatus) has been described as a species with low levels
of genetic variation. This has been suggested to be
the consequence of a demographic bottleneck 10 000-12
000 years ago (ya) and also led to the assumption that
only small genetic differences exist between the described
subspecies. However, analysing mitochondrial DNA and
microsatellites in cheetah samples from most of the
historic range of the species we found relatively deep
phylogeographic breaks between some of the investigated
populations, and most of the methods assessed divergence
time estimates predating the postulated bottleneck.
Mitochondrial DNA monophyly and overall levels of genetic
differentiation support the distinctiveness of Northern-East
African cheetahs (Acinonyx jubatus soemmeringii). Moreover,
combining archaeozoological and contemporary samples,
we show that Asiatic cheetahs (Acinonyx jubatus venaticus)
are unambiguously separated from African subspecies.
Divergence time estimates from mitochondrial and nuclear
data place the split between Asiatic and Southern African
cheetahs (Acinonyx jubatus jubatus) at 32 000-67 000
ya using an average mammalian microsatellite mutation
rate and at 4700-44 000 ya employing human microsatellite
mutation rates. Cheetahs are vulnerable to extinction
globally and critically endangered in their Asiatic
range, where the last 70-110 individuals survive only
in Iran. We demonstrate that these extant Iranian cheetahs
are an autochthonous monophyletic population and the
last representatives of the Asiatic subspecies A. j.
venaticus. We advocate that conservation strategies
should consider the uncovered independent evolutionary
histories of Asiatic and African cheetahs, as well as
among some African subspecies. This would facilitate
the dual conservation priorities of maintaining locally
adapted ecotypes and genetic diversity.
|
Charruau_et_al_2011_Genetic_differences_in_cheetahs_from_Africa_and_Asia.pdf
|
|
Freeman AR, Machugh DE,
McKeown S, Walzer C, McConnell DJ, Bradley DG. 2001. Sequence variation in the
mitochondrial DNA control region of wild African cheetahs (Acinonyx jubatus).
Heredity 86, 355-362.
|
Five hundred and twenty-five bp of mitochondrial control region
were sequenced and analyzed for 20 Acinonyx jubatus and one Felis
catus. These sequences were compared with published sequences from another
domestic cat, 20 ocelots (Leopardus pardalis) and 11 margays (Leopardus
weidii). The intraspecific population divergence in cheetahs was found to
be less than in the other cats. However, variation was present and distinct
groups of cheetahs were discernible. The 80 bp RS2 repetitive sequence motif
previously described in other felids was found in four copies in cheetah. The
repeat units probably have the ability to form secondary structure and may have
some function in the regulation of control region replication. The two central
repeat units in cheetah show homogenization that may have arisen by convergent
evolution.
|
Freeman_et_al_2001_Genetic_variation_in_wild_cheetahs.pdf
|
|
Gottelli D, Wang J, Bashir S,
Durant SM. 2007. Genetic analysis reveals promiscuity among female cheetahs.
Proc R Soc B, 1-9. |
During
a five months stay in Namibia, we helped with the completion
of CCF's education centre consisting of the History
of the Cheetah, Biology of the Cheetah, Ecology of Namibia's
Cheetah Habitat; and the Future of the Cheetah.
|
Gottelli_et_al_2007_Promiscuity_among_cheetah_females.pdf
|
|
Hedrick PW. 1987. Genetic
bottleneck. Science 237(28 August 1987),
963.
|
The article by R. Lewin about genetic bottlenecks in house flies
and supposed genetic bottlenecks in cheetahs may be misleading, particularly
when applied to conservation genetics. It appears that captive conditions also
contribute to poor breeding quality in cheetahs. Caution is the best approach
when interpreting research results for application to conservation genetics.
|
Hedrick_1987_Genetic_bottleneck.pdf
|
|
Hedrick PW. 1996.
