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154 results for “gregariousness”
Gregariousness, foraging effort, and social interactions in lactating bonobos and chimpanzees
<p>Fission-fusion dynamics have evolved in a broad range of animal taxa and are thought to allow individuals to mitigate feeding competition. While this is the principal benefit of fission-fusion, few studies have evaluated its costs. We compared gregariousness, foraging budgets, and social budgets between lactating bonobos and chimpanzees from wild populations to evaluate such costs. Both species exhibit fission-fusion dynamics, but chimpanzees, particularly in East African populations, appear to experience higher feeding competition than bonobos. We expected lactating chimpanzees to be less gregarious than lactating bonobos; reduced gregariousness should allow lactating chimpanzees to mitigate costs of higher feeding competition without requiring more foraging effort. However, we expected the reduced gregariousness of lactating chimpanzees to limit their time available for affiliative social interactions. Using long-term data from LuiKotale bonobos and Gombe chimpanzees, we found that lactating chimpanzees were indeed less gregarious than lactating bonobos while feeding and travel time did not differ between species. Contrary to our predictions, lactating females did not differ in social interaction time, and lactating chimpanzees spent proportionately more time interacting with individuals other than their immature offspring. Our results indicate that lactating chimpanzees can maintain social budgets comparable to lactating bonobos despite reduced gregariousness and without incurring additional foraging costs. We discuss potential explanations for why lactating bonobos are more gregarious.</p>
Data from: Stronger social bonds do not always predict greater longevity in a gregarious primate
In group-living species, individuals often have preferred affiliative social partners, with whom ties or bonds can confer advantages that correspond with greater fitness. For example, in adult female baboons and juvenile horses, individuals with stronger or more social ties experience greater survival. We used detailed behavioral and life history records to explore the relationship between tie quality and survival in a gregarious monkey (Cercopithecus mitis stuhlmanni), while controlling for dominance rank, group size, and life history strategy. We used Cox proportional hazards regressions to model the cumulative (multi-year) and current (single-year) relationships of social ties and the hazard of mortality in 83 wild adult females of known age, observed 2–8 years each (437 subject-years) in eight social groups. The strength of bonds with close partners was associated with increased mortality risk under certain conditions: Females that had strong bonds with close partners that were inconsistent over multiple years had a higher risk of mortality than females adopting any other social strategy. Within a given year, females had a higher risk of death if they were strongly bonded with partners that changed from the previous year versus with partners that remained consistent. Dominance rank, number of adult female groupmates, and age at first reproduction did not predict the risk of death. This study demonstrates that costs and benefits of strong social bonds can be context-dependent, relating to the consistency of social partners over time.
Data from: Space use and social association in a gregarious ungulate: testing the conspecific attraction and resource dispersion hypotheses
Animals use a variety of proximate cues to assess habitat quality when resources vary spatiotemporally. Two nonmutually exclusive strategies to assess habitat quality involve either direct assessment of landscape features or observation of social cues from conspecifics as a form of information transfer about forage resources. The conspecific attraction hypothesis proposes that individual space use is dependent on the distribution of conspecifics rather than the location of resource patches, whereas the resource dispersion hypothesis proposes that individual space use and social association are driven by the abundance and distribution of resources. We tested the conspecific attraction and the resource dispersion hypotheses as two nonmutually exclusive hypotheses explaining social association and of adult female caribou (Rangifer tarandus). We used location data from GPS collars to estimate interannual site fidelity and networks representing home range overlap and social associations among individual caribou. We found that home range overlap and social associations were correlated with resource distribution in summer and conspecific attraction in winter. In summer, when resources were distributed relatively homogeneously, interannual site fidelity was high and home range overlap and social associations were low. Conversely, in winter when resources were distributed relatively heterogeneously, interannual site fidelity was low and home range overlap and social associations were high. As access to resources changes across seasons, caribou appear to alter social behavior and space use. In summer, caribou may use cues associated with the distribution of forage, and in winter caribou may use cues from conspecifics to access forage. Our results have broad implications for our understanding of caribou socioecology, suggesting that caribou use season‐specific strategies to locate forage. Caribou populations continue to decline globally, and our finding that conspecific attraction is likely related to access to forage suggests that further fragmentation of caribou habitat could limit social association among caribou, particularly in winter when access to resources may be limited.
