Occurrence of Pelagic Juveniles of Munida Gregaria (Fabricius, 1793) (Anomura, Galatheidae) in San Jorge Gulf, Argentina

Varisco, Martín; Vinuesa, Julio H.

doi:10.1163/001121610x521172

Cited by 16 publications

(18 citation statements)

References 3 publications

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“…This type of events has been reported for P. planipes along the coasts of East Pacific and associated with different causes (e.g., population migration, intense currents) (Aurioles-Gamboa et al 1994;Robinson and Gómez-Aguirre 2004). Similar strandings were reported for M. gregaria in New Zealand (McClatchie et al 1991) and Golfo San Jorge, Southwestern Atlantic Ocean (Varisco and Vinuesa 2010).…”

Section: Introductionsupporting

confidence: 78%

“…In other locations, strandings of swarming animals have also been reported, that is, in New Zealand (McClatchie et al 1991) and in the Atlantic coast of SSA ca. 45°53 0°S (Varisco and Vinuesa 2010). For example in Otago, New Zealand, strandings occurring in November and December 1989 along 12 km of coastline yielded *270 t dry weight over 170 days, which served as food for marine birds (McClatchie et al (Boyd 1967;Aurioles-Gamboa et al 1994;Robinson and Gómez-Aguirre 2004; and references therein).…”

Section: Discussionmentioning

confidence: 99%

“…In a period of 29 years at Dunedin (46°S 170°W), a typical swarming season lasted between 25 and 50 days (range from a few days to 6 months), ending between February and April but sometimes extending to June (Zeldis 1985). In SSA, records of swarming are fragmentary and anecdotal, mostly restricted to the Atlantic continental shelf (Matthews 1932;Rayner 1935;Kawamura 1976;Varisco and Vinuesa 2010), with a single record available from the SE Pacific coast (Tabeta and Kanamaru 1970). The absence of shoaling animals in the Beagle Channel during at least 5 years, between 1997 and 2002 , and the recent occurrence of swarms, is coincident with what occurs in other locations of SSA (Patagonia, c.f.…”

Section: Discussionmentioning

confidence: 99%

“…Although its pelagic presence was first sighted in southern South America (SSA) by early explorers in the sixteenth century (Poore et al 2011), the occurrence of pelagic swarms has only been reported during the first half of the twentieth century (Matthews 1932;Rayner 1935). However, nowadays (2007However, nowadays ( -2010, such swarms seem to be more frequent than before, mainly in the Golfo San Jorge (Madirolas et al 2009;Varisco and Vinuesa 2010) and in the Beagle Channel (personal observations).…”

Section: Introductionmentioning

confidence: 98%

“…Moreover, swarms of M. gregaria and P. monodon occur associated with internal waves as a strategy to avoid sinking to the bottom (Zeldis and Jillett 1982;Bertrand et al 2008). Recently, Varisco and Vinuesa (2010) related the occurrence of pelagic swarms of juvenile M. gregaria in the Golfo San Jorge to an increase in the concentration of chlorophyll-a, and the consequent increase in food availability.…”

Section: Introductionmentioning

confidence: 99%

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Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego

et al. 2012

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The present article is the first formal record of pelagic swarms and beach strandings of the squat lobster Munida gregaria in the Beagle Channel, southern South America. To describe size composition and natural diet of beach strandings and swarms, samples from strandings were taken surveys were carried out to describe both, horizontal distribution and school metrics of swarms. Pelagic swarms and beach strandings were composed of 100% individuals of the morph gregaria of M. gregaria. Mean size of males and females in both, beach strandings and swarms, were similar. The diet of pelagic M. gregaria was composed mainly of crustaceans, unicellular algae and small macroalgae, sediment and particulate organic matter. Swarms of pelagic Munida took the shape of extended layers of varying density and height. Their positions in the water column were also variable: swarms were found at different depths, from the subsurface layer to near the sea bottom. Occasionally, some large swarms occupied most of the water column. In the Beagle Channel, SW winds during spring tides could be a forcing factor for M. gregaria strandings. The absence of shoaling animals in the Beagle Channel between 1997 and 2002 and the recent occurrence of swarms are coincident with their appearance in other locations in Patagonia. In consequence, we hypothesize that the factor influencing the formation of swarms must be acting at a regional scale.

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Section: Introductionsupporting

confidence: 78%