Population Size and Breeding Phenology of Red-Billed Tropicbirds (Phaethon aethereus) on Iles de la Madeleine, Senegal

Waterbirds ◽  
2019 ◽  
Vol 42 (1) ◽  
pp. 100
Keyword(s):  
Population Size ◽  
Breeding Phenology ◽  
La Madeleine

scholarly journals Breeding biology and population increase of the Endangered Bermuda Petrel Pterodroma cahow

2012 ◽  
Vol 22 (1) ◽  
pp. 35-45 ◽  
Author(s):  
JEREMY MADEIROS ◽  
NICHOLAS CARLILE ◽  
DAVID PRIDDEL
Keyword(s):  
Climate Change ◽  
Population Size ◽  
Breeding Success ◽  
Reproductive Output ◽  
Small Population ◽  
Population Increase ◽  
Storm Damage ◽  
Breeding Phenology ◽  
North East ◽  
Rate Of Increase

SummaryThe Bermuda Petrel Pterodroma cahow was thought to have become extinct early in the 17th century due to a combination of hunting by human colonists and predation by introduced rats, cats, dogs and pigs. However, single individuals were found on four occasions during the first half of the 20th century, and in 1951 a small population was discovered breeding on several rocky islets in north-east Bermuda. Recovery actions began in 1962 when the population numbered just 18 pairs, dispersed among five small islets. Although rats extirpated one of these five colonies in 1967, the population has grown steadily to 56 breeding pairs in 2000. We investigated the breeding phenology, productivity and population size of the Bermuda Petrel between 2000/2001 and 2007/2008. Each year, the birds began arriving in Bermuda around mid-October. They departed on a pre-breeding exodus between 19 November and 14 December, returning after 32–56 days to lay a single egg between 31 December and 31 January. Eggs hatched from 16 February to 26 March after a mean (± SD) incubation period of 53 ± 2 days, and young fledged from 15 May to 25 June after a mean fledging period of 91 ± 5 days. Between 2000/2001 and 2007/2008, reproductive output ranged from 29 to 40 fledglings per annum. Mean annual breeding success (62%) was reasonably high relative to other Procellariiformes, largely due to the provision of artificial (concrete) nesting burrows. In 2008, the population numbered 85 breeding pairs. Monitoring since 1961 indicates the population has been increasing exponentially, doubling approximately every 22 years. This rate of increase, together with the increased incidence of storm damage, is making it progressively more impracticable to construct sufficient concrete burrows on the current nesting islets to accommodate all breeding pairs. The vulnerability of these sites to accelerating storm damage and erosion as a result of anthropomorphic climate change is now the greatest threat to the Bermuda Petrel.

Shifts in breeding phenology as a response to population size and climatic change: A comparison between short- and long-distance migrant species

The Auk ◽  
2012 ◽  
Vol 129 (4) ◽  
pp. 753-762 ◽  
Author(s):  
Aggeliki Doxa ◽  
Alexandre Robert ◽  
Alain Crivelli ◽  
Giorgos Catsadorakis ◽  
Theodoros Naziridis ◽  
...  
Keyword(s):  
Population Size ◽  
Climatic Change ◽  
Breeding Phenology ◽  
Long Distance

scholarly journals Changes in breeding phenology and population size of birds

2013 ◽  
Vol 83 (3) ◽  
pp. 729-739 ◽  
Author(s):  
Peter O. Dunn ◽  
Anders P. Møller
Keyword(s):  
Population Size ◽  
Breeding Phenology

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.

Sign in / Sign up

Export Citation Format

Share Document