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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

Showing the setup for the Daphnia avoidance test.
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animals-05-00206-f004: Showing the setup for the Daphnia avoidance test.

Mentions: Opaque glass tanks (11 × 48 cm) were filled with four liters of degassed tap water (Figure 3 and Figure 4). A location grid of 5 cm squares was placed under each tank. The entry point was marked as zero with filling point at −20 cm. A standard filling procedure was developed to ensure that the hydrogen peroxide added would diffuse long the length of the tank in 10 minutes, allowing a concentration gradient to be established but without creating significant water movement. Concentrations of hydrogen peroxide in 200 mL were prepared to give a final concentration of zero (control), 0.0024 M, 0.024 M, 0.24 M, and 2.4 M in four liters.


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

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

Showing the setup for the Daphnia avoidance test.
© Copyright Policy
Related In: Results  -  Collection

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

animals-05-00206-f004: Showing the setup for the Daphnia avoidance test.
Mentions: Opaque glass tanks (11 × 48 cm) were filled with four liters of degassed tap water (Figure 3 and Figure 4). A location grid of 5 cm squares was placed under each tank. The entry point was marked as zero with filling point at −20 cm. A standard filling procedure was developed to ensure that the hydrogen peroxide added would diffuse long the length of the tank in 10 minutes, allowing a concentration gradient to be established but without creating significant water movement. Concentrations of hydrogen peroxide in 200 mL were prepared to give a final concentration of zero (control), 0.0024 M, 0.024 M, 0.24 M, and 2.4 M in four liters.

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