Chemoreceptor Cells in Aquatic Invertebrates: Peripheral Mechanisms of Chemical Signal Processing in Decapod Crustaceans

Derby, Charles D.; Atema, Jelle

doi:10.1007/978-1-4612-3714-3_14

Cited by 54 publications

(43 citation statements)

References 48 publications

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“…Responses to polar molecules 1 to 10 kDa have repeatedly been demonstrated in physiological assays, although most investigations generally have not utilized potential stimulants larger than this range . Crustacean chemosensors typically are responsive to a small number of different compounds, with individual chemosensors expressing sensitivity to different suites of chemical signals (Derby & Atema 1988). Thus, it is not particularly surprising to observe that some sensors respond to fractions that, in general, evoke little response from the majority of cells, and our working hypothesis is that water-soluble molecules between 1 and 10 kDa are the major sources of chemosensory information for salmon lice.…”

Section: Discussionmentioning

confidence: 94%

“…Different sensors along the same appendage show overlapping but not identical peak sensitivities, allowing the concentration range encoded by a population of neurons to exceed the capability of each individual neuron (Derby & Atema 1982, Derby & Steullet 2001. Although there is little available data on the physiological response of copepods to water-soluble chemical signals such as amino acids, most larger crustaceans have been shown to respond to micromolar or nanomolar concentrations of these chemicals with some investigators reporting thresholds as low as 10 -6 to 10 -7 M (Derby & Atema 1988).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Chemoreception in the salmon louse Lepeophtheirus salmonis: an electrophysiology approach

Fields

Weissburg²,

Browman³

2007

Dis. Aquat. Org.

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The search for effective and long-term solutions to the problems caused by salmon lice Lepeophtheirus salmonis (Krøyer, 1837) has increasingly included biological/ecological mechanisms to combat infestation. One aspect of this work focuses on the host-associated stimuli that parasites use to locate and discriminate a compatible host. In this study we used electrophysiological recordings made directly from the antennule of adult lice to investigate the chemosensitivity of L salmonis to putative chemical attractants from fish flesh, prepared by soaking whole fish tissue in seawater. There was a clear physiological response to whole fish extract (WFX) with threshold sensitivity at a dilution of 10 -4. When WFX was size fractionated, L. salmonis showed the greatest responses to the water-soluble fractions containing compounds between 1 and 10 kDa. The results suggest that the low molecular weight, water-soluble compounds found in salmon flesh may be important in salmon lice host choice.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Chemoreception in the salmon louse Lepeophtheirus salmonis: an electrophysiology approach

Fields

Weissburg²,

Browman³

2007

Dis. Aquat. Org.

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“…The identity of both the excitatory and inhibitory (aversive) chemicals mediating blue crab responses to food and predation risk are unknown, but attractive molecules, at least, are numerous. Crustaceans are responsive to a wide variety of attractive components in food, including amino acids, sugars, nucleotides and other compounds (Carr and Derby, 1986;Derby and Atema, 1988;Zimmer-Faust, 1989). Although the specific substances that elicit tracking are unknown, the large number of stimulatory molecules suggests attraction is mediated by chemical blends.…”

Section: Discussionmentioning

confidence: 99%

Dine or dash? Turbulence inhibits blue crab navigation in attractive–aversive odor plumes by altering signal structure encoded by the olfactory pathway

Weissburg

Atkins

Berkenkamp

et al. 2012

Journal of Experimental Biology

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SUMMARYBlue crabs can distinguish and navigate to attractive (food) odors even when aversive odors (injured crab metabolites) are released nearby. Blue crabs in these conditions detect the aversive odor and avoid it, but find the attractive source with nearly the same success rate as when the attractive source is presented alone. Spatially and temporally distinct odor filaments appear to signal to foragers that the two odor sources are not co-located, and hence navigating to the attractive odor entails an acceptable risk of predation. However, environmentally produced turbulence suppresses tracking by homogenizing the two odors; blue crabs fail to track to the attractive source when the aversive source is present, even though turbulence does not substantially inhibit tracking to the attractive source alone. Removal of sensory input from aesthetascs on the antennules, but not chemosensors on the legs, rescues navigation to attractive-aversive dual plumes in turbulent conditions. These results suggest that mixing in the natural environment may amplify the effects of predators by suppressing tracking to food odors when aversive cues are present, and that the olfactory pathway mediates the response.

