Species diversity of two selected freshwater ecosystems of Abra [Philippines]
2010
Guzman, M.J.T., Abra State Inst. of Sciences and Technology, Lagangilang, Abra (Philippines)
The study was conducted to determine the species diversity of two selected freshwater ecosystems of Abra in terms of: presence of macroflora and macrofauna found in Lagayan and Lagangilang River Systems; occurrence and distribution of macrospecies present in Lagayan ang Lagangilang River ecosystems;compare the species diversity indices of the Lagayan and Lagangilang River ecosystems; assess the quality of water of the rivers ecosystems based on the presence of biological indicators; identify the relationship of the fishing activities of fishermen to the observed data. The researcher collected the macroflora and macrofauna of the two freshwater ecosystems along the banks of the river by using mosquito nets.The species were identified and classified according to the Linnanean System of classification. Frequency and relative frequency were used to determine the occurrence and species diversity of the two sites. Different diversity indices (Shannon-Weiner, Simpson, Margalef's) were used to compare the species diversity of the two freshwater ecosystems. The water quality of the ecosystems was determined by the presence or absence of the different biological indicators. Chi square was used to show the relationship of the fishing activities of fisherman and the observed data of the researcher.
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