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1 September 2003 DOES JELLY ENVELOPE PROTECT THE COMMON FROG RANA TEMPORARIA EMBRYOS FROM UV-B RADIATION?
Katja Räsänen, Maarit Pahkala, Anssi Laurila, Juha Merilä
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Abstract

Animals have evolved a number of ways to protect themselves from the harmful effects of ultraviolet-B (UV-B) radiation, but little is known about the relative importance of different mechanisms protecting amphibian embryos from UV-B radiation. Using enzymatic removal of gelatinous coats (jelly envelope) surrounding the eggs of Rana temporaria, we tested the hypothesis that the jelly envelope acts as a sunscreen that protects embryos from harmful effects of UV-B radiation. We conducted two independent factorial laboratory experiments employing three different UV-B (no UV-B, normal, and enhanced) levels and jelly removal (control, modified, and completely removed) treatments. We found no UV-B × jelly removal treatment interactions in survival rates or in frequency of abnormal individuals, suggesting that jelly removal did not increase susceptibility of embryos to UV-B radiation. These results support the contention that the jelly envelope is not the most important means of protecting R. temporaria embryos from UV-B radiation. Other factors (e.g., melanin pigments, other sunscreen compounds, effective DNA-repair mechanisms) must be responsible for the high UV-B radiation tolerance of embryos.

Katja Räsänen, Maarit Pahkala, Anssi Laurila, and Juha Merilä "DOES JELLY ENVELOPE PROTECT THE COMMON FROG RANA TEMPORARIA EMBRYOS FROM UV-B RADIATION?," Herpetologica 59(3), 293-300, (1 September 2003). https://doi.org/10.1655/01-105
Accepted: 1 March 2003; Published: 1 September 2003
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KEYWORDS
amphibians
Envelope
Jelly
Rana temporaria
UV-B
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