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66 results for “in situ conservation”
Fig. 1 in Captive breeding program for Scinax alcatraz (Anura: Hylidae): introducing amphibian ex situ conservation in Brazil
Fig. 1. Adult male of Scinax alcatraz. Photo by Cybele Lisboa.
Fig. 1 in Ex-situ conservation of the critically endangered swamp forest crab Parathelphusa reticulata Ng, 1990 (Decapoda: Brachyura: Gecarcinucidae): observations on its reproduction and biology in captivity
Fig. 1. Captive breeding facility in the Singapore Botanic Gardens. Photograph: Daniel J. J. Ng.
The Household Context of In Situ Conservation in a Center of Crop Diversity in Oaxaca, Mexico
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Admixture and reproductive skew shape the conservation value of ex situ populations of the Critically Endangered eastern black rhino - microsatellite and mitochondrial genotype data
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A gap analysis modeling framework to prioritize collecting for ex situ conservation of crop landraces
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Using Population Viability Analysis (PVA) to inform and adapt ex situ conservation activities benefitting a Critically Endangered butterfly
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Data from: Rebuilding the critically endangered Yangtze finless porpoise population: Successful release from an ex situ conservation programme
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Data from: Combining spatial, genetic, and environmental risk data to define and prioritize in situ conservation units
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In-situ and ex-situ conservation priorities and distribution of lentil wild relatives under climate change: A modeling approach
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Genomic structure and ex situ conservation of the North American grapevine <em>Vitis labrusca</em>
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Data for: Shifts in plant-invertebrate interactions between wild and ex-situ conservation populations of a critically endangered tree
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In-situ feeding as a new management tool to conserve orphaned Eurasian lynx (Lynx lynx)
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Taxonomic similarity does not predict necessary sample size for ex situ conservation: a comparison among five genera
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Predictive genetic plan for a captive population of the Chinese goral (Naemorhedus griseus) and prescriptive action for ex situ and in situ conservation management in Thailand
<p>Captive breeding programs for endangered species can increase population numbers for eventual reintroduction to the wild. Captive populations are typically small and isolated, which results in inbreeding and reduction of genetic variability, and may lead to an increased risk of extinction. The Omkoi Wildlife Breeding Center maintains the only Thai captive Chinese goral (<i>Naemorhedus griseus</i>) population, and has plans to reintroduce individuals into natural isolated populations. Genetic variability was assessed within the captive population using microsatellite data. Although no bottleneck was observed, genetic variability was low (allelic richness = 7.091 ± 0.756, <i>H</i><sub>e</sub> = 0.455 ± 0.219; <i>H</i><sub>e</sub> < <i>H</i><sub>o</sub>) and 11 microsatellite loci were informative that likely reflect inbreeding. Estimates of small effective population size and limited numbers of founders, combined with wild-born individuals within subpopulations, tend to cause reduction of genetic variability over time in captive programs. This leads to low reproductive fitness and limited ability to adapt to environmental change, thereby increasing the risk of extinction. Management of captive populations as evolutionarily significant units with diverse genetic backgrounds offers an effective strategy for population recovery. Relocation of individuals among subpopulations, or introduction of newly captured wild individuals into the captive program will help to ensure the future security of Chinese goral. Implications for future conservation actions for the species are discussed herein.</p>
Data from: Structural diversity of naturally regenerating Chinese yew (Taxus wallichiana var. mairei) populations in an ex situ conservation
The Chinese yew (Taxus wallichiana var. mairei) is ranked among the first class of important wild endangered plants in China. However, due to its overexploitation, it now occurs scattered in the forest undergrowth along the Yangtze River Valley. To improve this tree's conservation management, we used structural indices to investigate the structural diversity of naturally regenerating yew populations that have established via ex situ conservation. The results show that most yews had larger non-yew tree neighbors; these were 30–70% larger than their reference trees. Collectively, the average distances between the yews and the three nearest-neighboring trees were short (<3 m). This result suggests that the yews likely face strong interspecific competition from neighbors. In these two forest stands, most of the pole-sized yews are found beneath a single tall neighboring tree (height ≥10 m), and their growth was enhanced under a single neighboring tree but not under two, three or zero neighboring trees. Finally, we recommend simple silvicultural treatments to reduce interspecific competition; specifically, the cutting or pruning of branches of large neighboring trees in tandem with the thinning of canopy trees growing next to the mother yews.
