Écophysiologie comparée des mysidacés hemimysis speluncola Ledoyer (Cavernicole) et Leptomysis lingvura G.O. Sars (non cavernicole) respiration et excrétion

Gaudy, R.; Guérin, Jean-Pierre; Pagano, Marc

doi:10.1016/0022-0981(80)90099-4

Cited by 15 publications

(11 citation statements)

References 38 publications

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“…In most of our experiments, effects on respiratory metabolism mainly consisted of inhibition at temperatures where maximum metabolism usually occurs (18 to 20 °C) in this species (Gaudy et al 1980). At 10 °C, metabolic rates were either unchanged or increased.…”

Section: Discussionmentioning

confidence: 97%

“…A series of aquariums served as controls; cadmium chloride was added to the others to a final concentration of 0.1 mg Cd 1-1. Tetramin powder was used as food; its sedimentation was limited by creating artificial turbulence in the aquaria (Gaudy and Gu6rin 1979). Faecal pellets were collected after a 24 h feeding period and counted.…”

Section: Lethal C O N C E N T R a T I O N Of C A D M I U Mmentioning

confidence: 99%

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Sublethal effects of cadmium on respiratory metabolism, nutrition, excretion and hydrolase activity inLeptomysis lingvura (Crustacea: Mysidacea)

Gaudy¹,

Guérin²,

Kerambrun³

1991

Mar. Biol.

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Abstract. The lethal concentration of cadmium was determined for the mysid Leptomysis lingvura G.O. Sars, a Mediterranean species from surface coastal waters, and the effect of sublethal doses on respiration, ammonia excretion, and feeding efficiency at different temperatures, and on activities of 19 hydrolases was tested. Experiments were carried out on individuals collected in spring 1987 near Marseille. At 18 °C, respiration rate was significantly affected only by concentrations > 0.05 mg Cd 1-1. At 0.1 mg Cd 1-1, respiration rate was more significantly depressed at 20 °C than at 10 °C. There was a concomitant decrease in the Qlo rate (by 23 to 59%, according to the particular experiment), indicating a strong synergistic effect of temperature. Ammonia excretion was likewise affected by cadmium, also with a concomitant decrease in the Qlo rate (by 34%). Daily faecal pellet production was maximum at 18 °C; it was inhibited by cadmium at temperatures between 14 and 20 °C, and enhanced at extreme temperatures (10 and 22 °C). The assimilation efficiency of contaminated individuals was reduced by 9%. These decreases in faecal pellet production and assimilation efficiency reflect a significant decrease in energy (by about 43%) which could rapidly lead to an unbalanced energy budget with a consecutive lowering of the reproductive potential. Generally, hydrolase activities usually increased initially in the presence of 0.2rag Cd1-1, but after 48 h they declined, reaching very low values at 72 h. Most physiological processes are therefore affected by exposure to cadmium and the unbalanced energy budget arises from the inability to utilize environmental food. These results are consistent with the literature data on cadmium contamination in marine organisms. Physiological and biochemical changes appear to be very informative in studies of in vitro sublethal effects ofmicropollutants and in situ environmental modifications.

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Section: Discussionmentioning

confidence: 97%

Section: Lethal C O N C E N T R a T I O N Of C A D M I U Mmentioning

confidence: 99%

Sublethal effects of cadmium on respiratory metabolism, nutrition, excretion and hydrolase activity inLeptomysis lingvura (Crustacea: Mysidacea)

Gaudy¹,

Guérin²,

Kerambrun³

1991

Mar. Biol.

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“…Level of significance: *p < 0.05, **p < 0.01, ***p < 0.001. See Table 2 for further abbreviations plankton such as harpacticoid copepods (Gaudy & Guérin 1979). The migratory habits, isotopic compositions, and previously published observations all point towards a phytoplankton-and zooplanktonbased diet obtained outside the caves, the proportion of which may vary seasonally, regionally, or even from cave to cave.…”

Section: Feeding Behavior Of Cave-dwelling Mysidsmentioning

confidence: 99%

Feeding strategies and resource partitioning mitigate the effects of oligotrophy for marine cave mysids

Rastorgueff¹,

Harmelin-Vivien²,

Richard³

et al. 2011

Mar. Ecol. Prog. Ser.

