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• W2033132326 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 353:147-156 (2008) - DOI: https://doi.org/10.3354/meps07184 Identifying environmental constraints at the edge of a species’ range: scallop Psychrochlamys patagonica in the SW Atlantic Ocean Nicolás L. Gutiérrez1,*, Ana Martínez2, Omar Defeo3 1School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, Washington 98195, USA 2Sección Oceanografía, Departamento de Biología Pesquera, Dirección Nacional de Recursos Acuáticos, Constituyente 1497, Montevideo 11200, Uruguay 3UNDECIMAR, Facultad de Ciencias, Igua 4225, PO Box 10773, Montevideo 11400, Uruguay *Email: nicolasg@u.washington.edu ABSTRACT: Recognizing the relationships between oceanographic variables and population descriptors has been a major step in understanding geographical range limits. In the present study, we investigate which oceanographic features are responsible for the decrease in fitness and consequent northern limit of the scallop Psychrochlamys patagonica distribution in Uruguayan waters of the SW Atlantic Ocean (SAO), based on information compiled from fishing and oceanographic surveys. P. patagonica showed clear population responses to physical variables, including a marked decrease in abundance, individual size and muscle weight towards the northern edge of the range. A generalized additive model (GAM) significantly explained 78.7% of the deviance in scallop abundance and retained all 4 descriptors in the model as significant, showing a decrease in abundance at lower latitudes with higher temperature and at lower values of chl a and water depth. The performance of GAMs was compared with that of the equivalent generalized linear models (GLMs) and it was concluded that the extended flexibility offered by GAMs resulted in better overall fits. Spatial variations in scallop abundance were accurately predicted by the GAM, including the 2 peaks at latitudes 36°20’S and 36°50’S. These spatial variations were closely related to the shelf break front around the 100 m isobath, where abundance was higher. The northern range limit of the species in the SAO may be caused by a sharp decrease in habitat quality, indicated by temperatures higher than 9°C (above species tolerance limit) associated with the influence of the Subtropical Water. Whereas physiological tolerance to temperature appears to be an important mechanism driving the range boundary of P. patagonica, food availability (reflected by the highest concentrations in chl a) is a key explanatory factor of the spatial variations in scallop abundance. KEY WORDS: Psychrochlamys patagonica · Species borders · Environmental constraints · Generalized additive model · GAM · Southwestern Atlantic · Uruguay Full text in pdf format PreviousNextCite this article as: Gutiérrez NL, Martínez A, Defeo O (2008) Identifying environmental constraints at the edge of a species’ range: scallop Psychrochlamys patagonica in the SW Atlantic Ocean. Mar Ecol Prog Ser 353:147-156. https://doi.org/10.3354/meps07184 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 353. Online publication date: January 17, 2008 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2008 Inter-Research." @default.
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• W2033132326 title "Identifying environmental constraints at the edge of a species’ range: scallop Psychrochlamys patagonica in the SW Atlantic Ocean" @default.
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