We present an ecophysiological model of the bivalve Cerastoderma edule that simulates individual ... more We present an ecophysiological model of the bivalve Cerastoderma edule that simulates individual growth and reproduction under ambient conditions in temperature and food availability in the Oosterschelde estuary, SW Netherlands. The model contains feedback loops in the uptake and metabolism of food and in the partitioning of carbon to the internal state variables: somatic tissue, storage, organic shell matrix and gametes.The model was calibrated for 24 parameters, based on random distributions of parameter values. This procedure includes an estimate of confidence intervals of the output variables. The simulated growth of shell length and animal wet and dry weight reflected the observed values of growth in the field for the period 1993 – 1997. The model is a tool for the integration of ecophysiological knowledge of this species and also for carrying-capacity studies of shellfish culture and for environmental management of populations in estuarine and coastal areas.
Journal of Experimental Marine Biology and Ecology, 2004
Spisula subtruncata is an infaunal filter-feeding bivalve, which lives in shallow sandy bottoms (... more Spisula subtruncata is an infaunal filter-feeding bivalve, which lives in shallow sandy bottoms (2–20 m depth) from Norway to the Atlantic coasts of Morocco, including the Mediterranean Sea. Considering that fisheries of this species have become an important economic resource in some European countries (e.g. The Netherlands), it is of great interest to know the seasonal variation in its physiological energetics. For this purpose, individuals of S. subtruncata were collected and maintained under ambient temperature and seawater conditions of Dutch coastal waters. Physiological processes related to the acquisition and utilisation of energy (e.g. clearance rate [CR], absorption and oxygen uptake) were measured under ambient conditions of the period March 1999 to February 2000. Mean annual clearance and respiration rates (RR) were 0.99 l h−1 and 0.23 ml O2 h−1 for a standard individual of 250 mg. Values for both clearance and respiration rate were high during spring and summer and low during autumn and winter. Stepwise multiple regression analyses indicated a significant relationship of the clearance rate with temperature and particulate organic matter (POM), whereas respiration rate was significantly related to temperature, absorption rate (AR) of the animals and their reproductive condition. Absorption efficiency (AE) of the food was significantly related to food quality. Scope for growth (SFG) of S. subtruncata, as well as flesh weight of the animals, was high in summer and low in winter.
ABSTRACT The occurrence of a living population of the giant deep-sea oyster Neopycnodonte zibrowi... more ABSTRACT The occurrence of a living population of the giant deep-sea oyster Neopycnodonte zibrowii is reported on the slopes of Hespérides Mud Volcano Complex in the Gulf of Cádiz, south-western Iberian Peninsula, in 720 m depth. A noteworthy circumstance of this new record is its situation on a sea bottom which was suitable for the operation of a rock dredge and does not apparently feature abrupt cliffs or rocky overhangs as in previous reports on the species.
The neritid Smaragdia viridis represents the only known native marine mollusc that feeds on seagr... more The neritid Smaragdia viridis represents the only known native marine mollusc that feeds on seagrass tissues in the European coasts, displaying a strong association with the seagrasses Cymodocea nodosa and Zostera marina in southern Spain. Seasonal dynamics, shell and radular morphology, growth and feeding of this gastropod have been studied in relation to each seagrass species for contrasting trends resulting from a different type of substrate and food source. In both seagrass species, stable populations of this gastropod occur at similar densities and displaying similar growth rates. Nevertheless shells of individuals from C. nodosa are narrower than those from Z. marina and some differences, possibly a consequence of increased wearing on C. nodosa, were noted amongst the radulae. In C. nodosa, a pre-ingestive selection for young epidermal tissues occurs as it was previously observed in Z. marina. The ingestion rate is higher in C. nodosa than in Z. marina but the absorption of ingested tissues is lower in the former. If both seagrasses are present, most individuals ingested preferentially Z. marina rather than C. nodosa, probably due to the lower digestibility of the epidermal tissues in the latter. Seagrass beds, especially those of Z. marina, are suffering a strong regression in southern Spain and the presence of stable populations of this neritid may be restricted to other declining seagrass species in the area.► Shell morphology, growth and feeding of a micrograzer were studied on two seagrasses. ► Shell and radular morphology are different amongst seagrasses. ► Ingestion is higher in Cymodocea nodosa but absorption is higher in Zostera marina. ► A preference for Zostera marina occurs when both seagrasses are available. ► Growth in both seagrasses is similar, suggesting similar benefits for the neritid.
... Sea. It is one of the dominant molluscs in Zostera marina beds in both the Atlantic Ocean (Hi... more ... Sea. It is one of the dominant molluscs in Zostera marina beds in both the Atlantic Ocean (Hily et al., 2004; Quintas, personal communication) and in the Alboran Sea (García-Raso et al., 2004; Arroyo et al., 2006). ... availability. Hily et al. ...
Page 1. Botanica Marina 51 (2008): 92102 2008 by Walter de Gruyter Berlin New York. DOI 10.1... more Page 1. Botanica Marina 51 (2008): 92102 2008 by Walter de Gruyter Berlin New York. DOI 10.1515/BOT.2008.016 Article in press - uncorrected proof 2008/68 Seasonal variation in a deep subtidal Zostera marina L. bed in southern Spain (western Mediterranean Sea) ...
Cambridge Journals Online (CJO) is the e-publishing service for over 270 journals published by Ca... more Cambridge Journals Online (CJO) is the e-publishing service for over 270 journals published by Cambridge University Press and is entirely developed and hosted in-house. The platform's powerful capacity and reliable performance are maintained by a combination of our own expertise ...
