Population Expansion of Humpback Chub In Western Grand Canyon and Hypothesized Mechanisms

Haverbeke, David R. Van; Stone, Dennis M.; Dodrill, Michael J.; Young, Kirk L.; Pillow, Michael J.

doi:10.1894/0038-4909-62.4.285

Cited by 23 publications

(49 citation statements)

References 29 publications

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“…; Van Haverbeke et al. ) was thought to limit the population in Grand Canyon (Valdez et al. ; Trammell et al.…”

Section: Discussionmentioning

confidence: 99%

“…These potentially contributed to the recently expanding populations in western Grand Canyon (Van Haverbeke et al. ; Rogowski et al. ), thereby partially fulfilling the conservation goals for the species (USFWS ).…”

Section: Discussionmentioning

confidence: 99%

“…) or in other reaches of the Colorado River (Van Haverbeke et al. ; Rogowski et al. ), meeting management goals for rearing.…”

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confidence: 99%

“…Both efforts were successful in promoting the growth and survival of juveniles, but high emigration rates that were associated with flooding (Van Haverbeke et al 2013;Spurgeon et al 2015b) or competition with nonnative fishes may have limited the persistence and establishment of new populations (Pine et al 2013;Spurgeon et al 2015a). Nevertheless, substantial numbers of Humpback Chub that have dispersed from translocation sites have been observed later integrating with downstream aggregations in the LCR (Van Haverbeke et al 2013) or in other reaches of the Colorado River (Van Haverbeke et al 2017;Rogowski et al 2018), meeting management goals for rearing. For example, one goal for the conservation of Humpback Chub in Grand Canyon is to expand the role of tributaries in increasing the distribution and size of aggregations in the Colorado River (USFWS 2011:12).…”

mentioning

confidence: 99%

“…heavily parasite-infected fish of the LCR (reviewed in Campbell et al 2019). Individual growth is critical to the survival and reproductive fitness of fish, and the lack of juvenile rearing and recruitment to maturity in the colder postdam waters of the Colorado River (Robinson and Childs 2001;Yackulic et al 2014;Van Haverbeke et al 2017) was thought to limit the population in Grand Canyon (Valdez et al 2000;Trammell et al 2012). For TABLE 3.…”

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confidence: 99%

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Establishment of a Reproducing Population of Endangered Humpback Chub through Translocations to a Colorado River Tributary in Grand Canyon, Arizona

Healy

Smith

Schelly

et al. 2020

N American J Fish Manag

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Translocations, defined herein as the human‐assisted movement of individuals from a source population to other waters within their historical range, are prevalent in recovery plans for endangered fishes. Many translocations fail to establish new populations, however, and outcomes are often poorly documented. Endangered Humpback Chub Gila cypha persist as a self‐sustaining population in Grand Canyon, Arizona, despite threats from introduced nonnative competitors and predators and modified flow, thermal, and sediment regimes due to river regulation. In the decades following the completion of Glen Canyon Dam, the Grand Canyon population has been primarily sustained through reproduction in a single Colorado River tributary, the Little Colorado River (LCR). To establish population redundancy and aid in recovery, we annually translocated between 243 and 509 juvenile Humpback Chub from the LCR to Havasu Creek, a smaller Colorado River tributary in Grand Canyon National Park. Juvenile Humpback Chub were collected from the wild and reared in a hatchery for 8–12 months prior to the translocations. Through biannual mark–recapture sampling in Havasu Creek, we estimated annual abundance for all of the translocated cohorts and found that apparent survival and growth rates met or exceeded the demographic rates that are published for the LCR. We observed reproductively mature adults each year in May, beginning in 2012, and untagged juvenile Humpback Chub beginning in the following year and every year thereafter, with results that indicated successful reproduction. Beginning in 2016, we noted recruitment to maturity of fish that were produced in situ and the population's abundance increased through 2018, indicating potential for the establishment of a self‐sustaining population. As an example of the successful translocation of an endangered species that demonstrates the potential importance of tributaries in the recovery of large‐river fishes, our study may help to inform future recovery planning.

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“…; Van Haverbeke et al. ) was thought to limit the population in Grand Canyon (Valdez et al. ; Trammell et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…) or in other reaches of the Colorado River (Van Haverbeke et al. ; Rogowski et al. ), meeting management goals for rearing.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Establishment of a Reproducing Population of Endangered Humpback Chub through Translocations to a Colorado River Tributary in Grand Canyon, Arizona

Healy

Smith

Schelly

et al. 2020

N American J Fish Manag

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The Colorado River

et al. 2022

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Why new scientific information is important for native fish conservation: A case study from the humpback chub (Gila cypha) in the Grand Canyon, U.S.A.

Boyer,

Fonken,

Rogowski

2024

Aquatic Conservation

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Habitat descriptions found in critical habitat designations and recovery plans are important for protecting endangered species. However, in order to protect critical habitat, it is necessary to update descriptions of habitat use when range shifts occur or new studies change the understanding of habitat use. This study examined the habitat use of a threatened desert fish to determine whether current habitat use matched the descriptions in recovery documents. Recovery documents describe humpback chub (Gila cypha) as being dependent on rocky, canyon‐bound habitats during all life stages, but recent surveys found humpback chub in open, silt‐laden habitats, suggesting this species may be able to occupy a wider range of habitats. Hoop net catch data from a long‐term monitoring project in the Colorado River were used to compare catches of two size classes: juvenile/subadult (<200 mm total length [TL]) and adult humpback chub (≥200 mm TL). Catch information was analysed on an individual net scale and on a geological segment scale using generalized linear mixed models. There was no difference in juvenile/subadult humpback chub catch between hoop nets set in rocky habitat compared with habitat with only fine sediment. Humpback chub catch for all life stages in a river segment characterized by silt banks exceeded or was not significantly different from catch in rocky segments. This case study demonstrates the importance of revisiting habitat descriptions, sampling in areas outside known or expected habitat and incorporating new data related to range expansion or habitat changes in recovery strategies to better describe and protect habitats that can support imperilled species.

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Population Expansion of Humpback Chub In Western Grand Canyon and Hypothesized Mechanisms

Cited by 23 publications

References 29 publications

Establishment of a Reproducing Population of Endangered Humpback Chub through Translocations to a Colorado River Tributary in Grand Canyon, Arizona

Establishment of a Reproducing Population of Endangered Humpback Chub through Translocations to a Colorado River Tributary in Grand Canyon, Arizona

The Colorado River

Why new scientific information is important for native fish conservation: A case study from the humpback chub (Gila cypha) in the Grand Canyon, U.S.A.

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