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Delayed effect of geomagnetic storm simulation on size, mass and activity of digestive glycosidases in roach ( Rutilus rutilus Linnaeus, 1758) underyearlings
Author(s) -
Golovanova I. L.,
Filippov A. A.,
Chebotareva Yu. V.,
Izyumov Yu. G.,
Krylov V. V.
Publication year - 2017
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.13290
Subject(s) - rutilus , biology , human fertilization , zoology , embryo , andrology , offspring , juvenile , sperm , anatomy , endocrinology , ecology , fish <actinopterygii> , fishery , botany , pregnancy , medicine , genetics
Summary This study aim was finding delayed consequences of the main phase impact and initial recovery period phase of a typical geomagnetic storm ( MRGMS ) experimentally reproduced in the range of 0–0.001 Hz on roach ( Rutilus rutilus L., 1758) embryos. Roe and sperm were collected from four females and eight males caught in the Rybinsk reservoir, to achieve phenetic diversity in the resulting offspring. Mean water temperature during fertilization and embryo incubation was 18.02°C. The embryos were exposed before (1–6 hr post‐fertilization) and after (33–39 hr post‐fertilization) gastrulation to MRGMS with intensities of 100, 300 and 500 nT , which corresponded to the main phase and initial recovery period phase of typical moderate, strong and severe geomagnetic storms. After this exposure, body mass, standard length, mass and length of the intestine, plus activity, temperature and kinetic characteristics of digestive glycosidases were evaluated in four‐month‐old underyearlings (standard length 5.57–8.66 cm, body mass 3.08–12.01 g) developed from exposed embryos. Standard length and mass were lower in fish exposed to different MRGMS following gastrulation. In general, when compared to the controls, the activity of maltase was lower and activity of sucrase higher in fish exposed to different MRGMS before and after gastrulation. Maximal differences between experimental and control groups were caused by an impact of the simulation that corresponded to a moderate geomagnetic storm. After the influence of studied simulations was introduced, adaptive changes in digestive glycosidases were revealed, including an increase of enzymes affinity for the substrate, an enlargement of maltase temperature optimum and a decrease of maltase E act in the range of environmental temperatures. The magnitude and direction of observed effects depended on the MRGM intensity and the time intervals in embryogenesis when the exposures were carried out.