Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic

Journal of Fish Biology - Tập 38 Số 1 - Trang 123-147 - 1991
Henry H. Parker1, Lionel Johnson2
1Markhuset, Gambles Lane, Woodmancote, Cheltenham, Glones GL52 4PV, U.K.
2Department of Fisheries and Oceans, Freshwater Institute, 501 University Crescent, Winnipeg,#R#MB, R3T 2N6, Canada

Tóm tắt

Land‐locked populations of Arctic charr in four lakes on Northern Ellesmere Island (80° N) were found to consist of two distinct sizes: ‘dwarf’ and ‘normal’ charr. Both groups attained sexual maturity but differed in appearance and habitat. The smaller fish, occupying the more marginal habitats, retained their parr‐markings; the larger group had the general characteristics of smolts, being more silvery and without parr‐marks. In their juvenile stages, the charr destined to attain the larger group were indistinguishable from members of the smaller group. Although fish in the larger group were capable of cannibalism, this was rarely observed. In general, the fish in the larger group were older than the smaller ones but great variation in size at a given age resulted in certain age classes containing representatives of both groups. The population structure varied considerably between lakes; a high proportion of ‘normal’ charr correlated well with a high growth rate in the first few years of development. It is postulated that the two groups live in dynamic equilibrium where the advantages of progenesis (retention of juvenile characters by adults) in the smaller type are traded against the larger proportion of the energy resources available to the larger type. The concept of heterochrony in an ecological setting is introduced.

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Tài liệu tham khảo

Barsh D., 1981, Results of the Heidelberg‐Ellesmere Island Expedition

Barsch D., 1981, Results of the Heidelberg‐Ellesmere Island Expedition

10.1139/f79-175

10.1098/rstb.1978.0011

10.1139/f77-178

Beer G. R., 1958, Embryos and Ancestors

Elton C. S., 1924, Periodic fluctation in the number of animals: their causes and effects, British Journal of Experimental Biology, 2, 119, 10.1242/jeb.2.1.119

Elton C. S., 1927, Animal Ecology

Feynman R. P., 1963, The Feynman Lectures in Physics, 19‐1

10.1111/j.1439-0426.1989.tb00484.x

10.1111/j.1469-7998.1968.tb01668.x

Gould S. J., 1977, Ontogeny and Phylogeny

10.1098/rstb.1971.0018

Hammar J., 1984, Biology of the Arctic Charr, 35

10.1139/f80-033

Henricson J., 1976, The ecological and genetical segregation of two sympatric species of dwarfed char (Salvelinus alpinus (L.) Species complex), Report of the Institute of Freshwater Research Drottningholm, 55, 15

Hile R., 1936, Age and growth of the ciscoe, Leucichthys artedi (Le Sueur), in the lakes of the northeastern highlands, Wisconsin, Bulletin of the United States Bureau of Fisheries, 48, 211

10.1111/j.1095-8312.1986.tb01737.x

Hynes H. N. B., 1950, The Ecology of Running Waters

10.1139/f72-118

10.1139/f76-293

Johnson L., 1980, Charrs: Salmonid Fishes of the Genus Salvelinus, 15

10.1139/f83-125

10.1139/f83-125

Johnson L., 1988, Entropy, Information and Evolution, 75

10.1007/978-3-540-39463-1_1

Johnson L., Complex Ecology

10.1139/f82-189

Kesteven G. L., 1960, Manual of Field Methods in Fisheries Biology

Klemetsen A., 1984, Biology of the Arctic Charr, 65

Klemetsen A., 1980, Charrs: Salmonid Fishes of the Genus Salvelinus, 757

10.2307/1540

10.1139/f63-050

10.2307/1929601

MacArthur R. H., 1967, The Theory of Island Biogeography

MacCallum W. R., 1984, The Biology of the Arctic Charr, 329

McCart P. J., 1970, Biology of Coregonid Fishes, 81

10.1139/z84-201

10.1126/science.146.3642.347

Nordeng H., 1961, On the biology of char, Salmo alpinus L., in Salangen, North Norway. I. Age and spawning frequency determined from scales and otoliths, Nytt Magasin fur Zoologi, 10, 67

10.1139/f83-159

10.1139/f88-044

Nyman L., 1984, Biology of the Arctic Charr, 23

Pechlaner R., 1984, Biology of the Arctic Charr, 319

10.1139/f78-008

10.1126/science.201.4358.777

Ricker W. E.(1975).Computation and Interpretation of Biological Statistics of Fish Populations.Fisheries and Marine Service Bulletin 191. Ottawa: Department of Environment.

10.1139/f86-121

10.2307/3817

10.2307/3565974

10.1111/j.1095-8649.1985.tb04270.x

Svardson G., 1961, Vertebrate Speciation

10.2307/1930070

Vanriel P.(1989).Energy relationships between trophic levels and associated taxa in a small autonomous arctic lacustrine ecosystem.M.Sc. thesis Department of Zoology University of Manitoba.

Whittaker R. H., 1970, Communities and Ecosytems

10.1007/978-94-011-7918-8_9

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Journal of Fish Biology

Tập 38 Số 1

123-147

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