Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast

Soft-bottom polychaete assemblages inhabiting shallow waters of the northern Mediterranean Spanish coast were studied with the objective to elucidate its present structure, distribution and diversity at different scales and with different degree of anthropogenic pressure. Samples were obtained at di...

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Autor: Serrano Samaniego, Letzi Graciela
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:CBUC, CESCA
Repositorio:TDR. Tesis Doctorales en Red
OAI Identifier:oai:www.tdx.cat:10803/96670
Acceso en línea:http://hdl.handle.net/10803/96670
https://dx.doi.org/10.5821/dissertation-2117-94672
Access Level:acceso abierto
Palabra clave:626
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dc.title.none.fl_str_mv Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
title Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
spellingShingle Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
Serrano Samaniego, Letzi Graciela
626
title_short Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
title_full Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
title_fullStr Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
title_full_unstemmed Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
title_sort Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coast
dc.creator.none.fl_str_mv Serrano Samaniego, Letzi Graciela
author Serrano Samaniego, Letzi Graciela
author_facet Serrano Samaniego, Letzi Graciela
author_role author
dc.contributor.none.fl_str_mv Sardá Borroy, Rafael
Universitat Politècnica de Catalunya. Departament d'Enginyeria Hidràulica, Marítima i Ambiental
dc.subject.none.fl_str_mv 626
topic 626
description Soft-bottom polychaete assemblages inhabiting shallow waters of the northern Mediterranean Spanish coast were studied with the objective to elucidate its present structure, distribution and diversity at different scales and with different degree of anthropogenic pressure. Samples were obtained at different depths along the coast between the border of the Spanish-French border to the vicinity of Valencia. Four different studies are presented In the Barcelona case study, we revisited an station 20 years after cessation of impact due to sewage discharges. By 2008, we found benthic recovery and clear increase in complexity and diversity. It changed from an assemblage 98 % dominated by a C. capitata complex to an assemblage dominated by M. fragilis, C. capitata, and O. hartmanni. We found more species and more diversity in trophic groups, whereas the abundance and biomass values were clearly reduced by almost two and one order of magnitude, respectively. Although, as silt-clay content in sediments improved, diminishing from 95 to 25 %, as well as PCBs and PAHs during the period, their metal content was still very high. This situation may inhibit their full recovery to normal conditions. In the Alt Empordà case study, we revisited 42 sampling sites, previously sampled by French scientists in 1970-72. Using the same methodologies we found the Bay of Roses polychaete assemblages belonging to the LFS and LSM communities described by Labrune et al. (2007), a decrease in the number of species and individuals at the shallowest assemblages and similar numbers for the deepest one. D. arietina dominate fine sand sediments while L. latreilli did teh same in sandy mud sediments. In the northeastern part of the Cap de Creus, the number of species and individuals were similar to those described by Desbruyères et al. (1972-73) and other notable differences in species composition were registered. In the regional scale case study, 59 sampling sites were considered in 22 inshore-offshore transects located at depth gradient (10, 20 and 30m) of the LFS community (Labrune et al., 2007) were studied along the North-western Mediterranean portion of coast between the French border and the Valencia City. The spatial distribution, diversity of polychaetes shows maximal and minimal densities and diversities related to other areas of the Mediterranean Sea. Polychaete assemblages found in it study were similar to establish in the vicinity of Gulf of Lions and other areas of the Mediterranean Sea, although in this case, our results do not reveals linked to granulometric parameters, it was related to depth. Finally, a mesoscales survey have been carried out analizing samples from the mouth of the Rhone River (France) to the vicinity of Valencia (Spain), obtained from the LFS community. Polychaete assemblages found at the Littoral sands of the North-western Mediterranean are clearly described by the large presence of D. arietina and O. fusiformis both in abundance and biomass, being this more acute in the stations sample at the Gulf of Lions. In sites where coarse sand sediments were found, near rocky shores or highly dynamic deltas, the LFS community was replaced by the Littoral Coarse Sands community (LCS). The Polychaete fauna was well represented along the Mediterranean Spanish coast. We found an important number of the species that constitute the pool of polychaete species inhabiting shallowest sites of the Western mediterranean. Their heterogeneity, diversity, and species richness could range between low to high, depend on size and composition of sediment, depth, submarine topography and human pressure at localities which it inhabit. The structure and distribution of polychaetes assemblages could be related to other factors besides the factors mentioned above, as nutrient availability closed to river discharges or other top-down and bottom-up biotic factors.
