Evidence of successful river spawning by lake trout (Salvelinus namaycush) in the Lower Niagara River, Lake Ontario
Autor: | Eric Bruestle, Zy Biesinger, Alexander J. Gatch, Dimitry Gorsky, Meredith L. Bartron, Kelley Lee, Curt Karboski, Tyler Wagner |
---|---|
Rok vydání: | 2021 |
Předmět: |
0106 biological sciences
animal structures Spawning habitat animal diseases Population Adult population 010501 environmental sciences Aquatic Science 01 natural sciences parasitic diseases education Short duration Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Salvelinus education.field_of_study Ecology biology urogenital system 010604 marine biology & hydrobiology fungi Juvenile fish biology.organism_classification Portfolio effect Fishery Trout Geography |
Zdroj: | Journal of Great Lakes Research. 47:486-493 |
ISSN: | 0380-1330 |
Popis: | Restoration of a wild-produced lake trout Salvelinus namaycush population in Lake Ontario has not been successful despite the adult population often meeting or exceeding restoration targets. Lack of high-quality spawning habitat in Lake Ontario is suggested as one impediment to recruitment of wild lake trout, although the quantity and location of spawning habitat is poorly understood. If high-quality spawning habitat is limited in Lake Ontario, lake trout may be using uncommon spawning locations such as rivers. Anecdotal angler accounts point to the Niagara River as a lake trout spawning location. To better understand the potential of the Niagara River as a spawning location, egg and juvenile fish collections were conducted 12–14 river kilometers from the mouth of the Niagara River from 2010 to 2012; and mature female lake trout with surgically implanted acoustic tags were monitored from 2015 to 2019. Genetic analyses confirmed 60% of collected eggs and 93% of collected post-hatch juvenile fish in the Niagara River were lake trout. Tagged female lake trout returned to the Niagara River over consecutive years during the spawning season. The short duration of lake trout presence in the river (mean = 56 days/year) suggests female lake trout use the Niagara River primarily for spawning. Diversity in spawning locations may provide lake trout population’s resilience against environmental variability through a portfolio effect. Improved identification of riverine spawning locations, including their overall contribution to wild recruitment, may be a useful tool for managers to restore a wild-produced population of lake trout in Lake Ontario. |
Databáze: | OpenAIRE |
Externí odkaz: |