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6 results for “Hirundo rustica gutturalis”
The impact of urbanization on body size of Barn Swallows Hirundo rustica gutturalis
<p><span><span><span><span><span><span><span><span><span><span><span>Urbanization implies a dramatic impact on ecosystems, which may lead to drastic phenotypic differences between urban and non-urban individuals. For instance, urbanization is associated with increased metabolic costs, which may constrain body size, but urbanization also leads to habitat fragmentation, which may favour increases in body mass when for instance it correlates with dispersal capacity. However, this apparent contradiction has rarely been studied. This is particularly evident in China where the urbanization process is currently occurring at an unprecedented scale. Moreover, no study has addressed this issue across large geographical areas encompassing locations in different climates. In this regard, Barn Swallows (<i>Hirundo rustica</i>) are a suitable model to study the impact of urbanization on wild animals because they are a widely distributed species tightly associated with humans. Here, we collected body mass and wing length data for 359 breeding individuals of Barn Swallow (<i>H. r. gutturalis</i>) from 128 sites showing different levels of urbanization around the whole China. Using a set of linear mixed-effects models, we assessed how urbanization and geography influenced body size measured using body mass, wing length and their regression residuals. Interestingly, we found that the impact of urbanization was sex-dependent, negatively affecting males' body mass, its regression residuals, and females' wing length. We also found that northern and western individuals were larger, regarding both body mass and wing length, than southern and eastern individuals. Females were heavier than males, yet males had slightly longer wings than females. Overall, our results showed that body mass of males was particularly sensitive trait to urbanization, latitude and longitude, while it only showed a weak response to latitude in females. Conversely, while wing length showed a similar geographical pattern, it was only affected by urbanization in the case of females. Further research is needed to determine if these phenotypic differences are associated with negative effects of urbanization or potential selective advantages.</span></span></span></span></span></span></span></span></span></span></span></p>
The impact of urbanization on body size of Barn Swallows Hirundo rustica gutturalis
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Fig. 4 in Effectiveness of Morphological Sex Determination in the East Asian Barn Swallow (Hirundo rustica gutturalis) on Spring Migration
Fig. 4. Probability of being males by discriminant score in the East Asian Barn Swallows Hirundo rustica gutturalis.
Fig. 3 in Effectiveness of Morphological Sex Determination in the East Asian Barn Swallow (Hirundo rustica gutturalis) on Spring Migration
Fig. 3. Canonical discriminant scores of each sex calculated for the sex determination of the East Asian Barn Swallow Hirundo rustica gutturalis.
Fig. 2 in Effectiveness of Morphological Sex Determination in the East Asian Barn Swallow (Hirundo rustica gutturalis) on Spring Migration
Fig. 2. Distribution of the streamer length (T6-T5) and white tail patch length of the East Asian Barn Swallow Hirundo rustica gutturalis. Black circles denote females and white circles denote males. Posterior probability of being male, calculated from the discriminant function, is presented as a contour map; isopleths of probability are marked from 0.1 to 0.9.
Fig. 1 in Effectiveness of Morphological Sex Determination in the East Asian Barn Swallow (Hirundo rustica gutturalis) on Spring Migration
Fig. 1. Frequency distribution of (a) streamer lengths (T6-T5) and (b) white patch lengths selected by stepwise discriminant function analysis for the sex determination of the East Asian Barn Swallow Hirundo rustica gutturalis. Black columns denote females and white columns denote males; curved lines are the expected normal distributions of measurements reconstructed for each sex.
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