Dial behavioral responses of Metamysidopsis elongata atlantica (Crustacea, Mysida) to gradients of salinity and temperature

Abstract

ABSTRACT. Metamysidopsis atlantica elongata (Bascescu, 1968) is a common mysid in the surf zone of sandy beaches from the state of Rio Grande do Sul, Brazil, where it is frequently recorded forming dense aggregations. Trough laboratory trials, behavioral responses to salinity (10, 20, 25, 28, 30, 40 e 45), temperature (10, 15, 20, 30±1°C) and light (yes/no) were tested using adult males, adult females and juveniles. Although there was no response to temperature, the species showed clear response to salinity and light. In the presence of light, organisms remained in the bottom of the aquaria, but moved to surface when bottom salinities were increased. In the absence of light, adults moved to the surface. However, juveniles moved down to or remained on the bottom, maybe as a response to avoid adult predation. KEYWORDS.Mysids, behavior, light, predation. RESUMO. Respostas do comportamento nictimeral deMetamysidopsis elongata atlantica (Crustacea, Mysida) a gradientes de salinidade e temperatura. Metamysidopsis elongata atlantica (Bascescu, 1968) é um misídeo comum na zona de arrebentação de praias arenosas do Rio Grande do Sul, Brasil, onde aparece constantemente formando densas manchas. Em laboratório, respostas comportamentais a salinidade (10, 20, 25, 28, 30, 40 e 45), temperatura (10, 15, 20, 30±1°C) e luz (sim/não) foram testadas usando machos adultos, fêmeas adultas e juvenis. Embora não tenha ocorrido resposta à temperatura, as espécies mostraram respostas claras à salinidade e luz. Na presença de luz, os organismos permaneceram no fundo do aquário, porém se moveram para a superfície quando as salinidades do fundo aumentaram. Na ausência de luz, os adultos se moveram para a superfície do aquário. No entanto, os juvenis desceram ou se mantiveram no fundo, provavelmente como uma resposta para evitar a predação dos adultos.

Revision of mysids (Crustacea: Peracarida: Mysida) zoogeographical distribution in the south-west Atlantic (0° to 40°S)

“…Metamysidopsis e. atlantica usually is the most abundant and common species in coastal and estuarine waters of the south/south-east Brazilian coast (Bersano, 1994;Tararam et al, 1996;authors' own unpublished data), consequently it is the most studied species in this region. Studies relating to rearing techniques, feeding rates, moulting cycle, growth and response to gradients of temperature and salinity were carried out under laboratory conditions (Rörig et al, 1997;Gama & Zamboni, 1999;Gama et al, 2002Gama et al, , 2006Gama et al, , 2011 distribution Brazil: São Paulo, Ubatuba (Bȃcescu, 1968c), São Sebastião (Fries, 1999), Una do Prelado River (Lansac Tôha & Lima, 1993) and Cananeia estuary (Almeida Prado, 1973Prado, , 1974Tararam et al, 1996); Santa Catarina (Rörig et al, 1997; south-west atlantic mysids geographical distribution Resgalla, 2011); Rio Grande do Sul, Tramandaí Beach (Avila et al, 2009), Lagoa dos Patos estuary (Gama, 2008;Avila et al, 2011) and Cassino Beach (Bersano, 1994;Avila et al, 2011).…”

“…Later, studies by local and foreign scientists broadened the knowledge about regional mysid species richness with the description of new species from Brazilian (Bȃcescu, 1968a(Bȃcescu, , b, c, 1969(Bȃcescu, , 1984(Bȃcescu, , 1986Silva, 1970aSilva, , b, 1971aSilva, , b, 1972Silva, , 1974Silva, , 1979aReis & Silva, 1987; and Argentine waters (Hoffmeyer, 1993;Carcedo et al, 2013). To date, a limited amount of investigations concerning their biology (Loureiro Fernandes & Gama, 1996;Rörig et al, 1997;Gama & Zamboni, 1999;Gama et al, 2002Gama et al, , 2006Gama et al, , 2011, distribution and/or population structure Almeida Prado, 1973González, 1974;Silva, 1979b;Hoffmeyer, 1990;Tavares & Bond-Buckup, 1990; Tararam et al, 1996;Bond-Buckup & Tavares, 1998;Fries, 1999;Calliari et al, 2001Calliari et al, , 2007Schiariti et al, 2004Schiariti et al, , 2006Viñas et al, 2005;Cardelli et al, 2006;Borzone et al, 2007;Gama et al, 2007;Calil & Borzone, 2008;Gama, 2008) have been completed in the south-west Atlantic. In the late 1990s, Murano (1999) performed the most comprehensive review available to date of the mysidacean fauna (orders Mysida and Lophogastrida) of the South Atlantic Ocean, considering marine coastal and deep waters, including geographical and vertical distribution, detailed descriptions and illust...…”

Biodiversidade, distribuição, alimentação e papel trófico de misídeos marinhos (Crustacea, Peracarida, Mysida)

“…Metamysidopsis e. atlantica usually is the most abundant and common species in coastal and estuarine waters of the south/southeast Brazilian coast (Bersano 1994;; Chapter 3), consequently it is the most studied species in this region. Studies relating to rearing techniques, feeding rates, molting cycle, growth and response to gradients of temperature and salinity were carried out under laboratory conditions (Rörig et al 1997;Gama & Zamboni 1999;Gama et al 2002Gama et al , 2011).…”

“…Argentine waters (Hoffmeyer 1993;Carcedo et al 2013). To date, a limited amount of investigations concerning their biology (Loureiro Fernandes & Gama 1996;Rörig et al 1997;Gama & Zamboni 1999;Gama et al 2002Gama et al , 2011, distribution and/or population structure (Costa 1964;González 1974;Silva 1979b;Hoffmeyer 1990;Tavares & Bond-Buckup 1990;Bond-Buckup & Tavares 1998;Fries 1999;Calliari et al 2001Schiariti et al 2004Schiariti et al , 2006Cardelli et al 2006;Borzone et al 2007;Gama et al 2007;Calil & Borzone 2008;Gama 2008) have been completed in the Southwest Atlantic. In the late nineties, This work revisits the mysid biodiversity in the Southwest Atlantic with the goal of complementing and updating previous contributions, and identifying venues for future research.…”