Estructura dasométrica de las plantas de un parche de Polylepis besseri incarum y avifauna asociada en la Isla del Sol (Lago Titicaca, La Paz - Bolivia)
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Ecología en Bolivia
Abstract
Mediante censos y medición del diámetro del tronco principal de las plantas, estudiamos la estructura dasométrica de un parche de Polylepis besseri incarum. Sobre la base del trampeo con redes niebla, observación directa y caminatas, determinamos la composición de la avifauna asociada a P. b. incarum en la comunidad Japapi de la Isla del Sol en el Lago Titicaca, La Paz. Observaciones complementarias sobre el estado de conservación de los rodales de P. b. incarum fueron realizadas en la localidad de Yumani (Isla del Sol). Se censaron 156 (100%) plantas de P. b. incarum en la comunidad Japapi. La proporción de plantas jóvenes hasta los 2 cm de diámetro fue muy baja (24 individuos), las plantas adultas con diámetro mayor a 32 cm fueron más frecuentes con 54 individuos. La dominancia de plantas fue en individuos de tamaño mediano con diámetros entre 4 y 16 cm (78 individuos). Un total de 29 especies de aves fue registrado en alguna categoría de afinidad a esta especie de Polylepis. Diglossa brunneiventris es nuevo registro de especie y departamento (La Paz) y Conirostrum cinereum fue considerado raro en la región.
Based on census and diameter measurements of tree main trunks methods, the dasometric structure of a Polylepis besseri incarum patch was studied. With mist netting, direct observation and random walks methods, the avifauna composition associated to P. b. incarum in Japapi, Isla del Sol, Lago Titicaca (Bolivia) was determined. Complementary observations on the conservation status of P. b. incarum patches in the localities Yumani (Isla del Sol) were applied. A total of 156 plants of P. b. incarum were counted. The proportion of young plants (2 cm of diameter) was low (24 individuals). While adult plants (>32 cm of diameter) were frequent with 54 individuals. Plants of medium size with diameters between 4-16 cm were dominant (78 individuals). A total of 29 species of birds in Polylepis forest's affinity category was found. The black-throated Flowerpiercer (Diglossa brunneiventris) is a new record and also a new departmental (La Paz) record; and the Cinereus Conebill (Conirostrum cinereum) was considered rare in this region.
Based on census and diameter measurements of tree main trunks methods, the dasometric structure of a Polylepis besseri incarum patch was studied. With mist netting, direct observation and random walks methods, the avifauna composition associated to P. b. incarum in Japapi, Isla del Sol, Lago Titicaca (Bolivia) was determined. Complementary observations on the conservation status of P. b. incarum patches in the localities Yumani (Isla del Sol) were applied. A total of 156 plants of P. b. incarum were counted. The proportion of young plants (2 cm of diameter) was low (24 individuals). While adult plants (>32 cm of diameter) were frequent with 54 individuals. Plants of medium size with diameters between 4-16 cm were dominant (78 individuals). A total of 29 species of birds in Polylepis forest's affinity category was found. The black-throated Flowerpiercer (Diglossa brunneiventris) is a new record and also a new departmental (La Paz) record; and the Cinereus Conebill (Conirostrum cinereum) was considered rare in this region.
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Vol. 44, No. 1