Survival, Growth, and Movement of Subadult Humpback Chub, <i>Gila Cypha,</i> in the Little Colorado River, Arizona

Dzul, Maria C.; Yackulic, Charles B.; Stone, Dennis M.; Haverbeke, David R. Van

doi:10.1002/rra.2864

Cited by 13 publications

(23 citation statements)

References 28 publications

(30 reference statements)

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“…), which would influence the growth of juvenile Humpback Chub (Robinson and Childs ; Petersen and Paukert ), and for the purpose of comparison they are consistent with seasonal growth of juvenile Humpback Chub that was reported by Dzul et al. () for the LCR. We tested for differences in growth rates across cohorts in each season by using analysis of variance (ANOVA), followed by Tukey's honest significant difference (HSD) tests to identify significant differences between cohorts.…”

Section: Methodssupporting

confidence: 86%

“…The survival rate of all of cohorts in Havasu Creek (≥0.23) also met or exceeded the estimates for five subadult cohorts in the LCR (see Dzul et al. ). These higher growth and survival rates could be explained by hatchery rearing and parasite treatment that would provide a greater advantage over rearing fish in the LCR.…”

Section: Discussionmentioning

confidence: 52%

“…The summer growth rates of the fish in Havasu Creek exceeded those that have been reported in the LCR (0.17–0.31 mm/d; Dzul et al. ), allowing juveniles to reach maturity at an accelerated rate. We found that the individuals in the 2011 cohort exhibited the highest growth rates, and some were in spawning condition only one year after release (as age‐2 fish), compared with the 3–4 years that is required for fish to reach maturity in the LCR (Yackulic et al.…”

Section: Discussionmentioning

confidence: 63%

“…We summarized the mean growth rates for "winter," defined as the period between October and April, and for "summer," the period between May and September. These two periods encompassed the seasonal thermal differences for Havasu Creek (Voichick and Wright 2007;Trammell et al 2012), which would influence the growth of juvenile Humpback Chub (Robinson and Childs 2001;Petersen and Paukert 2005), and for the purpose of comparison they are consistent with seasonal growth of juvenile Humpback Chub that was reported by Dzul et al (2016) for the LCR. We tested for differences in growth rates across cohorts in each season by using analysis of variance (ANOVA), followed by Tukey's honest significant difference (HSD) tests to identify significant differences between cohorts.…”

Section: Methodsmentioning

confidence: 74%

“…The survival rate of the cohorts that were translocated to Havasu Creek between 2011 and 2014 ranged from 0.40 to 0.56, which was approximately double the rates of two out of three of the cohorts in Shinumo Creek (range = 0.22-0.41, Spurgeon et al 2015b). The survival rate of all of cohorts in Havasu Creek (≥0.23) also met or exceeded the estimates for five subadult cohorts in the LCR (see Dzul et al 2016). These higher growth and survival rates could be explained by hatchery rearing and parasite treatment that would provide a greater advantage over rearing fish in the LCR.…”

Section: Discussionmentioning

confidence: 81%

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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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Section: Methodssupporting

confidence: 86%

Section: Discussionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 63%

Section: Methodsmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 81%

See 3 more Smart Citations

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

View full text Add to dashboard Cite

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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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Life and death in a dynamic environment: Invasive trout, floods, and intraspecific drivers of translocated populations

Healy

Budy

Conner

et al. 2022

Ecological Applications

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Understanding the relative strengths of intrinsic and extrinsic factors regulating populations is a long-standing focus of ecology and critical to advancing conservation programs for imperiled species. Conservation could benefit from an increased understanding of factors influencing vital rates (somatic growth, recruitment, survival) in small, translocated populations, which is lacking owing to difficulties in long-term monitoring of rare species. Translocations, here defined as the transfer of wild-captured individuals from source populations to new habitats, are widely used for species conservation, but outcomes are often minimally monitored, and translocations that are monitored often fail. To improve our understanding of how translocated populations respond to environmental variation, we developed and tested hypotheses related to intrinsic (density dependent) and extrinsic (introduced rainbow trout Oncorhynchus mykiss, stream flow and temperature regime) causes of vital rate variation in endangered humpback chub (Gila cypha) populations translocated to Colorado River tributaries in the Grand Canyon (GC), USA. Using biannual recapture data from translocated populations over 10 years, we tested hypotheses related to seasonal somatic growth, and recruitment and population growth rates with linear mixed-effects models and temporal symmetry mark-recapture models. We combined data from recaptures and resights of dispersed fish (both physical captures and continuously recorded antenna detections) from throughout GC to test survival hypotheses, while accounting for site fidelity, using joint live-recapture/live-resight models. While recruitment only occurred in one site, which also drove population growth (relative to survival), evidence supported hypotheses related to density dependence in growth, survival, and recruitment, and somatic growth and recruitment were further limited by introduced trout. Mixed-effects models explained between 67% and 86% of the variation in somatic growth, which showed increased growth rates with greater flood-pulse frequency during monsoon season. Monthly survival was 0.56-0.99 and 0.80-0.99 in the two populations, with lower survival during periods of higher intraspecific

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Survival, Growth, and Movement of Subadult Humpback Chub, Gila Cypha, in the Little Colorado River, Arizona

Cited by 13 publications

References 28 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

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.

Life and death in a dynamic environment: Invasive trout, floods, and intraspecific drivers of translocated populations

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