Data from: Temperature, size, reproductive allocation, and life-history evolution in a gregarious caterpillar
The present study aimed to investigate the relation between growth rate, final mass and larval development, and how this relations influence the reproductive trade-offs in the context of a gregarious life-style and the need to keep an optimal group size. We use as model two sympatric populations of the pine processionary moth Thaumetopoea pityocampa, occurring in different seasons and thus experiencing different climatic conditions. T. pityocampa is a strictly gregarious caterpillar throughout the larval period, which occurs during winter in countries all over the Mediterranean Basin. However in 1997 a population, in which larval development occurs during the summer, was discovered in Portugal, being called Summer Population SP, as opposed to the normal Winter Population WP, which coexists in the same forest feeding on the same host during the winter. Both this populations were monitored during three years, with assessment of the length of the larval period and its relation with different climatic variables, final mass and adult size, egg size and number, colony size, and mortality in different life stages. The SP larval period was reduced due to development in the warmer part of the year, however reaching the same final mass and adult size as the WP. In spite of equal size at maturity, a trade-off between egg size and number was found between the two populations: SP produced less but bigger eggs than WP. This is the opposite of what is generally found in other Lepidoptera species, where development in colder environments leads to larger eggs at the expense of fecundity, but corroborates the trend found at a macro-geographic scale for T. pityocampa, with females from northern latitudes and colder environment, producing more and smaller eggs. Results point to the importance of number of eggs in cold environments due to an advantage of large colonies when gregarious caterpillars develop in such environments, and are discussed according to the major theories regarding size in animals.
Data from: Moving on with foraging theory: incorporating movement decisions into the functional response of a gregarious shorebird
1. Models relating intake rate to food abundance and competitor densities (generalized functional response models) can predict forager distributions and movements between patches, but we lack understanding of how distributions and small-scale movements by the foragers themselves affect intake rates. 2. Using a state-of-the-art approach based on continuous-time Markov chain dynamics, we add realism to classic functional response models by acknowledging that the chances to encounter food and competitors are influenced by movement decisions, and, vice versa, that movement decisions are influenced by these encounters. 3. We used a multi-state modelling framework to construct a stochastic functional response model in which foragers alternate between three behavioural states: searching, handling and moving. 4. Using behavioural observations on a molluscivore migrant shorebird (red knot, Calidris canutus canutus), at its main wintering area (Banc d'Arguin, Mauritania), we estimated transition rates between foraging states as a function of conspecific densities and densities of the two main bivalve prey. 5. Intake rate decreased with conspecific density. This interference effect was not due to decreased searching efficiency, but resulted from time lost to avoidance movements. 6. Red knots showed a strong functional response to one prey (Dosinia isocardia), but a weak response to the other prey (Loripes lucinalis). This corroborates predictions from a recently developed optimal diet model that accounts for the mildly toxic effects due to consuming Loripes. 7. Using model-averaging across the most plausible multi-state models, the fully parameterized functional response model was then used to predict intake rate for an independent dataset on habitat choice by red knot. 8. Comparison of the sites selected by red knots with random sampling sites showed that the birds fed at sites with higher than average Loripes and Dosinia densities, i.e. sites for which we predicted higher than average intake rates. 9. We discuss the limitations of Holling's classical functional response model that ignores movement and the limitations of contemporary movement ecological theory ignoring consumer-resource interactions. With the rapid advancement of technologies to track movements of individual foragers at fine spatial scales, the time seems ripe to integrate descriptive tracking studies with stochastic movement-based functional response models.
Data from: Contagious fear: escape behaviour increases with flock size in European gregarious birds
Flight initiation distance (FID), the distance at which individuals take flight when approached by a potential (human) predator, is a tool for understanding predator-prey interactions. Among the factors affecting FID, tests of effects of group size (i.e. number of potential prey) on FID have yielded contrasting results. Group size or flock size could either affect FID negatively (i.e. the dilution effect caused by the presence of many individuals) or positively (i.e. increased vigilance due to more eyes scanning for predators). These effects may be associated with gregarious species, because such species should be better adapted to exploiting information from other individuals in the group than non-gregarious species. Sociality may explain why earlier findings on group size vs. FID have yielded different conclusions. Here, we analyzed how flock size affected bird FID in eight European countries. A phylogenetic generalized least square regression model was used to investigate changes in escape behavior of bird species in relation to number of individuals in the flock, starting distance, diet, latitude and type of habitat. Flock size of different bird species influenced how species responded to perceived threats. We found that gregarious birds reacted to a potential predator earlier (longer flight initiation distance) when aggregated in large flocks. These results support a higher vigilance arising from many eyes scanning in birds, suggesting that sociality may be a key factor in the evolution of anti-predator behavior both in urban and rural areas. Finally, future studies comparing FID must pay explicit attention to the number of individuals in flocks of gregarious species.
