California roach (Hesperoleucus symmetricus) in the Eel River of northwestern California: native or introduced?

Kinziger, Andrew P.; Nakamoto, Rodney J.; Aguilar, Andres; Harvey, Bret C.

doi:10.1007/s10641-019-00870-x

Cited by 1 publication

(2 citation statements)

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“…Nonetheless, the numbers of individuals and locations examined in this study were almost certainly insufficient to fully inventory genetic variation in the likely source areas ( e.g ., Klamath and Rogue rivers). When sampling is insufficient and imbalanced ( e.g ., see Table 1), it is not surprising to find unique variation in introduced populations (Hänfling et al ., 2002; Johnson et al ., 2011; Kelly et al ., 2006; Kinziger et al ., 2019; Marques et al ., 2016; Vidal et al ., 2010). The possibility remains that the results of this study reflect a bottleneck event rather than a founder effect associated with an introduction.…”

Section: Discussionmentioning

confidence: 99%

“…This likely example of introduction from an adjacent drainage joins three others involving obligate freshwater fishes in northwestern California (Kinziger et al ., 2011, 2014, 2019). Combined with the fact that all four of these examples and many others offer evidence of successful establishment of populations by very few founders, single vicinal introduction events appear to deserve consideration in efforts to limit invasive species.…”

Section: Discussionmentioning

confidence: 99%

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Recent, small beginnings: genetic analysis suggests Catostomus rimiculus (Klamath smallscale sucker) in the Smith River, California, are introduced

Kinziger

White

Nakamoto

et al. 2021

Journal of Fish Biology

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Identification of introduced species can be important to understanding ecological systems and meeting conservation and management goals, but the process can be surprisingly challenging. The Klamath smallscale sucker Catostomus rimiculus seems likely to be native to the Smith River because the drainage separates two basins believed to be within the fish's native range, the Rogue and Klamath rivers. Further, C. rimiculus is broadly distributed in the Smith River, and the indigenous Dee-ni' People of the Smith River have a unique word for sucker. Nonetheless, a historical survey of fishes that described C. rimiculus from the Rogue and Klamath rivers did not include C. rimiculus among the fishes of the Smith River. To determine whether the genetic structure of the Smith River C. rimiculus reflects expectations for a native sucker population, the authors of this study examined variation in microsatellite and mitochondrial genetic markers from the Smith River and surrounding drainages. The genetic analyses revealed a pattern consistent with extreme founder effects in Smith River C. rimiculus, as would be expected from a single introduction of six or fewer effective individuals. The sharing of a high-frequency haplotype between the Smith River and Klamath River that is not detected in the Rogue River suggests the Klamath River as the likely source for the introduction. The findings highlight that local-scale introductions can be easily overlooked because the newly established populations can appear to be parts of contiguous natural distributions.

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