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- W2170806553 abstract "Abstract Increased resource availability should favor higher animal density. It may also affect sex ratio, the male condition, and mating competition over access to females, although the direction of these variables is not straightforward to predict. Using a non‐experimental approach, we carried out preliminary research using the territorial American rubyspot ( Hetaerina americana ) by comparing two spatially separated populations and the same population in two different seasons (each comparison with varying population densities). We first compared the sex ratio by counting males (using two categories, territorial and non‐territorial) and females; relative foraging time (as an indicator of how much feeding resources each site provides); wing spot size (a sexual ornament), body size and immune melanization response (these two variables were used to assess male condition); and fighting time and contest number (to assess competition). For the seasonal comparison we used a third population in which we only compared male spot size and two indicators of condition and immune response, phenoloxidase (PO) and nitric oxide (NO) activity. The high‐density population had higher values of non‐territorial males (but similar sex ratio), relative foraging time, contest time and number, wing spot (but similar body size) and melanization response than the low‐density population. According to season, at high density, males had higher values of wing spots, PO, and NO. Our results suggest that in a population where animals have more dietary resources, males reach a better condition despite the competition being more intense." @default.
- W2170806553 created "2016-06-24" @default.
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- W2170806553 date "2008-03-04" @default.
- W2170806553 modified "2023-10-18" @default.
- W2170806553 title "Spatial and temporal population differences in male density and condition in the American rubyspot, Hetaerina americana (Insecta: Calopterygidae)" @default.
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- W2170806553 doi "https://doi.org/10.1007/s11284-008-0476-2" @default.
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