Bottleneck(s) or metapopulation in cheetahs. Conservation Biology 10(3):897-9.
|
The "cheetah
paradigm" proposes that a low level of genetic variation has resulted in a
high probability of extinction for this species, a connection that has recently
been questioned. I do not wish to address this controversy further but to
suggest that the extent of genetic variation observed in cheetahs, including
the recent minisatellite and microsatellite data, is consistent with the
equilibrium heterozygosity expected from the small effective population size
that may occur because of
metapopulation dynamics, that is, because of extinction and re-colonization
of habitat patches. In other words, a severe, ancient population bottleneck or
a series of ancient bottlenecks "over time, over space or both, with small
populations being founded and surviving, while the larger parent populations
died out" at the end of Pleistocene (10,000 to 12,000 years ago) are not
the only explanations for the observed pattern of genetic variation in
cheetahs. Alternative possibilities are presented.
|
Hedrick_1996_Bottleneck(s)_or_metapopulation_in_cheetahs.pdf
|
|
Hedrick PW, Lacy RC, Allendorf
FW, Soulé ME. 1996. Directions in Conservation Biology: Comments on Caughley.
Conservation Biology 10(5):1312-20.
|
The recent review by Caughley
(1994) on approaches used in conservation biology suggested that there are two:
the small population paradigm and the declining population paradigm. We believe
that this division is overly simplistic and that it should not be perpetuated.
Both the deterministic factors that reduce population size and the stochastic
factors that lead to the final extinction of a small population are critical to
consider in preventing extinction. Only through an overall and comprehensive
effort, which we call inclusive population viability analysis, can
extinction processes be understood and
mitigated. In this context we discuss Caughley's comments about genetics,
demography, and general population viability, with particular attention to
cheetahs (Acinonyx jubatus) and Pacific salmon (Oncorhynchus
sp.).
|
Hedrick_et_al_1996_Directions_in_Conservation_Biology.pdf
|
|
Kat PW. 1993. Genetics of the cheetah: What we know
and how we should use this knowledge. Swara
16:13.
|
The number of people the
author met that are conversant with the genetics of cheetahs is amazing. The
wisdom of programmes that propose to curve a variety of ills merely by
increasing genetic variation, however, are unconvincing, and have largely
resulted from a lack of understanding of complexities involved.
|
Kat_1993_Genetics_of_the_cheetah.pdf
|
|
Kelly MJ. 2001. Lineage loss
in Serengeti cheetahs: consequences of high reproductive variance and
heritability of fitness on effective population size. Conservation Biology
15(1):137-47.
|
In natural populations, many breeders do not leave surviving
offspring, and as a result many potential genetic lineages are lost. I examined
lineage extinction in Serengeti cheetahs (Acinonyx jubatus) and found
that 76% of matrilines were lost over a 25-year period. Production of future
breeders was nonrandom and generally confined to a few families. Five out of 63
matrilines accounted for 45% of the total cheetah population over the course of
the study. Lineage persistence is perhaps best illustrated by the variance in
lifetime reproductive success (LRS) and heritability in this parameter. In
female cheetahs, variance in LRS was high, and new data show that this LRS was
heritable. Variance in LRS and heritability in LRS have dramatic consequences
for effective population size, Ne. I calculated Ne
for cheetahs, taking into account fluctuating population size, unequal sex
ratio, non-Poisson distribution of reproductive success, and heritability of
fitness. The Ne was most strongly affected by variance in
reproductive success and especially heritability in reproductive success. The
variance Ne was 44% of the actual population size, and the
inclusion of heritability further reduced Ne to only 15% of
the actual population, a ratio similar to that of a social carnivore with
reproductive suppression. The current cheetah population in the Serengeti is
below numbers suggested by Ne estimates as sufficient to
maintain sufficient genetic diversity.
|
Kelly_2001_Lineage_loss_in_Serengeti_Cheetahs.pdf
|
|
Kotze A, Ehlers K, Cilliers
DC, Grobler JP. 2008. The power of resolution of microsatellite
markers and assignment tests to determine the geographic origin
of cheetah (Acinonyx jubatus) in Southern Africa.
Mammalian Biology 73, 457-562.
|
Formerly found in 44 countries
in Africa and Asia, cheetahs are currently confined to fragmented
populations in 29 African countries, and remnant populations
in Iran and Pakistan (Marker 2002). In southern Africa, cheetahs
are at present found in Botswana, Namibia, South Africa and
Zimbabwe. Trade in cheetah products and live export of cheetah
from Namibia and Botswana is stringently controlled (CITES 1992).