Data from: Genetic evidence of hybridization between the critically endangered Cuban crocodile and the American crocodile: implications for population history and in situ/ex situ conservation
Inter-specific hybridization may be especially detrimental when one species is extremely rare and the other is abundant owing to the potential for genetic swamping. The Cuban crocodile (Crocodylus rhombifer) is a critically endangered island endemic largely restricted to Zapata Swamp, where it is sympatric with the widespread American crocodile (C. acutus). An on-island, C. rhombifer captive breeding program is underway with the goals of maintaining taxonomic integrity and providing a source of individuals for reintroduction, but its conservation value is limited by lack of genetic information. Here we collected mtDNA haplotypic and nuclear genotypic data from wild and captive C. rhombifer and C. acutus in Cuba to: (1) investigate the degree of inter-specific hybridization in natural (in situ) and captive (ex situ) populations; (2) quantify the extent, distribution and in situ representation of genetic variation ex situ; and (3) reconstruct founder relatedness to inform management. We found high levels of hybridization in the wild (49.1%) and captivity (16.1%), and additional evidence for a cryptic lineage of C. acutus in the Antilles. We detected marginally higher observed heterozygosity and allelic diversity ex situ relative to the wild population, with captive C. rhombifer exhibiting over twice the frequency of private alleles. Although mean relatedness was high in captivity, we identified 37 genetically important individuals that possessed individual mean kinship (MK) values lower than the population MK. Overall, these results will guide long-term conservation management of Cuban crocodiles for maintaining the genetic integrity and viability of this species of high global conservation value.
Figure 4 in A phylogeographical perspective on the ex situ conservation of Aylacostoma (Thiaridae, Gastropoda) from the High Paraná River (Argentina-Paraguay)
Figure 4. Maximum-likelihood tree of Aylacostoma specimens based on 658 nucleotides of the partial cytochrome oxidase subunit I gene and the spatial distribution of geographical populations in the High Paraná River. Bootstrap values are shown above and below the branches. Numbers within clades are GenBank accession numbers. References to localities are given in Table 1.
Figure 5 in A phylogeographical perspective on the ex situ conservation of Aylacostoma (Thiaridae, Gastropoda) from the High Paraná River (Argentina-Paraguay)
Figure 5. Divergence times for Aylacostoma from the High Paraná River. The nodes in the phylogram are presented according to the mean value of oldest estimated age, assuming different divergence rates and substitution models. Divergence between A. chloroticum and A. brunneum = 3.60 Mya (K2P); divergence within A. chloroticum = 0.38 Mya (GTR+I+G). The bars around each node represent the minimum and maximum estimated age. Time scale adapted from the International Chronostratigraphic Chart (International Commission on Stratigraphy, 2014).
Figure 3 in A phylogeographical perspective on the ex situ conservation of Aylacostoma (Thiaridae, Gastropoda) from the High Paraná River (Argentina-Paraguay)
Figure 3. Median-joining network depicting all haplotypes found for the Aylacostoma specimens from the High Paraná River included in the ex situ conservation programme. The size of circles is proportional to haplotype frequency. Mutational steps separating haplotypes are indicated. For localities, see Table 1.
Figure 2 in A phylogeographical perspective on the ex situ conservation of Aylacostoma (Thiaridae, Gastropoda) from the High Paraná River (Argentina-Paraguay)
Figure 2. Evolution of the old port of Candelaria city (Misiones, Argentina; 27°26′50.96″S, 55°45′0.84″W). This is the only location along the High Paraná River where a wild population of Aylacostoma chloroticum is still known to occur after completing the filling of the Yacyretá Reservoir in 2011. Note the drastic modification of the environment between 2003 and November 2011, with the construction of an artificial beach for recreational use. The white arrow highlights the increase in water level between August and December 2010.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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