26. Cowbird Parasitism and Nest Predation in Fragmented Grasslands of Southwestern Manitoba

2000 ◽  
pp. 220-228
Author(s):  
Stephen K. Davis ◽  
Spencer G. Sealy
Keyword(s):  
Nest Predation ◽  
Cowbird Parasitism

Nest Predation and Cowbird Parasitism Create a Demographic Sink in Wetland-Breeding Song Sparrows

The Condor ◽  
1997 ◽  
Vol 99 (3) ◽  
pp. 622-633 ◽  
Author(s):  
Christopher M. Rogers ◽  
Mary J. Taitt ◽  
Gwen Jongejan
Keyword(s):  
Nest Predation ◽  
Song Sparrows ◽  
Cowbird Parasitism

scholarly journals First Evidence of Conspecific Brood Parasitism and Egg Ejection in Song Sparrows, With Comments on Methods Sufficient to Document These

The Condor ◽  
2006 ◽  
Vol 108 (2) ◽  
pp. 452-458
Author(s):  
Quresh S. Latif ◽  
J. Letitia Grenier ◽  
Sacha K. Heath ◽  
Grant Ballard ◽  
Mark E. Hauber
Keyword(s):  
Genetic Analysis ◽  
Brood Parasitism ◽  
Nest Predation ◽  
Molothrus Ater ◽  
Separate Study ◽  
Conspecific Brood Parasitism ◽  
Egg Ejection ◽  
Song Sparrows ◽  
Cowbird Parasitism ◽  
Egg Marking

Abstract Conspecific brood parasitism occurs in many songbird species but has not been reported in Song Sparrows (Melospiza melodia). In three separate study areas where breeding Song Sparrows experience heavy nest predation pressure and Brown-headed Cowbird (Molothrus ater) parasitism, we observed six instances in which newly laid eggs were attributable to female Song Sparrows other than the nest owners. We also recorded the ejection of a sparrow egg from each of two videotaped nests. In a fourth study area without cowbird parasitism, genetic analysis of parentage revealed no conspecific brood parasitism. Given that egg ejection can accompany conspecific parasitism in Song Sparrows, we suggest that daily nest checks are insufficient to document the frequency of this tactic in some species in the absence of egg marking, videotaping, or genetic analyses. Since standard nest monitoring techniques may fail to detect conspecific brood parasitism, this behavior could be more prevalent than currently thought.

Relationship Between Nest Predation Suffered by Hosts and Brown-Headed Cowbird Parasitism: A Comparative Study

2006 ◽  
Vol 20 (2) ◽  
pp. 97-111 ◽  
Author(s):  
Jesús M. Avilés ◽  
Bård G. Stokke ◽  
Deseada Parejo
Keyword(s):  
Comparative Study ◽  
Nest Predation ◽  
Cowbird Parasitism

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
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