Diet shift of double-crested cormorants in eastern Lake Ontario associated with the expansion of the invasive round goby

2010 ◽  
Vol 36 (2) ◽  
pp. 242-247 ◽  
Author(s):  
James H. Johnson ◽  
Robert M. Ross ◽  
Russell D. McCullough ◽  
Alastair Mathers
Keyword(s):  
Round Goby ◽  
Lake Ontario ◽  
Diet Shift

scholarly journals Feeding ecology and niche overlap of Lake Ontario offshore forage fish assessed with stable isotopes

2018 ◽  
Vol 75 (5) ◽  
pp. 759-771 ◽  
Author(s):  
James A. Mumby ◽  
Timothy B. Johnson ◽  
Thomas J. Stewart ◽  
Edmund A. Halfyard ◽  
Brian C. Weidel ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Fish Species ◽  
Round Goby ◽  
Lake Ontario ◽  
Niche Overlap ◽  
Neogobius Melanostomus ◽  
Forage Fish ◽  
Isotopic Niche ◽  
Ecosystem Structure ◽  
Rainbow Smelt

The forage fish communities of the Laurentian Great Lakes continue to experience changes that have altered ecosystem structure, yet little is known about how they partition resources. Seasonal, spatial, and body size variation in δ13C and δ15N was used to assess isotopic niche overlap and resource and habitat partitioning among the five common offshore Lake Ontario forage fish species (n = 2037; alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), round goby (Neogobius melanostomus), and deepwater (Myoxocephalus thompsonii) and slimy (Cottus cognatus) sculpins). Round goby had the largest isotopic niche (6.1‰2, standard ellipse area), followed by alewife (3.4‰2), while rainbow smelt, slimy sculpin, and deepwater sculpin had the smallest and similar niche size (1.7‰2–1.8‰2), with only the sculpin species showing significant isotopic niche overlap (>63%). Stable isotopes in alewife, round goby, and rainbow smelt varied with location, season, and size, but did not vary in the sculpin species. Lake Ontario forage fish species have partitioned food and habitat resources, and non-native alewife and round goby have the largest isotopic niche, suggestive of a boarder ecological niche, and may contribute to their current high abundance.

Occurrence and Food Habits of the Round Goby in the Profundal Zone of Southwestern Lake Ontario

2007 ◽  
Vol 33 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Maureen G. Walsh ◽  
Dawn E. Dittman ◽  
Robert O'Gorman
Keyword(s):  
Food Habits ◽  
Round Goby ◽  
Lake Ontario ◽  
Profundal Zone

Diel Diet Composition and Feeding Activity of Round Goby in the Nearshore Region of Lake Ontario

2008 ◽  
Vol 23 (4) ◽  
pp. 607-612 ◽  
Author(s):  
James H. Johnson ◽  
James E. McKenna ◽  
Christopher C. Nack ◽  
Marc A. Chalupnicki
Keyword(s):  
Diet Composition ◽  
Feeding Activity ◽  
Round Goby ◽  
Lake Ontario

Thiamine status of lake trout in lake Ontario and its relation to diet after the colonization of round goby, 2005–2006

2021 ◽  
Author(s):  
John D. Fitzsimons ◽  
Brian Lantry ◽  
Dale C. Honeyfield ◽  
Robert O'Gorman ◽  
Scott A. Rush ◽  
...  
Keyword(s):  
Lake Trout ◽  
Round Goby ◽  
Lake Ontario

scholarly journals Habitat utilization and feeding ecology of small round goby in a shallow brackish lagoon

2020 ◽  
Vol 50 (5) ◽  
Author(s):  
Christina Henseler ◽  
Paul Kotterba ◽  
Erik Bonsdorff ◽  
Marie C. Nordström ◽  
Daniel Oesterwind
Keyword(s):  
Feeding Ecology ◽  
Prey Availability ◽  
Feeding Strategy ◽  
Round Goby ◽  
Structural Complexity ◽  
Neogobius Melanostomus ◽  
Small Scale ◽  
Diet Shift ◽  
Vegetation Density ◽  
Round Gobies

Abstract We examined small-scale distribution and feeding ecology of a non-native fish species, round goby (Neogobius melanostomus (Pallas, 1814)), in different habitats of a coastal lagoon situated in the south-western Baltic Sea. First observations of round goby in this lagoon were reported in 2011, 3 years before the current study was conducted, and information on this species’ basic ecology in different habitats is limited. We found that mainly juvenile round gobies are non-randomly distributed between habitats and that abundances potentially correlate positively with vegetation density and thus structural complexity of the environment. Abundances were highest in shallower, more densely vegetated habitats indicating that these areas might act as a refuge for small round gobies by possibly offering decreased predation risk and better feeding resources. Round goby diet composition was distinct for several length classes suggesting an ontogenetic diet shift concerning crustacean prey taxa between small (≤ 50 mm total length, feeding mainly on zooplankton) and medium individuals (51–100 mm, feeding mainly on benthic crustaceans) and another diet shift of increasing molluscivory with increasing body size across all length classes. Differences in round goby diet between habitats within the smallest length class might potentially be related to prey availability in the environment, which would point to an opportunistic feeding strategy. Here, we offer new insights into the basic ecology of round goby in littoral habitats, providing a better understanding of the ecological role of this invasive species in its non-native range, which might help to assess potential consequences for native fauna and ecosystems.

Alternative Ecological Pathways in the Eastern Lake Ontario Food Web—Round Goby in the Diet of Lake Trout

2006 ◽  
Vol 32 (2) ◽  
pp. 395-400 ◽  
Author(s):  
Jason P. Dietrich ◽  
Bruce J. Morrison ◽  
James A. Hoyle
Keyword(s):  
Food Web ◽  
Lake Trout ◽  
Round Goby ◽  
Lake Ontario
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