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Showing papers by "William F. Laurance published in 1991"


Journal ArticleDOI
TL;DR: In this paper, a core-area model is proposed for assessing the ecological impacts of edge effects in fragments of natural habitat surrounded by artificial edges. But the model requires two edge function parameters and the area and perimeter length of the fragment.

672 citations


Journal ArticleDOI
TL;DR: The results highlight the importance of tolerance of modijied habitats in determining survival of nonpying mammals in tropical forest fragments and the implications for hopical forest conservation.
Abstract: . There is a dire need to predict the vulnerability of tropical forest biotas to habitat fragmentation I tested the efficacy of seven ecological traits (body size Iongeuity, fecundity, trophic level, dietary specialization, natural abundance in rain forest and abundance in the surrounding habitat matrix) for predicting responses of 16 nonflying mammal species to rain forest fragmentation in tropical QueenslaM Australia An ordination analysis revealed that most (84%) of the variation in traits was described by two axes, the first separating rand K-selected species, and the second discriminating rare species with specialized diets from common species with generalized diets. Using multiple regression analysis, the two ordination axes explained 51.7% of variation in mammal extinction proneness (F = 9.96 P = 0.009). Howem, univariate tests revealed tbat a single trait abundance in the mawas a betterpredictor of vulnerability (r2= 63.8%, F = 24.69, P < 0.001). Partial correlations demonstrated that once the effects of matrix abundance tuete remove4 no other traits or ordination axes were significant predictors of extinction proneness. These results highlight the importance of tolerance of modijied habitats in determining survival of nonpying mammals in tropical forest fragments. Species tbat traverse or exploit modaxied habitats tend to remain stable or inmase in fragments whereas those tbat avoid these habitats often disappem The implications of these findings for hopical forest conservation are discussed. Resumen: Hay UM extrema necesidad de predecir la vulnerabilidud de las biotas de los bosques hopicales ante la fragmentacidn del habitat. PmM la eficacia de siete caracterfsticas ecoldgicas (tamano del cum, longeviw fecund iu nivel tdfico, especializacidn en la dietq abundancia natural en el bosque y abundancia en los alrodedores del hhbitat matriz) parapredecir las respuestas de 16 especies de mamtyms, no uoladores, a lafragmentacih del Witat en la Queensland hOpicaJ en Australia Un atuilisis de orde namiento revelo que la muyoria (84%) de la variacidn en las caracteristicas estaba descrita por dos ejes, el primem separando ry Kespecies seleccionadas y el segundo discriminando las especies raras con dietas especializadas de las especies comunes con dietas generalizadas. Utilizando un atuilisis de regresih multiple, los dos ejes de ordenamiento explicmn el 51.7% de variacidn en la propension a la extincidn en los mamQms (F = 9.96. P = 0.009). Corno quiera que sea las pruebas de univarianza demostraron que una sdla caracterfsticq abundancia en la matriz; fue mejor para predecir la vulnerabilidad (r = 63.8%, F = 24.69, P < 0.001). Correlaciones parciales demostramn que UM vez que los efectos de la abundancia en la mamz fuenm removidos, ninguna otra caracteristica oeje de ordmamiento d i m pdicciones significativas de la pmpmiidn a la extincidn. Estos resultados resaltan la importancia de la tolerancia de hhbitats modificados en la determinueidn de la sobrevivencia de mamveros no voladores en fragmentos de bosques hppicales Las especies que atraviesan o explotan los hcibitats modificados tienden a permanecer estables o a incrementarse en el fragmentado mientras que las espcies que evitan estos habitats con frecuatcia desapawen Se discuten las implicaciones de estos hallazgos en la conservacion de bosques tropicales.

442 citations


Journal ArticleDOI
TL;DR: It is suggested that isolated nature reserves in NE Queensland must exceed 2000–4000 ha, depending on reserve shape, to ensure that >50% of the reserve remains unaffected by induced forest.

402 citations