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Adult Pacific Oyster (Crassostrea gigas) May Have Light Sensitivity.

Wu C, Wang J, Yang Y, Li Z, Guo T, Li Y, Wang X - PLoS ONE (2015)

Bottom Line: One LED flashlight was used to shine light onto adult oysters while they were filtering seawater through their shell openings.We found that the degree of opening increased gradually during the light period but rapidly decreased when the flashlight was turned off in the treated group but not in the control group.These results suggest that adult Pacific oyster may be sensitive to light.

View Article: PubMed Central - PubMed

Affiliation: School of Agriculture, Ludong University, Yantai, 264025, China.

ABSTRACT
Light-sensitivity is an important aspect of mollusk survival as it plays a vital role in reproduction and predator avoidance. In the Pacific oyster Crassostrea gigas light sensitivity has been demonstrated in the larval stage but has not yet been conclusively demonstrated in adult oysters. In this paper we describe an experiment which was undertaken to determine if adult Pacific oysters were sensitive to light. One LED flashlight was used to shine light onto adult oysters while they were filtering seawater through their shell openings. We found that the degree of opening increased gradually during the light period but rapidly decreased when the flashlight was turned off in the treated group but not in the control group. These results suggest that adult Pacific oyster may be sensitive to light.

No MeSH data available.


Related in: MedlinePlus

Responses of oysters to turning the flashlight on and off.1, oyster filtering seawater with a slightly-opened shell prior to switch-on; 2, oyster immediately after switch-on; 3, oyster beginning to open its shells during switch-on; 4, oyster with a wider shell opening during switch-on; 5, oyster beginning to close its shell following switch-off; 6, reduction in size of shell opening following the disappearance of flashlights for several seconds. The ‘switch-on’ indicates the time when the flashlight is switched on; ‘switch-off’ indicates the time when the flashlight is switched off.
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pone.0140149.g001: Responses of oysters to turning the flashlight on and off.1, oyster filtering seawater with a slightly-opened shell prior to switch-on; 2, oyster immediately after switch-on; 3, oyster beginning to open its shells during switch-on; 4, oyster with a wider shell opening during switch-on; 5, oyster beginning to close its shell following switch-off; 6, reduction in size of shell opening following the disappearance of flashlights for several seconds. The ‘switch-on’ indicates the time when the flashlight is switched on; ‘switch-off’ indicates the time when the flashlight is switched off.

Mentions: Some oysters responded to light when the flashlight was shone on them while they were filtering the seawater by increasing the size of the gap between the valves constantly and slowly to a larger or lesser extent. When the flashlight was switched off (Fig 1) some oysters responded by dramatically reducing or completely closing the gap between the valves. No oyster in the control groups showed such responses. A video of an oyster responding to light as example has been presented in S1 Video. The treated and control group differed significantly from each other in their responses to light, regardless of the sampling location (Table 1).


Adult Pacific Oyster (Crassostrea gigas) May Have Light Sensitivity.

Wu C, Wang J, Yang Y, Li Z, Guo T, Li Y, Wang X - PLoS ONE (2015)

Responses of oysters to turning the flashlight on and off.1, oyster filtering seawater with a slightly-opened shell prior to switch-on; 2, oyster immediately after switch-on; 3, oyster beginning to open its shells during switch-on; 4, oyster with a wider shell opening during switch-on; 5, oyster beginning to close its shell following switch-off; 6, reduction in size of shell opening following the disappearance of flashlights for several seconds. The ‘switch-on’ indicates the time when the flashlight is switched on; ‘switch-off’ indicates the time when the flashlight is switched off.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608825&req=5

pone.0140149.g001: Responses of oysters to turning the flashlight on and off.1, oyster filtering seawater with a slightly-opened shell prior to switch-on; 2, oyster immediately after switch-on; 3, oyster beginning to open its shells during switch-on; 4, oyster with a wider shell opening during switch-on; 5, oyster beginning to close its shell following switch-off; 6, reduction in size of shell opening following the disappearance of flashlights for several seconds. The ‘switch-on’ indicates the time when the flashlight is switched on; ‘switch-off’ indicates the time when the flashlight is switched off.
Mentions: Some oysters responded to light when the flashlight was shone on them while they were filtering the seawater by increasing the size of the gap between the valves constantly and slowly to a larger or lesser extent. When the flashlight was switched off (Fig 1) some oysters responded by dramatically reducing or completely closing the gap between the valves. No oyster in the control groups showed such responses. A video of an oyster responding to light as example has been presented in S1 Video. The treated and control group differed significantly from each other in their responses to light, regardless of the sampling location (Table 1).

Bottom Line: One LED flashlight was used to shine light onto adult oysters while they were filtering seawater through their shell openings.We found that the degree of opening increased gradually during the light period but rapidly decreased when the flashlight was turned off in the treated group but not in the control group.These results suggest that adult Pacific oyster may be sensitive to light.

View Article: PubMed Central - PubMed

Affiliation: School of Agriculture, Ludong University, Yantai, 264025, China.

ABSTRACT
Light-sensitivity is an important aspect of mollusk survival as it plays a vital role in reproduction and predator avoidance. In the Pacific oyster Crassostrea gigas light sensitivity has been demonstrated in the larval stage but has not yet been conclusively demonstrated in adult oysters. In this paper we describe an experiment which was undertaken to determine if adult Pacific oysters were sensitive to light. One LED flashlight was used to shine light onto adult oysters while they were filtering seawater through their shell openings. We found that the degree of opening increased gradually during the light period but rapidly decreased when the flashlight was turned off in the treated group but not in the control group. These results suggest that adult Pacific oyster may be sensitive to light.

No MeSH data available.


Related in: MedlinePlus