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We investigated how large populations of several mysid species can coexist in oligotrophic underwater marine caves and their relationships in the marine cave food web using carbon and nitrogen stable isotopes. Isotopic signatures indicate food partitioning among the 5 species of cave-dwelling mysids from the northwest Mediterranean Sea we studied. Hemimysis speluncola feeds mainly on phytoplankton and zooplankton from outside the caves, Siriella gracilipes on sedimentary organic matter and zooplankton from outside, Harmelinella mariannae on small cave-dwelling crustaceans, and Hemimysis margalefi and Hemimysis lamornae mediterranea on sedimentary particulate organic matter. These differences in diet could promote coexistence of such diverse and abundant mysid faunas in marine caves by reducing interspecific competition for scarce resources. The analysis of both seston and cave sediments revealed that the quantity and quality of organic matter are strongly reduced in marine caves, suggesting that cavedwelling mysids find most of their food elsewhere. This inference agrees with documented distributions of some of these mysids outside of caves at night where they can feed in the rich littoral zone. These migrations of some species make cave-dwelling mysids important vectors of organic matter transfer from the outside euphotic littoral zone to various locations inside caves. Outside organic matter is then made available to other cave dwellers through mysid fecal pellet production and predation, as suggested by the isotopic compositions of predators like teleost fishes, decapod crustaceans, and carnivorous cladorhizid sponges.

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“…It has been documented to have significant effects on respiration, excretion, behaviour, egg size and growth of Hemimysis speluncola (Macquart-Moulin & Patriti 1966, Gaudy & Guérin 1979, Gaudy et al 1980, Bourdillon & Castelbon 1983, Wittmann 1984. In the present study, a negative relationship seems to exist between the mean sizes of Hemimysis margalefi's samples and water temperature.…”

Section: Influence Of Temperaturementioning

confidence: 99%

Population structure and life history of Hemimysis margalefi (Crustacea: Mysidacea), a thermophilic cave-dwelling species benefiting from the warming of the NW Mediterranean

Lejeusne¹,

Chevaldonné²

2005

Mar. Ecol. Prog. Ser.

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Dark submarine caves are an extreme and fragmented habitat in which mysids (Crustacea: Mysidacea) of the genus Hemimysis can be found. Hemimysis speluncola has long been the dominant mysid species of the NW Mediterranean caves, but with the recent warming of this region, its congener H. margalefi has replaced it. Nothing is known about the biology and ecology of H. margalefi and here, we provide the first information about its demographic structure and reproductive biology in a cave recently affected by the species shift. We conducted monthly sampling for 4 yr in the Jarre Island cave, near Marseilles (France), where a population of H. margalefi established itself in the late 1990s. Population dynamics were followed by monitoring length-frequency histograms and the influence of temperature on several life-history traits was investigated. H. margalefi reproduces all year round and the brood size depends on female size. Recruitment is discontinuous and occurs when post-nauplioid larvae are 1.3 to 2.0 mm long. Four annual and overlapping cohorts (about 6 mo long) underline more intensive periods of breeding. Females can produce up to 2 successive cohorts during their life. Whatever the maturity stage, females present larger sizes than males. Seasonal variations of water temperature have a strong influence on different life-history traits of H. margalefi, such as mean sizes of the different cohorts, length of intermoult stages and growth rate. Some population dynamics features of H. margalefi are a further indication that it is a species with an affinity for warm water, which has recently benefited from the warmer conditions in the NW Mediterranean, colonising new areas and replacing its congener H. speluncola in most of its former range.

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Écophysiologie comparée des mysidacés hemimysis speluncola Ledoyer (Cavernicole) et Leptomysis lingvura G.O. Sars (non cavernicole) respiration et excrétion

Cited by 15 publications

References 38 publications

Sublethal effects of cadmium on respiratory metabolism, nutrition, excretion and hydrolase activity inLeptomysis lingvura (Crustacea: Mysidacea)

Sublethal effects of cadmium on respiratory metabolism, nutrition, excretion and hydrolase activity inLeptomysis lingvura (Crustacea: Mysidacea)

Feeding strategies and resource partitioning mitigate the effects of oligotrophy for marine cave mysids

Population structure and life history of Hemimysis margalefi (Crustacea: Mysidacea), a thermophilic cave-dwelling species benefiting from the warming of the NW Mediterranean

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Écophysiologie comparée des mysidacés hemimysis speluncola Ledoyer (Cavernicole) et Leptomysis lingvura G.O. Sars (non cavernicole) respiration et excrétion

Cited by 15 publications

References 38 publications

Sublethal effects of cadmium on respiratory metabolism, nutrition, excretion and hydrolase activity inLeptomysis lingvura (Crustacea: Mysidacea)

Sublethal effects of cadmium on respiratory metabolism, nutrition, excretion and hydrolase activity inLeptomysis lingvura (Crustacea: Mysidacea)

Feeding strategies and resource partitioning ­mitigate the effects of oligotrophy for marine cave mysids

Population structure and life history of Hemimysis margalefi (Crustacea: Mysidacea), a thermophilic cave-dwelling species benefiting from the warming of the NW Mediterranean

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Feeding strategies and resource partitioning mitigate the effects of oligotrophy for marine cave mysids

Population structure and life history of Hemimysis margalefi (Crustacea: Mysidacea), a thermophilic cave-dwelling species benefiting from the warming of the NW Mediterranean