Results 11 to 20 of about 880,117 (356)
Nature, 1871 THE very interesting article on the Moa in your issue of July 6th by Dr. Hector adds considerably to the facts already ascertained as to its existence along with man, and also as to the probability of its recent disappearance. Visiting in 1866 and 1867 many of the places mentioned by the Doctor in the Middle Island, I had opportunities of seeing ...
James Melvin
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Are extinction opinions extinct? [PDF]
PeerJ, 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
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Hybridization and extinction [PDF]
Evolutionary Applications, 2016 AbstractHybridization may drive rare taxa to extinction through genetic swamping, where the rare form is replaced by hybrids, or by demographic swamping, where population growth rates are reduced due to the wasteful production of maladaptive hybrids. Conversely, hybridization may rescue the viability of small, inbred populations.
Gregory L. Owens +12 more
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AIMS Neuroscience, 2021 We aimed to investigate the persistent trace of one traumatic event on neurocircuit controls in rats. Conditioning was reflected by reductions in rates of ‘freezing’ and ‘other-than-freezing’ motor activities, between which rats could alternate on ...
Masatoshi Takita, Yumi Izawa-Sugaya
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Conservation of Colutea gifana, a rare and potential ornamental species, using in vitro method [PDF]
Journal of Cell and Molecular Research, 2010 In vitro methods provide a variety of tools to supplement traditional methods for collection, propagation and preservation of endangered plant species. In this study, an efficient protocol was developed for in vitro propagation of Colutea gifana, a rare ...
Mahnaz Kiani +3 more
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On the basic reproduction number in semi-Markov switching networks
Journal of Biological Dynamics, 2021 Basic reproduction number $ \mathcal {R}_0 $ in network epidemic dynamics is studied in the case of stochastic regime-switching networks. For generality, the dependence between successive networks is considered to follow a continuous time semi-Markov ...
Xiaochun Cao +3 more
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Neuron, 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
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Journal 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
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A comparative analysis of Galactic extinction at low Galactic latitudes [PDF]
, 2021 We use near-infrared (J-K)-colours of bright 2MASS galaxies, measured within a 7"-radius aperture, to calibrate the Schlegel et al. (1998) DIRBE/IRAS Galactic extinction map at low Galactic latitudes ($|b| < 10^{\rm o}$). Using 3460 galaxies covering a large range in extinction (up to $A_K$ = 1.15 or E(B-V) ~ 3.19), we derive a correction factor $f = 0.
arxiv +1 more source
Rules of thumb for conservation of metapopulations based on a stochastic winking-patch model [PDF]
, 2001 From a theoretical viewpoint, nature management basically has two options to prolong metapopulation persistence: decreasing local extinction probabilities and increasing colonization probabilities. This article focuses on those options with a stochastic,
Etienne, R.S., Heesterbeek, J.A.P.
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