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Forest fragmentation and edge effects
Transcript of Forest fragmentation and edge effects
What is forest fragmentation?
''Habitat fragmentation, as the name implies, describes the emergence of discontinuities in an organism's preferred environment, causing population fragmentation.''
5 Discrete Phenomena
Reduction in the total area of the habitat
Decrease of the interior : edge ratio
Isolation of one habitat fragment from other areas of habitat
Breaking up of one patch of habitat into several smaller patches
Decrease in the average size of each patch of habitat
''Forest fragmentation is a form of habitat fragmentation, occurring when forests are cut down in a manner that leaves relatively small, isolated patches of forest known as forest fragments or forest remnants''
Sessile species dies
Mobile species run for remnants causing overcrowding, competition and decay of birth rate
Alteration on species home-range
Small areas = Small populations
More susceptible to extinction
Minimum viable population (MVP)
''MVP is the smallest possible size at which a biological population can exist without facing extinction from natural disasters or demographic, environmental, or genetic stochasticity''
''In ecology, edge effects refer to the changes in population or community structures that occur at the boundary of two habitats.''
Rafael Medeiros Ribeiro
habitat fragmentation. (n.d.). Definitions.net. Retrieved October 17, 2013, from http://www.definitions.net/definition/habitat fragmentation.
Caused by human
''Forest fragmentation is one of the greatest threats to biodiversity in forests, especially in the tropics''
Bierregaard, Richard; Claude Gascon, Thomas E. Lovejoy, and Rita Mesquita (eds.) (2001). Lessons from Amazonia: The Ecology and Conservation of a Fragmented Forest.
Holsinger, Kent (2007-09-04). "Types of Stochastic Threats". EEB310: Conservation Biology. University of Connecticut
Levin, Simon A. (2009). The Princeton Guide to Ecology. Princeton University Press.
What is being studied?
Number of nests of bees and wasps in fragments withe different sizes
Morato, E. F., & Campos, L. D. O. (1993). Efeitos da fragmentação florestal sobre vespas e abelhas solitárias em uma área da Amazônia Central (Doctoral dissertation, Universidade Federal de Viçosa.).