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50 results for “genetic diversity distribution”
Fig. 4. Mismatch distribution for mitochondrial haplotypes for 92 in Genetic diversity and population structure of Brycon nattereri (Characiformes: Bryconidae): a Neotropical fish under threat of extinction
Fig. 4. Mismatch distribution for mitochondrial haplotypes for 92 individuals of Brycon nattereri from the Laranjinha River.
Data from: High genetic diversity and stable Pleistocene distributional ranges in the widespread Mexican red oak Quercus castanea Née (1801) (Fagaceae)
<p>The Mexican highlands are areas of high biological complexity where taxa of Nearctic and Neotropical origin and different population histories are found. To gain a more detailed view of the evolution of the biota in these regions, it is necessary to evaluate the effects of historical tectonic and climate events on species. Here, we analyzed the phylogeographic structure, historical demographic processes, and the contemporary period, Last Glacial Maximum (LGM) and Last Interglacial (LIG) ecological niche models of Quercus castanea, to infer the historical population dynamics of this oak distributed in the Mexican highlands. A total of 36 populations of Q. castanea were genotyped with seven chloroplast microsatellite loci in four recognized biogeographic provinces of Mexico: the Sierra Madre Occidental (western mountain range), the Central Plateau, the Trans-Mexican Volcanic Belt (TMVB, mountain range crossing central Mexico from west to east) and the Sierra Madre del Sur (SMS, southern mountain range). We obtained standard statistics of genetic diversity and structure and tested for signals of historical demographic expansions. A total of 90 haplotypes were identified and 29 of these haplotypes were restricted to sngle populations. The within-population genetic diversity was high (mean hS = 0.72), and among-population genetic differentiation showed a strong phylogeographic structure (NST = 0.630 > GST = 0.266; P < 0.001). Signals of demographic expansion were identified in the TMVB and the SMS. The ecological niche models suggested a considerable percentage of stable distribution area for the species during the LGM and connectivity between the TMVB and the SMS. High genetic diversity, strong phylogeographic structure and potential distribution models suggest in situ permanence of Q. castanea populations with large effective population sizes. The complex geological and climatic histories of the TMVB help to explain the origin and maintenance of a large proportion of the genetic diversity in this oak species.</p>
Supplementary material 1 from: Berteloot OH, Kuhn A, Peusens G, Beliën T, Hautier L, Van Leeuwen T, De Clercq P (2024) Distribution and genetic diversity of the invasive pest Halyomorpha halys (Hemiptera, Pentatomidae) in Belgium. NeoBiota 90: 123-138. https://doi.org/10.3897/neobiota.90.113421
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Fig. 1 in Haplotype variation in the Physa acuta group (Basommatophora): genetic diversity and distribution in Serbia Abstract
Fig. 1: Distribution of P. acuta group in Canada, North America, Mexico and Cuba (A), Europe (B) and Serbia (C). Distribution of P. acuta in North and Central America (white circles) was compiled from the data of Wethington et al. (2009), Wethington & Guralnick (2004) and Kraus et al. (2014). The European (white circles) range is based on Wethington & Lydeard (2007), data and distribution in Serbia is based on Novaković (2014, black circles), and on our field sampling data (white circles).
Gradients of genetic diversity and differentiation across the distribution range of a Mediterranean coral: patterns, processes and conservation implications.
<p><span><span><span><span><span><span><span><span><span><span><span>The aim of this study was to determine how historical and contemporary eco-evolutionary processes shape the patterns of genetic diversity and differentiation across species' distribution range remains an open question with strong conservation implications. Focusing on the orange stony coral, <i>Astroides calycularis</i>, we i) characterized the pattern of neutral genetic diversity across the distribution range; ii) gave insights into the underlying processes; and iii) discussed conservation implications with emphasis on a national park located on a hotspot of genetic diversity.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>Location:</b> South Mediterranean Sea and Zembra National Park.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>We combined new data from 12 microsatellites in 13 populations located in the Centre and in the Western Periphery of the distribution range with a published dataset including 16 populations from the Western and Eastern Peripheries. We analysed the relationship among parameters of genetic diversity (<i>H<sub>e</sub></i>, <i>Ar<sub>(g)</sub></i>) and structure (population-specific <i>F<sub>ST</sub></i>) and two measures of geographic peripherality. We compared two estimators of pairwise genetic structure (<i>G<sub>ST</sub></i>, <i>D<sub>EST</sub></i>) across the distribution range. The evolutionary and demographic history of the populations following the Last Glacial Maximum was reconstructed using approximate Bayesian computations and Maximum Likelihood analyses. We inferred the contemporary connectivity among populations from Zembra National Park and with the neighbouring area of Cap Bon. </span></span></span></span></span></span></span></span></span></span></span><span><span><span><span><span><span><span><span><span><span><span>We demonstrate a decrease of genetic diversity and an increase of genetic differentiation from the Centre to the Eastern and Western Peripheries of the distribution range<i>. </i>Populations from Zembra show the highest genetic diversity reported in the species. We identified a spillover effect towards Cap Bon. </span></span></span></span></span></span></span></span></span></span></span><span><span><span><span><span><span><span><span><span><span><span>The patterns of genetic diversity and differentiation are most likely explained by "the postglacial range expansion hypothesis" rather than the "central-peripheral hypothesis". Enforcement of conservation measures should be considered to protect this genetic diversity pattern, in particular when considering the low effective population size inferred at many sites.</span></span></span></span></span></span></span></span></span></span></span></p>
FIGURE 11 in Split distribution, biogeography and morphological and genetic diversity of the Iberobathynellini Tribe in the family Parabathynellidae (Crustacea, Malacostraca, Bathynellacea)
FIGURE 11 Maxillule (MxI): A. Iberobathynella lamasonensis; B. I. cornejoensis; C. I. pedroi; D I. andalusica; E. I. burgalensis; F. I. paragracilipes; G. Paraiberobathynella notenboomi; H. Hexaiberobathynella mateusi; I. Guadalopebathynella puchi; J. Californibathynella californica; K. Texanobathynella aaronswinki; L. Parabathynella motasi; M. Montanabathynella pecosensis.
Data from: High genetic diversity and stable Pleistocene distributional ranges in the widespread Mexican red oak Quercus castanea Née (1801) (Fagaceae)
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Gradients of genetic diversity and differentiation across the distribution range of a Mediterranean coral: patterns, processes and conservation implications.
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Data from: Small-scale patterns in snowmelt timing affect gene flow and the distribution of genetic diversity in the alpine dwarf shrub Salix herbacea
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Data from: Distribution and genetic diversity of the rare plant Veratrum woodii (Liliales: Melanthiaceae) in Georgia: a preliminary study with AFLP fingerprint data
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