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A Coexistence Mechanism for Two Freshwater Prawns in the Paraná River Floodplain, Argentina

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Abstract This study examined the circadian feeding cycles of two sympatric decapod prawns, Palaemonetes argentinus (Nobili, 1901) and Macrobrachium borellii (Nobili, 1896), as a coexistence mechanism. The work was done in some shallow lakes of the alluvial valley of the Paraná River (Santa Fe, Argentina). Both prawns consume similar food items, but they differ in their feeding times. Macrobrachium borellii stomach fullness was greater during night than day, whereas P. argentinus foraging activity occurred by day. Trophic niche breadth was wide and similar in both species during the day but was expanded in P. argentinus at night when M. borellii feeding activity increased. Niche overlap fluctuated without a definite pattern. Adaptive modifications of circadian feeding rhythms play an important role in the coexistence of these species.

Affiliations: 1: Instituto Nacional de Limnología (CONICET-UNL), José Maciá 1933, 3016 Santo Tomé Santa Fe Argentina. Escuela Superior de Sanidad, Fac. Bioq. y Cs. Biol., Universidad Nacional del Litoral ( pcollins@arnet.com.ar)

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/content/journals/10.1651/c-2528
2005-01-01
2016-12-02

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