Modelling spatio-temporal patterns of fish community size structure across the northern Mediterranean Sea: an analysis combining MEDITS survey data with environmental and anthropogenic drivers

Other titles Modelado de patrones espacio-temporales de la estructura de tallas de la comunidad de peces a través del norte del mar Mediterráneo: un análisis combinando datos de campañas MEDITS y factores ambientales y antropogénicos
Type Article
Date 2019-12
Language English
Other localization http://scimar.icm.csic.es/scimar/index.php/secId/7/IdArt/4567/
Author(s) Bitetto Isabella1, Romagnoni Giovanni1, 2, Adamidou Angeliki3, Certain Gregoire4, Di Lorenzo Manfredi5, Donnaloia Marilena1, Lembo Giuseppe1, Maiorano Porzia6, Milisenda Giacomo7, Musumeci Claudia8, Ordines Francesc9, Pesci Paola10, Peristeraki Panagiota11, Pesic Ana12, Sartor Paolo8, Spedicato Maria Teresa1
Affiliation(s) 1 : COISPA Tecnologia & Ricerca, Bari, Italy
2 : Centre for Ecological and Evolutionary Synthesis (CEES), Dept. of Biosciences, University of Oslo, Norway
3 : FRI, Kavala, Greece
4 : UMR MARBEC IFREMER-LHM, Sète, France
5 : Institute for Biological Resources and Marine Biotechnologies, National Research Council (IRBIM-CNR), Via Luigi Vaccara 61, 91026 Mazara del Vallo, TP, Italy.
6 : Dipartimento di Biologia, Bari University of Aldo Moro, Italy.
7 : SZN (Stazione zoologica Anton Dohrn), Dipartimento di ecologia marina integrata, Viale Cristoforo Colombo, 90142 Palermo, Italy
8 : CIBM, Livorno, Italy
9 : Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Palma, 07015 Illes Balears, Spain
10 : Department of Life and Environmental Sciences, University of Cagliari, via T. Fiorelli 1, 09126 Cagliari, Italy.
11 : Hellenic Center of Marine Research, Crete, Greece
12 : University of Montenegro - Institute of Marine Biology, Kotor, Montenegro
Source Scientia Marina (0214-8358) (Departmento de Publicaciones del CSIC), 2019-12 , Vol. 83 , N. S1 , P. 141-151
DOI 10.3989/scimar.05015.06A
Note Mediterranean demersal resources and ecosystems: 25 years of MEDITS trawl surveys M.T. Spedicato, G. Tserpes, B. Mérigot and E. Massutí (eds)
Keyword(s) demersal fish community, size structure indicators, geographical sub-area, Marine Strategy Framework Directive, dynamic factor analysis, redundancy analysis
Abstract

The state of marine systems subject to natural or anthropogenic impacts can be generally summarized by suites of ecological indicators carefully selected to avoid redundancy. Length-based indicators capture the status of fish community structure, fulfilling the Marine Strategy Framework Directive (MSFD) requirement for Descriptor 3 (status of commercial fish species). Although the MSFD recommends the development of regional indicators, a comparison among alternative length-based indicators is so far missing for the Mediterranean Sea. Using principal component analysis and dynamic factor analysis, we identified the most effective subset of length-based indicators, whether or not based on maximum length. Indicator trends and time series of fishing effort and environmental variables are also compared in order to highlight the individual and combined capability of indicators to track system changes across geographical sub-areas. Two indicators, typical length and mean maximum length, constitute the smallest set of non-redundant indicators, capturing together 87.45% of variability. Only in combination can these indicators disentangle changes in the fish community composition from modifications of size structure. Our study supports the inclusion of typical length among the regional MSFD Descriptor 3 indicators for the Mediterranean Sea. Finally, we show dissimilarity between the western and eastern-central Mediterranean, suggesting that there are sub-regional differences in stressors and community responses.

Abstract <p>Generalmente, el estado de los sistemas marinos sujetos a impactos naturales o antropog&eacute;nicos puede ser resumido mediante un conjunto de indicadores ecol&oacute;gicos, cuidadosamente seleccionados para evitar la redundancia. Los indicadores basados en la talla reflejan el estado de la estructura de la comunidad de peces, cumpliendo el requisito de la Directiva Marco de la Estrategia Marina (MSFD) para el Descriptor 3 (estado de las especies de peces comerciales). Si bien MSFD recomienda el desarrollo de indicadores regionales, en el Mar Mediterr&aacute;neo no se ha hecho hasta ahora una comparaci&oacute;n entre los distintos indicadores disponibles basados en la talla. Mediante el an&aacute;lisis de componentes principales y el an&aacute;lisis de factores din&aacute;micos, identificamos el subconjunto m&aacute;s eficaz de indicadores basados en la talla, est&eacute;n o no basados en la talla m&aacute;xima. Las tendencias de los indicadores y las series temporales del esfuerzo de pesca y las variables ambientales tambi&eacute;n son comparadas para resaltar la capacidad individual y combinada de los indicadores para detectar los cambios del sistema a trav&eacute;s de las sub&aacute;reas geogr&aacute;ficas. Dos indicadores, Longitud T&iacute;pica (TyL) y Longitud M&aacute;xima Media (MML), constituyen el conjunto m&aacute;s peque&ntilde;o de indicadores no redundantes, captando juntos el 87.45% de variabilidad. Solo si se combinan, estos indicadores pueden discernir entre los cambios en la composici&oacute;n de la comunidad de peces y las modificaciones de la estructura de tallas. Nuestro estudio respalda la inclusi&oacute;n de TyL entre los indicadores regionales del descriptor 3 de MSFD para el mar Mediterr&aacute;neo. Finalmente, mostramos diferencias entre el Mediterr&aacute;neo occidental y el Mediterr&aacute;neo centraloriental que sugieren diferencias subregionales en cuanto a factores impactantes y las respuestas de la comunidad.</p>
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Bitetto Isabella, Romagnoni Giovanni, Adamidou Angeliki, Certain Gregoire, Di Lorenzo Manfredi, Donnaloia Marilena, Lembo Giuseppe, Maiorano Porzia, Milisenda Giacomo, Musumeci Claudia, Ordines Francesc, Pesci Paola, Peristeraki Panagiota, Pesic Ana, Sartor Paolo, Spedicato Maria Teresa (2019). Modelling spatio-temporal patterns of fish community size structure across the northern Mediterranean Sea: an analysis combining MEDITS survey data with environmental and anthropogenic drivers. Scientia Marina, 83(S1), 141-151. Publisher's official version : https://doi.org/10.3989/scimar.05015.06A , Open Access version : https://archimer.ifremer.fr/doc/00599/71148/