Pavlov D.A., Osinov A.G. 2008. Reproduction and development in the dwarf form of Arctic Charr Salvelinus alpinus from Lake Davatchan, Transbaikalia (original) (raw)
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Canadian Journal of Fisheries and Aquatic Sciences, 1982
In this paper, we investigate the reproductive strategy maintaining dwarf and normal phenotypes of an Arctic charr (Salvelinus alpinus) population. Both morphs occurred together in the spawning area, but the peak abundance of dwarf spawners was significantly deeper, and later in the spawning period, than normal spawners. Both phenotypes attained sexual maturity at the same age and did not differ in length-specific fecundity or egg diameter. Our data support the hypothesis that the females matured sexually at the age that maximizes their fitness within the constraints imposed by growth and survival. The two female morphs appeared not to have equal fitness; these differences may be due to random events. The males were more heterogeneous by size than the females when maturing sexually. This may be due to intrasexual competition between males making large males the principal spawners. The dwarf males may circumvent the effects of intrasexual competition by mimicking immature fish, sneak...
Environmental Biology of Fishes, 2002
Previous studies have found no consistent relationship between egg size and the rate of development in fish. This is surprising since there are several hypothesis as to why such a relationship should exist. By using eggs from Arctic charr, Salvelinus alpinus, we examined several developmental features repeatedly on live individuals. In all measured parameters except date of hatching, embryos from smaller eggs were found to develop faster. Time of hatching has often been used as a principal measurement for rate of development in fish, but our results suggest that this should be discontinued, since it is poorly correlated with the rates of development of other early life history features.
Biological Journal of The Linnean Society, 1989
Four coexisting morphs or arctic charr, Salvelinus alpinus (L.), occur in the lake Thingvallavatn, Iceland. They can be identified by their head morphology, which appears to he related to feeding habits, benthivorous or planktivorous-piscivorous. Laboratory-rearing experiments indicate that these morphological differences have a genetic basis with a significant maternal effect and support the suggestion that there are three populations of arctic charr in the lake. The ontogenetic mechanism of these differences most readily explained as development heterochrony, that is the heterochrony that shape reflects embryonic phenotypic characteristics while the planktivorous-piscivorous head shape is more differentiated from the embroyonic phenotype.
Journal of Fish Biology, 2006
The relationships among time of spawning, incubation temperature, timing of first feeding and early growth were examined in four sympatric morphs of Arctic charr in Thingvallavatn, Iceland. Large benthivorous charr spawn in July-August at sites with cold ground-water flow. Planktivorous and piscivorous charr spawn in September-November and are not confined to ground-water sites. The spawning of small benthivorous charr overlaps with that of other morphs. Progeny of large benthivorous charr start feeding 2-3 months earlier than the progeny of autumn spawners. This results in differential size distribution and growth rates of young in the spring.