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Showing 1 to 20 of 23 for “"cooperative breeding"”.
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Maternal investment tactics in cooperative breeding systems
… carer contributions within a single stage of a breeding attempt, neglecting the potential for investment during earlier stages to influence later care decisions. Typically, mothers have much greater control than other carers over the number and quality of offspring, and hence by altering her …
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Cooperative breeding in the skuas of the Chatham Islands
Cooperative breeding, widely reported in birds, is found in <1–5% of territories in some populations of the Brown skua, Catharacta lonnbergi. In the New Zealand region, up to 30-50% of skua territories may be occupied by trios or larger groups. This study examines its occurrence at the Chatham …
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Life-history evolution and cooperative breeding in the sociable weaver
… of 'southern' birds is a higher frequency of cooperatively-breeding species. It has previously been shown that cooperative breeding is most frequent amongst species with high survival and low fecundity. An explanation for this could be that long occupancy of territories by long-lived breeders …
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Cooperative breeding and delayed dispersal in the Pale chanting goshawk, Melierax canorus
… the population to delay dispersal and become non-breeding or co-breeding members of Pale Chanting Goshawk families, and to determine why cobreeders breed cooperatively in polyandrous trios. In all vegetation types within the study area, non-breeders, as juvenile and adult offspring, delayed …
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The importance of a double standard : inter sexual differences and cooperative breeding in the green Woodhoopoe
… interpretation of evolutionary patterns among cooperative species. First, the reproductive costs of delaying reproduction may not be as high as previously assumed in some cooperative species if, as in females of this species, birds delaying breeding tend to live longer than birds reproducing at …
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The Behavioral Ecology and Conservation of an Australian Passerine, the Brown Treecreeper (Climacteris picumnus)
… I addressed concerns the maintenance of avian cooperative breeding. The most widely accepted models to explain cooperative breeding suggest that individuals that delay dispersal obtain a payoff under conditions in which the quality of breeding positions varies greatly. These models arose …
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Individual contributions to group behaviour in the cooperatively breeding southern ground-hornbill Bucorvus leadbeateri
Cooperative breeding, in which individuals other than breeders contribute to raising offspring, has been the focus of much scientific research over the past decades. Why do some individuals help to raise offspring that are not their own? In birds, cooperative breeding is found mainly in harsh …
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Kinship and its consequences in the cooperatively breeding southern pied babbler Turdoides bicolor
Cooperative breeding occurs when more than two individuals help to raise offspring that are not their own, and has been the focus of empirical and theoretical research for over forty years. Of central importance to this work are the fitness costs and benefits of helping, and the factors limiting …
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Frontline interactions between avian interspecific brood parasites and their hosts
… brood parasites and hosts. Chapters 3-5 use the cooperatively breeding superb fairy-wren, Malurus cyaneus, one of the primary hosts of the Horsfield's bronze-cuckoo, Chalcites basalis, as a model species to investigate frontline defences in hosts. I show that recognition of adult brood parasites …
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Frontline interactions between avian interspecific brood parasites and their hosts
… brood parasites and hosts. Chapters 3-5 use the cooperatively breeding superb fairy-wren, Malurus cyaneus, one of the primary hosts of the Horsfield's bronze-cuckoo, Chalcites basalis, as a model species to investigate frontline defences in hosts. I show that recognition of adult brood parasites …
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The Life History of Damaraland Mole-rats Fukomys damarensis: Growth, Ageing and Behaviour
… presence of behavioural specialisation in non-breeding mole-rat helpers. I find no indication of individual specialisation in cooperative activities. Instead, individual differences in helping behaviour are largely the result of age-related changes in the extent to which individuals commit to …
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Population Dynamics and Dispersal Coalitions in the Cooperatively Breeding Acorn Woodpecker
… and dispersal coalitions in a population of cooperatively breeding acorn woodpeckers in central California, USA. Using a 34-year dataset on occupancy and abundance, I determined that increases in abundance were determined by dispersal to new locations. This resulted in increased occupancy, …
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Know your place - Social network analysis in cooperatively breeding white-winged choughs (Corcorax melanorhamphos)
Cooperative breeding is a specialised type of social system in which individuals work together as a group to raise young. This breeding system entails variable costs and benefits for individuals based on their position in group social structure. Social network analysis has become an important tool …
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Know your place - Social network analysis in cooperatively breeding white-winged choughs (Corcorax melanorhamphos)
Cooperative breeding is a specialised type of social system in which individuals work together as a group to raise young. This breeding system entails variable costs and benefits for individuals based on their position in group social structure. Social network analysis has become an important tool …
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Ultimate and Proximate Explanations of Helping Behavior in the Red-cockaded Woodpecker (Picoides borealis)
One unresolved issue in the study of cooperative breeding is why individuals that delay their own reproduction assist others in raising young. Red-cockaded woodpecker helpers may again future indirect fitness benefits by increasing survival of breeders, who produce offspring related to the helper …
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Mister Parid's Neighborhood: Dispersal Behavior and Flocking Dynamics of the Social Black-crested Titmouse (Baeolophus atricristatus)
… an average 3.4 ha (p < 0.01) between the breeding season (March-July) and the non- breeding season (August – February). Juvenile BCTI that delayed their dispersal often establish territories adjacent to their parents the following year, thus creating kin- structured neighborhoods. Social …
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Polymorphic social organisation in a eusocial insect : the ultimate and proximate causes
A fundamental variable in cooperative breeding animal species is the degree to which reproduction is partitioned among group members - termed reproductive skew. Understanding the causes for variation in skew contributes to our understanding of social evolution because skew directly impacts on the …
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Can sociality buffer the impacts of climate change on a cooperatively-breeding bird, the southern pied babbler Turdoides bicolor?
… are disproportionately more likely to engage in cooperative breeding implies that this strategy may buffer individuals against the negative effects of adverse climate conditions. An aspect of species' vulnerability to climate change that remains relatively unexplored is whether responses to …
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Hormones and cooperative behaviours in the Damaraland mole-rat (Fukomys damarensis)
Large individual differences in cooperative contributions are common within animal societies such as cooperative breeders, where helpers care for offspring which are not their own. Understanding this variation has been a major focus in behavioural ecology and while evidence has shown that …
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Stress in the Red-cockaded Woodpecker: Hormonal Mechanisms of Reproductive Suppression in Helper Males and Impacts of Military Training Activities
… and reproductive hormone levels between breeding males and helper males to examine hormonal mechanisms of reproductive suppression in helper males. No hormonal differences existed between breeding and helper males. However, baseline corticosterone levels were lower in all males living in …
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