Janzen, Daniel H.

dc.contributor.advisor
dc.contributor.author	Janzen, Daniel H.
dc.date.accessioned	2018-06-06T21:02:54Z
dc.date.available	2018-06-06T21:02:54Z
dc.date.issued	1982
dc.identifier.other	191044288
dc.identifier.uri	http://hdl.handle.net/11606/648
dc.description.abstract	Horses are major contemporary dispersers of guanacaste tree seeds (Enterolobium cyclocarpum) in Costa Rica, and probably were in prehistoric times as well. By placing 2-L and 8-L piles of fresh horse dung containing 5, 125, or 500 guahacaste seeds each in grassland and adjacent deciduous forest (Santa Rosa National Park, Costa Rica) 1 determined that (1) the seeds have a much greater chance of being harvested by seed predator rodents (Liomys salvini) from the dung in forest than that in adjacent grassland, (2) an 8-L seed-rich dung pile hides a larger absolute number of seeds from rodents than does a 2-L seed-rich dung pile, (3) a seed has a much greater chance of being harvested from a seed-rich dung pile than from a seed-poor dung pile, and (4) the grassland rodent Sigmodon hispidus harvests sorne of the germinating guanacaste seeds from the dung but leaves hard dormant seeds behind. These findings suggest that a guanacaste seed dispersal agent that defecates small numbers of seeds in many small piles of dung in grassland will be a better dispersal agent for guanacaste tree seeds than one that defecates many seeds in a few large dung piles in the nearby forest.	es_CR
dc.language.iso	en	es_CR
dc.subject	Costa Rica; defecation; dung; Enterolobium cyc1ocarpum; grassland; Guanacaste tree; Liomys salvini; pasture; Santa Rosa National Park; seed dispersal; seed predation; Sigmodon hispidus; tropical deciduous foresto	es_CR
dc.type	Article	es_CR