scholarly journals Local density regulates migratory songbird reproductive success through effects on double-brooding and nest predation

Ecology ◽  
2017 ◽  
Vol 98 (8) ◽  
pp. 2039-2048 ◽  
Author(s):  
Bradley K. Woodworth ◽  
Nathaniel T. Wheelwright ◽  
Amy E. M. Newman ◽  
D. Ryan Norris
Keyword(s):  
Reproductive Success ◽  
Nest Predation ◽  
Local Density ◽  
Double Brooding ◽  
Migratory Songbird

scholarly journals The influence of subcolony-scale nesting habitat on the reproductive success of Adélie penguins

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Annie E. Schmidt ◽  
Grant Ballard ◽  
Amélie Lescroël ◽  
Katie M. Dugger ◽  
Dennis Jongsomjit ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Colony Size ◽  
Nest Predation ◽  
Size Variation ◽  
Area Ratio ◽  
Slope Aspect ◽  
Nesting Habitat ◽  
Terrain Attributes ◽  
Small Colony ◽  
Adélie Penguins

AbstractGroup-size variation is common in colonially breeding species, including seabirds, whose breeding colonies can vary in size by several orders of magnitude. Seabirds are some of the most threatened marine taxa and understanding the drivers of colony size variation is more important than ever. Reproductive success is an important demographic parameter that can impact colony size, and it varies in association with a number of factors, including nesting habitat quality. Within colonies, seabirds often aggregate into distinct groups or subcolonies that may vary in quality. We used data from two colonies of Adélie penguins 73 km apart on Ross Island, Antarctica, one large and one small to investigate (1) How subcolony habitat characteristics influence reproductive success and (2) How these relationships differ at a small (Cape Royds) and large (Cape Crozier) colony with different terrain characteristics. Subcolonies were characterized using terrain attributes (elevation, slope aspect, slope steepness, wind shelter, flow accumulation), as well group characteristics (area/size, perimeter-to-area ratio, and proximity to nest predators). Reproductive success was higher and less variable at the larger colony while subcolony characteristics explained more of the variance in reproductive success at the small colony. The most important variable influencing subcolony quality at both colonies was perimeter-to-area ratio, likely reflecting the importance of nest predation by south polar skuas along subcolony edges. The small colony contained a higher proportion of edge nests thus higher potential impact from skua nest predation. Stochastic environmental events may facilitate smaller colonies becoming “trapped” by nest predation: a rapid decline in the number of breeding individuals may increase the proportion of edge nests, leading to higher relative nest predation and hindering population recovery. Several terrain covariates were retained in the final models but which variables, the shapes of the relationships, and importance varied between colonies.

scholarly journals Warm Springs, Early Lay Dates, and Double Brooding in a North American Migratory Songbird, the Black-Throated Blue Warbler

PLoS ONE ◽  
2013 ◽  
Vol 8 (4) ◽  
pp. e59467 ◽  
Author(s):  
Andrea K. Townsend ◽  
T. Scott Sillett ◽  
Nina K. Lany ◽  
Sara A. Kaiser ◽  
Nicholas L. Rodenhouse ◽  
...  
Keyword(s):  
North American ◽  
Double Brooding ◽  
Warm Springs ◽  
Migratory Songbird

scholarly journals There goes the neighborhood: White-crowned Sparrow nest site selection and reproductive success as local density declines

The Condor ◽  
2018 ◽  
Vol 120 (1) ◽  
pp. 234-244 ◽  
Author(s):  
Elizabeth L. Porzig ◽  
Nathaniel E. Seavy ◽  
John M. Eadie ◽  
Thomas Gardali ◽  
Diana L. Humple ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Site Selection ◽  
Nest Site ◽  
Local Density ◽  
Nest Site Selection

scholarly journals Nesting With The Wasp Ropalidia Cincta Increases Nest Success of Red-Cheeked Cordonbleu (Uraeginthus Bengalus) in Ghana

The Auk ◽  
2006 ◽  
Vol 123 (4) ◽  
pp. 1022-1037 ◽  
Author(s):  
Paul Beier ◽  
Agba Issahaku Tungbani
Keyword(s):  
Reproductive Success ◽  
Nest Predation ◽  
Northern Ghana ◽  
Social Hymenoptera ◽  
Tropical Regions ◽  
Nest Sites ◽  
Wasp Nests ◽  
Habitat Feature ◽  
Working Hypotheses ◽  
Rule Out