As a result, conservation authorities are constantly aware of
potential illegal trade in cheetah over the Namibian and Botswana
borders with South Africa. Where foul-play is involved, identification
of source populations of confiscated animals will require implementation
of identification techniques based on multilocus genotypes.
Manel et al. (2002) demonstrated that genetic methods have high
power of resolution to determine the geographic origin of population
samples for sufficiently differentiated populations. Forensic
science services for domesticated animals are well established
in South Africa and have in recent years expanded to include
game species, marine fish stock identification and ornamental
fish (Grobler et al. 2005). In this paper, we describe the power
of resolution of microsatellite markers and assignment tests
to determine the geographic origin of cheetah (Acinonyx jubatus)
confiscated in South Africa on suspicion of illegal import.
Cheetah was formerly thought to be genetically highly monomorphic
(presumably following a historic bottleneck), based on allozyme
data (O'Brien et al. 1983). Subsequent studies (Menotti-Raymond
and O'Brien 1993, 1995) have revealed genetic heterogeneity
for microsatellite markers. This has been attributed to accumulated
variation since the hypothetical bottleneck, resultant from
the high mutation rates of microsatellite markers (Hedrick 1996).
The presence of a moderate level of genetic diversity, comparable
to other felids for some markers (Menotti-Raymond and O'Brien
1993), suggests that marker-based forensic identification in
cheetah is feasible.
|
Kotze_et_al_2008_Genetic_determination_of_cheetah_origin_in_southern_Africa.pdf
|
|
Langley RJ, Hirsch VM, O'Brien SJ, Adger-Johnson D,
Goeken RM, Olmsted RA. 1994. Nucleotide sequence analysis of puma lentivirus
(PLV-14): Genomic organization and relationship to other lentiviruses. Virology
202: 853-64.
|
The complete nucleotide sequence of an isolate of
puma lentivirus (PLV-14) was obtained by an inverse polymerase chain reaction
(I-PCR) technique and confirmed by conventional PCR. Both methods were used to
amplify overlapping regions of proviral DNA, for cloning and sequencing, from
genomic DNA isolated from PLV-14 infected Florida puma (Felis concolor coryi)
peripheral blood mononuclear cells (PBMC). The provirus has a total length of
9100 nucleotides and the genomic organization of presumed protein coding
regions are similar to those seen in other members of the lentivirus family,
i.e., three large open reading frames gag, pol, and env as well as smaller
intergenic regions that apparently encode regulatory proteins vif and 3' rev by
positional and sequence similarity to those seen in other lentiviruses. Two
additional open reading frames were identified in the env region and their
function (if any) is unknown. The length of the PLV-14 long terminal repeat
(LTR) was found to be shorter than the LTRs of feline immunodeficiency virus
(FIV). The sequence homology between PLV-14 and other lentiviruses demonstrates
that PLV-14 is most closely related to FIV from domestic cats. However, the
extent of sequence divergence of each retroviral gene segment is large (e.g.,
percentage sequence similarity between FIV and PLV-14 env is 8% amino acid and
37% nucleotide similarity), indicating relatively ancient divergence of these
feline lentiviral genomes.The complete nucleotide sequence of an isolate of
puma lentivirus (PLV-14) was obtained by an inverse polymerase chain reaction
(I-PCR) technique and confirmed by conventional PCR.
|
Langley_et_al_1994_Puma_lentivirus_sequence.pdf
|
|
Laurenson MK, Caro TM, Gros
PM, Wielebnowski N. 1995. Controversial cheetahs? Nature 377(5.October
1995):392.
|
May has discussed some of
recent reappraisals of O'Brien and colleagues' evidence that the cheetah's
generic impoverishment is threatening the species' persistence. Some comments,
however, particularly those of O'Brien, may be misleading, according to the
author's opinion. Particularly, are discussed the causes of cub mortality and
the thesis of the vulnerability of the cheetah to pathogens, pointing out that
intrinsic source of mortality are apparently insignificant compared with
extrinsic source, both in the wild and in captivity. Ecology can be as
important as genetics, and interdisciplinary cooperation in conservation problems
is essential.
|
Laurenson_et_al_1995_Controversial_cheetahs.pdf
|
|
Marker-Kraus L.
