Restored river habitat provides a natural spawning area for a critically endangered landlocked Atlantic salmon population
| Autor: | Jorma Piironen, Antti Kause, Jarmo Koskiniemi, Tuomas Leinonen, Marja-Liisa Koljonen |
|---|---|
| Přispěvatelé: | Organismal and Evolutionary Biology Research Programme, Department of Agricultural Sciences |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Conservation genetics Male Sexual Reproduction Heredity FITNESS Conservation Biology Endangered species Marine and Aquatic Sciences Broodstock 01 natural sciences Critically endangered Salmon Inbreeding Salmo Finland Phylogeny Conservation Science education.field_of_study Multidisciplinary biology Geography Reproduction Eukaryota WILD Pedigree Freshwater Fish Osteichthyes 1181 Ecology evolutionary biology Vertebrates Freshwater fish Conservation Genetics GENETIC DIVERSITY Medicine Female Research Article Freshwater Environments INDIVIDUAL REPRODUCTIVE SUCCESS Spawning Science Population CONSERVATION Salmo salar Modes of Reproduction 010603 evolutionary biology Rivers MANAGEMENT Genetics SALAR Animals 14. Life underwater education RECOLONIZATION Ecosystem RESTORATION Population Density Evolutionary Biology Population Biology 010604 marine biology & hydrobiology MATING SYSTEM Endangered Species Ecology and Environmental Sciences Organisms Genetic Variation Aquatic Environments Biology and Life Sciences Bodies of Water biology.organism_classification Hatchery Fishery Lakes Fish Earth Sciences Population Genetics Developmental Biology |
| Zdroj: | PLoS ONE PLoS ONE, Vol 15, Iss 5, p e0232723 (2020) |
| ISSN: | 1932-6203 |
| Popis: | Supplementing endangered fish populations with captive bred individuals is a common practice in conservation management. The aim of supplementary releases from hatchery broodstocks is to maintain the viability of populations by maintaining their genetic diversity. Landlocked Lake Saimaa salmon (Salmo salar m. sebago) has been critically endangered for the past half-century. As a result of anthropogenic disturbance, especially construction of hydroelectric power plants, the Lake Saimaa salmon has become completely dependent on hatchery broodstock. Recently, habitat restoration has been done in one of the former spawning rivers with the aim of creating a new natural spawning ground for the critically endangered population. Hatchery fish releases have also been revised so that in addition to juveniles, adult fish from the hatchery and from the wild have been released into the restored river. We assessed here if a restored river stretch can be used as a natural spawning ground and juvenile production area with the aim of improving genetic diversity of the critically endangered Lake Saimaa salmon. By constructing a pedigree of the released adults, and juveniles sampled from the restored river, we found that the majority of the released adults had produced offspring in the river. We also found that wild-caught spawners that were released into the restored river had much higher reproductive success than hatchery-reared parents that were released into the restored river at the same time. We found no significant differences in genetic diversity between the parent and offspring generations. Meanwhile, relatedness among different groups of adults and juveniles varied a lot. For example, while the hatchery-reared females were on average half-siblings, wild-caught females showed no significant relatedness. This highlights the importance of using pedigree information in planning the conservation and management of endangered populations, especially when artificial propagation is involved. |
| Databáze: | OpenAIRE |
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