Adaptations to light predict the foraging niche and disassembly of avian communities in tropical countrysides

Ecology ◽  
2020 ◽  
Author(s):  
Ian J. Ausprey ◽  
Felicity L. Newell ◽  
Scott K. Robinson



1998 ◽  
Vol 12 (1) ◽  
pp. 177-189 ◽  
Author(s):  
Kerry N. Rabenold ◽  
Peter T. Fauth ◽  
Bradley W. Goodner ◽  
Jennifer A. Sadowski ◽  
Patricia G. Parker


2021 ◽  
Author(s):  
Vladimír Remeš ◽  
Eva Remešová ◽  
Nicholas R. Friedman ◽  
Beata Matysioková ◽  
Lucia Rubáčová




2014 ◽  
Vol 328 ◽  
pp. 26-34 ◽  
Author(s):  
Edmund J. Zlonis ◽  
Gerald J. Niemi
Keyword(s):  


The Condor ◽  
1999 ◽  
Vol 101 (2) ◽  
pp. 311-323 ◽  
Author(s):  
Ian D. Thompson ◽  
Holly A. Hogan ◽  
William A. Montevecchi


2012 ◽  
Vol 43 (1) ◽  
pp. 73 ◽  
Author(s):  
Alexandre Caron ◽  
Michel de Garine-Wichatitsky ◽  
Mduduzi Ndlovu ◽  
Graeme S Cumming


Author(s):  
Sage Ellis ◽  
Madeleine Lohman ◽  
James Sedinger ◽  
Perry Williams ◽  
Thomas Riecke

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.



2006 ◽  
Vol 84 (12) ◽  
pp. 1853-1858 ◽  
Author(s):  
Sara Churchfield ◽  
Leszek Rychlik ◽  
Eduard Yavrouyan ◽  
Kris Turlejski

Microscopic examination of alimentary tracts of 14 Neomys teres Miller, 1908 from a mountainous region in northern Armenia produced the first data on the diet of this almost unknown species of conservation concern. Twenty-three different prey types were distinguished in summer-caught shrews, all of which were invertebrates (14 terrestrial and 9 aquatic in origin). The dominant dietary items were Coleoptera and Diptera adults, Araneae, Opiliones, and Lumbricidae, as well as freshwater crustaceans and Trichoptera larvae. Prey ranged from <3 to >16 mm in length, but those eaten most frequently were 6–10 mm in length. Although N. teres was captured beside streams and rivers, aquatic prey comprised only 27% of the dietary composition. Despite the morphological similarity of N. teres to Neomys fodiens (Pennant, 1771), its foraging niche more closely resembles that of upland populations of Neomys anomalus Cabrera, 1907 and its reliance on aquatic habitats remains equivocal.



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