Focus on the Cheetah: Technical innovations in
species conservation Washington D.C.: NOAHS; 19 pp.
|
A recently drafted Master Plan
developed by the cheetah propagation group of the Species Survival Plan of the
American Association of Zoological Parks and Aquarium has listed basic research
in reproduction as a primary end of the SSP. This research is to be conducted
by NOAHS Center scientists and will include: (1) fundamental studies of the
reproductive physiology, and endocrinology of the species; (2) assessing,
understanding and combating infertility; (3) germ plasm storage of sperm, and
embryos for conservation and biodiversity; and (4) artificial breeding
strategies including in vitro fertilization and artificial insemination.
Considering the combined results of the genetics, physiology, structure and
natural history of the captive population of the cheetah there are several
recommendations that are important to improve the demographic pattern: First,
the outbreeding of individuals within the captive population, second, the
increasing of the breeding population's size and finally, the continually
increasing of the research on captive and free-ranging cheetahs.
|
Marker-Kraus_-_Focus_on_cheetah_-_Technical_innovations.pdf
|
|
Marker LL, Pearks Wilkerson
AJ, Sarno RJ, Martenson J, Breitenmoser-Würsten Ch, O'Brien
SJ, Johnson WE. 2008. Molecular genetics insights on cheetah
(Acinonyx jubatus) ecology and conservationn in Namibia.
Journal of Heredity 99(1):2-13.
|
The extent and geographic patterns
of molecular genetic diversity of the largest remaining free-ranging
cheetah population were described in a survey of 313 individuals
from throughout Namibia. Levels of relatedness, including paternity/maternity
(parentage), were assessed across all individuals using 19 polymorphic
microsatellite loci, and unrelated cheetahs (n = 89) from 7
regions were genotyped at 38 loci to document broad geographical
patterns. There was limited differentiation among regions, evidence
that this is a generally panmictic population. Measures of genetic
variation were similar among all regions and were comparable
with Eastern African cheetah populations. Parentage analyses
confirmed several observations based on field studies, including
21 of 23 previously hypothesized family groups, 40 probable
parent/offspring pairs, and 8 sibling groups. These results
also verified the successful integration and reproduction of
several cheetahs following natural dispersal or translocation.
Animals within social groups (family groups, male coalitions,
or sibling groups) were generally related. Within the main study
area, radio-collared female cheetahs were more closely interrelated
than similarly compared males, a pattern consistent with greater
male dispersal. The long-term maintenance of current patterns
of genetic variation in Namibia depends on retaining habitat
characteristics that promote natural dispersal and gene flow
of cheetahs.
|
Marker_et_al_2008_Genetic_insight_on_cheetah_in_Namibia.pdf
|
|
May RM. 1995. The cheetah
controversy. Nature 374:309-10.
|
In 1983, O'Brien et al.
announced that cheetahs have remarkably little genetic variability. However,
independent researchers, Caughley and Merola, studying 24 other carnivores,
argued that cheetahs are not especially impoverished and deny that there is
much evidence of any deleterious effects in the form of inbreeding depression.
Current thinking may rightly recognize that lack of genetic diversity is not
the primary factor for most endangered species. But O'Brien's concern
nevertheless remains an important consideration for many conservation
programmes, and particularly for cheetahs.
|
May_1995_The_cheetah_controversy.pdf
|
|
Menotti-Raymond M, O'Brien SJ. 1993. Dating the genetic bottleneck of the African cheetah. Proc Natl Acad Sci
USA 90:3172-6.
|
The cheetah (Acinonyx
jubatus) is unusual among felids in exhibiting near genetic uniformity at a
variety of loci previously screened to measure population genetic diversity. It
has been hypothesized that a demographic crash or population bottleneck in the
recent history of the species is causal to the observed monomorphic profiles
for nuclear coding loci. The timing of a bottleneck is difficult to assess, but
certain aspects of the cheetah's natural history suggest it may have occurred
near the end of the last ice age (late Pleistocene, approximately 10,000 years
ago), when a remarkable extinction of large vertebrates occurred on several
continents. To further define the timing of such a bottleneck, the character of
genetic diversity for two rapidly evolving DNA sequences, mitochondrial DNA and
hypervariable minisatellite loci, was examined. Moderate levels of genetic
diversity were observed for both of these indices in surveys of two cheetah
subspecies, one from South Africa and one from East Africa. Back calculation
from the extent of accumulation of DNA diversity based on observed mutation
rates for VNTR (variable number of tandem repeats) loci and mitochondrial DNA
supports a hypothesis of an ancient Pleistocene bottleneck that rendered the
cheetah depauperate in genetic variation for nuclear coding loci but would
allow sufficient time for partial reconstitution of more rapidly evolving
genomic DNA segments.
