Non-indigenous fishes and their role in freshwater fish imperilment

Zanden, M. Jake Vander; Lapointe, Nicolas W. R.; Marchetti, Michael P.

doi:10.1017/cbo9781139627085.009

Cited by 11 publications

(2 citation statements)

References 142 publications

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“…Because these large dams and reservoirs frequently provide services including renewable energy and water security [5], many of them continue to be constructed worldwide [6]. Large dams and their respective reservoirs can profoundly alter riverine ecosystems including modification of hydrological regimes [7,8], degradation of habitat, loss of longitudinal connectivity [9,10], and proliferation of invasive species [11,12]. The artificial reservoir habitats created by dams [13] often contain a complex mixture of native and invasive species [14] and novel food webs [11].…”

Section: Introductionmentioning

confidence: 99%

Evidence for lasting alterations to aquatic food webs with short-duration reservoir draining

et al. 2019

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Large dams and their respective reservoirs provide renewable energy and water security, but also can profoundly alter riverine ecosystems. Here, we present evidence of changing aquatic food web structure in the seasons following short-duration, extreme manipulation of water levels in a reservoir (i.e., draining of the reservoir to the original riverbed during fall to assist outmigration of juvenile Chinook Salmon). We find unintended and lagged consequences of transitioning from a lake to a river, even temporarily, that resulted in trophic shifts away from piscivory and towards feeding at lower trophic levels for two common piscivorous fishes in reservoirs. Using natural abundances of nitrogen stable isotopes, we observed lower trophic level of feeding for invasive Largemouth Bass (Micropterus salmoides) and native Rainbow Trout (Oncorhynchus mykiss) during the summers following reservoir refilling than in nearby reference reservoirs that were not temporarily drained during fall. Declines in trophic levels of aquatic top predators have been rarely documented outside of controlled laboratory conditions. While useful for assisting outmigration of juvenile salmonids, the temporary draining of a reservoir to riverbed can also result in novel shifts in foodweb dynamics including reduced piscivory. As large dams continue to be operated and constructed worldwide, increased understanding of the community and ecosystem-level effects of reservoir management will be critical to evaluating trade-offs between human water needs, conservation of high value species, and ecosystem services impacted by river fragmentation.

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Section: Introductionmentioning

confidence: 99%

Evidence for lasting alterations to aquatic food webs with short-duration reservoir draining

et al. 2019

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“…Alien species are one of the main causes of the decline in native freshwater fish species (Vander Zanden, Lapointe, & Marchetti, 2016). Alien fish are introduced for food, trade, recreation (fishing, aquaria, waterbreeding), biological-control and other reasons.…”

Section: Introductionmentioning

confidence: 99%

Acclimatization of Poecilia reticulata (Peters, 1859) and Xiphophorus maculatus (Günther, 1866) (Cyprinodontiformes: Poeciliidae) in central Italy

et al. 2018

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Short‐term reservoir draining to streambed for juvenile salmon passage and non‐native fish removal

et al. 2019

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Fish passage out of reservoirs is a critical issue for downstream movement of juvenile salmonids and other migratory species. Reservoirs can delay downstream migrations by juvenile salmon for months or years. Here, we examine whether a novel management activity implementing annual short‐term draining of a reservoir to streambed improves timely downstream migration of juvenile salmonids. We analyse 12 years of fish capture data from a screw trap located downstream of Fall Creek Reservoir (Oregon, USA) to examine changes in timing of passage out of the reservoir and to compare fish species composition pre‐ and post‐draining. We observed a contraction in the timing of downstream migration for juvenile Chinook Salmon and reduction of yearlings in years following draining. We suggest that briefly draining the reservoir to streambed leads to reduced abundance of warm‐water invasive fishes in the reservoir after it refills. These changes could decrease predation and shift competition between invasive and resident riverine‐adapted native fishes in the reservoir. Collectively, our findings suggest that this low‐cost reservoir management option may improve passage and connectivity for juvenile Chinook Salmon while also decreasing the abundance of invasive fish species in the reservoir. This case study underscores the crucial need for further evaluations of reservoir draining in other systems and contexts.

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Non-indigenous fishes and their role in freshwater fish imperilment

Cited by 11 publications

References 142 publications

Evidence for lasting alterations to aquatic food webs with short-duration reservoir draining

Evidence for lasting alterations to aquatic food webs with short-duration reservoir draining

Acclimatization of Poecilia reticulata (Peters, 1859) and Xiphophorus maculatus (Günther, 1866) (Cyprinodontiformes: Poeciliidae) in central Italy

Short‐term reservoir draining to streambed for juvenile salmon passage and non‐native fish removal

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