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The role of the white-eyed vireo in the dispersal of bersera fruit on the Yucatan Peninsula

Journal of Tropical Ecology

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Abstract

White-eyed vireos (Vireo griseus) winter in the forests and secondary growth of the Yucatan Peninsula where Bursera simaruba (Burseraceae) is an abundant tree Twenty-five per cent of all white-eyed vireos observed foraging visited Bursera trees In addition, presence and abundance of territorial white-eyed vireos in small forest patches were correlated with the size of the Bursera crop Vireos were the most reliable dispersers of Bursera seeds These birds visited 32 of 35 trees observed for at least three hours. They accounted for approximately half of all bird visits, and two-thirds of the seeds dispersed. Most of the other species rarely visited (<5% of visits) or failed to remove seeds from the tree. Peculiarities of phenology and fruit structure may contribute to the tendency of Bursera to be dispersed by relatively few species The capsules of Bursera fruits do not open when the fruit ripens; birds apparently locate ripe fruit using visual cues, although these are few In addition, only a small portion of the crop ripens daily over a 7- or 8-month period. The vireo-Bursera simaruba relationship, found regionally on the Yucatan Peninsula, may result from the prolonged fruit ripening period (October-March), the relatively depauperate frugivore community and the relatively high density of small Bursera trees in the hurricane-disturbed dry forests. Small trees at all times, and all trees from October to February, depend upon territorial vireos for continuous, highly efficient local dispersal of a small number of fruits In March and April residual fruits ripen rapidly and synchronously, attracting a greater variety of visitors for broad spectrum dispersal during a period of food scarcity. Thus, Bursera has an unusual two-phase phenological pattern, perhaps alternately to take advantage of both specialized and opportunistic dispersers.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The role of the white-eyed vireo in the dispersal of bersera fruit on the Yucatan Peninsula
Series title:
Journal of Tropical Ecology
Volume
11
Issue:
4
Year Published:
1995
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
619-639
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Tropical Ecology
First page:
619
Last page:
639
Number of Pages:
21