Variability profiles for line transect bird censuses in a tropical dry forest in Mexico
Article Abstract:
A study was conducted on the seasonal and temporal patterns of avian diversity and abundance at specific sites in a Mexican tropical dry forest. Species diversity was found to be invariable among different transects. Results also revealed a temporal homogeneity in the number of species. However, Higher values for species diversity were obtained during the rainy season at arroyo habitats and at disturbed habitats, during the dry season. It was suggested that stochastic events influenced local population dynamics, as indicated by fluctuations found during the second year of research.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1993
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Impact of pasture development on winter bird communities in Belize, Central America
Article Abstract:
The conversion of tropical forests to grazing pastures in Central America greatly causes ecological displacement for many vegetation and birds. Avian species richness and abundance were significantly lower in grazed pastures than in abandoned pastures. Frugivores, nectarivores and granivores were greatly affected by tree reduction. Aerial insectivores were not greatly affected by woody vegetation reduction. Retention of some shrubs and overstory trees may offset some of the negative effects of pasture development on winter bird populations.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
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Potential roadside biases due to habitat changes along breeding bird survey routes
Article Abstract:
The potential biases of breeding bird surveys (BBS) which are carried along roadside routes were investigated. Aerial photographs of 28 BBS routes in Maryland and 25 routes in Ohio in the mid 1960s and the late 1980s were examined. The findings showed that most habitat changes that occurred along BBS routes also occurred n the off-route areas. However, changes related to urbanization were more biased towards roadsides than the reforestation of farmlands.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1999
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