|
Menotti-Raymond_&_OBrien_1993_Genetic_bottleneck_of_the_African_cheetah.pdf
|
|
Menotti-Raymond M, O'Brien SJ. 1995. Hypervariable genomic variation to reconstruct the natural history of
populations: Lessons from the big cats. Electrophoresis 16:1771-4.
|
The extent and nature of
variation in hypervariable regions of DNA have been used in the past as a means
to infer the natural histories of populations. We review the interpretation of
the extent of genetic diversity for minisatellite DNA in the cheetah to
estimate the timing of a population bottleneck in the species and the potential
application of a second class of hypervariable DNA, microsatellite DNA, as a
molecular tool to examine the natural histories of felid populations. A calibration
curve relating the degree of allele fragment sharing in individuals to
relatedness in a captive pedigree of cheetahs is presented. This measurement
has important applications for management of potential matings in captive
management situations.
|
Menotti-Raymond_&_OBrien_1995_Feline_DNA_fingerprinting.pdf
|
|
Menotti-Raymond M, O'Brien SJ. 1995. Evolutionary conservation of ten microsatellite loci in four species of
Felidae. Journal of Heredity 86(4):319-22.
|
Short tandem repeat polymorphismus (STRP), or microsatellites, are
widespread among vertebrate genomes and are useful in gene mapping and population
studies due to their high level of length polymorphism. The authors describe
the isolation, characterisation, and PCR amplification of 10 microsatellite
loci from the domestic cat, Felis catus. The flanking primer sequences were
conserved among other Felidae species, and amplification products demonstrated
abundant polymorphism in puma, lion, cheetah, and domestic cat. The cheetah
sample exhibited the lowest level of polymorphism for these loci among felid
species.
|
Menotti-Raymond_&_OBrien_1995_Microsatellite_loci_in_felids.pdf
|
|
Mills LS. 1996. Cheetah
extinction: Genetics or extrinsic factors? Conservation Biology 10(2):315.
|
In this article letter the author gives his opinion about the
debate addressed by Laurenson et al over the cheetah conservation strategy, on the Conservation
Biology journal of 1996. He did not take a position in favour of genetic or
extrinsic factors, on the contrary he pointed out that a view toward
interactions between genetics and environmental, behavioural, and demographic
factors would move us further toward helping small and isolated populations.
|
Mills_1996_Cheetah_extinction_by_genetic_or_extrinsic_factors.pdf
|
|
Mishra MK. 1996.
Re-introduction of "cheetah" into the wild in India - is there a
case? Zoo's Print Ten Years(January 1996):11-2.
|
To see the cheetah back into the Indian wilds has been
a fond hope and dream with many an Indian wildlifer and conservationist.
Cheetah is the only large mammal of India to have gone extinct within
historical times. According to the Journal of the Bombay Natural History
Society, it was only in 1947 that the last cheetah was shot in the Ramgarh area
of north-east Madhya Pradesh. During the seventies and eighties of the 20th
century a serious attempt was made by the Government
of India, to procure some numbers of cheetahs from
the relict free-ranging population in Iran. the
scheme, for some reasons, failed to materialize,
but does there exist a case for yet another attempt
now?
|
Mishra_1996_Cheetah_re-introduction_in_India.pdf
|
|
O'Brien SJ. 1991. The genetic
peril of the cheetah. In Seidensticker J, Lumpkin S.
(eds). Great Cats:
Majestic Creatures of the Wild. Sydney: Weldon Owen; pp. 146-147.
|
The cheetah is descended from a handful of survivors of a global
extinction that occurred at the end of the last Ice Age, more than 10'000 years
ago. They have 10-100 times less variation in their intrinsic genetic material.
