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Williams G.N.,CONICET | Zaidman P.C.,Institute Biologia Marina y Pesquera Almirante Storni IBMyPAS | Zaidman P.C.,National University of Comahue | Glembocki N.G.,CONICET | And 7 more authors.
Latin American Journal of Aquatic Research | Year: 2014

In situ records of sea surface temperature collected between 2005 and 2009 were used to compare, for the first time, the temperature estimated by the Multichannel algorithms (MCSST) of the Advanced Very High Resolution Radiometer (AVHRR) sensors in San Matías Gulf, in the north of the Argentinean Patagonian Continental Shelf (between 40o47'-42o13'S). Match-ups between in situ records and satellite sea surface temperature (SST) were analyzed. In situ records came from fixed stations and oceanographic cruises, while satellite data came from different NOAA satellites. The fitting of temperature data to a Standard Major Axis (SMA) type II regression model indicated that a high proportion of the total variance (0.53≤ r2 ≤0.99) was explained by this model showing a high correlation between in situ data and satellite estimations. The mean differences between satellite and in situ data for the full data set were 1.64 ± 1.49oC. Looking separately into in situ data from different sources and day and night estimates from different NOAA satellites, the differences were between 0.30 ± 0.60°C and 2.60 ± 1.50°C. In this paper we discuss possible reasons for the above-mentioned performance of the MCSST algorithms in the study area.


Doldan M.D.S.,Institute Biologia Marina y Pesquera Almirante Storni IBMyPAS | Oehrens-Kissner E.M.,Institute Biologia Marina y Pesquera Almirante Storni IBMyPAS | Morsan E.M.,Institute Biologia Marina y Pesquera Almirante Storni IBMyPAS | Zaidman P.C.,Institute Biologia Marina y Pesquera Almirante Storni IBMyPAS | Kroeck M.A.,Institute Biologia Marina y Pesquera Almirante Storni IBMyPAS
Latin American Journal of Aquatic Research | Year: 2012

Tumidotheres maculatus has been reported as a commensal of Mytilus platensis and Atrina seminuda and suggested as a parasite of Aequipecten tehuelchus in San Matías Gulf (SMG). The native flat oyster, Ostrea puelchana, has been studied in SMG for decades, and no crab-oyster association has been reported. In autumn-spring 2009 and 2010, oysters were collected from four banks in SMG, and the occurrence of T. maculatus inside the pallial cavity of O. puelchana was recorded. The prevalence varied between sites, with 0-12.5% at El Sótano, 0-16.7% at Caleta de los Loros, and no crabs found in the samples from Las Grutas and Puerto Lobos. Infected oysters hosted a single crab. Oysters were infested by either one male (47.7%) or one female (15.1%). A positive but low correlation was found for male crab size and oyster size. The presence of these crabs inside the oysters could be due to the overlap of the distribution areas of O. puelchana and other bivalve hosts. Our findings may also be a consequence of local fishing. Commercial extraction of traditional hosts may have caused crabs to look for new hosts.

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