TY - JOUR
T1 - Female and male pollination success of Oncidium ascendens Lindey (Orchidaceae) in two contrasting habitat patches
T2 - Forest vs agricultural field
AU - Parra-Tabla, Víctor
AU - Vargas, Carlos F.
AU - Magaña-Rueda, Sergio
AU - Navarro, Jorge
N1 - Funding Information:
The Secretarı́a de Educación Pública (1995–1996) and the Consejo Nacional de Ciencia y Tecnologı́a (1997; Project 3076P-N9607) provided financial support to VPT. Azucena Canto, Jorge Leirana Juan Tun and Roger Medina provided invaluable help during field work. Luis Eguiarte, Peter Feinsinger, Phil Hulme, and Victor Rico-Gray kindly reviewed earlier manuscripts. Two anonymous reviewers and Mark Schwartz made helpful comments on the manuscript. We thank specially Pete Feinsinger for his advice and encouragement.
PY - 2000/7
Y1 - 2000/7
N2 - We studied the pollination success of the orchid Oncidium ascendens in two contrasting patches of dry tropical forest; a well-preserved deciduous forest and a tract of continuously disturbed agricultural-pastoral field landscape. O. ascendens is a self-incompatible species whose sexual reproduction depends on cross pollination by the native bee Trigona nigra. We recorded pollinia removal and fruit production during three consecutive years. On average, pollinia removal was three times higher in the well-preserved habitat patch than in the disturbed patch. The rate of pollinia removal increased by about 7% through the 3 years in the forest patch but decreased by 5% in the disturbed site. Fruit production remained relatively constant from year to year in the well-preserved site and decreased in the disturbed patch. On average, fruit production was two times higher in the forest site than in the disturbed patch. Currently O. ascendens is common in both areas, but these results suggest that agricultural activities disrupt pollination and may eventually alter the overall reproductive success and persistence of the orchid population. (C) 2000 Elsevier Science Ltd.
AB - We studied the pollination success of the orchid Oncidium ascendens in two contrasting patches of dry tropical forest; a well-preserved deciduous forest and a tract of continuously disturbed agricultural-pastoral field landscape. O. ascendens is a self-incompatible species whose sexual reproduction depends on cross pollination by the native bee Trigona nigra. We recorded pollinia removal and fruit production during three consecutive years. On average, pollinia removal was three times higher in the well-preserved habitat patch than in the disturbed patch. The rate of pollinia removal increased by about 7% through the 3 years in the forest patch but decreased by 5% in the disturbed site. Fruit production remained relatively constant from year to year in the well-preserved site and decreased in the disturbed patch. On average, fruit production was two times higher in the forest site than in the disturbed patch. Currently O. ascendens is common in both areas, but these results suggest that agricultural activities disrupt pollination and may eventually alter the overall reproductive success and persistence of the orchid population. (C) 2000 Elsevier Science Ltd.
KW - Disturbance and pollination
KW - Human disturbance
KW - Mexico
KW - Orchidaceae
KW - Pollination success
KW - Tropical dry forest
UR - http://www.scopus.com/inward/record.url?scp=0034085287&partnerID=8YFLogxK
U2 - 10.1016/S0006-3207(99)00187-1
DO - 10.1016/S0006-3207(99)00187-1
M3 - Artículo
SN - 0006-3207
VL - 94
SP - 335
EP - 340
JO - Biological Conservation
JF - Biological Conservation
IS - 3
ER -