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Dietary Relationships of Migrant and Resident Birds from a Humid Forest in Central Panama
| Content Provider | Semantic Scholar |
|---|---|
| Author | Poulin, Brigitte Lefebvre, Gaëtan |
| Copyright Year | 1996 |
| Abstract | ABSTP, ACr.--This study reports on food selection by Nearcftc migrants, especially thrushes (Catharus), wood-warblers (Oporornis, Seiurus, Wilsonia), and tyrant flycatchers (Empidonax) in a humid forest of central Panama. We attempt to determine how these migrants integrate into the resident bird community based on local food abundance and diet comparison between resident and migrant species. At our study site, migrants are most numerous during migration periods, especially in October when abundance of arthropods is low and fruits are plentiful. Migrants feed equally on fruits during both migrations, but overall depend more on an invertebrate diet. Actually, migrants feed extensively on a few invertebrate taxa that are mostly of two types: (1) small hard-bodied foliage-dwelling insects such as beetles and ants, which are of low nutritional value; and (2) invertebrates well known for producing distasteful or toxic chemicals, such as nonflying termites, millipedes, and centipedes. In contrast, the resident species feed more extensively on invertebrates of higher nutritional value (spiders, insect pupae, alate ants) and on large prey that are plentiful at tropical latitudes (orthopterans, lizards). Dietary relationships among species show that diet of migrants overlap little with that of resident species, even those with which they share a similar foraging substrate. However, unlike residents, migrants belonging to the same foraging guild have a highly similar diet. These results suggest hat past competitive interactions between migrants and residents were more important than the ones among migratory species in determining food selection by migrants. Whether the resulting high potential for competition among migrants is related to the short stay of most species at our study site or is a characteristic of several migrant populations at tropical latitudes needs further investigation. Received 8 June 1995, accepted 6 September 1995. |
| Starting Page | 277 |
| Ending Page | 287 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.2307/4088894 |
| Volume Number | 113 |
| Alternate Webpage(s) | https://sora.unm.edu/sites/default/files/journals/auk/v113n02/p0277-p0287.pdf |
| Alternate Webpage(s) | https://doi.org/10.2307/4088894 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
