Effects of large-scale habitat variability on condition of demersal exploited fish in the north-western Mediterranean

Lloret, Josep; Sola, Luís Gil de; Souplet, Arnauld; Galzin, René

doi:10.1006/jmsc.2002.1294

Cited by 87 publications

(64 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While Merluccius merluccius and Phycis blennoides invest energy in body weight from the very early recruit stage consistent with previous studies (Saborido-Rey and Kjesbu 2005), Micromesistius poutassou does not increase in body condition until they reach the juvenile stage, which reveals a strategy to maximize length growth rather than weight to reduce the chance of being predated by maximizing swimming capacities (Payne et al 2012). These ontogenetic differences in the trade-off in allocation of the surplus energy support that investigating the effect of density-dependent and density-independent mechanisms over different life-stages may veil the real contribution of these variables (e.g., Lloret et al 2002, Sandeman et al 2008.…”

Section: Discussionmentioning

confidence: 87%

“…However, despite the regional density-dependent, environmental and anthropogenic influence on fish condition, general patterns are often elusive with contrasting responses observed between systems and species. This influence varies with the type of condition index analyzed (i.e., morphometric, physiological or biochemical index; Lloret et al 2002), the species analyzed and the biogeographic location (Appendix : Table A1). For example, intra-specific competition has shown opposite influences on body condition, from positive (Orlova et al 2010, Kjesbu et al 2014) to negative (Casini et al 2006, Sandeman et al 2008 or not significant (Carscadden andFrank 2002, Kjesbu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of intra‐specific competition, surface chlorophyll and fishing on spatial variation of gadoid's body condition

et al. 2015

View full text Add to dashboard Cite

Abstract. Fish condition indices can be used as biological indicators of the health of individuals and are influenced by numerous external and internal drivers. Like most essential biological traits, they are very sensitive to the spatial heterogeneity occurring in marine ecosystems, which appears at many observational scales. This brings out different ecological processes that can only be revealed either regionally or locally. The scale-dependent spatial variability concerns not only environmental factors, but also anthropogenic activities such as fishing. Understanding these relationships is crucial for improving the spatial management of marine resources, because fish condition considerably affects the sustainability of populations. We explore the influence of density-dependent (intra-specific competition) and densityindependent variables (surface chlorophyll a concentration and fishing impact) on fish condition of three species of harvested gadoids (Merluccius merluccius, Phycis blennoides and Micromesistius poutassou) of the benthopelagic communities off the Balearic Islands (western Mediterranean). This area is characterized by high spatial heterogeneity in the environmental processes and fishing impact. Results show contrasting responses in body condition to the investigated covariates, with species-specific and ontogenetic differences sensitive to the spatial scale of analysis. Some of these responses occur at regional level, while others are more sensitive to local variation. Intra-specific competition shows a very clear effect, which depends on the ontogeny, identifying aggregation areas for recruits and limitation of resources for older individuals. Surface chlorophyll a has always a species-specific regional effect, despite gadoids have a more benthic behavior. Fishing effort displays a heterogeneous impact on fish condition. While spatially contrasting effects are observed at local scale, non-linear regional patterns occur, with positive effects of fishing pressure at intermediate levels. Models analyzing the influence of external drivers in essential fish biological traits such as body condition should consider the spatial variation in responses, especially in highly heterogeneous areas where anthropogenic activities occur. Failing to do so may hide local ecological processes that can be crucial for the persistence of fish populations, which is of paramount relevance for the regional assessment and spatial management of marine exploited resources.

show abstract

Section: Discussionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Effect of intra‐specific competition, surface chlorophyll and fishing on spatial variation of gadoid's body condition

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The fat content of fishes can be affected by habitat characteristics such as bottom or biotope type and food supply, and thus possesses great potential as a 'marker' of habitat quality and feeding conditions in marine (see e.g. Lloret and Planes, 2003;Shulman et al, 2005;Levi et al, 2005;Lloret et al, 2002Lloret et al, , 2005 and freshwater (see e.g. Clemens and Stevens, 2003;Pothoven et al, 2006) ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Lipid reserves of red mullet (<i>Mullus barbatus</i>) during pre-spawning in the northwestern Mediterranean

