Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem

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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, an...

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Autores principales: Martinetto, P., Teichberg, M., Valiela, I., Montemayor, D., Iribarne, O.
Formato: JOUR
Lenguaje:English
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01718630_v432_n_p69_Martinetto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01718630_v432_n_p69_Martinetto
record_format dspace
spelling todo:paper_01718630_v432_n_p69_Martinetto2023-10-03T15:07:33Z Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem Martinetto, P. Teichberg, M. Valiela, I. Montemayor, D. Iribarne, O. 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 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. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01718630_v432_n_p69_Martinetto
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English
orig_language_str_mv English
topic 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
spellingShingle 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
Martinetto, P.
Teichberg, M.
Valiela, I.
Montemayor, D.
Iribarne, O.
Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
topic_facet 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
description 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.
format JOUR
author Martinetto, P.
Teichberg, M.
Valiela, I.
Montemayor, D.
Iribarne, O.
author_facet Martinetto, P.
Teichberg, M.
Valiela, I.
Montemayor, D.
Iribarne, O.
author_sort Martinetto, P.
title Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
title_short Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
title_full Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
title_fullStr Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
title_full_unstemmed Top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
title_sort top-down and bottom-up regulation in a high nutrient-high herbivory coastal ecosystem
url http://hdl.handle.net/20.500.12110/paper_01718630_v432_n_p69_Martinetto
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AT teichbergm topdownandbottomupregulationinahighnutrienthighherbivorycoastalecosystem
AT valielai topdownandbottomupregulationinahighnutrienthighherbivorycoastalecosystem
AT montemayord topdownandbottomupregulationinahighnutrienthighherbivorycoastalecosystem
AT iribarneo topdownandbottomupregulationinahighnutrienthighherbivorycoastalecosystem
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