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Behavioral Response of Invertebrates to Experimental Simulation of Pre-Seismic Chemical Changes.

Grant RA, Conlan H - Animals (Basel) (2015)

Bottom Line: One possible way in which animals could be affected by pre-earthquake processes is via stress activated positive holes leading to the formation of hydrogen peroxide at the rock water interface.Here, we carry out avoidance tests with hydrogen peroxide in two model organisms; Daphnia pulex and earthworms.Daphnia were found to move away from increasing concentrations of H₂O2 but earthworms appeared unaffected.

View Article: PubMed Central - PubMed

Affiliation: Department of Animal and Land Sciences, Hartpury College, Hartpury, Gloucester GL19 3BE, UK. Rachel.grant@hartpury.ac.uk.

ABSTRACT
Unusual behavior before earthquakes has been reported for millennia but no plausible mechanism has been identified. One possible way in which animals could be affected by pre-earthquake processes is via stress activated positive holes leading to the formation of hydrogen peroxide at the rock water interface. Aquatic and fossorial animals could be irritated by H₂O₂ and move down the concentration gradient. Here, we carry out avoidance tests with hydrogen peroxide in two model organisms; Daphnia pulex and earthworms. Daphnia were found to move away from increasing concentrations of H₂O2 but earthworms appeared unaffected. It is possible that earthworm swarming behavior, reported frequently before earthquakes, is caused by electric field shifts or another unknown mechanism, whereas zooplankton may be affected by increasing levels of H₂O₂.

No MeSH data available.


Related in: MedlinePlus

The mean position (based on 10 replicates of two Daphnia) (±standard deviation) of the Daphnia 10 minutes after varying concentrations of hydrogen peroxide was added to the tank. Start position at 0, −20 cm = entry point of hydrogen peroxide, 30 cm = furthest distance from entry point of hydrogen peroxide.
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animals-05-00206-f005: The mean position (based on 10 replicates of two Daphnia) (±standard deviation) of the Daphnia 10 minutes after varying concentrations of hydrogen peroxide was added to the tank. Start position at 0, −20 cm = entry point of hydrogen peroxide, 30 cm = furthest distance from entry point of hydrogen peroxide.

Mentions: The position of the Daphnia after ten minutes varied significantly with increasing concentrations of hydrogen peroxide, with the average position being further from start point with increasing concentrations of H2O2 (Kruskal-Wallis: X2 = 15.895, n1–5 = 20, P = 0.003) (Figure 5). The death rate of the Daphnia (which was less than 3% overall) was not affected by the varying concentrations of H2O2 after 10 minutes.


Behavioral Response of Invertebrates to Experimental Simulation of Pre-Seismic Chemical Changes.

Grant RA, Conlan H - Animals (Basel) (2015)

The mean position (based on 10 replicates of two Daphnia) (±standard deviation) of the Daphnia 10 minutes after varying concentrations of hydrogen peroxide was added to the tank. Start position at 0, −20 cm = entry point of hydrogen peroxide, 30 cm = furthest distance from entry point of hydrogen peroxide.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494413&req=5

animals-05-00206-f005: The mean position (based on 10 replicates of two Daphnia) (±standard deviation) of the Daphnia 10 minutes after varying concentrations of hydrogen peroxide was added to the tank. Start position at 0, −20 cm = entry point of hydrogen peroxide, 30 cm = furthest distance from entry point of hydrogen peroxide.
Mentions: The position of the Daphnia after ten minutes varied significantly with increasing concentrations of hydrogen peroxide, with the average position being further from start point with increasing concentrations of H2O2 (Kruskal-Wallis: X2 = 15.895, n1–5 = 20, P = 0.003) (Figure 5). The death rate of the Daphnia (which was less than 3% overall) was not affected by the varying concentrations of H2O2 after 10 minutes.

Bottom Line: One possible way in which animals could be affected by pre-earthquake processes is via stress activated positive holes leading to the formation of hydrogen peroxide at the rock water interface.Here, we carry out avoidance tests with hydrogen peroxide in two model organisms; Daphnia pulex and earthworms.Daphnia were found to move away from increasing concentrations of H₂O2 but earthworms appeared unaffected.

View Article: PubMed Central - PubMed

Affiliation: Department of Animal and Land Sciences, Hartpury College, Hartpury, Gloucester GL19 3BE, UK. Rachel.grant@hartpury.ac.uk.

ABSTRACT
Unusual behavior before earthquakes has been reported for millennia but no plausible mechanism has been identified. One possible way in which animals could be affected by pre-earthquake processes is via stress activated positive holes leading to the formation of hydrogen peroxide at the rock water interface. Aquatic and fossorial animals could be irritated by H₂O₂ and move down the concentration gradient. Here, we carry out avoidance tests with hydrogen peroxide in two model organisms; Daphnia pulex and earthworms. Daphnia were found to move away from increasing concentrations of H₂O2 but earthworms appeared unaffected. It is possible that earthworm swarming behavior, reported frequently before earthquakes, is caused by electric field shifts or another unknown mechanism, whereas zooplankton may be affected by increasing levels of H₂O₂.

No MeSH data available.


Related in: MedlinePlus