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Short-term variability in abundance and vertical distribution of the opossum shrimp Neomysis americana in the Solis Grande river estuary, Uruguay
Calliari, D.; Cervetto, G.; Gomez, M.; Bastreri, D. (2001). Short-term variability in abundance and vertical distribution of the opossum shrimp Neomysis americana in the Solis Grande river estuary, Uruguay. Atlântica 23: 117-125
In: Atlântica: Periódico do Instituto de Oceanografia. Universidade Federal do Rio Grande - FURG: Rio Grande, RS. ISSN 0102-1656; e-ISSN 2236-7586
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Aquatic communities > Plankton > Zooplankton
    Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
    Neomysis americana (S.I. Smith, 1873) [WoRMS]
    Marien/Kust
Auteurs  Top 
  • Calliari, D.
  • Cervetto, G.
  • Gomez, M.
  • Bastreri, D.
Abstract
    Mysids are key taxa in ecosystems like estuaries and sandy beaches, but their occurrence in uruguayan coasts has been almost completely unnoticed. Here we analyse variability in Neomysis americana numbers at hourly and daily time scales in the Solis Grande river estuary, a sub-estuary that empties into the Rio de la Plata (Uruguay). Samples weretaken at two stations along the main axis (mouth and upper river), two depth strata (surface and bottom), and four times a day for a 15 day period; on two occasions hourly samplings covering the 24 h cycle were also performed. Mysids occurred in largest numbers in the upper river and at the beginning of the study period (max. 1975 ind.m-3), but theirabundance decreased as environmental conditions changed to less saline and warmer waters. These results may indicate that the population from the Solis estuary would be a self-sustaining unit. Hourly variations in mysid numbers demonstrated a pattern of appearance during darker hours and disappearance during light hours, suggesting a circadian behaviour of excursions from the hyperbenthos to the pelagic domain. This behaviour would reflect a trade off between foraging and predation risk analogous to diel vertical migrations of zooplankton in deeper environments.
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