Dynamics of North American breeding bird populations

Nature ◽  
10.1038/30478 ◽  
1998 ◽  
Vol 393 (6682) ◽  
pp. 257-260 ◽  
Author(s):  
Timothy H. Keitt ◽  
H. Eugene Stanley
Keyword(s):  
North American ◽  
Breeding Bird ◽  
Bird Populations

scholarly journals A comparison of breeding bird populations inside and outside of European Badger Meles meles control areas

Bird Study ◽  
2021 ◽  
pp. 1-13
Author(s):  
Esther F. Kettel ◽  
Ivan Lakin ◽  
Matthew J. Heydon ◽  
Gavin M. Siriwardena
Keyword(s):  
Meles Meles ◽  
Breeding Bird ◽  
Bird Populations ◽  
European Badger

scholarly journals Avian Haemosporidian Diversity on Sardinia: A First General Assessment for the Insular Mediterranean

Diversity ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 75
Author(s):  
Irene Pellegrino ◽  
Luca Ilahiane ◽  
Giovanni Boano ◽  
Marco Cucco ◽  
Marco Pavia ◽  
...  
Keyword(s):  
Linear Models ◽  
Parasite Community ◽  
Breeding Birds ◽  
Lower Probability ◽  
Long Distance ◽  
Breeding Bird ◽  
Bird Populations ◽  
Total Prevalence ◽  
Western Palearctic ◽  
Host Parasite

The Western Palearctic is one of the most investigated regions for avian haemosporidian parasites (Haemoproteus, Plasmodium and Leucocytozoon), yet geographic gaps in our regional knowledge remain. Here, we report the first haemosporidian screening of the breeding birds from Sardinia (the second-largest Mediterranean Island and a biodiversity hotspot), and the first for the insular Mediterranean in general. We examined the occurrence of haemosporidians by amplifying their mtDNA cytb gene in 217 breeding birds, belonging to 32 species. The total prevalence of infected birds was 55.3%, and of the 116 haplotypes recovered, 84 were novel. Despite the high number of novel lineages, phylogenetic analysis did not highlight Sardinia-specific clades; instead, some Sardinian lineages were more closely related to lineages previously recovered from continental Europe. Host-parasite network analysis indicated a specialized host-parasite community. Binomial generalized linear models (GLMs), performed at the community level, suggested an elevational effect on haemosporidian occurrence probability (negative for Haemoproteus; positive for Leucocytozoon) likely due to differences in the abundance of insect vectors at different elevations. Furthermore, a GLM revealed that sedentary birds showed a higher probability of being infected by novel haplotypes and long-distance migrants showed a lower probability of novel haplotype infection. We hypothesize that the high diversity of haemosporidians is linked to the isolation of breeding bird populations on Sardinia. This study adds to the growing knowledge on haemosporidians lineage diversity and distribution in insular environments and presents new insights on potential host-parasite associations.

scholarly journals Long-term trends and drought: spatiotemporal variation in juvenile sex ratios of North American ducks

2021 ◽  
Author(s):  
Sage Ellis ◽  
Madeleine Lohman ◽  
James Sedinger ◽  
Perry Williams ◽  
Thomas Riecke
Keyword(s):  
United States ◽  
North American ◽  
Sex Ratios ◽  
Survival Rates ◽  
The United States ◽  
Avian Communities ◽  
Eastern United States ◽  
Bird Populations ◽  
Long Term Trends

Sex ratios affect population dynamics and individual fitness, and changing sex ratios can be indicative of shifts in sex-specific survival at different life stages. While climate- and landscape-change alter sex ratios of wild bird populations, long-term, landscape scale assessments of sex ratios are rare. Further, little work has been done to understand changes in sex ratios in avian communities. In this manuscript, we analyse long-term (1961-2015) data on five species of ducks across five broad climatic regions of the United States to estimate the effects of drought and long-term trends on the proportion of juvenile females captured at banding. As waterfowl have a 1:1 sex ratio at hatch, we interpret changes in sex ratios of captured juveniles as changes in sex-specific survival rates during early life. Seven of twelve species-region pairs exhibited evidence for long-term trends in the proportion of juvenile females at banding. The proportion of juvenile females at banding increased for duck populations in the western United States and typically declined for duck populations in the eastern United States. We only observed evidence for an effect of drought in two of the twelve species-region pairs, where the proportion of females declined during drought. As changes to North American landscapes and climate continue and intensify, we expect continued changes in sex-specific juvenile survival rates. More broadly, we encourage further research examining the mechanisms underlying long-term trends in juvenile sex ratios in avian communities.

Breeding Bird Populations in Missouri Ozark Forests with and without Clearcutting

1992 ◽  
Vol 56 (1) ◽  
pp. 23 ◽  
Author(s):  
Frank R. Thompson ◽  
William D. Dijak ◽  
Thomas G. Kulowiec ◽  
David A. Hamilton
Keyword(s):  
Breeding Bird ◽  
Bird Populations

Breeding Bird Populations during Twenty-Five Years of Postfire Succession in the Sierra Nevada

The Condor ◽  
1987 ◽  
Vol 89 (3) ◽  
pp. 614 ◽  
Author(s):  
Martin G. Raphael ◽  
Michael L. Morrison ◽  
Michael P. Yoder-Williams
Keyword(s):  
Sierra Nevada ◽  
Breeding Bird ◽  
Bird Populations ◽  
Postfire Succession
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