From yellow perch to round goby: A review of double-crested cormorant diet and fish consumption at Three St. Lawrence River Colonies, 1999–2013

Johnson, James H.; Farquhar, James; Klindt, Rodger M.; Mazzocchi, Irene M.; Mathers, Alastair

doi:10.1016/j.jglr.2014.12.011

Cited by 14 publications

(19 citation statements)

References 35 publications

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“…The dominance of round goby in the diet of cormorants at LGI beginning in 2005 resulted in a significant decline in dietary contribution of each prey species that made up over 1% of the diet during the pre-round goby period. Similar dramatic declines in the consumption of previously important prey fish species following the inclusion of round goby in the diet has also been documented at other cormorant colonies (Johnson et al, 2010(Johnson et al, , 2015. Although round goby appeared later (2004) in the diet of cormorants at LGI than at Pigeon Island (2002) andSnake Island (2003) in Lake Ontario (Johnson et al, 2010), the one year transition period was the same at each colony.…”

Section: Discussionsupporting

confidence: 64%

“…This reversed effect of round goby on the number of fish consumed seasonally by cormorants was also observed at two other Lake Ontario colonies (Johnson et al, 2010). However, a reversed seasonal pattern was not evident at three St. Lawrence River cormorant colonies after round goby became abundant in the diet (Johnson et al, 2015). Including this study, there has been a significant increase in the number of fish consumed at each of the eight cormorant colonies where diets have been examined once round goby became the dominant prey (Johnson et al, 2010(Johnson et al, , 2015Van Guilder and Seefelt, 2013).…”

Section: Discussionmentioning

confidence: 54%

“…Although round goby appeared later (2004) in the diet of cormorants at LGI than at Pigeon Island (2002) andSnake Island (2003) in Lake Ontario (Johnson et al, 2010), the one year transition period was the same at each colony. The one year transition period at the three Lake Ontario colonies contrasts with the 2-5 year transition period observed at three St. Lawrence River colonies (Johnson et al, 2015). Differences in the duration of the transition period among colonies are likely due to differences in round goby population densities in the vicinity of each cormorant colony.…”

Section: Discussionmentioning

confidence: 69%

“…However, a reversed seasonal pattern was not evident at three St. Lawrence River cormorant colonies after round goby became abundant in the diet (Johnson et al, 2015). Including this study, there has been a significant increase in the number of fish consumed at each of the eight cormorant colonies where diets have been examined once round goby became the dominant prey (Johnson et al, 2010(Johnson et al, , 2015Van Guilder and Seefelt, 2013). Johnson et al (2010) suggested that an increase in the number of fish consumed by cormorants following a dietary switch to round goby could be attributed to goby being of smaller size and lower caloric value than the prey species they replaced in the diet.…”

Section: Discussionmentioning

confidence: 86%

“…Reasons for the reversal in the seasonal trend in the number of fish consumed pre-versus post round goby at LGI and two Lake Ontario colonies (Johnson et al, 2010) are less clear, especially considering that this reversal did not occur at three St. Lawrence River colonies (Johnson et al, 2015). Johnson et al (2010) speculated that round goby being consumed may be smaller during the post-chick feeding period compared to earlier in the season at Pigeon Island and Snake Island, Lake Ontario.…”

Section: Discussionmentioning

confidence: 99%

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Little Galloo Island, Lake Ontario: Two decades of studies on the diet, fish consumption, and management of double-crested cormorants

Johnson

McCullough

Farquhar

et al. 2015

Journal of Great Lakes Research

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Little Galloo Island, Lake Ontario: Two decades of studies on the diet, fish consumption, and management of double-crested cormorants

Johnson

McCullough

Farquhar

et al. 2015

Journal of Great Lakes Research

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Effects of elevated temperature and microplastic exposure on growth and predatory performance of a freshwater fish

D'Avignon

Wang

Reid

et al. 2023

Limnology & Oceanography

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Freshwater ecosystems are increasingly exposed to co‐occurring anthropogenic stressors that can alter food web interactions and organismal life histories. We examined the individual and combined effects of climate warming and microplastic pollution on the growth rate and predatory performance of an invasive freshwater fish, the round goby (Neogobius melanostomus). In temperature‐controlled chambers, we exposed 160 juvenile gobies to one of six scenarios over 37 d, combining three environmentally relevant concentrations of microplastics (63–75 μm polyethylene microbeads) with two temperature regimes representing contemporary (18°C) and projected mean summer maxima (26°C) in their current range in the Great Lakes–St. Lawrence River basin. Exposure to elevated temperature reduced the growth and predatory performance of round gobies. Their decline in predatory performance was greatest at the highest microplastic concentration, regardless of temperature. The effects of environmentally relevant microplastic concentrations on the growth and performance of gobies were weaker than the effects of thermal stress. Given that the round goby is an abundant and widely distributed bottom‐dwelling fish in nearshore areas of the Great Lakes–St. Lawrence River basin, its responses to these co‐occurring stressors could have cascading effects on food webs.

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Gut content analysis of Lake Michigan waterbirds in years with avian botulism type E mortality, 2010–2012

Essian

Chipault

Lafrancois

et al. 2016

Journal of Great Lakes Research

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Waterbird die-offs caused by Clostridium botulinum neurotoxin type E (BoNT/E) have occurred sporadically in the Great Lakes since the late 1960s, with a recent pulse starting in the late 1990s. In recent die-offs, round gobies (Neogobius melanostomus) have been implicated as vectors for the transfer of BoNT/E to fish-eating birds due to the round goby invasion history and their importance as prey. Dreissenid mussels (Dreissena spp.) are also potentially involved in BoNT/E transmission to birds and round gobies. We examined gut contents of waterbirds collected in Lake Michigan during die-offs in 2010 -2012, and the gut contents of culled, presumably BoNT/E-free double-crested cormorants (Phalacrocorax auritus). Round gobies were found in 86% of the BoNT/E-positive individuals, 84% of the BoNT/E-negative birds, and 94% of the BoNT/E-free cormorants examined. Double-crested cormorants, ring-billed gulls (Larus delewarensis), and common loons (Gavia immer) consumed larger-sized round gobies than horned and red-necked grebes (Podiceps auritus and P. grisegena), white-winged scoters (Melanitta deglandi), and long-tailed ducks (Clangula hymealis). Other common prey included dreissenid mussels, terrestrial insects, and alewives (Alosa pseudoharengus). Our data emphasize the importance of round gobies and mussels in diets of Lake Michigan waterbirds and suggest they may play a role in the transfer of BoNT/E to waterbirds; however, round gobies and mussels were found in BoNT/E-positive, -negative, and -free individuals, suggesting that other factors, such as alternative trophic pathways for toxin transfer, bird migratory timing and feeding locations, prey behavior, and individual physiological differences across birds, may affect the likelihood that a bird will succumb to BoNT/E intoxication.

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From yellow perch to round goby: A review of double-crested cormorant diet and fish consumption at Three St. Lawrence River Colonies, 1999–2013

Cited by 14 publications

References 35 publications

Little Galloo Island, Lake Ontario: Two decades of studies on the diet, fish consumption, and management of double-crested cormorants

Little Galloo Island, Lake Ontario: Two decades of studies on the diet, fish consumption, and management of double-crested cormorants

Effects of elevated temperature and microplastic exposure on growth and predatory performance of a freshwater fish

Gut content analysis of Lake Michigan waterbirds in years with avian botulism type E mortality, 2010–2012

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