Changes in Vegetation Structure and Gopher Tortoise Population Structure after 17 Years of Restoration Management

10.3375/21-3 ◽  
2021 ◽  
Vol 41 (4) ◽  
Author(s):  
Rebecca C. Pudner ◽  
Hardin Waddle ◽  
Suzi P. Mersmann ◽  
John S. Kush ◽  
Craig Guyer ◽  
...  
Keyword(s):  
Population Structure ◽  
Vegetation Structure ◽  
Gopher Tortoise ◽  
Restoration Management

scholarly journals Mapping of dextral : sinistral proportions in the chirally dimorphic land snail Amphidromus inversus

2014 ◽  
Author(s):  
Menno Schilthuizen ◽  
Sylvia Looijestijn ◽  
Sek Chuan Chua ◽  
Ruth F. Castillo Cajas
Keyword(s):  
Population Structure ◽  
Vegetation Structure ◽  
Predation Rate ◽  
Land Snail ◽  
Mirror Image ◽  
Single Population ◽  
Modelling Studies ◽  
Vegetation Parameters ◽  
Genetically Determined ◽  
Predation Rates

One of the very few snail taxa that display genetic antisymmetry (that is, roughly even mixes of genetically determined clockwise and anticlockwise individuals within a single population) are the circa 35 species of the tropical tree snail subgenus Amphidromus. Previous work has shown that this may be due to a particular type of sexual selection, in which sperm transfer is improved in copulations between the two mirror-image morphs. However, it is not yet clear why so often significant deviations from 50:50 proportions are found. Modelling studies show that population structure will affect the degree by which the dimorphism is skewed towards the morph associated with the recessive allele. In this study, we mapped the proportions of sinistrals (PropS) in 56 demes in A. inversus on the Malaysian island of Kapas. We also mapped population density, predation rates, and several measures of vegetation structure. Our results show that PropS amounts on average to 0.65, but across the island varies from 0.30 to 0.85. Density and overall predation are inversely correlated, but neither predicts PropS. Vegetation parameters also do not correlate with the proportion of sinistrals. We do, however, find a negative correlation between the predation rate on sinistrals and PropS, a finding which may warrant further study.

scholarly journals Range-Wide and Regional Patterns of Population Structure and Genetic Diversity in the Gopher Tortoise

2017 ◽  
Vol 8 (2) ◽  
pp. 497-512 ◽  
Author(s):  
D. Gaillard ◽  
J.R. Ennen ◽  
B.R. Kreiser ◽  
C.P. Qualls ◽  
S.C. Sweat ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Gene Flow ◽  
Microsatellite Loci ◽  
Spatial Scales ◽  
Demographic History ◽  
Genetic Admixture ◽  
Gopher Tortoise ◽  
Regional Patterns ◽  
Genetic Groups

Abstract The gopher tortoise (Gopherus polyphemus) has experienced dramatic population declines throughout its distribution in the southeastern United States and is federally listed as threatened in the area west of the Tombigbee and Mobile rivers. While there is molecular support for recognizing the listed portion of the range as genetically distinct, other research has suggested that additional population structure exists at both range-wide and regional scales. In this study, we sought to comprehensively define genetic population structure at both spatial scales by doubling the data available in terms of the number of sampling sites, individuals, and microsatellite loci compared to previously published work. We also compared patterns of genetic diversity, gene flow, and demographic history across the range. We collected 933 individuals from 47 sampling sites across the range and genotyped them for 20 microsatellite loci. Our range-wide analyses supported the recognition of five genetic groups (or regions) delineated by the Tombigbee and Mobile rivers, Apalachicola and Chattahoochee rivers, and the transitional areas between several physiographic province sections of the Coastal Plains (i.e., Eastern Gulf, Sea Island, and Floridian). We found genetic admixture at sampling sites along the boundaries of these genetically defined groups. We detected some degree of additional genetic structure within each of the five regions. Notably, within the range listed as threatened under the Endangered Species Act, we found some support for two additional genetic groups loosely delineated by the Pascagoula and Chickasawhay rivers, and we detected four more genetic groups within the Florida region that seemed to reflect the influence of the local physiography. Additionally, our range-wide analysis found the periphery of the range had lower levels of genetic diversity relative to the core. We suggest that the five main genetic groups delineated in our study warrant recognition as management units in terms of conservation planning. Intraregional population structure also points to the potential importance of other barriers to gene flow at finer spatial scales, although additional work is needed to better delineate these genetic groups.

Analisis Keragaman Tanaman Sebagai Jasa Lingkungan Pada Lanskap Agroforestri di Daerah Aliran Sungai Krueng Aceh

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Zulkifli Aiyub Kadir ◽  
Bahagia Bahagia
Keyword(s):  
Water Conservation ◽  
Vegetation Structure ◽  
Swot Analysis ◽  
Diversity Index ◽  
Middle Stream ◽  
Land Management System ◽  
Study Sites ◽  
Aleurites Moluccana ◽  
Lansium Domesticum ◽  
Agroforestry Practices

<p>Humans have utilized landscape for  produces a diverse character of the wider area of the watershed. Agroforestry is a land management system in addressing the problems that arise due to changes in land use of soil and water conservation. The aim of the study was to analyze plant diversity in agroforestry practices that have services in the Krueng watershed landscape in Aceh watershed. Develop strategies in the Krueng Aceh DAS agroforestry service. This research was conducted in the upper, middle and downstream of the Krueng Aceh watershed, with a rapid method of Agro-Biodiversity Appraisal and SWOT. The results showed that the composition of the vegetation structure found in the study sites tended to vary with the diversity index of agroforestry that was currently in the upstream and middle of the Krueng Aceh watershed. Based on SWOT analysis, internal scores are 2.45 and external scores are 3.21. Agroforestry practices in the upper stream of Krueng Aceh watershed were dominated by <em>Aleurites moluccana</em>, <em>Areca cathecu</em>, and  <em>Averrhoa bilimbi</em> L  species with the highest INP in the upper stream of Krueng Aceh watershed. Vegetation at the middle stream of Krueng Aceh watershed dominated by <em>Areca cathecu,</em> <em>Lansium domesticum</em> and Musa<em> paradisiaca</em>.  </p>

The Vegetation Structure of Evergreen Coniferous Forests of Daehuksan Island in the Dadohaehaesang National Park

2018 ◽  
Vol 30 (1) ◽  
pp. 173-193 ◽  
Author(s):  
Yeongjun Cho ◽  
Hasong Kim ◽  
Hyeonho Myeong ◽  
Jungwon Park ◽  
Janggeun Oh
Keyword(s):  
Vegetation Structure ◽  
National Park ◽  
Coniferous Forests
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