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Primary production and mortality of Eleocharis interstincta in response to water level fluctuations
Medeiros dos Santos, A.; de Assis Esteves, F. (2002). Primary production and mortality of Eleocharis interstincta in response to water level fluctuations. Aquat. Bot. 74(3): 189-199. dx.doi.org/10.1016/s0304-3770(02)00082-7
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Coastal lagoons; Grazing; Growth rate; Mortality; Primary production; Water levels; Eleocharis interstincta; ASW, Brazil, Rio de Janeiro [Marine Regions]; Brackish water

Authors  Top 
  • Medeiros dos Santos, A.
  • de Assis Esteves, F.

Abstract
    This study evaluated the net aboveground primary production (NAPP) of Eleocharis interstincta in response to water level fluctuations. Sampling was carried out every 2 weeks from June 1997 to June 1998 in the littoral region of the Jurubatiba (coastal) lagoon (Rio de Janeiro), where three 0.0625 m2 study plots were selected for cohort observation. Three quadrats from the same area were also harvested. In the laboratory, stems were oven-dried at 70°C for 3 days to reach constant weight, their heights measured and their weights taken to determine biomass. The water level fluctuated seasonally, with two periods when the water failed to cover the macrophyte stand-the end of winter (natural dry out) and in summer (artificial breaching of the sandbar). Cohort average height and mean water level in the stand were positively correlated (r = 0.91, P < 0.01). The relative growth rate of E. interstincta was not influenced by water level fluctuations, since different growth rates were observed even when the water level was stable (P < 0.05). Stem mortality and herbivory occurred throughout the year and accounted for 14.8 and 1.8% of net annual aboveground primary production (NAAPP), respectively. NAPP varied from 0.5 to 1.8 g dry weight m-2 per day, and there was a significant correlation with average water level (P < 0.05), indicating that water level has an important role in E. interstincta dynamics.

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