Resolving distribution and population fragmentation in two leaf-tailed gecko species of north-east Australia: key steps in the conservation of microendemic species

2018 ◽  
Vol 66 (2) ◽  
pp. 152 ◽  
Author(s):  
Lorenzo V. Bertola ◽  
Megan Higgie ◽  
Conrad J. Hoskin
Keyword(s):  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Mitochondrial Gene ◽  
Isolated Populations ◽  
Distribution Models ◽  
Genetic Structuring ◽  
North East ◽  
Management Actions ◽  
Key Steps

North Queensland harbours many microendemic species. These species are of conservation concern due to their small and fragmented populations, coupled with threats such as fire and climate change. We aimed to resolve the distribution and population genetic structure in two localised Phyllurus leaf-tailed geckos: P. gulbaru and P. amnicola. We conducted field surveys to better resolve distributions, used Species Distribution Models (SDMs) to assess the potential distribution, and then used the SDMs to target further surveys. We also sequenced all populations for a mitochondrial gene to assess population genetic structure. Our surveys found additional small, isolated populations of both species, including significant range extensions. SDMs revealed the climatic and non-climatic variables that best predict the distribution of these species. Targeted surveys based on the SDMs found P. gulbaru at an additional two sites but failed to find either species at other sites, suggesting that we have broadly resolved their distributions. Genetic analysis revealed population genetic structuring in both species, including deeply divergent mitochondrial lineages. Current and potential threats are overlain on these results to determine conservation listings and identify management actions. More broadly, this study highlights how targeted surveys, SDMs, and genetic data can rapidly increase our knowledge of microendemic species, and direct management.

scholarly journals Absence of Population Genetic Structure Among Breeding Colonies of the Waved Albatross

The Condor ◽  
2006 ◽  
Vol 108 (2) ◽  
pp. 440-445 ◽  
Author(s):  
Kathryn P. Huyvaert ◽  
Patricia G. Parker
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Breeding Population ◽  
Genetic Structuring ◽  
Galapagos Archipelago ◽  
Phoebastria Irrorata ◽  
Waved Albatrosses

Abstract We used four variable microsatellite loci to examine the distribution of genetic variation and degree of genetic structuring among three subcolonies of Waved Albatrosses (Phoebastria irrorata). The breeding population of this species is almost entirely limited to the island of Española in the Galápagos Archipelago. Such strong philopatry could lead to population genetic structure among subcolonies on the island. Pairwise values of the FST analog, θ, calculated from microsatellite genotypes, were all less than 0.012, indicating little genetic differentiation and the presence of gene flow throughout the population.

scholarly journals Population genetic structure of Patagonian toothfish (Dissostichus eleginoides) in the Southeast Pacific and Southwest Atlantic Ocean

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4173 ◽  
Author(s):  
Cristian B. Canales-Aguirre ◽  
Sandra Ferrada-Fuentes ◽  
Ricardo Galleguillos ◽  
Fernanda X. Oyarzun ◽  
Cristián E. Hernández
Keyword(s):  
Genetic Structure ◽  
Continental Shelf ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
South American ◽  
The South ◽  
Effective Population ◽  
Genetic Structuring ◽  
South Georgia ◽  
Dissostichus Eleginoides

Previous studies of population genetic structure inDissostichus eleginoideshave shown that oceanographic and geographic discontinuities drive in this species population differentiation. Studies have focused on the genetics ofD.eleginoidesin the Southern Ocean; however, there is little knowledge of their genetic variation along the South American continental shelf. In this study, we used a panel of six microsatellites to test whetherD.eleginoidesshows population genetic structuring in this region. We hypothesized that this species would show zero or very limited genetic structuring due to the habitat continuity along the South American shelf from Peru in the Pacific Ocean to the Falkland Islands in the Atlantic Ocean. We used Bayesian and traditional analyses to evaluate population genetic structure, and we estimated the number of putative migrants and effective population size. Consistent with our predictions, our results showed no significant genetic structuring among populations of the South American continental shelf but supported two significant and well-defined genetic clusters ofD.eleginoidesbetween regions (South American continental shelf and South Georgia clusters). Genetic connectivity between these two clusters was 11.3% of putative migrants from the South American cluster to the South Georgia Island and 0.7% in the opposite direction. Effective population size was higher in locations from the South American continental shelf as compared with the South Georgia Island. Overall, our results support that the continuity of the deep-sea habitat along the continental shelf and the biological features of the study species are plausible drivers of intraspecific population genetic structuring across the distribution ofD.eleginoideson the South American continental shelf.

scholarly journals Microsatellite variation and population genetic structure of a neotropical endangered Bryconinae species Brycon insignis Steindachner, 1877: implications for its conservation and sustainable management

2009 ◽  
Vol 7 (3) ◽  
pp. 395-402 ◽  
Author(s):  
Cristianne Kayoko Matsumoto ◽  
Alexandre Wagner Silva Hilsdorf
Keyword(s):  
Genetic Structure ◽  
Genetic Variability ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Food Resource ◽  
Southeastern Brazil ◽  
Captive Population ◽  
Wild Populations ◽  
Isolated Populations ◽  
Microsatellite Variation