publishDate 2012
dc.date.none.fl_str_mv 2012
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10803/96670
https://dx.doi.org/10.5821/dissertation-2117-94672
url http://hdl.handle.net/10803/96670
https://dx.doi.org/10.5821/dissertation-2117-94672
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv http://creativecommons.org/licenses/by-nc-sa/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 172 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat Politècnica de Catalunya
publisher.none.fl_str_mv Universitat Politècnica de Catalunya
dc.source.none.fl_str_mv TDX (Tesis Doctorals en Xarxa)
reponame:TDR. Tesis Doctorales en Red
instname:CBUC, CESCA
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spelling Distribution of soft-bottom polychaetes assemblages at different scales in shallow waters of the northern mediterranean Spanish coastSerrano Samaniego, Letzi Graciela626Soft-bottom polychaete assemblages inhabiting shallow waters of the northern Mediterranean Spanish coast were studied with the objective to elucidate its present structure, distribution and diversity at different scales and with different degree of anthropogenic pressure. Samples were obtained at different depths along the coast between the border of the Spanish-French border to the vicinity of Valencia. Four different studies are presented In the Barcelona case study, we revisited an station 20 years after cessation of impact due to sewage discharges. By 2008, we found benthic recovery and clear increase in complexity and diversity. It changed from an assemblage 98 % dominated by a C. capitata complex to an assemblage dominated by M. fragilis, C. capitata, and O. hartmanni. We found more species and more diversity in trophic groups, whereas the abundance and biomass values were clearly reduced by almost two and one order of magnitude, respectively. Although, as silt-clay content in sediments improved, diminishing from 95 to 25 %, as well as PCBs and PAHs during the period, their metal content was still very high. This situation may inhibit their full recovery to normal conditions. In the Alt Empordà case study, we revisited 42 sampling sites, previously sampled by French scientists in 1970-72. Using the same methodologies we found the Bay of Roses polychaete assemblages belonging to the LFS and LSM communities described by Labrune et al. (2007), a decrease in the number of species and individuals at the shallowest assemblages and similar numbers for the deepest one. D. arietina dominate fine sand sediments while L. latreilli did teh same in sandy mud sediments. In the northeastern part of the Cap de Creus, the number of species and individuals were similar to those described by Desbruyères et al. (1972-73) and other notable differences in species composition were registered. In the regional scale case study, 59 sampling sites were considered in 22 inshore-offshore transects located at depth gradient (10, 20 and 30m) of the LFS community (Labrune et al., 2007) were studied along the North-western Mediterranean portion of coast between the French border and the Valencia City. The spatial distribution, diversity of polychaetes shows maximal and minimal densities and diversities related to other areas of the Mediterranean Sea. Polychaete assemblages found in it study were similar to establish in the vicinity of Gulf of Lions and other areas of the Mediterranean Sea, although in this case, our results do not reveals linked to granulometric parameters, it was related to depth. Finally, a mesoscales survey have been carried out analizing samples from the mouth of the Rhone River (France) to the vicinity of Valencia (Spain), obtained from the LFS community. Polychaete assemblages found at the Littoral sands of the North-western Mediterranean are clearly described by the large presence of D. arietina and O. fusiformis both in abundance and biomass, being this more acute in the stations sample at the Gulf of Lions. In sites where coarse sand sediments were found, near rocky shores or highly dynamic deltas, the LFS community was replaced by the Littoral Coarse Sands community (LCS). The Polychaete fauna was well represented along the Mediterranean Spanish coast. We found an important number of the species that constitute the pool of polychaete species inhabiting shallowest sites of the Western mediterranean. Their heterogeneity, diversity, and species richness could range between low to high, depend on size and composition of sediment, depth, submarine topography and human pressure at localities which it inhabit. The structure and distribution of polychaetes assemblages could be related to other factors besides the factors mentioned above, as nutrient availability closed to river discharges