Parasites of Fishes in the Colorado River and Selected Tributaries in Grand Canyon, Arizona

Linder, Chad M.; Cole, Rebecca A.; Hoffnagle, Timothy L.; Persons, Bill; Choudhury, Anindo; Haro, Roger J.; Sterner, Mauritz C.

doi:10.1645/ge-2538.1

Cited by 10 publications

(18 citation statements)

References 14 publications

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“…; Linder et al. , their 2006 surveys). The reason for the absence of Humpback Chub from Havasu Creek is open to speculation; however, habitat volume (Valdez et al.…”

Section: Methodsmentioning

confidence: 98%

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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“…; Linder et al. , their 2006 surveys). The reason for the absence of Humpback Chub from Havasu Creek is open to speculation; however, habitat volume (Valdez et al.…”

Section: Methodsmentioning

confidence: 98%

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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“…Lemly and Esch (1984a, 1984b, 1984c provided the first comprehensive study on blackspot disease in centrarchids. Rebecca Cole's projects in the Grand Canyon: publications by Choudhury et al (2004) and Linder et al (2012) together capture most of the information from a high-profile ecosystem.…”

Section: Milestone and Other Papersmentioning

confidence: 99%

Parasites of Freshwater Fishes In North America: Why So Neglected?

Scholz

Choudhury

2014

Journal of Parasitology

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Fish parasitology has a long tradition in North America and numerous parasitologists have contributed considerably to the current knowledge of the diversity and biology of protistan and metazoan parasites of freshwater fishes. The Journal of Parasitology has been essential in disseminating this knowledge and remains a significant contributor to our understanding of fish parasites in North America as well as more broadly at the international level. However, with a few exceptions, the importance of fish parasites has decreased during the last decades, which is reflected in the considerable decline of funding and corresponding decrease of attention paid to these parasites in Canada and the United States of America. After the 'golden age' in the second half of the 20th Century, fish parasitology in Canada and the United States went in a new direction, driven by technology and a shift in priorities. In contrast, fish parasitology in Mexico has undergone rapid development since the early 1990s, partly due to extensive international collaboration and governmental funding. A critical review of the current data on the parasites of freshwater fishes in North America has revealed considerable gaps in the knowledge of their species composition, host specificity, life cycles, evolution, phylogeography, and relationships with their fish hosts. As to the key question, "Why so neglected?" this is probably because: (1) fish parasites are not in the forefront due to their lesser economic importance; (2) there is little funding for this kind of research, especially if a practical application is not immediately apparent; and (3) of shifting interests and a shortage of key personalities to train a new generation (they switched to marine habitats or other fields). Some of the opportunities for future research are outlined, such as climate change and cryptic species diversity. A significant problem challenging future research seems to be the loss of trained and experienced fish parasitologists. This has 2 major ramifications: the loss of expertise in identifying organisms that other biologists (e.g., ecologists, molecular biologists, evolutionists) work with, and an incomplete comprehension of ecosystem structure and function in the face of climate change, emerging diseases, and loss of biodiversity.

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“…This is in contrast to other studies on this invasive parasite. For example, in the Colorado River and its tributaries, infection occurs in numerous cyprinids, and other species such as killifishes, catostomids, ictalurids, and salmonids also can be infected (Brouder and Hoffnagle, 1997;Choudhury et al, 2004;Linder et al, 2012). However, the sample sizes of other species in the present study were smaller than those for the emerald shiner and bluntnose minnow, which may account for the apparent absence in those hosts.…”

Section: Discussionmentioning

confidence: 59%

“…The secondary spread of S. acheilognathis as a result of baitfish movement has been implicated elsewhere in North America (Heckmann et al, 1993;Heckmann, 2000;Choudhury et al, 2004;Linder et al, 2012). The discovery of S. acheilognathi in emerald shiner purchased from bait retailers within the Great Lakes basin confirms that the cestode has reached sufficient prevalence in the wild to be harvested and transported throughout the commercial supply chain.…”

Section: Discussionmentioning

confidence: 95%

Range expansion and molecular confirmation of the Asian fish tapeworm in the lower Great Lakes and St. Lawrence River with notes on infections in baitfish

Marcogliese

Gendron

Forest

et al. 2016

Journal of Great Lakes Research

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Parasites of Fishes in the Colorado River and Selected Tributaries in Grand Canyon, Arizona

Cited by 10 publications

References 14 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

Parasites of Freshwater Fishes In North America: Why So Neglected?

Range expansion and molecular confirmation of the Asian fish tapeworm in the lower Great Lakes and St. Lawrence River with notes on infections in baitfish

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