scholarly journals Bachman's Sparrow survival and nest predation response to a hardwood canopy reduction experiment

Ecosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
Author(s):  
Kristen M. Malone ◽  
Theron M. Terhune ◽  
Kathryn E. Sieving
Keyword(s):  
Nest Predation ◽  
Reduction Experiment

Nest-predation at the edge: an experimental study contrasting two types of edges in the dry Chaco, Paraguay

Ecography ◽  
2001 ◽  
Vol 24 (6) ◽  
pp. 742-750 ◽  
Author(s):  
Lena M. Eriksson ◽  
Lars Edenius ◽  
Veronika Areskoug ◽  
Dennis A. Meritt Jr
Keyword(s):  
Experimental Study ◽  
Nest Predation

Elevated nest predation risk promotes offspring size variation in birds with prolonged parental care.

2019 ◽  
Author(s):  
Gretchen F. Wagner ◽  
Emeline Mourocq ◽  
Michael Griesser
Keyword(s):  
Predation Risk ◽  
Reproductive Cycle ◽  
Perceived Risk ◽  
Nest Predation ◽  
Bird Species ◽  
Size Variation ◽  
Egg Laying ◽  
Offspring Size ◽  
Natural Predation ◽  
Risk Spreading

Predation of offspring is the main cause of reproductive failure in many species, and the mere fear of offspring predation shapes reproductive strategies. Yet, natural predation risk is ubiquitously variable and can be unpredictable. Consequently, the perceived prospect of predation early in a reproductive cycle may not reflect the actual risk to ensuing offspring. An increased variance in investment across offspring has been linked to breeding in unpredictable environments in several taxa, but has so far been overlooked as a maternal response to temporal variation in predation risk. Here, we experimentally increased the perceived risk of nest predation prior to egg-laying in seven bird species. Species with prolonged parent-offspring associations increased their intra-brood variation in egg, and subsequently offspring, size. High risk to offspring early in a reproductive cycle can favour a risk-spreading strategy particularly in species with the greatest opportunity to even out offspring quality after fledging.

scholarly journals Glucocorticoids, state-dependent reproductive investment and success in the face of danger in a long-lived bird

2020 ◽  
Author(s):  
Kristina Noreikienė ◽  
Kim Jaatinen ◽  
Benjamin B. Steele ◽  
Markus Öst
Keyword(s):  
Predation Risk ◽  
Telomere Length ◽  
Clutch Size ◽  
Body Condition ◽  
Nest Predation ◽  
Hatching Success ◽  
Reproductive Investment ◽  
Trade Off ◽  
Relative Telomere Length ◽  
Future Reproduction

AbstractGlucocorticoid hormones may mediate trade-offs between current and future reproduction. However, understanding their role is complicated by predation risk, which simultaneously affects the value of the current reproductive investment and elevates glucocorticoid levels. Here, we shed light on these issues in long-lived female Eiders (Somateria mollissima) by investigating how current reproductive investment (clutch size) and hatching success relate to faecal glucocorticoid metabolite [fGCM] level and residual reproductive value (minimum years of breeding experience, body condition, relative telomere length) under spatially variable predation risk. Our results showed a positive relationship between colony-specific predation risk and mean colony-specific fGCM levels. Clutch size and female fGCM were negatively correlated only under high nest predation and in females in good body condition, previously shown to have a longer life expectancy. We also found that younger females with longer telomeres had smaller clutches. The drop in hatching success with increasing fGCM levels was least pronounced under high nest predation risk, suggesting that elevated fGCM levels may allow females to ensure some reproductive success under such conditions. Hatching success was positively associated with female body condition, with relative telomere length, particularly in younger females, and with female minimum age, particularly under low predation risk, showing the utility of these metrics as indicators of individual quality. In line with a trade-off between current and future reproduction, our results show that high potential for future breeding prospects and increased predation risk shift the balance toward investment in future reproduction, with glucocorticoids playing a role in the resolution of this trade-off.

Interactive effects of habitat attributes and predator identity explain avian nest predation patterns

2021 ◽  
pp. 1-11
Author(s):  
M. Soledad Vazquez ◽  
Lucía B. Zamora-Nasca ◽  
Mariano A. Rodriguez-Cabal ◽  
Guillermo C. Amico
Keyword(s):  
Nest Predation ◽  
Interactive Effects ◽  
Predator Identity ◽  
Avian Nest

Conditioned food aversion reduces crow nest predation: An improved framework for CFA trials

2021 ◽  
Vol 60 ◽  
pp. 125970
Author(s):  
Angela J. Ferguson ◽  
Robert L. Thomson ◽  
Martha J. Nelson-Flower ◽  
Thomas P. Flower
Keyword(s):  
Nest Predation ◽  
Food Aversion ◽  
Conditioned Food Aversion

Landscape features associated to wind farms increase mammalian predator abundance and ground-nest predation

2021 ◽  
Author(s):  
Julia Gómez-Catasús ◽  
Adrián Barrero ◽  
Margarita Reverter ◽  
Daniel Bustillo-de la Rosa ◽  
Cristian Pérez-Granados ◽  
...  
Keyword(s):  
Nest Predation ◽  
Wind Farms ◽  
Landscape Features ◽  
Mammalian Predator ◽  
Predator Abundance

scholarly journals Do Repugnant Scents Increase Survival of Ground Nests? A Test with Artificial and Natural Duck Nests

2007 ◽  
Vol 121 (2) ◽  
pp. 150
Author(s):  
Vanessa B. Harriman ◽  
Justin A. Pitt ◽  
Serge Larivière
Keyword(s):  
Human Hair ◽  
Nest Predation ◽  
Survival Rates ◽  
Olfactory Cues ◽  
Artificial Nests ◽  
Treatment Groups ◽  
Mammalian Predators ◽  
High Predation ◽  
Ground Nesting ◽  
Predation Rates

Ground-nesting birds typically experience high predation rates on their nests, often by mammalian predators. As such, researchers and wildlife managers have employed numerous techniques to mitigate nest predation. We investigated the use of scents as repellents to deter predators from both artificial and natural ground nests. Survival rates of artificial nests did not differ among six groups of substances (Wald ?2 df = 5 = 4.53, P < 0.48); however the chronology of predation among groups differed. A commercial Coyote urine based deterrent (DEER-D-TERTM), human hair, and Worcestershire sauce were depredated faster than the control (F4,5 = 40.3, P < 0.001). Nest survival of natural nests differed among those groups tested (Wald ?2 df = 2 = 11.8, P < 0.005); the eight mothball treatment decreased survival (Wald ?2 df = 1 = 11.5, P < 0.005), which indicated that novel smells may attract predators or result in duck nest abandonment when coupled with natural duck scent. Chronologies of predation events among treatment groups were not different for natural nests (F2,3 = 1.9, P = 0.22). These findings indicate an interaction between novel scents and predator olfactory cues.

scholarly journals Evidence for an Edge Effect on Avian Nest Predation in Fragmented Afromontane Forests in the Bamenda-Banso Highlands, NW Cameroon

2014 ◽  
Vol 7 (4) ◽  
pp. 720-732 ◽  
Author(s):  
Ondřej Sedláček ◽  
Martin Mikeš ◽  
Tomáš Albrecht ◽  
Jiří Reif ◽  
David Hořák
Keyword(s):  
Edge Effect ◽  
Nest Predation ◽  
Afromontane Forests ◽  
Avian Nest
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