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Abstract:

In this study, carried out in San Antonio Bay (Northern Argentinean Patagonia), we aimed to understand the relative importance of bottom-up and top-down controls on macroalgal blooms in a macrotidal system with high nutrient supply and high consumer abundance. Our results show that nutrients, pH, and O 2 concentrations were higher during low tide. A field experiment showed that the biomass accumulation rate of Ulva lactuca ranged from 6 to 12% d -1 and was reduced by herbivory by 60%. The biomass accumulation rate did not differ in thalli with different initial internal nutrient pools. There was a negative relationship between the percentage of algae consumed and the N content in algal tissues, suggesting compensatory feeding by herbivores. Herbivory reduced the biomass accumulation rate of U. lactuca when PO 4 3- or no nutrients were added, but not when NO 3 - was added. In the absence of herbivory, the addition of nutrients did not increase U. lactuca biomass accumulation rate. These results suggest that nutrients remain high enough for adequate time intervals to be assimilated by macroalgae and support blooms. Large water exchange during tidal changes, however, can diminish the potential negative effects of macroalgal accumulation (oxygen depletion, high ammonium concentrations) on herbivores such that herbivores can have a large impact on macroalgae. © Inter-Research 2011.

Registro:

Documento: Artículo
Título:Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
Autor:Martinetto, P.; Teichberg, M.; Valiela, I.; Montemayor, D.; Iribarne, O.
Filiación:Lab. de Ecología, Dpto. de Biología (FCEyN), Universidad Nacional de Mar Del Plata, CC 573 Correo Central B7600WAG, Mar del Plata, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avda. Rivadavia 1917, Buenos Aires, Argentina
Leibniz-Zentrum für Marine Tropenökologie, Fahrenheitstrasse 6, 28359 Bremen, Germany
Ecosystems Center, Marine Biological Laboratory, 7 MBL St., Woods Hole, MA 02543, United States
Idioma: Inglés
Palabras clave:Coastal eutrophication; Herbivory; Nutrients; Tidal influence; Top-down vs. bottom-up controls; Ulva lactuca; abundance; accumulation rate; algal bloom; bioaccumulation; biomass; environmental disturbance; eutrophication; green alga; herbivory; macroalga; marine ecosystem; oxygen; pH; trophic control; water exchange; Argentina; Rio Negro [Argentina]; San Antonio Bay; algae; Ulva; Ulva lactuca
Año:2011
Volumen:432
Página de inicio:69
Página de fin:82
DOI: http://dx.doi.org/10.3354/meps09173
Título revista:Marine Ecology Progress Series
Título revista abreviado:Mar. Ecol. Prog. Ser.
ISSN:01718630
CODEN:MESED
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_01718630_v432_n_p69_Martinetto.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01718630_v432_n_p69_Martinetto

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Citas:

---------- APA ----------
Martinetto, P., Teichberg, M., Valiela, I., Montemayor, D. & Iribarne, O. (2011) . Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem. Marine Ecology Progress Series, 432, 69-82.
http://dx.doi.org/10.3354/meps09173
---------- CHICAGO ----------
Martinetto, P., Teichberg, M., Valiela, I., Montemayor, D., Iribarne, O. "Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem" . Marine Ecology Progress Series 432 (2011) : 69-82.
http://dx.doi.org/10.3354/meps09173
---------- MLA ----------
Martinetto, P., Teichberg, M., Valiela, I., Montemayor, D., Iribarne, O. "Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem" . Marine Ecology Progress Series, vol. 432, 2011, pp. 69-82.
http://dx.doi.org/10.3354/meps09173
---------- VANCOUVER ----------
Martinetto, P., Teichberg, M., Valiela, I., Montemayor, D., Iribarne, O. Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem. Mar. Ecol. Prog. Ser. 2011;432:69-82.
http://dx.doi.org/10.3354/meps09173