scholarly journals Hatch date influences pre-fledging survival of temperate-nesting Canada geese

2018 ◽  
Vol 2018 (1) ◽  
Author(s):  
Amélie Fontaine ◽  
Eric T. Reed ◽  
Jean Rodrigue ◽  
Jean-François Giroux
Keyword(s):  
2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Justin H White ◽  
Jessi L Brown ◽  
Zachary E Ormsby

Abstract Despite the unique threats to wildlife in urban areas, many raptors have established successfully reproducing urban populations. To identify variations in raptor breeding ecology within an urban area, we compared metrics of Red-tailed Hawk reproductive attempts to landscape characteristics in Reno and Sparks, NV, USA during the 2015 and 2016 breeding seasons. We used the Apparent Nesting Success and logistic exposure methods to measure nesting success of the Red-tailed Hawks. We used generalized linear models to relate nesting success and fledge rate to habitat type, productivity to hatch date (Julian day) and hatch date to urban density. Nesting success was 86% and 83% for the respective years. Nesting success increased in grassland-agricultural and shrub habitats and decreased in riparian habitat within the urban landscape. Productivity was 2.23 and 2.03 per nest for the breeding seasons. Fledge rates were 72% and 77%, respectively, and decreased in riparian areas. Nestlings hatched earlier with increased urban density and earliest in suburban areas, following a negative quadratic curve. Nesting success and productivity for this population were high relative to others in North America. Productivity increased in habitats where ground prey was more accessible. We suggest that suburban areas, if not frequently disturbed, provide sufficient resources to sustain Red-tailed Hawks over extended periods. As urban expansion continues in arid environments globally, we stress that researchers monitor reproductive output across the urban predator guild to elucidate patterns in population dynamics and adaptation.


Ecosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
Author(s):  
J. Boomer Malanchuk ◽  
Beth E. Ross ◽  
David A. Haukos ◽  
Thomas F. Bidrowski ◽  
Richard Schultheis
Keyword(s):  

1989 ◽  
Vol 2 ◽  
pp. 175-183 ◽  
Author(s):  
Daniel J. Chure

“Although I work a lot with fossils in my own research on fishes, I do not care to be called a paleontologist; and I am turned off by many aspects of the public-relations hoopla surrounding paleontology, especially dinosaurs…. One could easily argue that the schools' fascination with dinosaurs might also detract from the other aspects of earth science and biological science and, in the end, weaken paleontology's image as an activity for hard-nosed grown-ups.”K.S. Thomson, 1985: p. 73“Let dinosaurs be dinosaurs. Let the Dinosauria stand proudly alone, a Class by itself. They merit it. And let us squarely face the dinosaurness of birds and the birdness of the Dinosauria. When the Canada geese honk their way northward, we can say: “The dinosaurs are migrating, it must be spring!”R.T. Bakker, 1986: p. 462It is a now oft-repeated statement that we are in the Second Golden Age of dinosaur studies. This may at first seem to be yet another overstatement by dinosaur fanatics; in fact, it is substantiated on a number of fronts. Research activity is certainly at an all-time high, with resident dinosaur researchers on every continent (except Antarctica) and dinosaurs known from every continent (including Antarctica). This activity has resulted in a spate of discoveries, including not only new genera and species, but entirely new types of dinosaurs, such as the segnosaurs. Well-known groups are producing surprises, such as armored sauropods and sauropods bearing tail clubs. Good specimens of previously named genera are revealing unsuspected structural features that almost defy explanation, as in the skull of Oviraptor. However, dinosaur studies extend far beyond the traditional emphasis on dinosaur morphology, and encompass paleobiogeography, paleoecology, taphonomy, physiology, tracks, eggs, histology, and extinction, among others. In some cases, several of these studies can be applied to a single taxon or locality to give us a fairly detailed understanding of the paleobiology of some species.


Bird-Banding ◽  
1951 ◽  
Vol 22 (3) ◽  
pp. 143
Author(s):  
C. F. Yocom ◽  
D. S. Farner ◽  
Harold A. Hanson ◽  
Robert H. Smith

1997 ◽  
Vol 61 (1) ◽  
pp. 183 ◽  
Author(s):  
James O. Leafloor ◽  
Donald H. Rusch
Keyword(s):  

2007 ◽  
Vol 36 (4) ◽  
pp. 341-347 ◽  
Author(s):  
P. Katavolos ◽  
S. Staempfli ◽  
W. Sears ◽  
A. Y. Gancz ◽  
D. A. Smith ◽  
...  

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