ISSN:
1573-5117
Keywords:
Daphnia longispina
;
ultraviolet radiation
;
pigments
;
photoprotection
;
genetics
;
clonal diversity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract In the mountain range of South Norway, transparent and melanic members of the Daphnia longispina complex occur. Melanic populations inhabit clearwater lakes and ponds, while transparent populations are found in ponds with slightly humic water. Mixed populations have not been detected. The distribution patterns of the two morphs are related to ambient levels of short-wave radiation, and the light absorptive properties of the inhabited waters. The pigment present is probably melanin, which is deposited in the dorsally directed parts of the carapace, head shield and antennae. Allozyme studies indicate that these distinct morphs are only remotely related, the alpine transparent group being closer to lowland, likewise transparent, populations. A melanic population found at Svalbard is closely related to the melanic mainland populations. Clonal diversity in ponds and shallow lakes is very low, in contrast to populations of deeper lakes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00028401
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