TY - JOUR
T1 - The basis for obligate epiphytism in Tillandsia brachycaulos (Bromeliaceae) in a Mexican tropical dry forest
AU - Mondragón, Demetria
AU - Calvo-Irabien, Luz Maria
AU - Benzing, David H.
PY - 2004/1
Y1 - 2004/1
N2 - The basis of obligate epiphytism remains poorly understood. In this study we compare mortality, growth and fecundity for two populations of the epiphytic bromeliad Tillandsia brachycaulos in Yucatán. The fate of dislodged individuals of Tillandsia brachycaulos was compared with that of specimens anchored on tree bark in a dry forest in south-east Mexico. Annual percentages of dislodgement differed among location on phorophytes and epiphyte life stage, ranging from 1% on primary branches to 32% on quaternary branches, and from 7% for adult ramets to 64% for seedlings. Fallen versus attached individuals exhibited different mean annual leaf production, 18 and 21 leaves per individual respectively. The same pattern was observed for capsule (0 and 1.04 ± 1.09 capsules per individual) and ramet production (0.01 ± 0.08 and 0.54 ± 0.68 ramets per individual). Annual percentage mortality was different for fallen (92%) and attached individuals (72%). The plants on the ground and those still anchored to hosts performed differently in ways that help explain why this bromeliad is an obligate epiphyte at the study site. More fundamental causes for its obligate status are also considered.
AB - The basis of obligate epiphytism remains poorly understood. In this study we compare mortality, growth and fecundity for two populations of the epiphytic bromeliad Tillandsia brachycaulos in Yucatán. The fate of dislodged individuals of Tillandsia brachycaulos was compared with that of specimens anchored on tree bark in a dry forest in south-east Mexico. Annual percentages of dislodgement differed among location on phorophytes and epiphyte life stage, ranging from 1% on primary branches to 32% on quaternary branches, and from 7% for adult ramets to 64% for seedlings. Fallen versus attached individuals exhibited different mean annual leaf production, 18 and 21 leaves per individual respectively. The same pattern was observed for capsule (0 and 1.04 ± 1.09 capsules per individual) and ramet production (0.01 ± 0.08 and 0.54 ± 0.68 ramets per individual). Annual percentage mortality was different for fallen (92%) and attached individuals (72%). The plants on the ground and those still anchored to hosts performed differently in ways that help explain why this bromeliad is an obligate epiphyte at the study site. More fundamental causes for its obligate status are also considered.
KW - Dislodged percentage
KW - Leaf production
KW - Life-cycle
KW - Mortality
KW - Yucatán
UR - http://www.scopus.com/inward/record.url?scp=0842331000&partnerID=8YFLogxK
U2 - 10.1017/S0266467403001007
DO - 10.1017/S0266467403001007
M3 - Artículo
SN - 0266-4674
VL - 20
SP - 97
EP - 104
JO - Journal of Tropical Ecology
JF - Journal of Tropical Ecology
IS - 1
ER -