Surviving north of the natural range: the importance of density independence in determining population size

2009 ◽  
Vol 277 (3) ◽  
pp. 232-240 ◽  
Author(s):  
E. R. Unnsteinsdottir ◽  
P. Hersteinsson
Keyword(s):  
Population Size ◽  
Density Independence ◽  
Natural Range

scholarly journals Status and distribution of the endemic Bali starling Leucopsar rothschildi

Oryx ◽  
2000 ◽  
Vol 34 (3) ◽  
pp. 188-197 ◽  
Author(s):  
S. (Bas) van Balen ◽  
I Wayan A. Dirgayusa ◽  
I Made W. Adi Putra ◽  
Herbert H. T. Prins
Keyword(s):  
Population Size ◽  
Small Area ◽  
Small Population ◽  
Critically Endangered ◽  
Suitable Habitat ◽  
Pet Trade ◽  
Monsoon Forest ◽  
Habitat Conversion ◽  
Natural Range ◽  
Precarious Situation

AbstractThe Bali starling Leucopsar rothschildi is a passerine endemic to the dry monsoon forest of the island of Bali, Indonesia. Habitat conversion and excessive capture for the pet trade brought the species to the verge of extinction in the 1980s. The species is critically endangered because of 1) an extremely small population size, 2) restriction to a small area, 3) illegal trapping, and 4) diminishing suitable habitat left within its natural range. An intricate web of factors prevents the Bali starling from emerging from this precarious situation.

Reduction of spermatogonia and testosterone in rat testes flown on space lab-3

1986 ◽  
Vol 44 ◽  
pp. 248-249
Author(s):  
Delbert E. Philpott ◽  
W. Sapp ◽  
C. Williams ◽  
T. Fast ◽  
J. Stevenson ◽  
...  
Keyword(s):  
Social Interaction ◽  
Social Status ◽  
Population Size ◽  
Physiological Response ◽  
Social Rank ◽  
Reproductive Function ◽  
Testicular Development ◽  
Organ Weights ◽  
Reproductive Maturation ◽  
Metabolic Activities

Space Lab 3 (SL-3) was flown on Shuttle Challenger providing an opportunity to measure the effect of spaceflight on rat testes. Cannon developed the idea that organisms react to unfavorable conditions with highly integrated metabolic activities. Selye summarized the manifestations of physiological response to nonspecific stress and he pointed out that atrophy of the gonads always occurred. Many papers have been published showing the effects of social interaction, crowding, peck order and confinement. Flickinger showed delayed testicular development in subordinate roosters influenced by group numbers, social rank and social status. Christian reported increasing population size in mice resulted in adrenal hypertrophy, inhibition of reproductive maturation and loss of reproductive function in adults. Sex organ weights also declined. Two male dogs were flown on Cosmos 110 for 22 days. Fedorova reported an increase of 30 to 70% atypical spermatozoa consisting of tail curling and/or the absence of a tail.

Estimating Population Size from Dung-based DNA Capture�Recapture Data

2007 ◽  
Vol 3 (2) ◽  
Author(s):  
Paul M. Lukacs ◽  
Lori S. Eggert ◽  
Kenneth P. Burnham
Keyword(s):  
Population Size
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