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86 results for “Nest structure”
Fig. 1 in Diversity And Structure Of Nesting Birds In The Coastal Riparian Zones Of Great Kabylia In Algeria
Fig. 1. Geographical Location of the Study Sites.
The role of a synanthropic bird in the nest niche expansion of a secondary cavity-nester to man-made structures
<p><span>Species with similar ecological characters often compete with each other; however, a species may also facilitate the survival or reproduction of another ecologically similar species although such interaction is rarely documented in birds. Here we reported a facilitative species interaction between Asian house martins (<em>Delichon dasypus</em>) and russet sparrows (<em>Passer cinnamomeus</em>), both passerines using closed nests, in a montane farming area of Taiwan. We found that Asian house martins constructed dome-shaped nests in human houses that provided additional nest sites for russet sparrows, secondary cavity-nesters with greatly declining populations in Taiwan. Russet sparrows that used house martin nests had reproductive success comparable to those that used artificial nest boxes. However, Asian house martins avoided reclaiming sparrow-used nests, which reduced their available nest sites. Interestingly, our results imply that man-made structures may be used as a conservation tool to improve the breeding of the endangered russet sparrows via this facilitative interaction.</span></p>
Data from: The socially parasitic ant Polyergus mexicanus has host-associated genetic population structure and related neighboring nests
<p>The genetic structure of populations can be both a cause and a consequence of ecological interactions. For parasites, genetic structure may be a consequence of preferences for host species or of mating behavior. Conversely, genetic structure can determine where conspecific interactions among parasites lay on a spectrum from cooperation to conflict. We used microsatellite loci to characterize the genetic structure of a population of the socially parasitic dulotic (aka "slave-making") ant (<i>Polyergus mexicanus</i>), which is known for its host-specificity and conspecific aggression. First, we assessed whether the pattern of host species use by the parasite has influenced parasite population structure. We found that host species use was correlated with subpopulation structure, but this correlation was imperfect: some subpopulations used one host species exclusively, while others used several. Second, we examined the viscosity of the parasite population by measuring the relatedness of pairs of neighboring parasitic ant nests at varying distances from each other. Although natural history observations of local dispersal by queens suggested the potential for viscosity, there was no strong correlation between relatedness and distance between nests. However, 35% of nests had a closely related neighboring nest, indicating that kinship could potentially affect the nature of some interactions between nests of this social parasite. Our findings confirm that ecological forces like host species selection can shape the genetic structure of parasite populations, and that such genetic structure has the potential to influence parasite-parasite interactions in social parasites via inclusive fitness.</p>
Convergent evolution of elaborate nests as structural defences in birds
The pendent nests of some weaverbird and icterid species are among the most complex structures built by any animal, but why they have evolved remains to be explained. The precarious attachments and extended entrance tunnels characteristic of these nests are widely speculated to act as structural defences against invasion by nest predators, particularly tree-climbing snakes, but this hypothesis has yet to be systematically tested. We use phylogenetic comparative methods to investigate the relationship between nest structure and developmental period length, a proxy for offspring mortality, in weaverbirds (Ploceidae) and icterids (Icteridae), two bird families in which highly elaborate pendent nests have independently evolved. We find that more elaborate nests, particularly those with entrance tunnels, are associated with longer developmental periods in both families. This finding is robust to potentially confounding effects of body mass, phylogenetic relationships, nest location and latitude. Our results are consistent with the hypothesis that elaborate nest structures in birds can function as structural defences, resulting in lower offspring mortality and slower development. More generally, our findings suggest that constructing complex, protective structures may buffer against environmental hazards, reducing extrinsic mortality and contributing to the evolution of slower life histories in diverse animal lineages, even humans.
Eusocial evolution without a nest: kin structure of social aphids forming open colonies on bamboo
<p><span>Living in nests is an almost universal feature of eusocial animals. In some aphids, however, sterile soldier castes have evolved in open colonies without a nest. To clarify the factors promoting the evolution of eusociality in these colonies, we used newly developed microsatellite markers to compare the kin structure of the open colonies of two aphid species on bamboo: the non-eusocial colonies of <em>Astegopteryx bambucifoliae</em> and the eusocial colonies of <em>Pseudoregma alexanderi</em>on <em>Dendrocalamus latiflorus</em>. </span><br><br><span>Our samples, from over 1,000 hectares, contained 99 clones of <em>A. bambucifoliae</em> and 19 of <em>P. alexanderi</em>. Clonal mixing occurred in both species: average pairwise relatedness within a colony was 0.54 in <em>A. bambucifoliae</em> and 0.71 in <em>P. alexanderi</em>. Each clone of <em>A. bambucifoliae</em> occurred in a unique location, whereas those of <em>P. alexander</em>i occurred in multiple locations and more than 90% of individuals came from just four clones. There was significant genetic variation among different colonies in the same clu</span><span>mp (stem-cluster)</span><span> in <em>A. bambucifoliae</em> but not in <em>P. alexanderi</em>, indicating that <em>P. alexanderi</em> colonies in a</span><span> single</span><span> clump are genetically homogenized, functioning as a large colony. In <em>P. alexanderi</em>, the proportion of sterile soldiers to normal first-instar nymphs was significantly different across the four clones. </span><br><br><span>Our results indicate that the lack of input of migrants from the primary host and feeding on a large, stable host plant are important ecological factors that might favour the evolution of eusociality, enabling the production of genetically homogenised, large, and long-lived colonies. After eusociality evolves on the secondary host, the optimal strategy of soldier production might vary between different clones.</span></p>
Data from: Fine-tuning the nested structure of pollination networks by adaptive interaction switching, biogeography and sampling effect in the Galápagos Islands
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Eusocial evolution without a nest: kin structure of social aphids forming open colonies on bamboo
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The role of a synanthropic bird in the nest niche expansion of a secondary cavity-nester to man-made structures
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Data from: Nest structure affects auditory and visual detectability, but not predation risk, in a tropical songbird community
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Parental effort in warming young: A neglected component of life history strategies influenced by nest structure, brood size, body mass, and bi-parental care
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How population structure and nest membership shape pathogen patterns in bumble bees?
