Minimum population size, genetic diversity, and social structure of the Asian elephant in Cat Tien National Park and its adjoining areas, Vietnam, based on molecular genetic analyses

2007 ◽  
Vol 8 (6) ◽  
pp. 1471-1478 ◽  
Author(s):  
T. N. C. Vidya ◽  
Surendra Varma ◽  
Nguyen X. Dang ◽  
T. Van Thanh ◽  
R. Sukumar
Keyword(s):  
Genetic Diversity ◽  
Social Structure ◽  
Population Size ◽  
National Park ◽  
Molecular Genetic ◽  
Asian Elephant ◽  
Genetic Analyses ◽  
Cat Tien National Park

scholarly journals Social structure and demography of a remnant Asian elephant Elephas maximus population and the implications for survival

Oryx ◽  
2020 ◽  
pp. 1-6
Author(s):  
Lauren J. Hale ◽  
Kun Shi ◽  
Tania C. Gilbert ◽  
Kelvin S.-H. Peh ◽  
Philip Riordan
Keyword(s):  
Social Structure ◽  
Population Size ◽  
Total Population ◽  
Camera Traps ◽  
Asian Elephant ◽  
Elephas Maximus ◽  
Effective Density ◽  
Anthropogenic Pressures ◽  
Sex Ratio Bias ◽  
Elephant Population

Abstract The Asian elephant Elephas maximus is at risk of extinction as a result of anthropogenic pressures, and remaining populations are often small and fragmented remnants, occupying a fraction of the species' former range. Once widely distributed across China, only a maximum of 245 elephants are estimated to survive across seven small populations. We assessed the Asian elephant population in Nangunhe National Nature Reserve in Lincang Prefecture, China, using camera traps during May–July 2017, to estimate the population size and structure of this genetically important population. Although detection probability was low (0.31), we estimated a total population size of c. 20 individuals, and an effective density of 0.39 elephants per km2. Social structure indicated a strong sex ratio bias towards females, with only one adult male detected within the population. Most of the elephants associated as one herd but three adult females remained separate from the herd throughout the trapping period. These results highlight the fragility of remnant elephant populations such as Nangunhe and we suggest options such as a managed metapopulation approach for their continued survival in China and more widely.

Estimating population size and genetic diversity of Asian elephant in the Shangyong Nature Reserve

2015 ◽  
Vol 23 (2) ◽  
pp. 202-209
Author(s):  
Changhuan He ◽  
◽  
Yu Zhou ◽  
Lifan Wang ◽  
Li Zhang
Keyword(s):  
Genetic Diversity ◽  
Population Size ◽  
Nature Reserve ◽  
Asian Elephant

Noninvasive genetic analyses for estimating population size and genetic diversity of the remaining Far Eastern leopard (Panthera pardus orientalis) population

2013 ◽  
Vol 15 (3) ◽  
pp. 521-532 ◽  
Author(s):  
Taro Sugimoto ◽  
Vladimir V. Aramilev ◽  
Linda L. Kerley ◽  
Junco Nagata ◽  
Dale G. Miquelle ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Size ◽  
Panthera Pardus ◽  
Genetic Analyses ◽  
Panthera Pardus Orientalis ◽  
Far Eastern

Elusive does not always equal rare: genetic assessment of a protected Gila monster (Heloderma suspectum) population in Saguaro National Park, Arizona

2017 ◽  
Vol 38 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Victoria Sophia Farrar ◽  
Taylor Edwards ◽  
Kevin Edward Bonine
Keyword(s):  
Genetic Diversity ◽  
Population Size ◽  
Effective Population Size ◽  
National Parks ◽  
Sonoran Desert ◽  
National Park ◽  
Sequence Data ◽  
Demographic History ◽  
Effective Population ◽  
Heloderma Suspectum

