Length-weight regressions of the microcrustacean species from a tropical floodplain/Regressões peso-comprimento das espécies de microcrustáceos em uma planície de inundação tropical

• Published in: Acta limnológica brasiliensia Vol. 24; no. 1; p. 1
• Main Authors: de Azevedo, Fábio, Dias, Juliana Déo, Braghin, Louizi de Souza Magalhães, Bonecker, Cláudia Costa
• Format: Journal Article
• Language: English
• Published: Botucatu Associação Brasileira de Limnologia 01-01-2012
• Subjects: biomass; biomassa; Cladocera; cladocerans; cladóceros; Copepoda; copepods; copépodes; dry weight; Freshwater; peso seco; produtividade secundária; secondary productivity
• ISSN: 0102-6712; 2179-975X

Aim: This study presents length-weight regressions adjusted for the most representative microcrustacean species and young stages of copepods from tropical lakes, together with a comparison of these results with estimates from the literature for tropical and temperate regions; Methods: Samples were taken from six isolated lakes, in summer and winter, using a motorized pump and plankton net. The dry weight of each size class (for cladocerans) or developmental stage (for copepods) was measured using an electronic microbalance; Results: Adjusted regressions were significant. We observed a trend of under-estimating the weights of smaller species and overestimating those of larger species, when using regressions obtained from temperate regions; Conclusion: We must be cautious about using pooled regressions from the literature, preferring models of similar species, or weighing the organisms and building new models.