Landscape resistance mediates native fish species distribution shifts and vulnerability to climate change in riverscapes

LeMoine, Michael T.; Eby, Lisa A.; Clancy, Chris; Nyce, Leslie G.; Jakober, Michael J.; Isaak, Dan

doi:10.1111/gcb.15281

Cited by 37 publications

(38 citation statements)

References 115 publications

(184 reference statements)

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“…The vulnerability of biodiversity is defined in several terms (Mendoza‐Ponce et al., 2020 ): (a) Exposure is defined as the degree, duration, and extent to which a system or a part of it is in contact with harm; (b) sensitivity is recognized as the susceptibility of an element to be harmed; (c) adaptive capacity refers to the ability to adjust to current or future conditions (IPCC, 2014 ; Mendoza‐Ponce et al., 2020 ). Mostly, the vulnerability is measured by habitat loss or fragmentation under climate change, land‐cover/use‐change, species invasion, and other anthropogenic interference (LeMoine et al., 2020 ; Maerz et al., 2019 ; Penaluna et al., 2015 ). Another direct metrics is to measure the impact of species loss (Chua et al., 2019 ; Pool et al., 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Fish taxonomic, functional, and phylogenetic diversity and their vulnerabilities in the largest river in southeastern China

Deng

Huang

et al. 2021

Ecology and Evolution

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Section: Introductionmentioning

confidence: 99%

Fish taxonomic, functional, and phylogenetic diversity and their vulnerabilities in the largest river in southeastern China

Deng

Huang

et al. 2021

Ecology and Evolution

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“…Globally, warming of thermal landscapes are a direct product of climate change [15][16][17]. Across the United States, projections show nearly 50% of cold-water habitat could be lost due to climate change [8,18], though this decline varies widely depending on species, their thermal constraints, and landscape resistance to dispersal [18]. These changes are compounded by the regulation effects of dams.…”

Section: Introductionmentioning

confidence: 99%

Classifying California’s stream thermal regimes for cold-water conservation

2021

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Stream temperature science and management is rapidly shifting from single-metric driven approaches to multi-metric, thermal regime characterizations of streamscapes. Given considerable investments in recovery of cold-water fisheries (e.g., Pacific salmon and other declining native species), understanding where cold water is likely to persist, and how cold-water thermal regimes vary, is critical for conservation. California’s unique position at the southern end of cold-water ecosystems in the northern hemisphere, variable geography and hydrology, and extensive flow regulation requires a systematic approach to thermal regime classification. We used publicly available, long-term (> 8 years) stream temperature data from 77 sites across California to model their thermal regimes, calculate three temperature metrics, and use the metrics to classify each regime with an agglomerative nesting algorithm. Then, we assessed the variation in each class and considered underlying physical or anthropogenic factors that could explain differences between classes. Finally, we considered how different classes might fit existing criteria for cool- or cold-water thermal regimes, and how those differences complicate efforts to manage stream temperature through regulation. Our results demonstrate that cool- and cold-water thermal regimes vary spatially across California. Several salient findings emerge from this study. Groundwater-dominated streams are a ubiquitous, but as yet, poorly explored class of thermal regimes. Further, flow regulation below dams imposes serial discontinuities, including artificial thermal regimes on downstream ecosystems. Finally, and contrary to what is often assumed, California reservoirs do not contain sufficient cold-water storage to replicate desirable, reach-scale thermal regimes. While barriers to cold-water conservation are considerable and the trajectory of cold-water species towards extinction is dire, protecting reaches that demonstrate resilience to climate warming remains worthwhile.

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“…These studies show a range of changes in species distribution and life histories, but they also show some circumstances where global change has not entailed a corresponding change in ecology, at least for some species (e.g. Matsuda et al, 2018, Lavery et al, 2020, LeMoine et al, 2020, this study, Table 2). It may be difficult to accurately predict the outcome of global change impacts on species, as not all species responded as predicted.…”

Section: Ta B L Ementioning

confidence: 57%

Flow regime change alters shredder identity but not leaf litter decomposition in headwater streams affected by severe, permanent drying

2021

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Climate change is altering hydrologic regimes globally. In the Mediterranean climate region of south‐western Australia (SWA), climate drying has caused many perennial streams to switch to intermittent flow regimes. Shifts in flow regime are expected to alter physical and biological processes in streams, including litter decomposition, which is the basis of detrital food webs. Decomposition of jarrah (Eucalyptus marginata) leaves and associated macroinvertebrates, were measured over 320 days in 2018–19 using leaf bags in four headwater streams in SWA. Two streams retained perennial reaches and two were formerly perennial streams that are now intermittent. Pre‐planned comparisons that formed a partial multiple before–after, control–impact design were used to compare the results to an experiment conducted in 1982–83 in some of the same streams when all were perennially flowing. Both experiments used coarse and fine‐mesh bags containing 10 g of dry leaves. In one perennial stream, coarse bags lost more weight than fine bags at the last sampling time only, when shredding caddisflies arrived on the leaf bags. In the other perennial stream, leaf‐mining chironomids entered fine‐mesh bags and accelerated decomposition so that they lost more weight than the coarse‐mesh bags. There was no difference in weight loss between fine and coarse‐mesh leaf bags in the two intermittent streams. In 2018–19, decomposition was slower in dry reaches of intermittent streams than in perennial reaches. Leaf weight loss increased with the resumption of flow in intermittent streams, so that by the end of the experiment, similar amounts of leaf weight had been lost in intermittent and perennial reaches. Thus, although the temporal pattern of decomposition differed between intermittent and perennial reaches, after 320 days, they had reached a similar endpoint. Over similar experimental duration, mean leaf weight remaining in perennial reaches at the end of the experiment did not differ between the 1982–83 study and 2018–19, showing that leaf decomposition had not changed in reaches that retained perennial flow. As mean leaf weight remaining also did not differ between intermittent and perennial streams in 2018–19, leaf decomposition was robust to flow regime change. However, since 1982–83, these streams have lost populations of shredding caddisflies and stoneflies, which were replaced by other shredders (e.g. leaf mining chironomids Stenochironomus sp.), showing that there was some redundancy amongst shredder species. As climate change progresses, drying flow regimes will become commonplace in Mediterranean (and other) climate regions globally. This study indicates that litter decomposition may be maintained as streams transition to intermittency although shredder species may change. However, the impact of shredding species on leaf decomposition varies amongst studies, so effects of the loss of shredder species sensitive to drying may also vary, and in some cases their loss may substantially alter ecosystem processes.

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Landscape resistance mediates native fish species distribution shifts and vulnerability to climate change in riverscapes

Cited by 37 publications

References 115 publications

Fish taxonomic, functional, and phylogenetic diversity and their vulnerabilities in the largest river in southeastern China

Fish taxonomic, functional, and phylogenetic diversity and their vulnerabilities in the largest river in southeastern China

Classifying California’s stream thermal regimes for cold-water conservation

Flow regime change alters shredder identity but not leaf litter decomposition in headwater streams affected by severe, permanent drying

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