10 results match your criteria imperiled taxon

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Developmental instability and phenotypic evolution in a small and isolated bear population.

Biol Lett 2021 04 21;17(4):20200729. Epub 2021 Apr 21.

Research Institute on Terrestrial Ecosystems, National Research Council, 00015 Montelibretti, Rome, Italy.

We explored fluctuating asymmetry (FA) and morphological integration (MI) in the skull of the small, highly inbred and divergent Apennine bear (), to explore its uniqueness and investigate any potential effects of inbreeding depression. We used 3D geometric morphometrics contrasting Apennine bears with other two large outbred bear populations from Scandinavia and Kamchatka as controls. Shape divergence and variability were explored by a principal component analysis on aligned coordinates of 39 landmarks. Read More

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Fostering Conservation via an Integrated Use of Conventional Approaches and High-Throughput SPET Genotyping: A Case Study Using the Endangered Canarian Endemics and (Solanaceae).

Front Plant Sci 2020 10;11:757. Epub 2020 Jul 10.

Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, United States.

Islands provide unique opportunities to integrated research approaches to study evolution and conservation because boundaries are circumscribed, geological ages are often precise, and many taxa are greatly imperiled. We combined morphological and hybridization studies with high-throughput genotyping platforms to streamline relationships in the endangered monophyletic and highly diverse lineage of in the Canarian archipelago, where three endemic taxa are currently recognized. Inter-taxa hybridizations were performed, and morphological expression was assessed with a common-garden approach. Read More

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A field study of auditory sensitivity of the Atlantic puffin, .

J Exp Biol 2020 08 13;223(Pt 15). Epub 2020 Aug 13.

The University of Iceland's Research Center in Húsavík, 640 Húsavík, Iceland.

Hearing is vital for birds as they rely on acoustic communication with parents, mates, chicks and conspecifics. Amphibious seabirds face many ecological pressures, having to sense cues in air and underwater. Natural noise conditions have helped shape this sensory modality but anthropogenic noise is increasingly impacting seabirds. Read More

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Formation of a recent hybrid zone offers insight into the geographic puzzle and maintenance of species boundaries in musk turtles.

Mol Ecol 2019 02 6;28(4):761-771. Epub 2019 Feb 6.

Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama.

Speciation is the result of an accumulation of reproductive barriers between populations, but pinpointing the factors involved is often difficult. However, hybrid zones can form when these barriers are not complete, especially when lineages come into contact in intermediate or modified habitats. We examine a hybrid zone between two closely related riverine turtle species, Sternotherus depressus and S. Read More

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February 2019

The hidden : How science Twitter uncovered a globally imperiled species in Pennsylvania, USA.

PhytoKeys 2018 17(96):87-97. Epub 2018 Apr 17.

Department of Biology, Wayne E. Manning Herbarium, Bucknell University, 1 Dent Drive, Lewisburg, PA USA.

The genus is recognized as one of the most diverse endemic radiations of Saxifragaceae in North America, yet species delimitation and geographic distribution within the group remain controversial. Many species remain difficult to identify, including , a narrow Appalachian endemic and globally imperiled (G2) taxon recorded only from West Virginia and Virginia that occurs in sympatry with and . A recent survey of the cliffside flora of the Shikellamy Bluffs, PA recorded dozens of individuals that, through the use of social media, were positively identified as . Read More

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A simple, sufficient, and consistent method to score the status of threats and demography of imperiled species.

PeerJ 2016 14;4:e2230. Epub 2016 Jul 14.

Endangered Species Conservation, Defenders of Wildlife , Washington , D.C. , United States of America.

Managers of large, complex wildlife conservation programs need information on the conservation status of each of many species to help strategically allocate limited resources. Oversimplifying status data, however, runs the risk of missing information essential to strategic allocation. Conservation status consists of two components, the status of threats a species faces and the species' demographic status. Read More

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Successive invasion-mediated interspecific hybridizations and population structure in the endangered cichlid Oreochromis mossambicus.

PLoS One 2013 9;8(5):e63880. Epub 2013 May 9.

UMR CNRS 6282 Biogéosciences - Université de Bourgogne, Dijon, France.

Hybridization between invasive and native species accounts among the major and pernicious threats to biodiversity. The Mozambique tilapia Oreochromis mossambicus, a widely used freshwater aquaculture species, is especially imperiled by this phenomenon since it is recognized by the IUCN as an endangered taxon due to genetic admixture with O. niloticus an invasive congeneric species. Read More

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December 2013

Computing evolutionary distinctiveness indices in large scale analysis.

Algorithms Mol Biol 2012 Apr 13;7. Epub 2012 Apr 13.

IRMACS and BioSciences, Simon Fraser University, 8888 University Drive, Burnaby, V5A 1S6 Canada.

We present optimal linear time algorithms for computing the Shapley values and 'heightened evolutionary distinctiveness' (HED) scores for the set of taxa in a phylogenetic tree. We demonstrate the efficiency of these new algorithms by applying them to a set of 10,000 reasonable 5139-species mammal trees. This is the first time these indices have been computed on such a large taxon and we contrast our finding with an ad-hoc index for mammals, fair proportion (FP), used by the Zoological Society of London's EDGE programme. Read More

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Molecular phylogenetics and evolution of turtles.

Mol Phylogenet Evol 2005 Oct;37(1):178-91

Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, 50011-3223, USA.

Turtles are one of Earth's most instantly recognizable life forms, distinguished for over 200 million years in the fossil record. Even so, key nodes in the phylogeny of turtles remain uncertain. To address this issue, we sequenced >90% of the nuclear recombination activase gene 1 (RAG-1) for 24 species representing all modern turtle families. Read More

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October 2005

Microsatellites uncover extraordinary diversity in native American land races and wild populations of cultivated sunflower.

Theor Appl Genet 2003 Apr 11;106(6):990-1003. Epub 2002 Oct 11.

Department of Crop and Soil Science, Oregon State University, Corvallis 97331-3002, USA.

The contemporary oilseed sunflower (Helianthus annuus L.) gene pool is a product of multiple breeding and domestication bottlenecks. Despite substantial phenotypic diversity, modest differences in molecular genetic diversity have been uncovered in anciently and recently domesticated sunflowers. Read More

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