Fine-scale acoustic telemetry reveals unexpected lake trout, Salvelinus namaycush , spawning habitats in northern Lake Huron, North America
| Autor: | Christopher M. Holbrook, Stephen C. Riley, Henry T. Thompson, Ji X. He, Steven A. Farha, Roger A. Bergstedt, Charles C. Krueger, Thomas R. Binder, Charles R. Bronte |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category Ecology biology 010604 marine biology & hydrobiology Rubble Aquatic Science engineering.material biology.organism_classification 010603 evolutionary biology 01 natural sciences Bathymetric chart Deposition (geology) Fishery Current (stream) Trout Habitat engineering Reef Ecology Evolution Behavior and Systematics Geology Salvelinus |
| Zdroj: | Ecology of Freshwater Fish. 27:594-605 |
| ISSN: | 0906-6691 |
| Popis: | Previous studies of lake trout, Salvelinus namaycush, spawning habitat in the Laurentian Great Lakes have used time- and labour-intensive survey methods and have focused on areas with historic observations of spawning aggregations and on habitats prejudged by researchers to be suitable for spawning. As an alternative, we used fine-scale acoustic telemetry to locate, describe and compare lake trout spawning habitats. Adult lake trout were implanted with acoustic transmitters and tracked during five consecutive spawning seasons in a 19–27 km2 region of the Drummond Island Refuge, Lake Huron, using the VEMCO Positioning System. Acoustic telemetry revealed discrete areas of aggregation on at least five reefs in the study area, subsequently confirmed by divers to contain deposited eggs. Notably, several identified spawning sites would likely not have been discovered using traditional methods because either they were too small and obscure to stand out on a bathymetric map or because they did not conform to the conceptual model of spawning habitat held by many biologists. Our most unique observation was egg deposition in gravel and rubble substrates located at the base of and beneath overhanging edges of large boulders. Spawning sites typically comprised |
| Databáze: | OpenAIRE |
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