The species as a whole is suffering from the effects of what we call inbreeding
depression. This causes an increase in the incidence of two unhealthy genes in
the same individual. This causes the entire species to be susceptible to
infectious disease agents, viruses or pathogens, which periodically evolve. But
the cheetah has survived and even increased to tens of thousands since its
ancestors passed through the ancient population bottleneck. The cheetah's future
may be in our hands. The only long-term prospects for survival are in areas
with effective protection against shooting, hunting and also high densities of
predators.
|
OBrien_1991_The_genetic_peril_of_the_cheetah.pdf
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O'Brien SJ, Goldman D, Merril CR, Bush ME. 1983.
The cheetah is depauperate in genetic variation. Science 221,
459-462. |
A sample of 55 South African cheetahs (Acinonyx
jubatus jubatus) from two geographically isolated populations in South
Africa were found to be genetically monomorphic at each of 47 allozyme (allelic
isozyme) loci. Two-dimensional gel electrophoresis of about 155 abundant
soluble proteins from cheetah fibroblasts also revealed a low frequency of
polymorphism (average heterozygosity, 0.013). Both estimates are dramatically
lower than levels of variation reported in other cats and mammals in general.
The extreme monomorphism may be a consequence of a demographic contraction of
the cheetah (a population bottleneck) in association with a reduced rate of
increase in the recent natural history of this endangered species. |
OBrien_1983_Cheetah_is_depauperate_in_genetic_variation.pdf
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O'Brien SJ. 1994. The
cheetah's conservation controversy. Conservation Biology 8,
1153-1155.
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In 1994 Merola reviewed the results that have been collected over
the last decade relative to the population genetic structure of the African
cheetah and the implications for survival. Synthesizing the data in a critical
manner, this work brought into question the relevance of previous observations
that the cheetah has a remarkably reduced complement of genomic variation and
is suffering a physiological fitness cost as a consequence. To respond to these
criticisms O'Brien discusses in this article the major points of disagreement.
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OBrien_1994_Cheetah_conservation_controversy.pdf
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O'Brien SJ. 1994. A role for
molecular genetics in biological conservation. Proceedings of the National
Academy of Sciences of the United States of America 91, 5748-5755.
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The recognition of recent
accelerated depletion of species as a consequence of human industrial
development has spawned a wide interest in identifying threats to endangered
species. In addition to ecological and demographic perils, it has become clear
that small populations that narrowly survive demographic contraction may
undergo close inbreeding genetic drift, and loss of overall genomic variation
due to allelic loss or reduction to homozygosity. I review here the
consequences of such genetic depletion revealed by applying molecular
population genetic analysis to four endangered mammals: African cheetah, lion,
Florida panther, and humpback whale. The accumulated genetic results, combined
with physiological, ecological, and ethological data, provide a multifaceted
perspective of the process of species diminution. An emerging role of
population genetics, phylogenetics, and phylogeography as indicators of a
population's natural history and its future prognosis provides valuable data of
use in the development of conservation management plans for endangered species.
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OBrien_1994_A_role_for_molecular_genetics_in_conservation.pdf
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O'Brien SJ. 1994. Genetic and
phylogenetic analyses of endangered species. Annual Review of Genetics 28:467-89.
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Several reviews have chronicled the application of genetic
principles to conservation management and summarized the state of genetic data
on the few studied species. The goal here is to review some lessons learned by
applying empirical population genetic approaches to define the factors that
imperil fragile populations. Both the limitations of the inference and the
conclusions reached as a community of conservation scientists are summarized.
Several examples will illustrate the synthesis of genetic interpretation with
demographic, ecological, and life-history data to draw a cohesive picture of
the threatened taxon. Most of the examples are endangered large charismatic
carnivore species selected for two reasons. First, large carnivore species
occupy the top position of a trophic chain for their ecosystem. They are often
highly specialized and provide a sensitive barometer of an ecosystem's
condition. Second, charismatic species attract long-term field studies that lay
the groundwork for formulating falsifiable ecological and life-history
hypotheses. On of the presented examples is the cheetah.
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OBrien_1994_Genetic_and_phylogenetic_analyses_of_endangered_species.pdf
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Sanjayan MA, Crooks KR. 1996.
Skin grafts and cheetahs. Nature 381.
