Distribution, Fecundity, and Genetics of Cercopagis pengoi (Ostroumov) (Crustacea, Cladocera) in Lake Ontario

Makarewicz, Joseph C.; Grigorovich, Igor A.; Mills, Edward L.; Damaske, Elizabeth; Cristescu, Melania E.; Pearsall, Webster; LaVoie, Michael J.; Keats, Rachel A.; Rudstam, Lars G.; Hebert, Paul D. N.; Halbritter, Heather; Kelly, Thomas C.; Matkovich, Carolyn; MacIsaac, Hugh J.

doi:10.1016/s0380-1330(01)70620-x

Cited by 53 publications

(62 citation statements)

References 26 publications

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“…Appendix 1 of Johannsson et al 2000). Although there is some variation in the relationships for C. pengoi (e.g., Grigorovich et al 2000;Makarewicz et al 2001;Ojaveer et al 2001), this was not a concern given the distinctly greater weight of C. pengoi relative to other zooplankters and our consideration of abundance rather than biomass.…”

Section: Methodsmentioning

confidence: 95%

“…The greater abundances and propensity for population growth (egg production) exhibited by C. pengoi (Grigorovich et al 2000;Makarewicz et al 2001) suggest that it may have a considerable impact. This impact is compounded by the possession of a long caudal appendage that is five to eight times the body length (i.e., 6-10 mm), with a distinctive terminal loop (Grigorovich et al 2000).…”

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confidence: 99%

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Assessing the impact of a recent predatory invader: The population dynamics, vertical distribution, and potential prey of Cercopagis pengoi in Lake Ontario

Benoît

Johannsson

Warner

et al. 2002

Limnology & Oceanography

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The predatory impacts of Cercopagis pengoi, a planktivorous cladoceran first observed in Lake Ontario in 1998, were assessed by examining patterns in the distribution and population dynamics of macrozooplankton. Specifically, we determined the vertical distribution of C. pengoi in Lake Ontario with respect to other zooplankton species and possible biotic and abiotic controlling factors and used seasonal time series of potential prey species, both before and after C. pengoi invasion, to make inferences about predatory impacts of C. pengoi. The highest abundances of C. pengoi generally occurred at the bottom of the epilimnion or at the top of the metalimnion, and strong diel vertical migration was not observed. The vertical distribution of cyclopoid and calanoid nauplii and copepodids was deeper in 1999 than had historically been observed, which suggest possible avoidance of C. pengoi or localized predatory depletion. Seasonal analyses of normalized biomass size spectra from the Bay of Quinte supported an impact of C. pengoi on organisms Ͻ0.1 g dry weight. The hypothesized predatory effect on juvenile copepods was supported by an analysis of seasonal time series, where we observed that high abundances of C. pengoi coincided with marked decreases in these groups. Consequently, the presence of C. pengoi likely decreases the production of juvenile copepods both through direct predation and through a shift of copepod vertical distribution to colder waters. Among the cladocerans, only Bosmina longirostris abundance declined in the presence of C. pengoi in the analysis of seasonal time series.

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Section: Methodsmentioning

confidence: 95%

mentioning

confidence: 99%

Assessing the impact of a recent predatory invader: The population dynamics, vertical distribution, and potential prey of Cercopagis pengoi in Lake Ontario

Benoît

Johannsson

Warner

et al. 2002

Limnology & Oceanography

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“…Populations of C. pengoi in Lake Ontario during first years after invasion also possess unusual midsummer sexual reproduction Makarewicz et al 2001), characteristic for source population in the Baltic Sea (Neva Estuary), and for Bythotrephes in Harp Lake (see above). Despite existing potential of waterfowl to transfer of resting eggs of Cercopagis, boaters and ballast water of ships are considered as primary vectors of C. pengoi dispersal in Great Lakes area (Makarewicz et al 2001).…”

Section: Cercopagis Pengoimentioning

confidence: 99%

“…From Lake Ontario, C. pengoi in few years spread to Lake Michigan, Lake Erie and some adjacent inland lakes (Charlebois et al 2001;Therriault et al 2002). Currently this species playing an important role in zooplankton of Lake Ontario, even suppressing some native zooplankton species (Ojaveer et al 2001;Makarewicz et al 2001;Benoit et al 2002;Laxson et al 2003;Makarewicz et al 2003).…”

Section: Cercopagis Pengoimentioning

confidence: 99%

“…Despite existing potential of waterfowl to transfer of resting eggs of Cercopagis, boaters and ballast water of ships are considered as primary vectors of C. pengoi dispersal in Great Lakes area (Makarewicz et al 2001). Potential for dispersal with fishing equipment for Cercopagis even higher, than for Bythotrephes, because specific morphological feature of its caudal appendage, which is longer and possesses terminal loop (this feature is reflected in North American common name of C. pengoi: "fishhook waterflea").…”

Section: Cercopagis Pengoimentioning

confidence: 99%

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