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Revista de biología marina y oceanografía

On-line version ISSN 0718-1957

Abstract

RUBIO-POLANIA, Juan Carlos; SOLANA-ARELLANO, Elena; DIAZ-CASTANEDA, Victoria  and  FLORES-UZETA, Olga. Effect of sieve mesh size in the density and biomass values of the estuarine benthic community from Estero Punta Banda, Baja California. Rev. biol. mar. oceanogr. [online]. 2016, vol.51, n.3, pp.599-608. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572016000300011.

Retention of macroinvertebrates in sieves of sizes 1.0 mm and 0.5 mm were analyzed, with the aim of evaluating the effect of sieve size on density, biomass, and organisms' size in a benthic community from Estero de Punta Banda, Baja California, associated with a Zostera marina meadow. Data from 11 sampling dates from August 2009 to May 2011 were used to reach this objective. These were divided into two periods, the first between August 2009 to April 2010, and the second, between July 2010 to May 2011. A total of 13,606 organisms were collected distributed in 9 phyla and 10 classes. Nematodes showed the highest density values, meanwhile polychaetes retained in sieves of 1.0 mm showed the highest values of biomass. We found significant differences between density values of organisms retained in different sieves. These differences were attributed to a loss of 34 to 75% organisms due to the use of 1.0 mm sieve. There were no significant differences either in biomass values or in the size of the organisms in both periods, possibly due to the presence of r species strategy across the period of study. Our results indicate that the 1.0 mm and 0.5 mm sieves are appropriate to evaluate the biomass and abundance of macrofauna communities in seagrass meadows areas of temperate regions, respectively. Possibly, the best sieve to use in places with no information about biodiversity patterns or seasonal fluctuation is the one of 0.5 mm.

Keywords : Benthos; mesh size sieve; Estero de Punta Banda; anti-estuary; Baja California.

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