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Título: | Can forest fragmentation disrupt a conditional mutualism? A case from central Amazon |
Autor: | Jorge, Maria Luisa S. P. Howe, Henry Franklin |
Palavras-chave: | Behavioral Ecology Climate Effect Forest Ecosystem Fragmentation Mutualism Rodent Seasonal Variation Seed Dispersal Seed Predation Site Investigation Analysis Of Variance Animals Arecaceae Ecosystem Feeding Behavior Geography Physiology Seed Plant Population Dynamics Rodent Season Tree Analysis Of Variance Animal Arecaceae Ecosystem Feeding Behavior Geography Population Dynamics Rodentia Seasons Seeds Trees South America Arecaceae Astrocaryum Astrocaryum Aculeatum Caviomorpha Dasyprocta Dasyprocta Leporina Myoprocta Acouchy Rodentia |
Data do documento: | 2009 |
Revista: | Oecologia |
É parte de: | Volume 161, Número 4, Pags. 709-718 |
Abstract: | This is the first study to investigate whether scatter-hoarding behavior, a conditional mutualism, can be disrupted by forest fragmentation. We examined whether acouchies (Myoprocta acouchy, Rodentia) and agoutis (Dasyprocta leporina, Rodentia) changed scatter-hoarding behavior toward seeds of Astrocaryum aculeatum (Arecaceae) as a consequence of a decrease in forest-patch area. Our study was conducted at the 30-year-old Biological Dynamics of Forest Fragments Project, in central Amazon, Brazil. We tested whether forest size affected the number of Astrocaryum seeds removed and scatter-hoarded (and likely dispersed) by acouchies and agoutis, as well as the distance that the seeds were hoarded. The study extended over three seasons: the peak of the rainy season (March-April), the transition between the rainy and the dry season (May-June), and the peak of the dry season (August-September). Our results revealed that the number of seeds removed was larger in smaller fragments, but that the percentage of seeds hoarded was much lower, and seeds eaten much higher, in 1-ha fragments. Moreover, fewer seeds were taken longer distances in fragments than in the continuous forest. Site affected the number of seeds removed and season affected the percentage of seeds hoarded: more seeds were removed from stations in one site than in two others, and hoarding was more important in April and September than in June. Our study reveals that scatter-hoarding behavior is affected by forest fragmentation, with the most important disruption in very small fragments. Fragmentation converts a largely mutualistic relationship between the rodents and this palm in large forest patches into seed predation in small fragments. © Springer-Verlag 2009. |
DOI: | 10.1007/s00442-009-1417-7 |
Aparece nas coleções: | Artigos |
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