Local and Regional Forces - 2456 Words

Section B. Is local diversity a product of regional forces, local forces, or both, and how might we know? In ecology, the change in species diversity across space and time is one of the oldest studied subjects, however the underlying causes of many diversity patterns is under much debate (Field et al. 2001; MacArthur, 1972; Rosenzweig, 1995). How does diversity arise (Erwin 1991)? How is diversity distributed in space (Dean et al. 1997, Fonseca et al. 2000)? And how is diversity maintained (Lande, 1988)? Are three fundamental questions that ecologist look to answer. Early studies focused around the role of competition in determining diversity at local scales, today however it is emphasized that many factors on top of competition, such†¦show more content†¦This problem may be avoided with the use of defining and measuring regional species pools (Srivastava, 1999) as well as other effective methods for avoiding such pitfalls. (Belmaker amp; Jetz, 2012; Harrison amp; Cornell, 2008, Partel, et al. 2011) in future studies. By expanding on the understanding of the local and regional relationships on diversity patterns it can be demonstrated that there is a partnered balance between (Cornell amp; Harrison2008; Ricklefs, 2007) local forces such as competition and disturbances, and regional factors such as climate history, evolution and migration all influencing species diversity and regulating species richness within a pool/community (Blenckner amp; Hillebrand 2002) Cornell and Lawton 1992, Huston 1999). References Ackerly, D.D., Adler, F., Agrawal, A. A., Arnold, E.A., Caceres, C., Doak, D.F., Hudson, J., Maron, J., Mooney, K.A., Post, E., Power, M., Stachowicz, J., Strauss, S., Turner, M.G. amp; Werner, E. (2007). Filling key gaps in population and community ecology. – Front. Ecology Environment. 5: 145–152. Allen, A.P., Brown, J.M., Bush, M.B., Cornell, H.V., Harrison, S.P., Hurlert, A.H., Knowlton, N., Lessios, H.A., McCain, C.M., McCune, R., McDade, L.A., McPeek, M.A., Mittleback, G.G., Near, T.J., Price, T.D., Ricklefs, R.E., Roy, K., Sax, D.F., Schemske, D.W., Schluter, D., Sobel, J.M. amp;Show MoreRelatedLocal and Regional Forces2472 Words   |  10 PagesSection B. Is local diversity a product of regional forces, local forces, or both, and how might we know? In ecology, the change in species diversity across space and time is one of the oldest studied subjects, however the underlying causes of many diversity patterns is under much debate (Field et al. 2001; MacArthur, 1972; Rosenzweig, 1995). How does diversity arise (Erwin 1991)? How is diversity distributed in space (Dean et al. 1997, Fonseca et al. 2000)? And how is diversity maintainedRead MoreUnited States Southern Command ( Southcom ) Essay930 Words   |  4 PagesUnited States Southern Command (SOUTHCOM) has been working to build regional and interagency partnerships to ensure the continued stability of the Western Hemisphere and the forward defense of the U.S. homeland for more than fifty years. 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