or other top-down and bottom-up biotic factors.Muestras de sedimento fueron obtenidas a diferentes profundidades a lo largo de la costa, desde la frontera Franco-española hasta las proximidades de Valencia para elucidar la estructura, distribución y diversidad de los poliquetos a diferentes escalas, a diferentes grados de presión antrópica. Cuatro estudios fueron presentados. Caso de estudio Barcelona: revisitamos un punto de muestreo en el año 2008, en una zona sometida al impacto producido por aguas residuales. Después de 20 años del cese de descargas, se observó recuperación y un incremento en la complejidad y diversidad del bentos. La comunidad dominada en el pasado por C. capitata (98%) fue reemplazada por M. fragilis, C. capitata, and O. hartmanni. Encontramos más especies y diversidad de grupos tróficos, y la abundancia y biomasa fueron visiblemente reducidas en al menos uno o dos órdenes de magnitud, respectivamente. El contenido en fango y arcilla en los sedimentos ha mejorado, disminuyendo de 95 a 25%, al igual que los PCBs y PAHs durante este período, sin embargo, el alto contenido en metales puede inhibir la completa recuperación de esta comunidad a condiciones normales. Caso del Alt Empordà: visitamos 42 sitios de muestreo, previamente muestreadas por científicos franceses en 1970-72, encontrando que en la bahía de Rosas las asociaciones de poliquetos pertenecían al litoral de arenas finas LFS y a al litoral de arena y fango LSM descritas por Labrune et al. (2007), también se observó un decrecimiento en el número de especies e individuos pertenecientes a las asociaciones de fondos someros y las asociaciones de zonas más profundas mantuvieron un número similar. La especie D. arietina dominó en los sedimentos finos mientras que L. latreilli hizo lo mismo en fangos arenosos. En el norte del Cap de Creus, el número de especies e individuos fue similar a los descritos por Desbruyères et al. (1972-73) y se observaron notables diferencias en la composición de especies. A escala regional, 59 sitios de muestreo fueron considerados en 22 transectos ubicados en la costa a diferentes gradientes de profundidad (10, 20 y 30 m) en la comunidad de arenas finas LFS (Labrune et al., 2007), a lo largo de la costa noroccidental del Mediterráneo, en las inmediaciones de la frontera con Francia hasta Valencia. La distribución espacial y diversidad de poliquetos indicaron máximas y mínimas densidades en relación a otras áreas del mar Mediterráneo. Las asociaciones de poliquetos encontradas en el estudio fueron similares a las establecidas en las cercanías del Golfo de León y en otras áreas del Mediterráneo. Aunque en este caso, nuestros resultados no indican relación de la fauna con los parámetros granulométricos, si encontramos relación con el gradiente de profundidad. Finalmente a mesoescala, se llevaron a cabo análisis de muestras obtenidas desde la desembocadura del río Rhone (Francia)hasta las cercanías de Valencia, de la comunidad LFS. Las asociaciones de poliquetos encontradas en el litoral de arenas en el Mediterráneo noroccidental fueron claramente descritas por la presencia de D. arietina y O. fusiformis, tanto en abundancia como en biomasa, siendo más visible en las estaciones ubicadas en el Golfo de León. En los sitios de arenas gruesas, cercanas a costas rocosas o deltas altamente dinámicos, la comunidad LFS fue reemplazada por la comunidad del litoral de arenas gruesas (LCS). La fauna de poliquetos en el Mediterráneo español fue elevada,encontrándose un buen número de especies que habitan en los fondos someros. La heterogeneidad, diversidad y riqueza específica en las asociaciones varió en función de la composición del sedimento, profundidad, topografía submarina y presión humana a la que se encuentran sometidos. La estructura, composición y distribución espacial de los poliquetos también podría relacionarse con otros factores como disponiblidad de nutrientes u otras interacciones "top-down" o "top-bottom" relacionados a factores bióticos.DOCTORAT EN CIÈNCIES DEL MAR (Pla 2007)Universitat Politècnica de CatalunyaSardá Borroy, RafaelUniversitat Politècnica de Catalunya. Departament d'Enginyeria Hidràulica, Marítima i Ambiental201220122012info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersion172 p.application/pdfapplication/pdfhttp://hdl.handle.net/10803/96670https://dx.doi.org/10.5821/dissertation-2117-94672TDX (Tesis Doctorals en Xarxa)reponame:TDR. Tesis Doctorales en Redinstname:CBUC, CESCAInglésL'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by-nc-sa/3.0/es/http://creativecommons.org/licenses/by-nc-sa/3.0/es/info:eu-repo/semantics/openAccessoai:www.tdx.cat:10803/966702026-06-14T12:46:07Z
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