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Dunham, Jason B.; Adams, Susan B.; Schroeter, Robert E.; Novinger, Douglas C.

doi:10.1023/a:1025338203702

Cited by 171 publications

(22 citation statements)

References 77 publications

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“…Dunham et al 2002) or in different invaded ranges (e.g. Kado 2003;Sadchatheeswaran et al 2015) and then assimilated in reviews and meta-analyses (e.g.…”

Section: Resultsmentioning

confidence: 99%

Mind the gap – context dependency in invasive species impacts: a case study of the ascidian Ciona robusta

Robinson¹,

Havenga²,

Merwe³

et al. 2017

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In the face of increasing invasions and limited resources, appropriate management of invasive species requires prioritisation of species for management action. This process often relies on knowledge of species specific impacts. However, as studies explicitly measuring impact of marine alien species are rare, prioritisation of management actions is often based on studies from outside the geographic area of interest. Further, few impact studies account for context dependency (e.g. seasonal variability or distinct environmental regimes), raising the question of how transferrable knowledge about the impact of a species is between invaded ranges. This study addressed this question by using the widespread invasive solitary ascidian Ciona robusta as a case study for assessing impacts across two invaded regions: South Africa and California, USA. We replicated a previously conducted experiment from California that showed that C. robusta depresses local species richness in San Francisco Bay. Our South African experiment showed no effect of C. robusta on species richness, the Shannon-Weiner diversity index or community composition, despite experiments being carried out over two years and at two depths. While these results may reflect strong density dependency in the impact of C. robusta, they serve to highlight context dependency in invasive species impacts. This suggests that until studies of impact in marine systems become common place, context dependency should be explicitly addressed as a source of uncertainty during the prioritisation of species for management action.

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“…Dunham et al 2002) or in different invaded ranges (e.g. Kado 2003;Sadchatheeswaran et al 2015) and then assimilated in reviews and meta-analyses (e.g.…”

Section: Resultsmentioning

confidence: 99%

Mind the gap – context dependency in invasive species impacts: a case study of the ascidian Ciona robusta

Robinson¹,

Havenga²,

Merwe³

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Bull Trout are well-known for migrating long distances through riverine networks, and these individuals can attain very large sizes (>50 cm) and corresponding fecundities (Rieman & McIntyre, 1993). Loss of migratory life history expression may compromise the ability of Bull Trout to effectively compete with a closely related invader, Brook Trout (S. fontinalis; Dunham, Adams, Schroeter, & Novinger, 2002). Although direct empirical evidence is lacking, demographic modeling show that coexistence of Bull Trout and Brook Trout might be possible when Bull Trout can express a migratory life history (Benjamin, McDonnell, Dunham, Brignon, & Peterson, 2017).…”

Section: Restore Life History Diversitymentioning

confidence: 99%

What to do when invaders are out of control?

et al. 2020

Self Cite

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Biological invasions threaten species and ecosystems worldwide. Impacts from invasions are especially prevalent in freshwaters, where managers have struggled to contain the problem. Conventional approaches to managing invaders focus on prevention and control. In practice, these measures have proven to be variably effective. Control or eradication of established invaders is particularly difficult and, even if ecologically feasible, it may not be socially desirable. Here we propose a new alternative to managing invasive species: managing impact modifiers (MIM). The MIM approach focuses on managing impacts, rather than controlling the invader directly. We reviewed the literature for the world's worst invasive fishes in freshwaters to show there is strong evidence to support the potential for MIM as an effective means of managing impacts of invasions. This included evidence pointing to characteristics of the environment or species themselves that modify impacts of invasions. Detail of three case studies reinforces the potential for MIM as a viable option. Although MIM appears promising, effective application could involve significant investment in an information gathering phase to identify impact modifiers and the means to manage them. Accordingly, MIM is best incorporated into management plans that include a strong learning or adaptive component. Ultimately, MIM may be one of the only viable alternatives for managing invasive species that are truly out of control. This article is categorized under: Water and Life > Nature of Freshwater Ecosystems Water and Life > Stresses and Pressures on Ecosystems Water and Life > Conservation, Management, and Awareness

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“…Though predicted increases in seasonal thermal maxima are not expected to exceed physiological optimum temperatures for these species (Bear, McMahon, and Zale 2007;Christianson, Johnson, and Hooten 2020), warmer and longer growing seasons resulting from reduced snowpack will increase the amount of food required to meet metabolic demands and growth (Borgstrøm 2001) in these highly oligotrophic, food-limited lakes (Bahls 1992). Thus, climate change has the potential to intensify existing competitive interactions between trout species (Dunham et al 2002;McGrath and Lewis 2007;Benjamin and Baxter 2012) and amplify the trophic effects of fish on native fauna in high elevation lakes (Knapp 1996;Eby et al 2006), but it may also allow for increased growth and survival of fish if food resources allow. Management of sport fisheries and conservation of native fauna in high elevation lakes would benefit from forecasts of the effects of changes to snowmelt, growing season length, and warming on energetics of cold-and coolwater fish species.…”

Section: Introductionmentioning

confidence: 99%

Combined effects of early snowmelt and climate warming on mountain lake temperatures and fish energetics

Christianson

Johnson

2020

Arctic, Antarctic, and Alpine Research

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Mountain regions are experiencing some of the highest air temperature increases and ice cover decreases. However, few studies have examined the effects of climate warming and earlier snowmelt on mountain lake thermal characteristics and energetic implications for fish. We assessed potential climate-induced thermal changes and energetic consequences for cutthroat trout (Oncorhynchus clarkii spp.) and brook trout (Salvelinus fontinalis) in the Southern Rocky Mountains, United States. We found that summer growing degree days increased by an average 21 percent with 2°C air warming and 43 percent with 5°C air warming. But earlier snowmelt increased growing degree days by an average 48 percent. The average maintenance ration with 2°C and 5°C warming increased respectively by 13.8 and 21.9 percent for cutthroat trout and 23.8 and 37.4 percent for brook trout. The average increase in food required with earlier snowmelt was 43.4 percent for cutthroat trout and 52.3 percent for brook trout. Thus, earlier snowmelt can have a greater effect on fish energy requirements than a 5°C rise in air temperatures. Snowmelt recession together with a 5°C air temperature rise could more than double food requirements for fish to maintain constant body weight. If lake productivity increases with these climatic changes, then trout growth could improve; otherwise, energetic demands may result in lower fish growth.

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Untitled

Cited by 171 publications

References 77 publications

Mind the gap – context dependency in invasive species impacts: a case study of the ascidian Ciona robusta

Mind the gap – context dependency in invasive species impacts: a case study of the ascidian Ciona robusta

What to do when invaders are out of control?

Combined effects of early snowmelt and climate warming on mountain lake temperatures and fish energetics

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