Piabanha (Brycon insignis) is a freshwater fish species from the drainages in Southeastern Brazil. During the 1950s, it was an important economic and food resource for local populations, but dramatic and continuous environmental degradation seriously jeopardized the B. insignis populations in the region. Microsatellite markers were used to assess the genetic structure of wild populations of B. insignis and compare the genetic variability and integrity of the wild populations with a captive population. Samples of DNA from 208 specimens from geographically isolated populations were analyzed. Population genetic structure was investigated using F ST, R ST estimates as well as AMOVA. All five loci used in this study were polymorphic with observed heterozygosity ranging from 0.77 (± 0.15) to 0.88 (± 0.07) in the wild population and 0.90 (± 0.09) in the captive population and the allelic richness average were 7.56 (± 0.27) and 5.80 (± 1.02), respectively. Overall genetic differences were significantly partitioned among populations (F ST = 0.072, p = 0.034). Evidence of a genetic bottleneck was found in some of the wild populations, but especially in the captive population. The results showed that genetic variability still can be found in B. insignis populations which are currently structured possibly due to anthropic actions. The implications of these findings for the management and conservation of B. insignis populations are discussed.

scholarly journals Genome-wide analysis clarifies the population genetic structure of wild gilthead sea bream (Sparus aurata)

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0236230
Author(s):  
Francesco Maroso ◽  
Konstantinos Gkagkavouzis ◽  
Sabina De Innocentiis ◽  
Jasmien Hillen ◽  
Fernanda do Prado ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Gilthead Sea Bream ◽  
Sea Bream ◽  
North East ◽  
Genome Wide ◽  
Distribution Ranges ◽  
In The Wild ◽  
The Mediterranean

Gilthead sea bream is an important target for both recreational and commercial fishing in Europe, where it is also one of the most important cultured fish. Its distribution ranges from the Mediterranean to the African and European coasts of the North-East Atlantic. Until now, the population genetic structure of this species in the wild has largely been studied using microsatellite DNA markers, with minimal genetic differentiation being detected. In this geographically widespread study, 958 wild gilthead sea bream from 23 locations within the Mediterranean Sea and Atlantic Ocean were genotyped at 1159 genome-wide SNP markers by RAD sequencing. Outlier analyses identified 18 loci potentially under selection. Neutral marker analyses identified weak subdivision into three genetic clusters: Atlantic, West, and East Mediterranean. The latter group could be further subdivided into an Ionian/Adriatic and an Aegean group using the outlier markers alone. Seascape analysis suggested that this differentiation was mainly due to difference in salinity, this being also supported by preliminary genomic functional analysis. These results are of fundamental importance for the development of proper management of this species in the wild and are a first step toward the study of the potential genetic impact of the sea bream aquaculture industry.

scholarly journals Population genetic structure in the paddyfield warbler (Acrocephalus agricola Jerd.)

2011 ◽  
Vol 57 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Pavel Zehtindjiev ◽  
Mihaela Ilieva ◽  
Bengt Hansson ◽  
Olga Oparina ◽  
Mihail Oparin ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Bird Species ◽  
Migratory Bird ◽  
Isolated Populations ◽  
Breeding Populations ◽  
Bulgarian Population ◽  
Migratory Strategy ◽  
Degree Of Differentiation

Abstract Population genetic structure was studied in paddyfield warblers Acrocephalus agricola breeding in NE Bulgaria, SE Russia and S Kazakhstan. We were particularly interested in the degree of genetic differentiation and gene flow of the Bulgarian population due to its geographical isolation, recent origin and unique migratory strategy. Analyses of mitochondrial DNA (mtDNA) showed that there was no divergence between Bulgarian and Russian populations (FST = 0.007), whereas those in Kazakhstan differed significantly from the European breeding populations (Russia: FST = 0.058; Bulgaria: FST = 0.114). The degree of differentiation between populations at nuclear markers (five microsatellite loci; FST ≈ 0) was weaker than for mtDNA. We suggest that this relatively weak differentiation over the range of this species reflects a recent postglacial expansion, and results from mismatch distribution analyses and Fu’s FS tests are in agreement. Preservation of small and geographically isolated populations which may contain individuals with unique adaptive traits, such as the studied Bulgarian population of paddyfield warbler, is valuable for the long-term conservation of expanding migratory bird species.

scholarly journals Population genetic structure of the shovel-nosed lobster Thenus unimaculatus (Decapoda, Scyllaridae) in Indian waters based on RAPD and mitochondrial gene sequences

Hydrobiologia ◽  
2015 ◽  
Vol 766 (1) ◽  
pp. 225-236 ◽  
Author(s):  
N. S. Jeena ◽  
A. Gopalakrishnan ◽  
J. K. Kizhakudan ◽  
E. V. Radhakrishnan ◽  
Raj Kumar ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Mitochondrial Gene ◽  
Gene Sequences ◽  
Indian Waters

Population genetic structure and geographic differentiation in butter catfish, Ompok bimaculatus, from Indian waters inferred by cytochrome b mitochondrial gene

2016 ◽  
Vol 28 (3) ◽  
pp. 442-450 ◽  
Author(s):  
Ravindra Kumar ◽  
Brijesh Kumar Pandey ◽  
Uttam Kumar Sarkar ◽  
Naresh Sahebrao Nagpure ◽  
Vishwamitra Singh Baisvar ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Cytochrome B ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Mitochondrial Gene ◽  
Geographic Differentiation ◽  
Indian Waters ◽  
Ompok Bimaculatus
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