Results 1 to 10 of about 948,700 (330)

Extinction and morphospace occupation: A critical review

open access: yesCambridge Prisms: Extinction, 2023
Processes of extinction, especially selectivity, can be studied using the distribution of species in morphospace. Random extinction reduces the number of species but has little effect on the range of morphologies or ecological roles in a fauna or flora ...
P. David Polly
doaj   +1 more source

Erasing the extinct: the hunt for Caribbean monk seals and museum collection practices [PDF]

open access: yesHistória, Ciências, Saúde: Manguinhos, 2022
The Caribbean monk seal (Monachus tropicalis), the only seal species native to Central America, was declared extinct in 2008, with the last confirmed sighting in 1952. This species historically had a broad range throughout the gulf of Mexico.
Dolly Jørgensen
doaj   +1 more source

Rethinking Extinction [PDF]

open access: yesNeuron, 2015
Extinction serves as the leading theoretical framework and experimental model to describe how learned behaviors diminish through absence of anticipated reinforcement. In the past decade, extinction has moved beyond the realm of associative learning theory and behavioral experimentation in animals and has become a topic of considerable interest in the ...
Dunsmoor, Joseph E.   +3 more
openaire   +2 more sources

Are extinction opinions extinct? [PDF]

open access: yesPeerJ, 2017
Extinction models vary in the information they require, the simplest considering the rate of certain sightings only. More complicated methods include uncertain sightings and allow for variation in the reliability of uncertain sightings. Generally extinction models require expert opinion, either as a prior belief that a species is extinct, or to ...
Lee, TE, Bowman, C, Roberts, DL
openaire   +4 more sources

Parasitological findings and antiparasitic treatment of captive Jaguarundis Herpailurus yagouaroundi (Carnivora: Felidae) in a conservation center in Brazil

open access: yesJournal of Threatened Taxa, 2018
Ex situ management of wildlife provides a possibility for species maintenance, research development and environmental education.  But as captive facilities are usually much smaller than the area occupied by a species in the natural habitat, cleaning ...
Nárjara Veras Grossmann   +3 more
doaj   +1 more source

Pinpointing Drivers of Extirpation in Sea Snakes: A Synthesis of Evidence From Ashmore Reef

open access: yesFrontiers in Marine Science, 2021
Over the past decade, vertebrate populations globally have experienced significant declines in distribution and abundance. Understanding the reasons behind these population declines is the first step in implementing appropriate management responses to ...
Ruchira Somaweera   +15 more
doaj   +1 more source

On Dust Extinction of Gamma-ray Burst Host Galaxies [PDF]

open access: yes, 2008
Although it is well recognized that gamma-ray burst (GRB) afterglows are obscured and reddened by dust in their host galaxies, the wavelength-dependence and quantity of dust extinction are still poorly known.
Kann, D. A.   +5 more
core   +2 more sources

The Mid-Infrared Extinction Law in the Ophiuchus, Perseus, and Serpens Molecular Clouds [PDF]

open access: yes, 2008
We compute the mid-infrared extinction law from 3.6-24 microns in three molecular clouds: Ophiuchus, Perseus, and Serpens, by combining data from the "Cores to Disks" Spitzer Legacy Science program with deep JHKs imaging.
Chapman, Nicholas L.   +3 more
core   +2 more sources

Impaired contextual modulation of memories in PTSD: an fMRI and psychophysiological study of extinction retention and fear renewal [PDF]

open access: yes, 2014
Post-traumatic stress disorder (PTSD) patients display pervasive fear memories, expressed indiscriminately. Proposed mechanisms include enhanced fear learning and impaired extinction or extinction recall. Documented extinction recall deficits and failure
Abelson, James L   +6 more
core   +1 more source

Environmental enrichment facilitates cocaine-cue extinction, deters reacquisition of cocaine self-administration and alters AMPAR GluA1 expression and phosphorylation [PDF]

open access: yes, 2015
This study investigated the combination of environmental enrichment (EE) with cocaine‐cue extinction training on reacquisition of cocaine self‐administration.
Dhonnchadha, Brid Aine Nic   +5 more
core   +1 more source

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