We present an ecophysiological model of the bivalve Cerastoderma edule that simulates individual ... more We present an ecophysiological model of the bivalve Cerastoderma edule that simulates individual growth and reproduction under ambient conditions in temperature and food availability in the Oosterschelde estuary, SW Netherlands. The model contains feedback loops in the uptake and metabolism of food and in the partitioning of carbon to the internal state variables: somatic tissue, storage, organic shell matrix and gametes.The model was calibrated for 24 parameters, based on random distributions of parameter values. This procedure includes an estimate of confidence intervals of the output variables. The simulated growth of shell length and animal wet and dry weight reflected the observed values of growth in the field for the period 1993 – 1997. The model is a tool for the integration of ecophysiological knowledge of this species and also for carrying-capacity studies of shellfish culture and for environmental management of populations in estuarine and coastal areas.
Journal of Experimental Marine Biology and Ecology, 2004
Spisula subtruncata is an infaunal filter-feeding bivalve, which lives in shallow sandy bottoms (... more Spisula subtruncata is an infaunal filter-feeding bivalve, which lives in shallow sandy bottoms (2–20 m depth) from Norway to the Atlantic coasts of Morocco, including the Mediterranean Sea. Considering that fisheries of this species have become an important economic resource in some European countries (e.g. The Netherlands), it is of great interest to know the seasonal variation in its physiological energetics. For this purpose, individuals of S. subtruncata were collected and maintained under ambient temperature and seawater conditions of Dutch coastal waters. Physiological processes related to the acquisition and utilisation of energy (e.g. clearance rate [CR], absorption and oxygen uptake) were measured under ambient conditions of the period March 1999 to February 2000. Mean annual clearance and respiration rates (RR) were 0.99 l h−1 and 0.23 ml O2 h−1 for a standard individual of 250 mg. Values for both clearance and respiration rate were high during spring and summer and low during autumn and winter. Stepwise multiple regression analyses indicated a significant relationship of the clearance rate with temperature and particulate organic matter (POM), whereas respiration rate was significantly related to temperature, absorption rate (AR) of the animals and their reproductive condition. Absorption efficiency (AE) of the food was significantly related to food quality. Scope for growth (SFG) of S. subtruncata, as well as flesh weight of the animals, was high in summer and low in winter.
ABSTRACT The occurrence of a living population of the giant deep-sea oyster Neopycnodonte zibrowi... more ABSTRACT The occurrence of a living population of the giant deep-sea oyster Neopycnodonte zibrowii is reported on the slopes of Hespérides Mud Volcano Complex in the Gulf of Cádiz, south-western Iberian Peninsula, in 720 m depth. A noteworthy circumstance of this new record is its situation on a sea bottom which was suitable for the operation of a rock dredge and does not apparently feature abrupt cliffs or rocky overhangs as in previous reports on the species.
The neritid Smaragdia viridis represents the only known native marine mollusc that feeds on seagr... more The neritid Smaragdia viridis represents the only known native marine mollusc that feeds on seagrass tissues in the European coasts, displaying a strong association with the seagrasses Cymodocea nodosa and Zostera marina in southern Spain. Seasonal dynamics, shell and radular morphology, growth and feeding of this gastropod have been studied in relation to each seagrass species for contrasting trends resulting from a different type of substrate and food source. In both seagrass species, stable populations of this gastropod occur at similar densities and displaying similar growth rates. Nevertheless shells of individuals from C. nodosa are narrower than those from Z. marina and some differences, possibly a consequence of increased wearing on C. nodosa, were noted amongst the radulae. In C. nodosa, a pre-ingestive selection for young epidermal tissues occurs as it was previously observed in Z. marina. The ingestion rate is higher in C. nodosa than in Z. marina but the absorption of ingested tissues is lower in the former. If both seagrasses are present, most individuals ingested preferentially Z. marina rather than C. nodosa, probably due to the lower digestibility of the epidermal tissues in the latter. Seagrass beds, especially those of Z. marina, are suffering a strong regression in southern Spain and the presence of stable populations of this neritid may be restricted to other declining seagrass species in the area.► Shell morphology, growth and feeding of a micrograzer were studied on two seagrasses. ► Shell and radular morphology are different amongst seagrasses. ► Ingestion is higher in Cymodocea nodosa but absorption is higher in Zostera marina. ► A preference for Zostera marina occurs when both seagrasses are available. ► Growth in both seagrasses is similar, suggesting similar benefits for the neritid.
... Sea. It is one of the dominant molluscs in Zostera marina beds in both the Atlantic Ocean (Hi... more ... Sea. It is one of the dominant molluscs in Zostera marina beds in both the Atlantic Ocean (Hily et al., 2004; Quintas, personal communication) and in the Alboran Sea (García-Raso et al., 2004; Arroyo et al., 2006). ... availability. Hily et al. ...
Page 1. Botanica Marina 51 (2008): 92102 2008 by Walter de Gruyter Berlin New York. DOI 10.1... more Page 1. Botanica Marina 51 (2008): 92102 2008 by Walter de Gruyter Berlin New York. DOI 10.1515/BOT.2008.016 Article in press - uncorrected proof 2008/68 Seasonal variation in a deep subtidal Zostera marina L. bed in southern Spain (western Mediterranean Sea) ...
Cambridge Journals Online (CJO) is the e-publishing service for over 270 journals published by Ca... more Cambridge Journals Online (CJO) is the e-publishing service for over 270 journals published by Cambridge University Press and is entirely developed and hosted in-house. The platform's powerful capacity and reliable performance are maintained by a combination of our own expertise ...
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Papers by José L. Rueda