Ecological Forms of Black Sea Brown Trout (Salmo trutta labrax) in the Mzymta River as Manifestation of Ontogenetic Plasticity
| Autor: | S. I. Reshetnikov, I. G. Murza, M. V. Ponomareva, A. N. Pashkov, Alexander A. Makhrov, V. S. Artamonova, O. L. Christoforov |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
endocrine system education.field_of_study Fish migration geography animal structures geography.geographical_feature_category Ecology animal diseases 010604 marine biology & hydrobiology Ontogeny Population Biodiversity Biology 010603 evolutionary biology 01 natural sciences Brown trout Tributary Sexual maturity Black sea education Developmental Biology |
| Zdroj: | Russian Journal of Developmental Biology. 49:117-127 |
| ISSN: | 1608-3326 1062-3604 |
| Popis: | Populations of brown trout in the Mzymta River and its tributaries include anadromous (mainly female) and resident (mainly males) fish. Some resident males in the basin of the Mzymty River attain sexual maturity at the age 1+, and resident females mature at the age 2+ or 3+. The maximum age of resident fish is 4+ in the samples studied. Migrations of anadromous brown trout to the sea occur at the ages 1+, 2+, or 3+. Future spawners spend from 1 to 4 years at feeding grounds in the sea. Smolts of the population are characterized by performing not only spring but also autumn migrations to the sea. One smolt specimen has been detected upstream from the dam in the river where spawners of anadromous brown trout do not migrate; this means that the capability for sea migrations persists long in the population represented only by resident specimens of brown trout. The diversity of life cycles and ecological forms in populations of brown trout is not lower than in populations of brown trout in Northern and Western Europe. The comparison of the data obtained with published data makes it possible to come to the conclusion about the high plasticity of ontogenesis of Black Sea brown trout. |
| Databáze: | OpenAIRE |
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