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“…Taking the neurophysiological detection threshold for the amino acid, serine, determined with electroantennograms to be around 10 79 M (¢gure 7), the original concentration could be back-calculated to 4.5 Â10 79 for the patch or 10 78 M for the plume. However, as behavioural thresholds are most commonly 1^3 orders of magnitude greater than physiological thresholds (Derby & Atema 1988), a more conservative approach would be to assume that the lower limits of detection are in the order of 10 77 M so that the concentration released by the female can be at a level of 10 76 M. In either case, these concentrations are still well within estimates for concentrations released by zooplankton or around swarms, or found to stimulate swarming behaviour (10 73 to 10 78 M: Williams & Muir 1981;Poulet & Ouellet 1982;Wheeler 1983;Poulet et al 1991). Thus, production of an amino acid odour trail may be possible, although we cannot rule out the existence of more speci¢c signal molecules from other chemical classes.…”

Section: (Iii) Edge Detectionmentioning

confidence: 99%

The fluid physics of signal perception by mate-tracking copepods

Yen

Weissburg

Doall

1998

Phil. Trans. R. Soc. Lond. B

111

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Within laboratory-induced swarms of the marine copepod Temora longicornis, the male exhibits chemically mediated trail-following behaviour, concluding with £uid mechanical provocation of the mate-capture response.The location and structure of the invisible trail were determined by examining the speci¢c behaviour of the female copepods creating the signal, the response of the male to her signal, and the £uid physics of signal persistence. Using the distance of the mate-tracking male from the ageing trail of the female, we estimated that the molecular di¡usion coe¤cient of the putative pheromonal stimulant was 2.7 Â10 À5 cm 2 s À1 , or 1000 times slower than the di¡usion of momentum. Estimates of signal strength levels, using calculations of di¡usive properties of odour trails and attenuation rates of £uid mechanical signals, were compared to the physiological and behavioural threshold detection levels. Males ¢nd trails because of strong across-plume chemical gradients; males sometimes go the wrong way because of weak along-plume gradients; males lose the trail when the female hops because of signal dilution; and mate-capture behaviour is elicited by suprathreshold £ow signals. The male is stimulated by the female odour to accelerate along the trail to catch up with her, and the boundary layer separating the signal from the chemosensitive receptors along the copepod antennule thins. Di¡usion times, and hence reaction times, shorten and behavioural orientation responses can proceed more quickly. While`perceptive' distance to the odour signal in the trail or the £uid mechanical signal from the female remains within 1^2 body lengths (55 mm), the`reactive' distance between males and females was an order of magnitude larger. Therefore, when nearest-neighbour distances are 5 cm or less, as in swarms of 10 4 copepods m À3 , mating events are facilitated. The strong similarity in the structure of mating trails and vortex tubes (isotropic, millimetre^centimetre scale, 10:1 aspect ratio, 10 s persistence), indicates that these trails are constrained by the same physical forces that in£uence water motion in a low Reynolds number £uid regime, where viscosity limits forces to the molecular scale. The exploratory reaches of mating trails appear inscribed within Kolmogorov eddies and may represent a measure of eddy size. Biologically formed mating trails, however, are distinct in their £ow velocity and chemical composition from common small-scale turbulent features; and mechanoreceptive and chemoreceptive copepods use their senses to discriminate these di¡erences. Zooplankton are not aimless wanderers in a featureless environment. Their ambit is replete with clues that guide them in their e¡orts for survival in the ocean.

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Chemoreceptor Cells in Aquatic Invertebrates: Peripheral Mechanisms of Chemical Signal Processing in Decapod Crustaceans

Cited by 54 publications

References 48 publications

Chemoreception in the salmon louse Lepeophtheirus salmonis: an electrophysiology approach

Chemoreception in the salmon louse Lepeophtheirus salmonis: an electrophysiology approach

Dine or dash? Turbulence inhibits blue crab navigation in attractive–aversive odor plumes by altering signal structure encoded by the olfactory pathway

The fluid physics of signal perception by mate-tracking copepods

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