Examination of the influence of juvenile Atlantic salmon on the feeding mode of juvenile steelhead in Lake Ontario tributaries

Johnson, James H.; Waldt, Emily M.

doi:10.1016/j.jglr.2014.03.005

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…Also consistent with our observations, Coghlan, Connerton et al. () and Johnson () reported that subyearling Atlantic salmon fed more from the benthos than from the drift and Atlantic salmon were more benthic oriented than other co‐occurring salmonid species (Johnson & Waldt, ; Mookerji, Weng, & Mazumder, ). The consumption of terrestrial invertebrates is generally considered a strong indication of drift feeding (Allan, Wipfli, Carouette, Prussian, & Rodgers, ; Nakano, Fausch, & Kitano, ) and in Beaverdam Brook terrestrial invertebrates comprised 16% of the diet of subyearling Chinook salmon and only 1% of the diet of subyearling Atlantic salmon.…”

Section: Discussionsupporting

confidence: 92%

“…Johnson () observed that subyearling rainbow trout will shift to areas with slower water velocities in the presence of Atlantic salmon. Studies examining interspecific feeding associations between juvenile Atlantic salmon and juvenile rainbow trout in the Lake Ontario basin have shown a high degree of diet similarity (Coghlan, Cain, & Ringler, ) and that in the presence of Atlantic salmon, subyearling rainbow trout shift to a more drift feeding pattern (Johnson & Waldt, ).…”

Section: Introductionmentioning

confidence: 99%

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Diet, feeding patterns, and prey selection of subyearling Atlantic salmon (Salmo salar) and subyearling chinook salmon (Oncorhynchus tshawytscha) in a tributary of Lake Ontario

et al. 2017

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Summary Since juvenile Atlantic salmon (Salmo salar) and Chinook salmon (Oncorhynchus tshawytscha) occupy a similar habitat in Lake Ontario tributaries, we sought to determine the degree of diet similarity between these species in order to assess the potential for interspecific competition. Atlantic salmon, an historically important but currently extirpated component of the Lake Ontario fish community, are the focus of a bi‐national restoration effort. Presently this effort includes the release of hatchery produced juvenile Atlantic salmon in Lake Ontario tributaries. These same tributaries support substantial numbers of naturally reproduced juvenile Pacific salmonids including Chinook salmon. Subyearling Atlantic salmon and subyearling Chinook salmon had significantly different diets during each of the three time periods examined. Atlantic salmon fed slightly more from the benthos than from the drift and consumed mainly chirononmids (47.0%) and ephemeropterans (21.1%). The diet of subyearling Chinook salmon was more closely associated with the drift and consisted mainly of chironomids (60.2%) and terrestrial invertebrates (16.0%). Low diet similarity between subyearling Atlantic salmon and subyearling Chinook salmon likely minimizes competitive interactions for food between these species in Lake Ontario tributaries. However, the availability of small prey such as chironomids which comprise over 50% of the diet of each species, soon after emergence, could constitute a short term resource limitation. To our knowledge this is the first study of interspecific diet associations between these two important salmonid species.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Diet, feeding patterns, and prey selection of subyearling Atlantic salmon (Salmo salar) and subyearling chinook salmon (Oncorhynchus tshawytscha) in a tributary of Lake Ontario

et al. 2017

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“…The closer association of the diet of Atlantic salmon with the composition of the benthos is consistent with summer observations for salmon in Grout Brook (Johnson & McKenna, ). Rainbow trout parr have been shown to feed equally from the drift and benthos (Johnson, ; Johnson, McKenna, & Douglass, ) but switch to a more drift feeding strategy in the presence of Atlantic salmon (Johnson & Waldt, ). Previous studies have also found that Atlantic salmon feed from the benthos (Sosiak, Randall, & McKenzie, ; Williams, ; Johansen et al., ; Johnson, ) and drift (Kalleberg, ; Wańkowski, ; Wańkowski & Thorpe, ).…”

Section: Discussionmentioning

confidence: 99%

“…Interspecific species interactions have been shown to influence diet composition. Brook trout (Salvelinus fontinalis) (Mookerji, Weng, & Mazumder, 2004), brown trout (Dineen, Harrison, & Giller, 2007), and rainbow trout (Johnson & Waldt, 2014) have been shown to feed more heavily on drifting terrestrial insects in sympatry with juvenile Atlantic salmon. The mechanism for diet differences in sympatric salmonid species may be related to microhabitat use which often is influenced by interspecific interactions (Johnson, 2016;Young, 2004).…”

Section: Discussionmentioning

confidence: 99%

Comparative diets and foraging strategies of subyearling Atlantic salmon, brown trout, and rainbow trout during winter

et al. 2017

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Summary Over‐winter survival of salmonids in streams is thought to be an important population regulation mechanism. Yet because of the difficulty of conducting field studies due to adverse weather or ice conditions, compared to other seasons, salmonid ecology during winter is least understood. Consequently, we sought to examine interspecific feeding associations of an important salmonid stream assemblage in the Lake Ontario watershed during winter. The diets of Atlantic salmon (Salmo salar) parr, brown trout (S. trutta) parr, and rainbow trout (Oncorhynchus mykiss) parr were significantly different in February but not in March. Salmonid diets differed from the benthos and the drift during both months. Dipterans (chironomids, simuliids, and tipulids) and ephemerellids were the major prey taxa consumed. All three species fed more heavily on prey items from the benthos than from the drift. The diet of Atlantic salmon had the highest similarity to the benthos whereas the diet of brown trout had the lowest similarity to the drift. All three salmonid species generally selected ephemerellids, limnephilids, and chironomids and avoided elmids. These winter feeding observations are the first reported for this specific salmonid assemblage and will help managers better understand interspecific associations during this critical period.

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Feeding periodicity, diet composition, and food consumption of subyearling rainbow trout in winter

2016

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Examination of the influence of juvenile Atlantic salmon on the feeding mode of juvenile steelhead in Lake Ontario tributaries

Cited by 6 publications

References 28 publications

Diet, feeding patterns, and prey selection of subyearling Atlantic salmon (Salmo salar) and subyearling chinook salmon (Oncorhynchus tshawytscha) in a tributary of Lake Ontario

Diet, feeding patterns, and prey selection of subyearling Atlantic salmon (Salmo salar) and subyearling chinook salmon (Oncorhynchus tshawytscha) in a tributary of Lake Ontario

Comparative diets and foraging strategies of subyearling Atlantic salmon, brown trout, and rainbow trout during winter

Feeding periodicity, diet composition, and food consumption of subyearling rainbow trout in winter

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