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Animal-sediment relationships: Evaluating the ‘Pearson-Rosenberg paradigm’ in Mediterranean coastal lagoons |
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| Authors: | P Magni D Tagliapietra L Balthis S Como G Giordani F Maltagliati A Rismondo P Tomassetti |
| Institution: | a CNR-IAMC, Consiglio Nazionale delle Ricerche, Istituto per l’Ambiente Marino Costiero, Località Sa Mardini, Torregrande, 09072 Oristano, Italy b CNR-ISMAR, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine, Sistemi Marini e Costieri, Riva Sette Martiri 1364/a, 30122 Venice, Italy c Università di Pisa, Dipartimento di Biologia, Via Derna 1, 56126 Pisa, Italy d National Oceanic and Atmospheric Administration (NOAA), National Ocean Service, 219 Ft. Johnson Rd., 29412 Charleston SC, USA e IMC, International Marine Centre, Località Sa Mardini, Torregrande, 09072 Oristano, Italy f Università di Parma, Dipartimento di Scienze Ambientali, Via Usberti 33/A Campus, 43100 Parma, Italy g SELC Società Cooperativa, Via dell’Elettricità 3/d, 30175 Venice-Marghera, Italy h ISPRA, Istituto Superiore per la Protezione e la Ricerca Ambientale, Via di Casalotti 300, 00168 Rome, Italy |
| Abstract: | We investigated the applicability of the Pearson-Rosenberg (P-R) conceptual model describing a generalized pattern of response of benthic communities in relation to organic enrichment to Mediterranean Sea coastal lagoons. Consistent with P-R model predictions, benthic diversity and abundance showed two different peaks at low (>2.5-5 mg g−1) and high (>25-30 mg g−1) total organic carbon (TOC) ranges, respectively. We identified TOC thresholds indicating that risks of reduced benthic diversity should be relatively low at TOC values < about 10 mg g−1, high at TOC values > about 28 mg g−1, and intermediate at values in-between. Predictive ability within these ranges was high based on results of re-sampling simulation. While not a direct measure of causality, it is anticipated that these TOC thresholds should serve as a general screening-level indicator for evaluating the likelihood of reduced sediment quality and associated bioeffects in such eutrophic systems of the Mediterranean Sea. |
| Keywords: | Macrobenthos Ecological indicators Eutrophication Benthic diversity Coastal lagoons Mediterranean Sea |
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