NDLI: On the density-dependence of seed predation in Dipteryx micrantha, a bat-dispersed rain forest tree

Content Provider	Springer Nature Link
Author	Romo, Mónica Tuomisto, Hanna Loiselle, Bette A.
Copyright Year	2004
Abstract	We studied the effect of seed density on seed predation by following the fate of bat-dispersed Dipteryx micrantha (Leguminosae) seeds deposited under bat feeding roosts. The study was conducted in Cocha Cashu biological station, Amazonian Peru, during the fruiting period of Dipteryx. Predation of Dipteryx seeds in the area is mainly by large to medium-sized rodents. Seed deposits beneath bat feeding roosts were monitored for a 13-week period in an 18-ha study area. A total of 210 seed deposits were found, and on average, seed predators encountered 22% of them during any one week. About one-third of the seed deposits escaped predation, and those deposits that had relatively few seeds were more likely to go unnoticed by rodents than were deposits with many seeds. The mean seed destruction rate was 8% per week; deposits with many seeds tended to lose a smaller proportion of their seeds to seed predators than did deposits with few seeds. Regression tests for the weekly data showed that, at the beginning of the observation period, seed predation was not density-dependent. Later, when the total seed crop beneath roosts was high, the number of seeds predated per deposit was positively density-dependent, while the proportion of seeds predated was negatively density-dependent, indicating predator satiation. Seed deposits that had been visited by seed predators once had a higher probability of being revisited the week after, especially if they contained many seeds when first encountered. This indicates that the foraging behavior of rodents may be affected by their remembering the location of seed-rich patches.
Starting Page	76
Ending Page	85
Page Count	10
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	140
Issue Number	1
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-05-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Seed predation Density-dependence Rodents Bat feeding roosts Dipteryx
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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