Why are larger fish farther upstream? Testing multiple hypotheses using Silver Chub in two Midwestern United States riverscapes

Perkin, Joshuah S.; Kočovský, Patrick M.; Steffensmeier, Zachary D.; Gido, Keith B.

doi:10.1002/nafm.10903

Cited by 3 publications

(3 citation statements)

References 133 publications

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“…Larson et al (2016) and Camacho et al (2019) reported that genetically confirmed Silver Chub eggs were collected in surface ichthyoplankton nets in the upper Mississippi River basin, indicating eggs might be semibuoyant, which would mean Silver Chub are pelagophils. Furthermore, Perkin et al (2023, this special section) reported greater Silver Chub recruitment in longer pools of the Ohio River, which is consistent with the species being a pelagophil (i.e., longer drift potential leading to greater hatching success). In Lake Erie, the only two confirmed Silver Chub larvae were collected in western Lake Erie in ichthyoplankton nets deployed near the surface.…”

Section: Discussionsupporting

confidence: 77%

Assessing potential spawning locations of Silver Chub in Lake Erie

McKenna,

Bowen,

Farver

et al. 2023

N American J Fish Manag

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ObjectiveSilver Chub Macrhybopsis storeriana, a predominately riverine species throughout its native range, exists within Lake Erie as the only known lake population. Its population declined in the 1950s and never fully recovered. Canada has listed Silver Chub in the Great Lakes–St. Lawrence River as endangered and has initiated a recovery plan that recognized the identification of spawning areas as a critical component to inform Silver Chub's recovery potential.MethodsWe investigated potential spawning locations of Silver Chub using capture records, otolith microchemistry, and daily age analysis. Lapillus otolith Sr:Ca ratios from 27 age‐0 Silver Chub were used to identify potential spawning areas. Daily ages estimated from lapilli were used to calculate hatch dates, which then were compared with capture data of adults and river flows to further inform potential spawning areas.ResultThe Detroit River (and its nearshore area) was all but ruled out as a potential spawning location. The Maumee, Portage, and Sandusky rivers or their nearshore areas were all possible spawning locations. Projected hatch dates spanned the end of May through the end of June and occurred across a wide range of flows, although some peaks in hatch dates corresponded to flow peaks, indicating recruitment is potentially enhanced by high flows.ConclusionSilver Chub spawning period and hypothesized spawning rivers or lacustuaries overlap those of invasive Grass Carp Ctenopharyngodon idella, creating a need to jointly consider Grass Carp control efforts with conservation of Silver Chub when assessing management alternatives. Further research on spawning guild and the use of rivers themselves or nearshore areas influenced by rivers as spawning areas are required to maximize potential for conservation and recovery of Silver Chub.

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Section: Discussionsupporting

confidence: 77%

Assessing potential spawning locations of Silver Chub in Lake Erie

McKenna,

Bowen,

Farver

et al. 2023

N American J Fish Manag

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“…In addition, study of the effects of barriers on population viability could be beneficial. Silver Chub is thought to broadcast spawn in open waters (Werner 2004;McKenna et al 2023), and migration is likely an important part of its life cycle (for more details, see Perkin et al 2023, this special section).…”

Section: Genetic Diversity Of Silver Chub Could Be Affected By Habita...mentioning

confidence: 99%

Genetic structure of the Silver Chub indicates distinctiveness of Lake Erie population

Elbassiouny,

Fontenelle,

Kočovský

et al. 2023

N American J Fish Manag

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ObjectiveSilver Chub Macrhybopsis storeriana is a small riverine minnow endemic to North American fresh waters. Its range extends from the southern USA to southcentral Canada; the latter includes a rare lacustrine population in Lake Erie. Anthropogenic activities pose an immediate threat to several Silver Chub populations, currently categorized from special concern to threatened at the state level in the USA and federally and provincially not‐at‐risk to endangered in Canada. Several studies have examined the anthropogenic causes for the decline of Silver Chub populations, but conservation efforts have been hindered by the lack of knowledge of the population genetics of this species.MethodsHere, we provide an assessment of the genetic diversity of Silver Chub populations across the USA and Canada using a fast‐evolving mitochondrial gene, with particular focus on the Lake Erie population.ResultWe found the Lake Erie population to be divergent from all other populations, with nearly all the haplotypes sampled there being private.ConclusionOur study provides genetic evidence that the Silver Chub population in Lake Erie could be considered a separate conservation unit.

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“…Steffensmeier et al (2023, this special section) develop a method for incorporating movement ecology into models describing the distribution of Prairie Chub in the Red River of the South. Perkin et al (2023b, this special section) study longitudinal variation in size distributions of Silver Chub in the Arkansas and Ohio River basins and provide implications for management of longitudinal connectivity. Wedgeworth et al (2023, this special section) and Perkin et al (2023a, this special section) study flow–recruitment relationships for the Prairie Chub and the Shoal Chub, respectively, and separately report positive correlations between streamflow variability and hatch success in regulated rivers.…”

Section: Figurementioning

confidence: 99%