Influence of piers on functional groups of benthic primary producers and consumers in the channel of a subtropical coastal lagoon
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Artificial habitats have become common in coastal areas worldwide and may influence the structure and functioning of benthic ecosystems. We analyze the influence of piers on the benthic morphofunctional groups of rocky seaweeds and of soft bottom macrofauna in the channel of Conceição Lagoon (southern Brazil). The main impact is a reduction in the luminosity available for photosynthetic activity which is directly related to a decrease in the biomasses of sediment microphytobenthos and of more highly structured macroalgae life-forms. Contrary to expectations, the morphotypes of potentially high biomass productivity, such as articulated coralline, corticated and leathery macroalgae, were in general less abundant and the low biomass foliose and filamentous macroalgae occurred in reference areas but not under the piers. The piers' effects on motile epifauna and infauna functional groups were site-specific and probably related to the general reduction in primary producer organisms in the new habitats. The discretely motile infauna was the only functional group able to thrive under the piers due to their reduced motility and fragile morphological structures, being benefited by the shelter provided by the artificial habitats. Our results showed that the piers might have a negative effect on the base-trophic level organisms responsible for bottom-up controls.
Zusammenfassung in einer weiteren Sprache
Hábitats artificiais têm se tornado comum em áreas costeiras no mundo todo, podendo influenciar a estrutura e funcionamento de ecossistemas bênticos. Nós analisamos a influência de trapiches nos grupos morfofuncionais bênticos de algas associadas a substrato consolidado e de macrofauna em substrato inconsolidado, no canal da Lagoa da Conceição (sul do Brasil). O principal impacto da presença de trapiches é a redução da irradiação disponível para atividade fotossintética, o que está diretamente relacionado com o decréscimo na biomassa microfitobentônica no sedimento e de macroalga de formas de vida mais complexas. Contrário ao esperado os morfotipos com alto potencial de produtividade de biomassa, como macroalgas calcárias articuladas, corticadas e coriáceas, em geral foram menos abundantes, sendo que macroalgas foliáceas e filamentosas de menor biomassa foram encontradas exclusivamente em áreas controle. Os efeitos do trapiche nos grupos funcionais de epifauna e infauna foram específicos ao ponto de coleta e provavelmente relacionados com redução generalizada de produtores primários e com o novo hábitat criado. A infauna discretamente móvel foi o único grupo funcional capaz de prosperar embaixo dos trapiches, devido à sua mobilidade reduzida e frágil estrutura morfológica, beneficiando-se do abrigo oferecido pelos hábitats artificiais. Nossos resultados mostraram que os trapiches podem ter um efeito negativo sobre os organismos da base da cadeia trófica, responsáveis pelo controle bottom-up.
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PAGLIOSA, Paulo Roberto, Mauricio CANTOR, Fernando SCHERNER, Mariana Beatriz Paz OTEGUI, Aurea Luiza LEMES-SILVA, Cintia Dalcuche Leal MARTINS, Giorgia Freitas ALVES, Alessandra FONSECA, Paulo Antunes HORTA JR, 2012. Influence of piers on functional groups of benthic primary producers and consumers in the channel of a subtropical coastal lagoon. In: Brazilian Journal of Oceanography. Instituto Oceanográfico da Universidade de São Paulo. 2012, 60(1), pp. 65-73. ISSN 1679-8759. eISSN 1982-436X. Available under: doi: 10.1590/S1679-87592012000100007BibTex
@article{Pagliosa2012-03Influ-50664,
year={2012},
doi={10.1590/S1679-87592012000100007},
title={Influence of piers on functional groups of benthic primary producers and consumers in the channel of a subtropical coastal lagoon},
number={1},
volume={60},
issn={1679-8759},
journal={Brazilian Journal of Oceanography},
pages={65--73},
author={Pagliosa, Paulo Roberto and Cantor, Mauricio and Scherner, Fernando and Otegui, Mariana Beatriz Paz and Lemes-Silva, Aurea Luiza and Martins, Cintia Dalcuche Leal and Alves, Giorgia Freitas and Fonseca, Alessandra and Horta Jr, Paulo Antunes}
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<dcterms:abstract xml:lang="eng">Artificial habitats have become common in coastal areas worldwide and may influence the structure and functioning of benthic ecosystems. We analyze the influence of piers on the benthic morphofunctional groups of rocky seaweeds and of soft bottom macrofauna in the channel of Conceição Lagoon (southern Brazil). The main impact is a reduction in the luminosity available for photosynthetic activity which is directly related to a decrease in the biomasses of sediment microphytobenthos and of more highly structured macroalgae life-forms. Contrary to expectations, the morphotypes of potentially high biomass productivity, such as articulated coralline, corticated and leathery macroalgae, were in general less abundant and the low biomass foliose and filamentous macroalgae occurred in reference areas but not under the piers. The piers' effects on motile epifauna and infauna functional groups were site-specific and probably related to the general reduction in primary producer organisms in the new habitats. The discretely motile infauna was the only functional group able to thrive under the piers due to their reduced motility and fragile morphological structures, being benefited by the shelter provided by the artificial habitats. Our results showed that the piers might have a negative effect on the base-trophic level organisms responsible for bottom-up controls.</dcterms:abstract>
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