The response of European Daphnia magna Straus and Australian Daphnia carinata King to changes in geomagnetic field. (March 2013)

• Record Type: Journal Article
• Authors: Krylov, Viacheslav V.; Bolotovskaya, Irina V.; Osipova, Elena A.
• Is Part Of: Electromagnetic biology and medicine. Volume 32:Number 1(2013:Jan.)
• Page Start: 30
• Page End: 39
• Publication Date: 2013-03
• Subjects: Electrophysiology -- Periodicals; Electromagnetic Fields -- Periodicals; Electrophysiology -- Periodicals; Radiation, Nonionizing -- Periodicals; 574
• DOI: 10.3109/15368378.2012.700291
• Languages: English
• ISSNs: 1536-8378

Abstract

<abstract> <title> <x xml:space="preserve">Abstract</x> </title> <p>This study investigates the effects of lifelong exposure to reversed geomagnetic and zero geomagnetic fields (the latter means absence of geomagnetic field) on the life history of <italic>Daphnia carinata</italic> King from Australia and <italic>Daphnia magna</italic> Straus from Europe. Considerable deviation in the geomagnetic field from the usual strength, leads to a decrease in daphnia size and life span. Reduced brood sizes and increased body length of neonates are observed in <italic>D. magna</italic> exposed to unusual magnetic background. The most apparent effects are induced by zero geomagnetic field in both species of <italic>Daphnia</italic>. A delay in the first reproduction in zero geomagnetic field is observed only in <italic>D. magna</italic>. No adaptive maternal effects to reversed geomagnetic field are found in a line of <italic>D. magna</italic> maintained in these magnetic conditions for eight generations. Integrally, the responses of <italic>D. magna</italic> to unusual geomagnetic conditions are more extensive than that in <italic>D. carinata</italic>. We suggest that the mechanism of the effects of geomagnetic field reversal on Daphnia may be related to differences in the pattern of distribution of the particles that have a magnetic moment, or to moving charged organic molecules owing to a change in combined outcome and orientation of the geomagnetic field and Earth's gravitational field. The possibility of modulation of self-oscillating processes with changes in geomagnetic field is also discussed.</p> </abstract>