Water acidification: effects on the macroalgal community

Porzio, Lucia (2010) Water acidification: effects on the macroalgal community. [Tesi di dottorato] (Inedito)

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Abstract

Recent researches, performed in a naturally acidified site (Castello Aragonese d’Ischia - Gulf of Naples, Italy) where volcanic carbon dioxide vents cause long-term changes in seawater carbonate chemistry, lowering the pH from 8.17 down to 6.57, reveal winners and losers within the benthic community. In the same site, we chose to address the impact of ocean acidification on the algal community with an integrated approach by means of ecological, physiological and molecular tools. Qualitative and quantitative changes in algal composition have been detected. Results showed a less structured community at low pH, characterized by few dominant species and the lack of calcareous taxa. Due to their different tolerance to pH variations, three target species (Sargassum vulgare, Dictyota dichotoma and Jania rubens) have been selected to carry out transplant experiments in order to detect short term stress signals. Variations in fluorometry-derived parameters of the photosynthetic performance of these species were detected in situ at different pH conditions by means of a Diving-PAM. In order to understand if the chronic lowering of pH of this site has promoted any local adaptations (morphological and/or genetic), the Dictyota complex species have been selected. Results indicate that our integrated approach is the key factor leading to understand how these changes can drive deteriorations in the structure and function of algal assemblages under the effects of water acidification.

Tipologia di documento:Tesi di dottorato
Parole chiave:Water acidification; macroalgal communities; ecophysiology; molecular diversity
Settori scientifico-disciplinari MIUR:Area 05 Scienze biologiche > BIO/07 ECOLOGIA
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Ricca, Ezio
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
Arena, Carmen
Stato del full text:Accessibile
Data:Novembre 2010
Numero di pagine:214
Istituzione:Università degli Studi di Napoli Federico II
Dipartimento o Struttura:Biologia strutturale e funzionale
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Scienze biologiche
Denominazione del dottorato:Biologia applicata
Ciclo di dottorato:23
Numero di sistema:8300
Depositato il:02 Dicembre 2010 11:41
Ultima modifica:29 Agosto 2012 13:38

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