San Matías Gulf

The San Matias Gulf is an inlet of the Atlantic Ocean off the coast of Patagonia, Argentina. It is bordered by the Río Negro Province to the north and west, and the Valdes Peninsula of the Chubut Province to the south. It is "one of the largest gulfs in the Patagonia region".[1] The gulf is surrounded by plateaus and depressions below sea level similar to the gulf itself but that are not flooded by the sea at present.[2]

The gulf was the subject of scientific investigation for its unusually large sand waves and their movement.[3]

The local fishing industry may be unsustainably harvesting the purple clam (Amiantis purpurata), the Tehuelche scallop (Aequipecten tehuelchus), the blue mussel (Mytilus edulis), and the ribbed mussel (Aulacomya atra), as well as the Patagonian octopus (Octopus tehuelchus).[4] The 2003 commercial squid harvest broke the previous record set in 2001 by more than double at 5,535 tonnes (5,448 long tons; 6,101 short tons).[5] As of 2014, this gulf is the only location in the world where swimming with whales is permitted for tourism, with right whales.[6]

The San Matías Gulf has a history of tectonic origin. Prior to the deglaciation that followed the last glacial period San Matías Gulf was a dry flatland below sea level. As global deglaciation went on after the Last Glacial Maximum sea level rose so that 11,000 years before present sea level surpassed the San Matías sill flooding the whole basin. This sill is currently 60 meters below sea level. The gulf has been repeatedly dried up and flooded during Quaternary glacial and interglacial periods respectively.[2]

References

  1. ^ Maria Cintia Piccolo (2005). "Oceanography of the western South Atlantic continental shelf from 33 to 55°S". In Kenneth H. Brink & Allan R. Robinson (ed.). The Global Coastal Ocean: Regional Studies and Syntheses. The Sea: Ideas and Observations on Progress in the Study of the Seas. Vol. 11. Harvard University Press. pp. 253–330. ISBN 9780674017412.
  2. ^ a b Isla, Federico Ignacio (2013). "The flooding of the San Matías Gulf: The Northern Patagonia sea-level curve". Geomorphology. 203: 60–65. doi:10.1016/j.geomorph.2013.02.013. hdl:11336/25908.
  3. ^ C. L. So; J. W. Pierce; F. R. Siegel (1974). "Sand waves in the Gulf of San Matias, Argentina". Geografiska Annaler: Series A, Physical Geography. 56 (3/4). Blackwell Publishing: 227–235. doi:10.1080/04353676.1974.11879901. JSTOR 520709.
  4. ^ Maite Narvarte; Raúl González; Pablo Filippo (October 2007). "Artisanal mollusk fisheries in San Matías Gulf (Patagonia, Argentina): An appraisal of the factors contributing to unsustainability". Fisheries Research. 87 (1): 68–76. doi:10.1016/j.fishres.2007.06.012.
  5. ^ "Record squid catch for the San Matías Gulf". MercoPress. October 15, 2003. Squid catches in the San Matías Gulf reached a record 5,535 tonnes, reports Río Negro Fisheries director, Italo Sangiulliano. ... Last year's San Matías Gulf squid fishery was a "total failure" because stocks were so low. But this year's total catch is more than double the previous record of 2,400 tonnes achieved in 2001.
  6. ^ "eLS Vermeulen - Project Right Whale – Evaluating the Impact of Tourism Activities on Southern Right Whales in North Patagonia - the Rufford Foundation".

41°30′S 64°30′W / 41.500°S 64.500°W / -41.500; -64.500


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