Population genetic baselines for species perceived to be at-risk are crucial for monitoring population trends and making well-informed management decisions. We characterized the genetic status of a population of Gila monsters (Heloderma suspectum), a large venomous lizard native to deserts of the southwestern United States and northern Mexico, by sampling 100 individuals in Sonoran Desert upland habitat at Saguaro National Park, Arizona, USA. We used 18 microsatellite markers, along with 1195 bp of sequence data from the mitochondrial DNA 12S locus, to examine genetic diversity, estimate effective population size, and assess demographic history. Despite suburban development adjacent to the study area, we observed high genetic diversity with uninhibited gene flow within this protected population. We estimated effective population size (Ne) for the total sample area (80 km2) using the linkage disequilibrium method in NeEstimator to be 94 individuals (95% confidence interval: 80.7-111.2). In 2011, we used capture-recapture methods to estimate that 80 adult Gila monsters (95% CI = 37-225) inhabited the area along the 14-km transect that we surveyed most frequently; probability of detecting resident Gila monsters during surveys was <0.01, highlighting the challenges of studying the species. Despite being considered an elusive and thus potentially rare species, these data reveal that in this protected environment the population appears healthy and robust. The results provide an important genetic baseline for future studies and monitoring, and exemplify the success of protective population measures in National Parks and under Arizona state laws.

scholarly journals Genetic Characteristics of Brown Trout Salmo trutta from the Tatra National Park in Poland

2021 ◽  
Vol 21 (10) ◽  
pp. 479-490
Author(s):  
Marcin Kuciński ◽  
Jacek Kozłowski ◽  
Krzysztof Kozłowski ◽  
Piotr Dynowski ◽  
Dorota Fopp-Bayat ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Size ◽  
Brown Trout ◽  
National Park ◽  
Dna Analysis ◽  
Haplotype Diversity ◽  
Global Test ◽  
Genetic Characteristics ◽  
Genetic Diversity And Structure ◽  
Tatra National Park

In the present study the genetic diversity and structure of the brown trout in the Tatra National Park (TNP) was analyzed by application of ten microsatellites and one mitochondrial DNA markers. For this purpose, a total of 96 fish from 7 main streams located on the territory of the TNP were sampled. Examined fish was characterized by a moderate level of the genetic diversity (I=1.196-1.549) and PIC=0.567-0.707). The mean values of observed (Ho) and expected heterozygosity (He) varied from 0,577 to 0,760 and from 0,609 to 0,723, respectively. Based on genetic analysis, five haplotypes were identified, and the computed haplotype diversity (h) and nucleotide diversity (π) values were 0.561 and 0.001, respectively. Assessed genetic differentiation between the examined groups varied from 0.016 do 0.085 and the global test of differentiation (Fst=0.062) among groups provided statistically insignificant values. Constructed Bayesian skyline plot revealed stable population size, however an evidence of a historical decline of the population size in the studied fish was detected. Similarly, to microsatellite DNA analysis, the obtained data on mtDNA analysis showed weak genetic clustering, where two genetic clusters were identified, however, haplotype frequencies did not follow geographical pattern.

Evolutionary genetics of small populations

2017 ◽  
Author(s):  
Richard Frankham ◽  
Jonathan D. Ballou ◽  
Katherine Ralls ◽  
Mark D. B. Eldridge ◽  
Michele R. Dudash ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Size ◽  
Evolutionary Genetics ◽  
Small Population ◽  
Small Populations ◽  
Effective Population ◽  
Genetic Management ◽  
Evolutionary Genetic ◽  
Loss Of Genetic Diversity ◽  
Number Of Individuals

Genetic management of fragmented populations involves the application of evolutionary genetic theory and knowledge to alleviate problems due to inbreeding and loss of genetic diversity in small population fragments. Populations evolve through the effects of mutation, natural selection, chance (genetic drift) and gene flow (migration). Large outbreeding, sexually reproducing populations typically contain substantial genetic diversity, while small populations typically contain reduced levels. Genetic impacts of small population size on inbreeding, loss of genetic diversity and population differentiation are determined by the genetically effective population size, which is usually much smaller than the number of individuals.

scholarly journals Effect of social structure and introduction history on genetic diversity and differentiation

2021 ◽  
Author(s):  
Sylvia M. Flucher ◽  
Patrick Krapf ◽  
Wolfgang Arthofer ◽  
Andrew V. Suarez ◽  
Ross H. Crozier ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Social Structure ◽  
Introduction History
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