AbstractAssociations between birds and social Hymenoptera (ants, wasps, bees) are common in tropical regions and are usually assumed to be commensal relationships that benefit birds but neither help nor harm the arthropods. However, benefits to birds have been documented in only four such associations, and no previous research has rigorously investigated costs or benefits to associated hymenopterans. We followed the nesting cycles of an estrildid finch, the Red-cheeked Cordonbleu (Uraeginthus bengalus), and a common nesting associate, the wasp Ropalidia cincta, during 2002 and 2003 in northern Ghana to compare reproductive success of birds and wasps nesting in association with that of birds and wasps nesting separately. Red-cheeked Cordonbleus and wasps nested together in the same tree 3.7 × as often as expected if nesting decisions were made independently, with 74% of bird nests and 74% of wasp colonies occurring in associations. Bird nesting was initiated ≈33 days after founding of an associated wasp colony; bird nests and wasp colonies were, on average, 42 cm apart. In both years, Red-cheeked Cordonbleus in nesting associations with wasps were twice as likely to fledge young as birds nesting in trees without wasps. Reduced predation was apparently a major reason for increased fledging success: we documented four cases of nest predation on 122 Red-cheeked Cordonbleu nests associated with wasps, and 11 cases on 90 nests not associated with wasps. Association with birds did not affect the success of wasp colonies. Although our observational study cannot rule out the possibility that both species coincidentally shared a preference for a habitat feature in limited supply, suitable nest sites did not appear to be limiting (74% of potential nest trees had neither bird nor wasp nests). Reproductive success of Red-cheeked Cordonbleu populations in this region may be limited by the number of available wasp colonies. By designing our study to address four working hypotheses (commensalism, mutualism, parasitism, coincidence of habitat preference), we have provided strong evidence that this relationship is commensal.Augmentation du Succès de Nidification de Uraeginthus bengalus Nichant avec des Guêpes Ropalidia cincta au Ghana

Nest Predation May Not Explain Poor Reproductive Success of Polygynously Mated Female Tengmalm's Owls

1994 ◽  
Vol 25 (2) ◽  
pp. 161 ◽  
Author(s):  
Erkki Korpimaki
Keyword(s):  
Reproductive Success ◽  
Nest Predation ◽  
Mated Female

Density-Dependent Reproductive Success Is Mediated by Nest Predation in Black-Billed Magpies (Pica pica)

Bird Behavior ◽  
1996 ◽  
Vol 11 (1) ◽  
pp. 9-15
Author(s):  
Eric Stone ◽  
Charles H. Trost
Keyword(s):  
Reproductive Success ◽  
Nest Predation ◽  
Pica Pica ◽  
Density Dependent

scholarly journals ENSO, Nest Predation Risk, Food Abundance, and Male Status Fail to Explain Annual Variations in the Apparent Survival Rate of a Migratory Songbird

PLoS ONE ◽  
2014 ◽  
Vol 9 (11) ◽  
pp. e113844 ◽  
Author(s):  
Alizée Vernouillet ◽  
Marc-André Villard ◽  
Samuel Haché
Keyword(s):  
Survival Rate ◽  
Predation Risk ◽  
Nest Predation ◽  
Food Abundance ◽  
Apparent Survival ◽  
Annual Variations ◽  
Migratory Songbird

The Relationships Among Population Density, Individual Size, Mating Tactics, and Reproductive Success in a Hermaphroditic Fish, Serranus Fasciatus

Behaviour ◽  
1990 ◽  
Vol 113 (1-2) ◽  
pp. 57-80 ◽  
Author(s):  
Christopher W. Petersen
Keyword(s):  
Reproductive Success ◽  
Social Group ◽  
Local Density ◽  
Social Systems ◽  
Male Reproductive Success ◽  
Male Mating ◽  
Mating Tactics ◽  
Intermediate Group ◽  
Female Function ◽  
Mating Opportunities

AbstractThe hermaphroditic reef fish Serranus fasciatus exhibits three types of social systems. The size of a social group is correlated with the local density of conspecifics. At very low densities, isolated pairs of individuals reciprocally spawn with each other, achieving equal current reproductive success. At intermediate group sizes, harems form, with the largest individual typically losing all of its female function and becoming a functional male. In harems, subordinate hermaphrodites obtain little male reproductive success through streaking, an alternative male mating tactic. The lone pure male maintains almost total monopolization of male reproductive success in harems, apparently due to aggressive domination of subordinates. At high group sizes, the ability of the male to monopolize all of the matings in a social group decreases, and some of the larger hermaphrodites obtain some male-role reproductive success by pair spawning with smaller subordinate hermaphrodites while continuing to spawn as females with the male. Mating partners stay relatively constant through time, resulting in a pattern of small 'sub-harems' within harems. These mating tactics are consistent with the hypothesis that dominant individuals increase their current reproductive success in this species by restricting male mating opportunities of conspecifics. Subordinate individuals spawn as males when the dominant is unable to restrict interactions between hermaphrodites that are potential mates, or when they successfully streak. The increased male reproductive success of hermaphrodites in isolated pairs and complex harems compared with hermaphrodites in harems appears to be important in maintaining a hermaphroditic subordinate phenotype in this largely non-reciprocating species.

Invasion of an exotic forb impacts reproductive success and site fidelity of a migratory songbird

Oecologia ◽  
2006 ◽  
Vol 149 (2) ◽  
pp. 340-351 ◽  
Author(s):  
Yvette Katina Ortega ◽  
Kevin Scot McKelvey ◽  
Diana Lee Six
Keyword(s):  
Reproductive Success ◽  
Site Fidelity ◽  
Migratory Songbird
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