Investigation of spatiotemporal patterns in mean temperature and mean trophic level of MEDITS survey catches in the Mediterranean Sea

Other titles Investigacion de los patrones espacio-temporales de la temperatura media y el nivel trófico medio de las capturas de la campaña MEDITS en el Mediterráneo
Type Article
Date 2019-12
Language English
Author(s) Peristeraki Panagiota1, 2, Bitetto Isabella3, Carbonara Pierluigi3, Carlucci Roberto4, Certain Gregoire5, de Carlo Francesco6, Gristina Michele7, Kamidis Nikos8, Pesci Paola9, Stagioni Marco10, Valls María11, Tserpes George1
Affiliation(s) 1 : Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, 71003 Heraklion, Greece
2 : University of Crete, Biology Department, Stavrakia, Heraklion, Crete
3 : COISPA Tecnologia and Ricerca Via dei Trulli, 18/20 70126 Bari, Italy.
4 : Department of Biology University of Bari, Italy.
5 : Institut Français de Recherche pour l’Exploitation de la Mer, Departement Ressource Biologique et Environnement, Laboratoire Halieutique Méditerranée, UMR Marbec, Sète, France.
6 : Aplysia soc. coop. r.l., Livorno, Italy
7 : Institute for Coastal Marine Environment (IAMC), National Research Council (CNR), Via L. Vaccara n 61, Mazara del Vallo (TP), 91026, Italy
8 : HAO-Demeter, Fisheries Research Institute, Nea Peramos-Kavala, PC 64007, Greece.
9 : Department of Life and Environmental Sciences, University of Cagliari, via T. Fiorelli 1, 09126 Cagliari, Italy.
10 : Marine Biology and Fisheries Lab Dept. Biological, Geological and Environmental Sciences (BiGeA) Alma Mater Studiorum, University of Bologna, Italy.
11 : Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Baleares, Moll de Ponent s/n. P.O. Box 291, 07080 Palma, Spain
Source Scientia Marina (0214-8358) (Departmento de Publicaciones del CSIC), 2019-12 , Vol. 83 , N. S1 , P. 165-174
DOI 10.3989/scimar.04835.12A
WOS© Times Cited 8
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) mean temperature of the catch, trophic level, bottom temperature, trends, Mediterranean, fishing pressure, sea warming, climate change
Abstract

Mean temperature (MTC) and mean trophic level (MTL) spatiotemporal patterns of MEDITS survey catches were examined in 13 geographic statistical areas (GSAs) of the Mediterranean between 1994 and 2016. The study aimed to detect changes in the demersal community structure related to anthropogenic impacts. A generalized additive modelling approach was used to examine the effects of year and GSA on the MTC and MTL indexes and on bottom temperature by haul. For the MTC index, the year was significant only in 4 GSAs, while for MTL it was significant in 5. Higher MTC values were observed in central and eastern areas. Bottom temperature increased after 2010, and also from west to east and from north to south. Our results indicate that the recently observed increase in bottom sea temperature has not resulted in an immediate response by demersal marine communities, but areas with higher warming rates or shallow depths were found to be more susceptible to sea warming. For MTL, decreasing trends were observed in only 2 GSAs, while the temporal trends observed in 5 GSAs may have reflected changes in fishing activity patterns. However, higher MTL values were observed in GSAs with generally higher exploitation rates, indicating that factors other than fishing play an important structuring role in marine communities. The present results indicate differences among Mediterranean subareas in regard to changes in the community structure attributed to environmental conditions and exploitation patterns and have implications for the ecology and dynamics of the stocks.

Abstract <p>Se analizaron los patrones espaciotemporales de la temperatura media inferida (TMI) y el nivel tr&oacute;fico medio (NTM) de las capturas de la campa&ntilde;a MEDITS en trece &aacute;reas (GSAs) del Mediterr&aacute;neo entre 1994 y 2016. El estudio pretend&iacute;a detectar cambios en la estructura de la comunidad demersal relacionados con impactos antropog&eacute;nicos. Se utiliz&oacute; un modelo aditivo generalizado (GAM) para examinar los efectos del a&ntilde;o y GSA sobre la temperatura del fondo y los &iacute;ndices de TMI y NTM. De las trece GSAs analizadas, el a&ntilde;o y la TMI solo fueron significativos en cuatro y cinco &aacute;reas, respectivamente. Los mayores valores de NTM se observaron en el centro y el este del Mediterr&aacute;neo. La temperatura del fondo aument&oacute; desde el a&ntilde;o 2010, as&iacute; como de oeste a este y de norte a sur. Nuestros resultados indicaron que el reciente incremento de temperatura del fondo observado en el Mediterr&aacute;neo no ha dado lugar a una respuesta inmediata en las comunidades demersales; no obstante, en &aacute;reas con mayores niveles de calentamiento o de menores profundidades las comunidades fueron m&aacute;s susceptibles a dicho calentamiento. En cuanto al NTM, solo se observaron tendencias decrecientes en dos GSAs, mientras que los patrones temporales detectados en cinco GSAs posiblemente reflejaron cambios en la actividad pesquera. Sin embargo, se observaron mayores valores de NTM en GSAs con mayores niveles de explotaci&oacute;n, indicando que otros factores, aparte de la pesca, juegan un papel importante en la estructuraci&oacute;n de las comunidades marinas. Los resultados del estudio indican la existencia de diferencias en la estructura de las comunidades entre sub&aacute;reas del Mediterr&aacute;neo que podr&iacute;an ser atribuidas a diferencias en las condiciones ambientales y en los patrones de explotaci&oacute;n que afectan a la ecolog&iacute;a y din&aacute;mica de los stocks.</p>
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Peristeraki Panagiota, Bitetto Isabella, Carbonara Pierluigi, Carlucci Roberto, Certain Gregoire, de Carlo Francesco, Gristina Michele, Kamidis Nikos, Pesci Paola, Stagioni Marco, Valls María, Tserpes George (2019). Investigation of spatiotemporal patterns in mean temperature and mean trophic level of MEDITS survey catches in the Mediterranean Sea. Scientia Marina, 83(S1), 165-174. Publisher's official version : https://doi.org/10.3989/scimar.04835.12A , Open Access version : https://archimer.ifremer.fr/doc/00489/60054/