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Data from: Habitat structure and an introduced predator limit the abundance of an endangered ground-nesting bird
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Convergent evolution of elaborate nests as structural defences in birds
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Data from: Social immunity in a supercolonial invasive ant: Nest structure confers immune function
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Data from: The socially parasitic ant Polyergus mexicanus has host-associated genetic population structure and related neighboring nests
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Data from: Modularity and connectivity of nest structure scale with colony size
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Data from: Non-nest mate discrimination and clonal colony structure in the parthenogenetic ant Cerapachys biroi
Understanding the interplay between cooperation and conflict in social groups is a major goal of biology. One important factor is genetic relatedness, and animal societies are usually composed of related but genetically different individuals, setting the stage for conflicts over reproductive allocation. Recently, however, it has been found that several ant species reproduce predominantly asexually. Although this can potentially give rise to clonal societies, in the few well-studied cases, colonies are often chimeric assemblies of different genotypes, due to worker drifting or colony fusion. In the ant Cerapachys biroi, queens are absent and all individuals reproduce via thelytokous parthenogenesis, making this species an ideal study system of asexual reproduction and its consequences for social dynamics. Here, we show that colonies in our study population on Okinawa, Japan, recognize and effectively discriminate against foreign workers, especially those from unrelated asexual lineages. In accord with this finding, colonies never contained more than a single asexual lineage and average pairwise genetic relatedness within colonies was extremely high (r = 0.99). This implies that the scope for social conflict in C. biroi is limited, with unusually high potential for cooperation and altruism.
Data from: Nest suitability, fine-scale population structure and male-mediated dispersal of a solitary ground nesting bee in an urban landscape
Bees are the primary pollinators of flowering plants in almost all ecosystems. Worldwide declines in bee populations have raised awareness about the importance of their ecological role in maintaining ecosystem functioning. The naturally strong philopatric behavior that some bee species show can be detrimental to population viability through increased probability of inbreeding. Furthermore, bee populations found in human-altered landscapes, such as urban areas, can experience lower levels of gene flow and effective population sizes, increasing potential for inbreeding depression in wild bee populations. In this study, we investigated the fine-scale population structure of the solitary bee Colletes inaequalis in an urbanized landscape. First, we developed a predictive spatial model to detect suitable nesting habitat for this ground nesting bee and to inform our field search for nests. We genotyped 18 microsatellites in 548 female individuals collected from nest aggregations throughout the study area. Genetic relatedness estimates revealed that genetic similarity among individuals was slightly greater within nest aggregations than among randomly chosen individuals. However, genetic structure among nest aggregations was low (Nei's GST = 0.011). Reconstruction of parental genotypes revealed greater genetic relatedness among females than among males within nest aggregations, suggesting male-mediated dispersal as a potentially important mechanism of population connectivity and inbreeding avoidance. Size of nesting patch was positively correlated with effective population size, but not with other estimators of genetic diversity. We detected a positive trend between geographic distance and genetic differentiation between nest aggregations. Our landscape genetic models suggest that increased urbanization is likely associated with higher levels of inbreeding. Overall, these findings emphasize the importance of density and distribution of suitable nesting patches for enhancing bee population abundance and connectivity in human dominated habitats and highlights the critical contribution of landscape genetic studies for enhanced conservation and management of native pollinators.
Data from: Tick infestation of chicks in a seabird colony varies with local breeding synchrony, local nest density and habitat structure
Parasites are a major risk for group-living animals and seabirds are notoriously susceptible to ectoparasite infestations because they commonly nest in dense colonies. Ticks parasitize seabirds across all biogeographical regions and they can be particularly harmful to nestlings, but the ecological factors that affect their transmission to chicks are little studied and poorly understood. Here we show that abundance of tick larvae in blue-footed booby (Sula nebouxii) broods varies with local nest synchrony and density, and also with habitat structure: abundance increased with local breeding synchrony, was linearly and quadratically related to local nest density, and was highest toward the southern end of the study area which has suitable (boulder-rich) habitat for ticks. Also, with increasing chick age infestation first increased and then declined. The results of this study highlight how local physical and social environmental factors influence infestation of seabird nestlings by ticks.
FIG. 4 in Nest-Site Fidelity and Sex-Biased Dispersal Affect Spatial Genetic Structure of Eastern Box Turtles (Terrapene carolina carolina) at Their Northern Range Edge
FIG. 4. Analysis of global structure along the river corridor from the first principal component of the sPCA represented by (A) interpolation of lagged principal scores showing genetic clines and (B) colors indicating individual scores. Coordinates have been deliberately omitted to deter poachers.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.