Towards using thermal stress thresholds to predict salmonid invasion potential

Ellender, Bruce R.; Rivers-Moore, NA; Coppinger, Christine R.; Bellingan, Terence A.; Weyl, Olaf L. F.

doi:10.1007/s10530-016-1244-9

Cited by 16 publications

(29 citation statements)

References 38 publications

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“…Trout and black bass often act synergistically on native fish populations. Trout are cold water species that are established in cooler headwater reaches of rivers (Ellender et al 2016;Shelton et al 2018), from which they exclude native fishes through predation and competition. Downstream trout populations are limited by temperature, which also mediates their predatory impacts (Shelton et al 2018).…”

Section: Fishmentioning

confidence: 99%

An Evaluation of the Impacts of Alien Species on Biodiversity in South Africa Using Different Assessment Methods

Zengeya

Kumschick

Weyl

et al. 2020

Biological Invasions in South Africa

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Studies of the impact of alien species on the environment are increasingly being carried out, and there has been ongoing debate about how to standardise the description of these impacts. This chapter evaluates the state of knowledge on the impacts of alien species on biodiversity in South Africa based on different assessment methods. Despite South Africa being one of the most biologically diverse countries in the world, there have been very few studies that formally document the impacts of alien species on biodiversity. Most of what is known is based on expert opinion, and consequently the level of confidence in the estimates of the magnitude of these impacts is low. However, it is clear that a significant number of alien species cause major negative impacts, and that there is cause for serious concern. There is a

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Section: Fishmentioning

confidence: 99%

An Evaluation of the Impacts of Alien Species on Biodiversity in South Africa Using Different Assessment Methods

Zengeya

Kumschick

Weyl

et al. 2020

Biological Invasions in South Africa

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“…As water temperatures and rainfall variability increase, trout distributions may contract into cooler, higher‐altitude river reaches that are accessible. This was demonstrated by Ellender et al () for S. trutta and O. mykiss in the Keiskamma River system, South Africa, and has also been forecast in their native and introduced ranges in the USA (Bryant, ; Ebersole et al, ; Flebbe, Roghair, & Bruggink, ). The remaining 15 non‐native species are considered warm‐water fishes and are therefore probably more resistant to impacts of climate change, and their distributions and abundances are unlikely to decrease unless actively controlled through management interventions.…”

Section: Discussionmentioning

confidence: 63%

“…Moreover, the distributions of some of these species are expanding because of active introductions into new habitats, or because they lack natural population controls outside of their native ranges (Ellender & Weyl, ; Shelton, Samways, & Day, ; Weyl, Daga, Ellender, & Vitule, ; Weyl, Ellender, Wasserman, & Woodford , ). However, the salmonids O. mykiss and S. trutta tolerate a relatively narrow range of environmental conditions, and are highly sensitive to habitat degradation (Ebersole, Liss, & Frissell, ; Ellender, Rivers‐Moore, Coppinger, Bellingan, & Weyl, ; Leprieur et al, ), hence their relatively high vulnerabilities.…”

Section: Discussionmentioning

confidence: 99%

Vulnerability of Cape Fold Ecoregion freshwater fishes to climate change and other human impacts

Shelton

Weyl

Chakona

et al. 2017

Aquatic Conservation

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1. Native freshwater fish populations throughout South Africa's Cape Fold Ecoregion (CFE) are in decline as a result of human impacts on aquatic habitats, including the introduction of nonnative freshwater fishes. Climate change may be further accelerating declines of many species, although this has not yet been studied in the CFE. This situation presents a major conservation challenge that requires assigning management priorities through assessing species in terms of their vulnerability to climate change.2. One factor hindering reliable vulnerability assessments and the concurrent development of effective conservation strategies is limited knowledge of the biology and population status of many species. This paper reports on a study employing a rapid assessment method used in the USA, designed to capitalize on available expert knowledge to supplement existing empirical data, to determine the relative vulnerabilities of different species to climate change and other human impacts. Eight local freshwater fish experts conducted vulnerability assessments on 20 native and 17 non-native freshwater fish species present in the CFE.3. Results show (1) that native species were generally classified as being more vulnerable to extinction than were non-native species, (2) that the climate change impacts are expected to increase the vulnerability of most native, and some non-native, species, (3) that vulnerability hotspots requiring urgent conservation attention occur in the Olifants-Doring, upper Berg and upper Breede River catchments in the south west of the region, (4) that in addition to providing guidance for prioritizing management interventions, this study highlights the need for reliable data on the biology and distribution of many CFE freshwater fishes, and (5) that identification of priority areas for protection should be based on multiple sources of data.

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“…Differences in land use across the landscape can alter fish community structure and dynamics by altering the local hydrology, water chemistry or sediment regimes [21][22][23][24]. Large-scale impacts from human land uses (such as agriculture or urbanization) can change these parameters beyond optimal or even tolerable levels for fish [25], especially highly specialized species like trout [26,27]. Plantation forestry in particular has shown negative impacts on brown trout [28], bull trout [29], lake trout [30] and rainbow trout [31], among others, showing the potential for forestry to act as a negative control for trout, as observed tangentially in plantations of exotic pine in southern Chile [32].…”

Section: Negative Impacts Of Forestry On Troutmentioning

confidence: 99%

“…In this study, the sites with trout having significantly lower Fulton's k were both in sites with complete or a partial lack of canopy cover, which diminished the allochthonous carbon inputs, leading to lower numbers of prey species. Removal of canopy cover would also permit radiative heating [46], possibly increasing water temperatures to be higher than what trout can tolerate [20,26,27], but be well within the preferences for local native fishes [51]. Other mechanisms could capitalize on the thermal range limits of trout to upland streams [8] in this region to construct barriers to fish passage at or near the summer range limit for trout.…”

Section: Implications For Invasive Species and Conservation Managementmentioning

confidence: 99%

Invasive Rainbow Trout (Oncorhynchus mykiss) Are Not Affected by Different Land Uses in a Multi-Use, Mediterranean Climate Landscape

Lacy

Ugalde

Mao

2018

Fishes

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Land use carries implications for freshwater fish conservation. Plantation forestry practices have been shown to have negative impacts on resident fish fauna, but little work has been conducted to assess these impacts on invasive vs. native fish populations. Ten headwater catchments in the Mediterranean climate zone of Chile were used to assess the impacts of land use (pine plantations vs. native forests) on fish condition (length-weight relationship) and abundance (catch-per-unit-effort (CPUE)) of the invasive trout Oncorhynchus mykiss and the threatened native catfish Nematogenys inermis. Negative impacts on trout condition were associated with a lack of canopy cover and river topology. The presence of N. inermis was associated with catchment factors less favourable to trout. Current environmental regulations and forestry management practices do not appear to create negative pressures on invasive trout from land use practices, despite expectations from the literature. Assessing how land use management regulations impact invasive and native fishes should be a part of species conservation and territorial planning.

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Towards using thermal stress thresholds to predict salmonid invasion potential

Cited by 16 publications

References 38 publications

An Evaluation of the Impacts of Alien Species on Biodiversity in South Africa Using Different Assessment Methods

An Evaluation of the Impacts of Alien Species on Biodiversity in South Africa Using Different Assessment Methods

Vulnerability of Cape Fold Ecoregion freshwater fishes to climate change and other human impacts

Invasive Rainbow Trout (Oncorhynchus mykiss) Are Not Affected by Different Land Uses in a Multi-Use, Mediterranean Climate Landscape

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