Lloret¹,

Demestre²,

Sánchez-Pardo³

2007

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: Lipid reserves are a particularly important attribute of fishes because they have a large influence on growth, reproduction and survival. This study analyses the lipid content of red mullet (Mullus barbatus) pre-spawners in three different areas of the northwestern Mediterranean in relation to trawling activities and river runoff. The muscle lipid was considered as an indicator of the somatic condition of individuals whilst the gonad lipid was used as a proxy of the energy invested in reproduction. The results show that fish with the highest muscle lipid levels inhabited the area where fishing impact was lowest. Since the abundance and biomass of polychaetes, which represent the main food source for red mullet, were found to be lower in trawled zones than in unfished ones, we suggest that differences in the muscle lipid levels between areas might be attributed to variation in prey abundance in relation to fishing impact. However, no impact of river runoff on lipid reserves of red mullet was observed. The results also show that muscle and gonad lipid reserves are not related to each other during pre-spawning.Keywords: ecological physiology, polychaetes, fishing, river runoff, maerl beds. RESUMEN: RESERVAS LIPIDICAS DEL SALMONETE DE FANGO (MULLUS BARBATUS)DURANTE LA PREPUESTA EN EL MEDITERRÀNEO NOROCCIDENTAL. -Las reservas lipídicas constituyen un importante atributo de los peces porque juegan un papel destacado en su crecimiento, reproducción y supervivencia. Este estudio analiza las reservas lipídicas del salmonete de fango (Mullus barbatus) durante la prepuesta en tres áreas diferentes del Mediterráneo noroccidental en relación a la actividad pesquera y las descargas fluviales. Se ha considerado el contenido lipídico en el músculo y en la gónada como indicadores de la condición somática y de la energía invertida en la reproducción de los individuos respectivamente. Los resultados muestran cómo los peces con una cantidad mayor de lípidos en el músculo habitan el área donde el impacto pesquero es menor. Puesto que la abundancia y la biomasa de poliquetos, que constituyen la principal fuente de alimento del salmonete de fango, son inferiores en las zonas afectadas por el arrastre que en las zonas donde no se practica este tipo de pesca, se sugiere que las diferencias en la cantidad de lípidos en el músculo entre las distintas áreas podrían atribuirse a las diferencias en la abundancia de presas, lo cual podría guardar relación con la actividad pesquera. Sin embargo, no se observa impacto alguno de las descargas fluviales sobre las reservas de lípidos del salmonete de fango. Los resultados también muestran cómo los contenidos lipídicos en el músculo y en la gónada de los ejemplares no están relacionados entre sí durante la prepuesta de la especie.Palabras clave: ecofisiología, poliquetos, pesquerías, descargas fluviales, fondos de maerl.

show abstract

“…Better condition in some fishes, modelled by lipid reserves, has been related to high productivity areas (Lloret et al, 2002, Lloret et al, 2005. This better condition is reflected not only in the condition index, but also in the allometric growth parameter.…”

Section: Discussionmentioning

confidence: 99%

Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca <i>Parapenaeus longirostris</i> (Crustacea: Decapoda) en el Mediterráneo occidental

Guijarro¹,

Massutí²,

Moranta³

et al. 2009

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: The deep-water rose shrimp Parapenaeus longirostris is a demersal decapod crustacean that is commercially exploited by trawl fleets. The present work compares its population dynamics, biology and condition in two locations (southern and north-western Mallorca in the Balearic Islands, western Mediterranean, separated by a distance of 120 km) with different environmental conditions and explores the relationships between the species and certain environmental factors. Six multidisciplinary bimonthly surveys were carried out during 2003 and 2004 in these two locations (between 150 and 750 m depth) in order to collect data on the demersal species with bottom trawl, the hydrography (temperature and salinity) with CTD casts, and trophic resources (zooplankton in the water column and suprabenthos with Bongo net and Macer-GIROQ sledge respectively) and sediments with a Shipeck dredge. The trawl fleets from both locations were monitored by monthly on board sampling and daily landings obtained from sales bills. Additional data was obtained from other trawl surveys. Temporal differences were detected both annually, with a decreasing trend over the last years in species abundance, and seasonally, in the biological indexes analysed. Bathymetric differences were also found in abundance, mean length, sex-ratio and condition of females. There were clear differences between the two locations studied, with higher abundance, condition and mean length and a lower length at first maturity for females in the north-western location. Trophic conditions could act as a link between geo-physical and biological changes. These short spatio-temporal differences could be due to the higher productivity found at this location, with higher density of preferred prey for the studied species together with adequate seafloor topography, sediment composition and hydrographical characteristics.Keywords: Parapenaeus longirostris, reproduction, fishery, spatio-temporal variations, hydrography, bottom characteristics, prey availability. RESUMEN:Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca ParaPenaeus longirostris (Crustacea: Decapoda) en el Mediterráneo occidental. -La gamba blanca Parapenaeus longirostris es un crustáceo decápodo demersal explotado comercialmente por la flota de arrastre. Este trabajo tiene como objetivo comparar su dinámica poblacional, biología y condición en dos localidades (situadas al sur y al noroeste de Mallorca en las Islas Baleares, Mediterráneo occidental, separadas por 120 km de distancia) con diferentes condiciones ambientales y explorar las relaciones entre la especie y algunos factores ambientales. Se realizaron seis campañas multidisciplinares bimensuales durante 2003 y 2004 en estas dos localidades (entre 150 y 750 m de profundidad) para obtener datos de las especies demersales con arrastre de fondo, de la hidrografía (temperatura y salinidad) con registros de CTD, de los recursos tróficos (zooplancton de la columna de agua y suprabentos, con una red Bongo...

show abstract

Effects of large-scale habitat variability on condition of demersal exploited fish in the north-western Mediterranean

Cited by 87 publications

References 38 publications

Effect of intra‐specific competition, surface chlorophyll and fishing on spatial variation of gadoid's body condition

Effect of intra‐specific competition, surface chlorophyll and fishing on spatial variation of gadoid's body condition

Lipid reserves of red mullet (<i>Mullus barbatus</i>) during pre-spawning in the northwestern Mediterranean

Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca <i>Parapenaeus longirostris</i> (Crustacea: Decapoda) en el Mediterráneo occidental

Contact Info

Product

Resources

About