Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego
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 in April 2007, Ma...
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todo:paper_07224060_v35_n7_p973_Diez2023-10-03T15:37:07Z Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego Diez, M.J. Pérez-Barros, P. Carolina Romero, M. Scioscia, G. Tapella, F. Cabreira, A.G. Madirolas, A. Raya Rey, A. Lovrich, G.A. Distribution Hydroacoustic Krill Shoals Sub-Antarctic diet lobster pelagic ecosystem spatial distribution spatiotemporal analysis swarming water column Beagle Channel Patagonia Tierra del Fuego [(ARC) South America] algae Animalia Anomura Crustacea Euphausiacea Galatheidae Munida Munida gregaria 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 in April 2007, March 2008 and March 2010. Samples from swarms were taken in May 2007 and April 2010. Also, during November 2008 and January 2009, two acoustic 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. © 2012 Springer-Verlag. Fil:Pérez-Barros, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Raya Rey, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lovrich, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07224060_v35_n7_p973_Diez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Distribution Hydroacoustic Krill Shoals Sub-Antarctic diet lobster pelagic ecosystem spatial distribution spatiotemporal analysis swarming water column Beagle Channel Patagonia Tierra del Fuego [(ARC) South America] algae Animalia Anomura Crustacea Euphausiacea Galatheidae Munida Munida gregaria |
| spellingShingle |
Distribution Hydroacoustic Krill Shoals Sub-Antarctic diet lobster pelagic ecosystem spatial distribution spatiotemporal analysis swarming water column Beagle Channel Patagonia Tierra del Fuego [(ARC) South America] algae Animalia Anomura Crustacea Euphausiacea Galatheidae Munida Munida gregaria Diez, M.J. Pérez-Barros, P. Carolina Romero, M. Scioscia, G. Tapella, F. Cabreira, A.G. Madirolas, A. Raya Rey, A. Lovrich, G.A. Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego |
| topic_facet |
Distribution Hydroacoustic Krill Shoals Sub-Antarctic diet lobster pelagic ecosystem spatial distribution spatiotemporal analysis swarming water column Beagle Channel Patagonia Tierra del Fuego [(ARC) South America] algae Animalia Anomura Crustacea Euphausiacea Galatheidae Munida Munida gregaria |
| description |
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 in April 2007, March 2008 and March 2010. Samples from swarms were taken in May 2007 and April 2010. Also, during November 2008 and January 2009, two acoustic 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. © 2012 Springer-Verlag. |
| format |
JOUR |
| author |
Diez, M.J. Pérez-Barros, P. Carolina Romero, M. Scioscia, G. Tapella, F. Cabreira, A.G. Madirolas, A. Raya Rey, A. Lovrich, G.A. |
| author_facet |
Diez, M.J. Pérez-Barros, P. Carolina Romero, M. Scioscia, G. Tapella, F. Cabreira, A.G. Madirolas, A. Raya Rey, A. Lovrich, G.A. |
| author_sort |
Diez, M.J. |
| title |
Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego |
| title_short |
Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego |
| title_full |
Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego |
| title_fullStr |
Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego |
| title_full_unstemmed |
Pelagic swarms and beach strandings of the squat lobster Munida gregaria (Anomura: Munididae) in the Beagle Channel, Tierra del Fuego |
| title_sort |
pelagic swarms and beach strandings of the squat lobster munida gregaria (anomura: munididae) in the beagle channel, tierra del fuego |
| url |
http://hdl.handle.net/20.500.12110/paper_07224060_v35_n7_p973_Diez |
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