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Les effets directs et indirects de la structure du paysage sur l'utilisation d'îlots forestiers par le Colibri à gorge rubis (Archilochus colubris)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Desroches, Claudie |
| Copyright Year | 2011 |
| Abstract | The main goal of this study was to quantify the effects of landscape structure on the abundance of Ruby-throated Hummingbirds (Archilochus colubris) in forest patches and this, while accounting for its indirect effects on open flower community and the occurrence of Yellow-bellied Sapsuckers (Sphympicus varius), a potential commensal of hummingbirds. We sampled 40 forest patches (0.5 to >100 ha) where we had installed 2 nectar feeders (forest edge and 40 m within forest) during 2 breeding seasons (2006 and 2007). We visited forest patches weekly and recorded the number of hummingbirds detected within 10 m of feeders during 10 min. Mean daily artificial nectar consumption by hummingbirds, as well as their relative total abundance and the respective relative abundance of adult males and females, were all affected by forest cover. Except for the relative total abundance, this effect of forest cover depended upon the size of forest patches. Nectar consumption and abundance generally peaked in forest patches of intermediate size found in landscapes characterized by intermediate forest cover. Mean daily artificial nectar consumption and the relative total abundance, as well as that of males, were higher at feeders located on the forest edge compared to 40 m inside forest patches. Regarding indirect landscape effects, landscape structure influenced the structure of open flower communities surrounding feeders, which in turn, affected the relative total abundance of hummingbirds, as well as that of adult males. On the other hand, we failed to find strong evidence that landscape structure affected the occurrence of Yellow-bellied Sapsuckers or that the latter influenced Ruby-throated Hummingbird abundance patterns. These results support the idea that landscape structure may affect the abundance pattern of a species directly as well as through mechanisms which are themselves dependent upon the composition and configuration of landscapes. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://savoirs.usherbrooke.ca/bitstream/handle/11143/4894/MR79796.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