FIGURE 6 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 6. Teresirogas billbrysoni gen. et. sp. nov. A, fore wing; B, head and anterior of mesosoma, lateral view; C, propodeum, metasoma, mid- and hind legs, lateral view; D, propodeum and metasomal tergites 1 and 2, dorsal view.
FIGURE 7 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 7. Teresirogas nolani gen. et. sp. nov. A, habitus; B, head, front view; C, head and mesosoma, lateral view; D, head dorsal view; E, F, views of hind telotarsus and claw showing reduced basal lobe.
FIGURE 5 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 5. Teresirogas billbrysoni gen. et. sp. nov. A, habitus; B, head (female), front view; C, head (male), front view; D, head (female), dorsal view.
FIGURE 10 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 10. Teresirogas prestonae gen. et. sp. nov. A, fore wing; B, hind leg and mesosoma, lateral view; C, propodeum and metasomal tergites 1–4, dorsal view.
FIGURE 3 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 3. Teresirogas australicolorus gen. et. sp. nov. A, head dorsal view; B, head and mesosoma, lateral view; C, mesosoma, except anterior part, dorsal view; D, metasoma, dorsal view.
FIGURE 12 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 12. Teresirogas williamsi gen. et. sp. nov. A, fore wing; B, posterior of mesosoma and anterior of metasoma, dorsal view; C, metasomal tergites 2 and following, dorsal view.
FIGURE 11 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 11. Teresirogas williamsi gen. et. sp. nov. A, habitus; B, hind leg; C, head, front view; D, head, lateral view; E, head, dorsal view.
FIGURE 9 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 9. Teresirogas prestonae gen. et. sp. nov. A, habitus; B, head, dorsal view; C, mesoscutum, dorsal view; D, head, front view.
FIGURE 8 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 8. Teresirogas nolani gen. et. sp. nov. A, posterior of mesosoma and metasomal tergite 1, lateral view; B, scutellum, propodeum, tergite 1, dorsal view; C, wings; D, wings, detail of subdiscal cell.
FIGURE 4 in A new Australian genus and five new species of Rogadinae (Hymenoptera: Braconidae), one reared as a gregarious endoparasitoid of an unidentified limacodid (Lepidoptera)
FIGURE 4. Teresirogas australicolorus gen. et. sp. nov. A, hind leg and middle and hind claws showing pointed basal lobes; B, wings; C, mummified prepupal host remains, note incompletely emerged wasp, upper right.
FIGURE 5 in Biology and description of Megaprosternum cleonarovorum sp. nov. (Hymenoptera: Bethylidae) a gregarious larval ectoparasitoid of Cleonaria bicolor Thomson (Coleoptera: Cerambycidae) from India
FIGURE 5. Megaprosternum cleonarovorum sp. nov., female. A, head in lateral view; B and C, head in dorsal view; D, head and prothorax in ventral view; E, mesosoma and front leg in lateral view; F, mesosoma in dorsal view; G, wings in dorsal view; H, metasoma in dorsal view.
FIGURE 8 in Biology and description of Megaprosternum cleonarovorum sp. nov. (Hymenoptera: Bethylidae) a gregarious larval ectoparasitoid of Cleonaria bicolor Thomson (Coleoptera: Cerambycidae) from India
FIGURE 8. Life stages of M. cleonarovorum sp. nov. on Cleonaria bicolor grub. A and B, eggs on host grub; C, early instars; D, late instars; E, initiation of spinning; F, half spun cocoons; G, freshly formed cocoons; H, dark coloured cocoons just before emergence with guarding female.
FIGURE 2 in Biology and description of Megaprosternum cleonarovorum sp. nov. (Hymenoptera: Bethylidae) a gregarious larval ectoparasitoid of Cleonaria bicolor Thomson (Coleoptera: Cerambycidae) from India
FIGURE 2. Megaprosternum cleonarovorum sp. nov., male. A, head in dorsal view (paratype); B. head and antennae (holotype in frontal view); C, head and prothorax in ventral view (paratype); D, mesosoma in dorsal view (paratype); E. wings in dorsal view (paratype); F. metasoma in dorsal view (paratype).
FIGURE 1 in Biology and description of Megaprosternum cleonarovorum sp. nov. (Hymenoptera: Bethylidae) a gregarious larval ectoparasitoid of Cleonaria bicolor Thomson (Coleoptera: Cerambycidae) from India
FIGURE 1. Megaprosternum cleonarovorum sp. nov., male. A, habitus in dorsal view (paratype); B. habitus in lateral view (holotype).
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Allen Brain Atlas
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