Demographic Effects of Habitat Fragmentation on a Tropical Herb: Life-table Response Experiments

Life history and past demography maintain genetic structure, outcrossing rate, contemporary pollen gene flow of an understory herb in a highly fragmented rainforest

INTRODUCTION Theory predicts that habitat fragmentation, by reducing population size and increasing isolation among remnant populations, can alter their genetic diversity and structure. A cascade of effects is expected: genetic drift and inbreeding after a population bottleneck, changes in biotic interactions that may affect, as in the case of plants, pollen dynamics, mating system, reproductiv...

The effects of habitat fragmentation on bird communities in Hyrcanian forests (Case study: Gorgan Township)

Growth of an understory herb is chronically reduced in Amazonian forest fragments

The biotic and abiotic changes associated with habitat fragmentation have been shown to have major consequences for plant recruitment and survivorship. However, few studies have quantified the growth of plants that persist in fragments. Over the course of a decade, we measured annual growth of 5200 individuals of the common understory herb Heliconia acuminata (Heliconiaceae) in an experimentall...

Habitat Fragmentation and Demographic Change for a Common Plant: Trillium in Oldgrowth Forest

I studied the influence of forest fragmentation on an understory herb, Trillium ovatum, in the Siskiyou Mountains of Oregon, where logging practices over the past 35 yr have created a mosaic of fragments surrounded by clearcuts and tree plantations. The age of trillium plants can be estimated by counting the annual constrictions on their rhizomes. Based on data collected by Whittaker in 1949 (i...

Assessing Habitat Fragmentation Effects on Primates: The Importance of Evaluating Questions at the Correct Scale

and/or keywords. This search revealed a total of 227 papers. We randomly selected 100 of these papers and identifi ed the ways in which habitat fragmentation effects are being assessed. Evaluating and Measuring Habitat Fragmentation Habitat may be broadly defi ned as “the range of environments suitable for a given species” (Hall et al. 1997 ). For primates this generally refers to broad vegetat...