Spatial distribution of communal nests in a colonial breeding bird: benefits without costs?
| العنوان: | Spatial distribution of communal nests in a colonial breeding bird: benefits without costs? |
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| المؤلفون: | Melanie Vogel, Urs Christian Gießelmann, Jork Meyer, Roland Brandl, Thorsten Wiegand |
| المصدر: | Austral Ecology. 33:607-613 |
| بيانات النشر: | Wiley, 2008. |
| سنة النشر: | 2008 |
| مصطلحات موضوعية: | education.field_of_study, Ecology, biology, Population, Territoriality, Spatial distribution, biology.organism_classification, Nest, Common spatial pattern, education, Spatial analysis, Sociable weaver, Ecology, Evolution, Behavior and Systematics, Spatial organization |
| الوصف: | The spatial organization of individuals, or groups of individuals, within a population can provide valuable information about social organization and population dynamics. We analysed the spatial distribution of nests of the sociable weaver (Philetairus socius) on two farms in the Kalahari. Sociable weavers build large communal nests on big savannah trees, forming a pattern of trees with and without nests. We used two spatial statistics, Ripley's K and the pair correlation function, to describe characteristics of the point patterns over a range of distances. (i) At distances of 200 and 300 m, communal nests were clustered. (ii) At distances greater than 1000 m, communal nests were regularly distributed. These findings are independent of the spatial distribution of trees. Furthermore, we used Moran's I to analyse spatial autocorrelation of nest sizes. We expected negative autocorrelation because of competition between nests. But on both farms there was no significant autocorrelation of nest sizes for any distance class. The regular distribution observed at larger distances may indicate competition and/or territoriality among different nests, but the lack of spatial autocorrelation between nest sizes suggests that these interactions may happen between nest clusters rather than between single nests. This was confirmed by significant clustering of nests on small scales. We thus suggest, that colonies of P. socius consist of several nests on adjacent trees forming a cluster of subcolonies. The question why sociable weavers establish subcolonies instead of adding more chambers to the natal nest, could not simply be answered by limitation of nesting space. We suggest a strategy to avoid costs due to increasing colony size. |
| تدمد: | 1442-9993 1442-9985 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::6db6e2d236cb86f9f085371becfa7c0b https://doi.org/10.1111/j.1442-9993.2007.01826.x |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........6db6e2d236cb86f9f085371becfa7c0b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14429993 14429985 |
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