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The effects of starvation and acute low salinity exposure on food intake in the Dungeness crab, Cancer magister

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Abstract

Adult Cancer magister make forays into hyposaline estuarine habitats during times of high food abundance. However, as weak osmoregulators, they are poorly equipped to deal with the concurrent demands of osmoregulation and digestion. Therefore, the potential interaction between nutritional status and feeding in a physiologically challenging environment was investigated. Changes in the proportion of crabs feeding, the amount of food consumed, the time spent feeding, and the efficiency with which a meal was consumed were examined in response to the length and severity of hyposaline exposure, and the duration of starvation. Reductions in the (a) number of animals feeding, (b) the amount of food consumed, and (c) the time spent feeding were observed in salinities where C. magister actively osmoregulates the concentration of its internal fluids. Although this reduction in feeding was likely a stress response, the crabs were able evaluate the level of salinity stress: there was a dose-dependent reduction in feeding, and they were able to discriminate between salinities separated by as little as 3.5‰. The likelihood that animals would feed in low salinity increased with starvation. Thus, the aversion to food uptake in physiologically stressful conditions may be overridden by the need to procure nutrients. In the natural environment, we suggest that C. magister are employing an ‘eat and run’ strategy, moving into the estuary, consuming a meal, and retreating to higher salinities to digest.

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Acknowledgments

We wish to thank the director and staff of the Bamfield Marine Sciences Centre for use of facilities. This work was supported by an NSF grant (IBN #0313765) to IJM and an NSERC postgraduate scholarship to DLC.

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Correspondence to Daniel L. Curtis.

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Communicated by H. O. Pörtner.

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Curtis, D.L., Vanier, C.H. & McGaw, I.J. The effects of starvation and acute low salinity exposure on food intake in the Dungeness crab, Cancer magister . Mar Biol 157, 603–612 (2010). https://doi.org/10.1007/s00227-009-1345-4

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