Status of cisco (Coregonus artedi)                     ecomorphs in Lake Huron, 1917-2016, with speculations about phenotypic                     plasticity in shorthead cisco

Eshenroder, Randy L.; Olds, Chris; Kao, Yu‐Chun; Davis, Chris L.; Kinney, Devin N.; Muir, Andrew M.

doi:10.1127/adv_limnol/2021/0066

Cited by 11 publications

(36 citation statements)

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“…However, our data indicate that any shallow‐water Cisco taken in the North Channel will most likely be from that basin, any shallow‐water Cisco taken in Georgian Bay proper will most likely be from that basin, and any Cisco taken in waters along the north shore will likely be one of several types of shorthead cisco described by Eshenroder et al. (in press). Where exactly Nawash shorthead ciscoes go after spawning is under study.…”

Section: Discussionmentioning

confidence: 46%

“…This study and the Eshenroder et al. (in press) study add five ecomorphs to the two described by Koelz (1929; typical artedi and manitoulinus ) for Lake Huron. These additions are main‐basin shorthead cisco, Nawash shorthead cisco, putative shorthead cisco × typical artedi of Georgian Bay and of the North Channel (two ecomorphs), and Parry Sound cisco, which, along with manitoulinus , makes for six extant ecomorphs of shallow‐water cisco.…”

Section: Discussionmentioning

confidence: 61%

“…Eshenroder et al. (in press) reported that Lake Huron shallow‐water ciscoes of the size used in this study exhibited allometric growth (i.e., shape changed with size), but their TGR did not change with size (isometric growth) and, therefore, would not require size correction. We used an improved method of size correction developed in an unpublished paper that compares morphology among groups that, like ours, vary substantially in size.…”

Section: Methodsmentioning

confidence: 69%

“…These collections were combined as one group (North Channel) for the second PCA. This PCA resulted in North Channel (combined) and shorthead ciscoes of Potagannissing Bay (Eshenroder et al., in press) differentiating only marginally, while manitoulinus from Whalesback Channel (Eshenroder et al., in press) and historical typical artedi from Georgian Bay (Figure 3D) were well differentiated from each other and from the North Channel (combined) and Potagannissing Bay collections. The first two PCs explained 73% of the variation.…”

Section: Resultsmentioning

confidence: 97%

“…However, Eshenroder et al. (in press) proposed that manitoulinus may only represent the effects of river water retained in Whalesback Channel on early development. This conjecture may explain at least some of the morphological diversity in the North Channel.…”

Section: Discussionmentioning

confidence: 99%

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Replacement of the Typical artedi Form of Cisco Coregonus artedi in Lake Huron by Endemic Shallow‐Water Ciscoes, Including Putative Hybrids

et al. 2021

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Various ecomorphs of the shallow-water Cisco Coregonus artedi were the dominant fish planktivores in each of the Great Lakes until invasive species and overfishing resulted in extirpations and extinctions. In this paper, we describe the present morphological diversity and distribution of shallow-water Ciscoes in each of Lake Huron's three basins: the main basin, Georgian Bay, and the North Channel. Typical artedi, a formerly widespread ecomorph that had supported the lake's largest fishery, appears to have been extirpated from all three basins. Three types of shorthead cisco, a recently described and variable ecomorph, were extant. One type was morphologically robust and abundant along the north rim of the lake. The second type was large bodied, terete (streamlined), short finned, and collected at only one location in the main basin. The third type consisted of putative shorthead cisco × typical artedi hybrids, which were widespread in Georgian Bay and the North Channel. Only the putative hybrids were regularly collected in midwater trawls, suggesting that they were more pelagic, which we attribute to an inferred partial ancestry with typical artedi. The putative shorthead cisco × typical artedi hybrids of Georgian Bay and the North Channel have replaced typical artedi to some degree, while shorthead ciscoes in the main basin, though possibly more abundant now than in the past, have not measurably replaced typical artedi. Even with the apparent extirpation of typical artedi, Lake Huron has a greater diversity of shallow-water Ciscoes than any of the other Great Lakes, which we attribute to its more complex topography.

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Section: Discussionmentioning

confidence: 46%

Section: Discussionmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Replacement of the Typical artedi Form of Cisco Coregonus artedi in Lake Huron by Endemic Shallow‐Water Ciscoes, Including Putative Hybrids

et al. 2021

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Comparison of traditional and geometric morphometrics using Lake Huron ciscoes of the Coregonus artedi complex

et al. 2023

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Objective: Here we determine how traditional morphometrics (TM) compares with geometric morphometrics (GM) in discriminating among morphologies of four forms of ciscoes of the Coregonus artedi complex collected from Lake Huron.Methods: One of the forms comprised two groups of the same deepwater cisco separated by capture depth, whereas the other three forms were shallow-water ciscoes.Result: Our three groups of shallow-water ciscoes were better separated (3% vs. 19% overlap) in principle component analysis (PCA) with TM data than with GM data incorporating semilandmarks (evenly spaced nonhomologous landmarks used to bridge between widely separated homologous landmarks). Our two deepwater cisco groups, comprising a putatively single form collected from different depths, separated more in PCAs with GM data (33% overlap) than in PCAs with TM data (66% overlap), an anomaly caused by greater decompression of the swim bladder and deformation of the body wall in the group captured at greater depths. Separation of the two deepwater cisco groups captured at different depths was not affected by the removal of semilandmarks. Assignment of forms using canonical variate analysis accurately assigned 86% of individuals using TM data, 98% of individuals using GM data incorporating semilandmarks, and 100% of individuals using GM data without semilandmarks. However, we considered assignments from the same form of deepwater cisco into separate groups as misassignments resulting from different capture depths, which reduced the accuracy of assignments with GM data incorporating semilandmarks to 66%. Conclusion:Our study implies that TM will continue to have an important role in morphological discrimination within Coregonus and other fishes similarly shaped.

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A review of cisco form diversity and lake depth in North America: An ecological opportunity gradient with Mysis diluviana

Ridgway

Bell

Middel

2022

Journal of Great Lakes Research

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Status of cisco (Coregonus artedi) ecomorphs in Lake Huron, 1917-2016, with speculations about phenotypic plasticity in shorthead cisco

Cited by 11 publications

References 0 publications

Replacement of the Typical artedi Form of Cisco Coregonus artedi in Lake Huron by Endemic Shallow‐Water Ciscoes, Including Putative Hybrids

Replacement of the Typical artedi Form of Cisco Coregonus artedi in Lake Huron by Endemic Shallow‐Water Ciscoes, Including Putative Hybrids

Comparison of traditional and geometric morphometrics using Lake Huron ciscoes of the Coregonus artedi complex

A review of cisco form diversity and lake depth in North America: An ecological opportunity gradient with Mysis diluviana

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