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A test of the importance of direct and indirect fitness benefits for helping decisions in western bluebirds

Dickinson, Janis L. - In: Behavioral Ecology 15 (2004) 2, pp. 233-238

. Helpers reduced their share of provisioning as they got older, so comparisons were restricted to groups with yearling helpers …In cooperative breeders, the extent to which helpers at the nest adjust their contributions in accordance with direct … mexicana, helpers were exclusively male and helped at nests of both parents, a parent and stepparent, or a brother and …

Persistent link: https://www.econbiz.de/10008581925

Helping effort in a dominance hierarchy

Cant, Michael A.; Field, Jeremy - In: Behavioral Ecology 16 (2005) 4, pp. 708-715

In many cooperatively breeding species, group members form a dominance hierarchy or queue to inherit the position of breeder. Models aimed at understanding individual variation in helping behavior, however, rarely take into account the effect of dominance rank on expected future reproductive...

Persistent link: https://www.econbiz.de/10008581776

Male reed buntings do not adjust parental effort in relation to extrapair paternity

Bouwman, Karen M.; C(Kate). M. Lessells; Komdeur, Jan - In: Behavioral Ecology 16 (2005) 3, pp. 499-506

related and unrelated nestlings and direct provisioning to kin when paternity is in doubt. Reed buntings (Emberiza schoeniclus … in paternal care (incubation and provisioning nestlings) in relation to decreased paternity. We also assess whether males … bias their provisioning toward kin. We measured incubation time, provisioning rates, and food allocation to individual …

Persistent link: https://www.econbiz.de/10008581363

Helpers increase long-term but not short-term productivity in cooperatively breeding long-tailed tits

Hatchwell, Ben J.; Russell, Andrew F.; MacColl, Andrew D.C. - In: Behavioral Ecology 15 (2004) 1, pp. 1-10

another pair provision their offspring. About half of all broods had one or more helpers, 86% of which were male. Provisioning …Helpers at the nest in the cooperative breeding system of long-tailed tits Aegithalos caudatus exhibit kin preference … in their helping behavior. The aim of this study was to use multivariate analyses to investigate whether helpers accrue …

Persistent link: https://www.econbiz.de/10008581490

Provisioning in wild golden lion tamarins (Leontopithecus rosalia): benefits to omnivorous young

Rapaport, Lisa G. - In: Behavioral Ecology 17 (2006) 2, pp. 212-221

Provisioning may act to cushion weaned young from dietary insufficiency and errors during the period in which they are … tamarins 11--56 weeks of age in six groups to evaluate hypotheses regarding the functions of provisioning. All members …

Persistent link: https://www.econbiz.de/10008581566

Constraints on control: factors influencing reproductive success in male mandrills (Mandrillus sphinx)

Charpentier, Marie; Peignot, Patricia; Hossaert-McKey, … - In: Behavioral Ecology 16 (2005) 3, pp. 614-623

Over the last decade, paternity analysis using molecular markers has revealed that observed mating systems do not necessarily correlate with reproductive systems and thus cannot provide reliable information about male reproductive success (RS). This is especially true for primate species with a...

Persistent link: https://www.econbiz.de/10008581717

Nestmate recognition in the unicolonial ant Formica paralugubris

Chapuisat, Michel; Bernasconi, Christian; Hoehn, Sophie; … - In: Behavioral Ecology 16 (2005) 1, pp. 15-19

In unicolonial populations of ants, individuals can mix freely within large networks of nests that contain many queens. It has been proposed that the absence of aggression in unicolonial populations stems from a loss of nest mate recognition, but few studies have tested this hypothesis. We...

Persistent link: https://www.econbiz.de/10008581841

No evidence for inbreeding avoidance in a great reed warbler population

Hansson, Bengt; Jack, Lucy; Christians, Julian K.; … - In: Behavioral Ecology 18 (2007) 1, pp. 157-164

Inbreeding depression may drive the evolution of inbreeding avoidance through dispersal and mate choice. In birds, many species show female-biased dispersal, which is an effective inbreeding avoidance mechanism. In contrast, there is scarce evidence in birds for kin discriminative mate choice,...

Persistent link: https://www.econbiz.de/10008581856

Lack of inbreeding avoidance in the Argentine ant Linepithema humile

Keller, Laurent - In: Behavioral Ecology 13 (2002) 1, pp. 28-31

nepotism generally does not occur within colonies of social insects. It has been suggested that this may be due to the cost of …

Persistent link: https://www.econbiz.de/10008581893

Testis size depends on social status and the presence of male helpers in the cooperatively breeding cichlid Julidochromis ornatus

Awata, Satoshi; Heg, Dik; Munehara, Hiroyuki; Kohda, … - In: Behavioral Ecology 17 (2006) 3, pp. 372-379

Cooperatively breeding animals, in which helpers may participate in reproduction with dominant breeders, are ideal … cooperatively breeding system, in which some males mate monogamously and other males reproduce as dominant breeders or helpers … within cooperatively breeding groups, in which male helpers frequently sire young. We examined the relationship between …

Persistent link: https://www.econbiz.de/10008581312