Zhao C et al. (2014), Effects of covering behavior and exposure to a ...

ECB-ART-43413

PLoS One 2014 Jan 01;95:e97840. doi: 10.1371/journal.pone.0097840.

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Effects of covering behavior and exposure to a predatory crab Charybdis japonica on survival and HSP70 expression of juvenile sea urchins Strongylocentrotus intermedius.

Zhao C , Ji N , Zhang B , Sun P , Feng W , Wei J , Chang Y .

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Predation is a complex process among predator, prey and environment. Juvenile sea urchins are more susceptible to predators than adults, which affects community structure. Behavior is involved in anti-predator responses by changes in the expression of anti-predator responsive genes. Here, we investigated the effects of exposure to a predatory crab Charybdis japonica and covering behavior on survival and HSP70 expression of juvenile sea urchins Strongylocentrotus intermedius. C. japonica consumed large numbers of juvenile S. intermedius in 12 hours with a mortality of 34.17±11.43%. Covering behavior did not significantly reduce predation. Exposure to C. japonica did not significantly upregulate HSP70 expression of juvenile S. intermedius in 12 hours. Covering behavior showed no significant regulative effect on the gene expression of HSP70 of juvenile S. intermedius exposed to C. japonica for 12 hours. The results indicate that the anti-predator function of covering behavior is limited and that HSP70 expression does not appear to play an important role in the anti-predator process of S. intermedius.

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Genes referenced: LOC100887844 LOC105439191 LOC115925415 LOC115929188

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References [+] :

Briffa, Analysis of the finescale timing of repeated signals: does shell rapping in hermit crabs signal stamina? 2000, Pubmed

	Figure 1. Predation on Strongylocentrotus intermedius with and without covering material (N = 3, mean ± SE).
	Figure 2. Time to first covering of Strongylocentrotus intermedius and number of shells covered per S. intermedius with or without exposure to a predator (N = 3, mean ± SE).N refers to without predator exposure, Y refers to in predator exposure.
	Figure 3. Relative expression of HSP70 in Strongylocentrotus intermedius with or without the covering material and with or without exposure to a predator (N = 3, mean ± SE).N refers to without covering material, Y refers to with covering material.