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Since the publication of the landmark study by O'Brien et al.
on the lack of genetic variation in cheetahs, a flurry of reports have
questioned this work. This skepticism is due, in part, to the acceptance of
reciprocal skin grafts between unrelated cheetahs reported by O'Brien et al.,
a phenomenon not previously observed in wild mammals. We performed skin-graft
experiments in Thomomys bottae, the pocket gopher, in order to repeat
this test on an other wild species. Our results indicate that individuals from
populations with low levels of genetic variation can have similar major
histocompatibility complex (MHC) genotypes, and we believe that the earlier
cheetah results, because of their concordance with our work, were real
phenomena.
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Sanjayan_&_Crooks_1996_Skin_grafts_and_cheetahs.pdf
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Sullivan W. 1983. Rare
genetic uniformity found in cheetahs. New York Times,
24 July 1983.
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In the New York Times of July
1983, the author mentions the rare genetic uniformity found in cheetahs, the
bottleneck theory as the cause of this impoverishment, the problems with
reproduction and man hunting, and its endangered status.
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Sullivan_1983_Rare_genetic_uniformity_in_cheetahs.pdf
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Wielebnowski N. 1996.
Reassessing the relationship between juvenile mortality and genetic
monomorphorism in captive cheetahs. Zoo Biology 15,
353-369.
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Low levels of genetic
heterozygosity are commonly considered a major threat to the survival of wild
and captive populations. However, intense focus on genetic issues may obscure
the importance of extrinsic factors influencing species' survival in wild and
captive environments. A key example for this is the cheetah (Acinonyx
jubatus), which is frequently cited as suffering from unusually high
juvenile mortality and decreased fecundity in captivity due to genetic
monomorphism at the species level. It has also been suggested that as a
consequence of such extreme homozygosity, juvenile mortality rates of young
from related vs. unrelated parents would not be expected to differ
significantly. However, examination of current studbook data and breeding
records of the North American captive population showed that juvenile mortality
of young from related parents was significantly higher than that of young from
unrelated parents, largely as a result of intrinsic causes, such as stillbirths
and congenital defects, that may have a genetic basis. This indicates that in
spite of the cheetah's homozygosity, effects of further inbreeding depression
may still occur in the captive population, and deleterious recessive alleles
are being segregated. Furthermore, juvenile mortality has declined over time
and differs significantly among facilities, even when only young from unrelated
parents are considered, suggesting that differences in management practices may
be largely responsible for observed changes in mortality rate. Contrary to
previous reports, cheetah juvenile mortality is not unusually high when
compared to other captive-bred felids. In addition, cheetahs were found to have
consistently higher litter sizes and the highest average number of surviving cubs
per litter when compared to other captive-bred felid species. These findings
cast doubt on the significance of overall homozygosity in this species for its
juvenile survival and breeding performance and emphasize the key role of
management practice in promoting breeding of endangered species.
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Wielebnowski_1996_Juvenile_Mortality_in_Captive_Cheetahs.pdf
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Yuhki N, O'Brien SJ. 1990. DNA
variation of the mammalian major histocompability complex reflects genomic
diversity and population history. Proc Natl Acad Sci USA 87, 836-840.
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The major histocompatibility complex (MHC) is a
multigene complex of tightly linked homologous genes that encode cell surface
antigens that play a key role in immune regulation and response to foreign
antigens. In most species, MHC gene products display extreme antigenic
polymorphism, and their variability has been interpreted to reflect an adaptive
strategy for accommodating rapidly evolving infectious agents that periodically
afflict natural populations. Determination of the extent of MHC variation has
been limited to populations in which skin grafting is feasible or for which
serological reagents have been developed. We present here a quantitative
analysis of restriction fragment length polymorphism of MHC class I genes in
several mammalian species (cats, rodents, humans) known to have very different
levels of genetic diversity based on functional MHC assays and on allozyme
surveys. When homologous class I probes were employed, a notable concordance
was observed between the extent of MIC restriction fragment variation and
functional MHC variation detected by skin grafts or genome-wide diversity
estimated by allozyme screens. These results confirm the genetically
depauperate character of the African cheetah, Acinonyx jubatus, and the
Asiatic lion, Panthera leo persica; further, they support the use of
class I MHC molecular reagents in estimating the extent and character of
genetic diversity in natural populations.
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Yuhki_&_OBrien_1990_DNA_variation_reflects_genomic_diversity_and_population_history.pdf
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