Affiliation:
1. Universidade Estadual do Norte Fluminense, Brazil
Abstract
Hydrochemical conditions in the Açu Lagoon are described using spatial and temporal variations of various limnological variables (water temperature, dissolved oxygen, electric conductivity, total alkalinity, carbon dioxide, dissolved and total nutrients (N, P and Si), and chlorophyll a). Collected data was used in order to understand the structure and functioning of an enclosed coastal lagoon strongly influenced by climatic conditions. Water samples were collected monthly (November 1999-December 2000) in five sampling stations established along the lagoon. A decreasing spatial gradient of electrical conductivity was observed beginning from a sand bar region between the lagoon and the sea in the direction of the sweet-water input area. The positive correlation observed between the pH and dissolved oxygen (DO) values, and the negative one observed between pH values and those of carbon dioxide (CO2), evidenced coupled biological processes, e.g., primary production and decomposition. Both spatial and temporal variation of dissolved nutrients showed fast increase and decrease in the beginning of summer, suggesting that nutrient input resulting from rainfall stimulates phytoplankton production, as reflected by chlorophyll a concentration increase.
Subject
General Agricultural and Biological Sciences
Reference35 articles.
1. Enthic-pelagic switching in coastal subtropical lagoon;ALMULIA J.;Estuarine, Coastal and Shelf, Science,1999
2. The influence of mangrove-derived tannins on intertidal meiobenthos in tropical estuaries;ALONGI D. M.;Oecologia,1987
3. C:N:P ratios of bentic marine plants;ATKINSON M;Limnol. & Oceanogr.,1993
4. Estuarine Comparisons;BOYNTON W.,1992
5. Metabolismos dos ecossistemas aquáticos: fundamentos teóricos, métodos de estudo e análises químicas;CARMOUZE J. P.,1994
Cited by
29 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献