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Phytoplankton size-distribution and community structure in relation to mucilage occurrence in the northern Adriatic Sea.
Sci Total Environ. 2005 Dec 15; 353(1-3):204-17.ST

Abstract

The spatial and temporal variations of pico-, nano- and microphytoplankton abundance and composition were investigated over a 37 month period, focusing on the ecological role of different size classes of phytoplankton, and on the changes of the community structure that might occur during periods when large mucilage macroaggregates appear. Samples were collected monthly from June 1999 to July 2002 at 11 stations, along three transects covering the northern Adriatic basin. Highest abundances were observed in late-winter/spring for microphytoplankton (mainly diatoms), in spring-summer for nanophytoplankton, and in summer for picophytoplankton. The autotrophic component was more abundant in the summers of 2000 and 2002 (when large mucilage aggregates occurred) than in the summers of 1999 and 2001 (when a massive phenomenon was not observed). This increase was statistically significant for pico-, nano- and, among microphytoplankton, only for dinoflagellates. Blooms of picophytoplankton were often observed at the bottom layer during mucilage summers. The microphytoplankton community during mucilage phenomena was characterized by a species composition (Chaetoceros spp., Cerataulina pelagica, Pseudo-nitzschia delicatissima, P. pseudodelicatissima, Cylindrotheca closterium, Dactyliosolen fragilissimus) comparable to that observed in summers without extensive mucilage occurrence. However, some species appeared with significantly higher densities in the summers of 2000 and 2002: Ceratium furca, C. closterium, Oxytoxum spp., Hemiaulus hauckii and Gonyaulax fragilis. Microscopic observation of aggregates revealed that the microphytoplankton species composition inside the aggregates was comparable to that observed in the water column, with an enrichment of opportunistic species such as C. closterium and P. delicatissima. The presence of mucilage aggregates affects the phytoplankton populations in the water column, even when aggregates are at early stages. It seems that there is a mutual relationship between phytoplankton and aggregates, i.e., several diatom and dinoflagellate species may contribute to the aggregate formation and enlargement, but mucilage aggregates themselves may also affect the phytoplankton populations, allowing the development of a rich diatom community and in general enhancing nanophytoplankton growth.

Authors+Show Affiliations

Dipartimento di Scienze del mare, Università Politecnica delle Marche, Via Brecce Bianche, 60131, Ancona, Italy. c.totti@univpm.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16213005

Citation

Totti, Cecilia, et al. "Phytoplankton Size-distribution and Community Structure in Relation to Mucilage Occurrence in the Northern Adriatic Sea." The Science of the Total Environment, vol. 353, no. 1-3, 2005, pp. 204-17.
Totti C, Cangini M, Ferrari C, et al. Phytoplankton size-distribution and community structure in relation to mucilage occurrence in the northern Adriatic Sea. Sci Total Environ. 2005;353(1-3):204-17.
Totti, C., Cangini, M., Ferrari, C., Kraus, R., Pompei, M., Pugnetti, A., Romagnoli, T., Vanucci, S., & Socal, G. (2005). Phytoplankton size-distribution and community structure in relation to mucilage occurrence in the northern Adriatic Sea. The Science of the Total Environment, 353(1-3), 204-17.
Totti C, et al. Phytoplankton Size-distribution and Community Structure in Relation to Mucilage Occurrence in the Northern Adriatic Sea. Sci Total Environ. 2005 Dec 15;353(1-3):204-17. PubMed PMID: 16213005.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Phytoplankton size-distribution and community structure in relation to mucilage occurrence in the northern Adriatic Sea. AU - Totti,Cecilia, AU - Cangini,Monica, AU - Ferrari,Carla, AU - Kraus,Romina, AU - Pompei,Marinella, AU - Pugnetti,Alessandra, AU - Romagnoli,Tiziana, AU - Vanucci,Silvana, AU - Socal,Giorgio, Y1 - 2005/10/04/ PY - 2005/10/11/pubmed PY - 2006/8/11/medline PY - 2005/10/11/entrez SP - 204 EP - 17 JF - The Science of the total environment JO - Sci Total Environ VL - 353 IS - 1-3 N2 - The spatial and temporal variations of pico-, nano- and microphytoplankton abundance and composition were investigated over a 37 month period, focusing on the ecological role of different size classes of phytoplankton, and on the changes of the community structure that might occur during periods when large mucilage macroaggregates appear. Samples were collected monthly from June 1999 to July 2002 at 11 stations, along three transects covering the northern Adriatic basin. Highest abundances were observed in late-winter/spring for microphytoplankton (mainly diatoms), in spring-summer for nanophytoplankton, and in summer for picophytoplankton. The autotrophic component was more abundant in the summers of 2000 and 2002 (when large mucilage aggregates occurred) than in the summers of 1999 and 2001 (when a massive phenomenon was not observed). This increase was statistically significant for pico-, nano- and, among microphytoplankton, only for dinoflagellates. Blooms of picophytoplankton were often observed at the bottom layer during mucilage summers. The microphytoplankton community during mucilage phenomena was characterized by a species composition (Chaetoceros spp., Cerataulina pelagica, Pseudo-nitzschia delicatissima, P. pseudodelicatissima, Cylindrotheca closterium, Dactyliosolen fragilissimus) comparable to that observed in summers without extensive mucilage occurrence. However, some species appeared with significantly higher densities in the summers of 2000 and 2002: Ceratium furca, C. closterium, Oxytoxum spp., Hemiaulus hauckii and Gonyaulax fragilis. Microscopic observation of aggregates revealed that the microphytoplankton species composition inside the aggregates was comparable to that observed in the water column, with an enrichment of opportunistic species such as C. closterium and P. delicatissima. The presence of mucilage aggregates affects the phytoplankton populations in the water column, even when aggregates are at early stages. It seems that there is a mutual relationship between phytoplankton and aggregates, i.e., several diatom and dinoflagellate species may contribute to the aggregate formation and enlargement, but mucilage aggregates themselves may also affect the phytoplankton populations, allowing the development of a rich diatom community and in general enhancing nanophytoplankton growth. SN - 0048-9697 UR - https://www.unboundmedicine.com/medline/citation/16213005/Phytoplankton_size_distribution_and_community_structure_in_relation_to_mucilage_occurrence_in_the_northern_Adriatic_Sea_ DB - PRIME DP - Unbound Medicine ER -