Functional response of fish communities in a multistressed freshwater world

Stefani, Fabrizio; Schiavon, Alfredo; Tirozzi, Pietro; Gomarasca, Stefano; Marziali, Laura

doi:10.1016/j.scitotenv.2020.139902

Cited by 21 publications

(15 citation statements)

References 97 publications

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“…In other cases, many data is available, although these have often been collected within projects with a specific purpose other than long-term monitoring [ 11 ]. Historical data collected in different years by different projects are surely a valuable but often overlooked source of information, available for the evaluation of the conservation status of species, communities, and ecosystems [ 12 , 13 , 14 , 15 ]. Beyond the assessment of population dynamic of each bird species, which is essential to define species-specific conservation priorities and actions, birds represent valuable ecological indicators that can potentially provide useful information about the overall biodiversity and ecosystem processes [ 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…Although species population trends are not directly informative on drivers of population changes [ 21 ], observing a common trend among species with similar ecological or life history traits can provide the foundation to test specific hypotheses about the drivers of the observed population dynamics [ 22 ]. Despite the arising attention of a trait-based approach in community ecology [ 15 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] and population ecology [ 30 , 31 , 32 , 33 , 34 ], only in the last few years researchers have started to explore the link between traits and population trends in avifauna over long time periods, highlighting the existence of different patterns among distinct functional groups [ 22 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

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Species Traits Drive Long-Term Population Trends of Common Breeding Birds in Northern Italy

Tirozzi

Orioli

Dondina

et al. 2021

Animals

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Long-term population trends are considerable sources of information to set wildlife conservation priorities and to evaluate the performance of management actions. In addition, trends observed in functional groups (e.g., trophic guilds) can provide the foundation to test specific hypotheses about the drivers of the observed population dynamics. The aims of this study were to assess population trends of breeding birds in Lombardy (N Italy) from 1992 to 2019 and to explore the relationships between trends and species sharing similar ecological and life history traits. Trends were quantified and tested for significance by weighted linear regression models and using yearly population indices (median and 95% confidence interval) predicted through generalized additive models. Results showed that 45% of the species increased, 24% decreased, and 31% showed non-significant trends. Life history traits analyses revealed a general decrease of migrants, of species with short incubation period and of species with high annual fecundity. Ecological traits analyses showed that plant-eaters and species feeding on invertebrates, farmland birds, and ground-nesters declined, while woodland birds increased. Further studies should focus on investigation of the relationship between long-term trends and species traits at large spatial scales, and on quantifying the effects of specific drivers across multiple functional groups.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Species Traits Drive Long-Term Population Trends of Common Breeding Birds in Northern Italy

Tirozzi

Orioli

Dondina

et al. 2021

Animals

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“…As reported in the literature for other areas, the detrimental impacts exerted by these four alien species could be amplified by the synergistic effect with additional anthropogenic stressors, including global warming [2,38,39]. Generally, the ability to persist of introduced species is influenced by their dispersal capacity, environmental tolerance, and food and habitat availability [19].…”

Section: Introductionmentioning

confidence: 83%

The Role of Climate Changes in the Spread of Freshwater Fishes: Implications for Alien Cool and Warm-Water Species in a Mediterranean Basin

Carosi

Ghetti²,

Lorenzoni

2021

Water

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In running waters, under climate change conditions, the combined effect of water warming and decreasing flow rates may encourage colonisation by invasive cool and warm-water fish species. The aim of the study was to analyze the potential climate change effects on the spread of four invasive alien fishes in the Tiber River basin, taking into account the effects of river fragmentation. Fish and environmental data collected in 91 sites over the years 1998–2018, were used to analyze temporal changes in their habitat requirements. A multivariate analysis was conducted, and the hypothesis of a range expansion towards the upstream reaches has been tested. For Barbus barbus, Gobio gobio, Padogobius bonelli and Pseudorasbora parva population abundances and body condition were analyzed. Detectability, occupancy, local extinction and colonization probabilities were estimated. We showed that B. barbus and P. bonelli have significantly extended their range toward upstream. P. parva did not move toward higher altitudes significantly, suggesting that, at this stage, the species has probably reached an equilibrium. River fragmentation, elevation, water temperature and average current speed seem to be major determinants in colonization processes, affecting the dispersal ability of the species. Not surprisingly for species introduced in relatively recent times, the colonization probabilities were much higher than extinction probabilities. Our results provided evidence for some synergistic effects between climate changes and alien fish species invasions, in terms of species range shifts mediated by rising water temperatures, although they should be interpreted cautiously, taking into account that these species most likely were not yet stabilized.

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“…Climate change causes increases in temperatures of freshwater bodies worldwide (Liu et al., 2020), which can have pronounced negative effects on fish communities. At its most severe, increasing temperatures cause the extripation of cold‐adapted species (Stefani et al., 2020). However, our data show that even less severe impacts of temperature changes alter the movement and physiology of fish.…”

Section: Discussionmentioning

confidence: 99%

“…For example, decreased water levels can decrease dissolved oxygen concentrations and increase water temperature, and increased discharge from dams and terrestrial run‐off may lead to altered temperature regimes (Liu et al., 2018, 2020). These environmental changes influence the physiology of aquatic organisms and may thereby modify ecological processes such as dispersal (Jung et al., 2020; Le Roy & Seebacher, 2018), and community structure (Stefani et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Water flow and temperature interact to determine oxidative status, swimming performance, and dispersal of mosquitofish (Gambusia holbrooki)

Seebacher

Kazerouni-Ghanizadeh

2021

Freshwater Biology

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The health of running freshwater systems depends to a large extent on flow rates, which can co‐vary with other environmental variables such as temperature. Water flow and temperature can influence oxidative status of individual animals, thereby impacting muscle function and locomotion. Consequently, ecologically important behaviours such as dispersal may be disrupted. Our aim was to determine whether the interactions between acclimation to flowing water (3 weeks at 0.06 m/s or still water), thermal acclimation (3 weeks at 18 and 28°C), and acute test temperatures (18–32°C) determine oxidative status, locomotor performance, and dispersal in mosquitofish (Gambusia holbrooki). We show that swimming capacity was greater in fish living in flowing water compared to those in still water, and that this difference was greater in warm acclimated fish. However, dispersal was not dependent on maximal locomotor capacities. Fish initiated dispersal to a greater extent when acclimated to flowing water and cool temperature, although there were interactions with acute test temperature. Dispersal speed was not affected by flow acclimation, but it was greater at cool test temperatures in cool acclimated fish, and vice versa for warm acclimated fish. Also, fish acclimated to flowing and cool water made a greater number of dispersal decisions. Oxidative damage to membranes and proteins did not change with flow or temperature treatments, but antioxidant capacities were greater in animals acclimated to flow and cool temperatures. Trait‐specific approaches used to assess fish responses to altered flow regimes typically consider a range of morphological and life‐history traits to characterise species and predict the impact of environmental change. Physiological traits and responses such as those we describe here can be a useful addition to life‐history traits in predicting the impact of environmental change on movement. Consideration of the impacts of physiological traits on dispersal can increase the efficacy of management and restoration projects.

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Functional response of fish communities in a multistressed freshwater world

Cited by 21 publications

References 97 publications

Species Traits Drive Long-Term Population Trends of Common Breeding Birds in Northern Italy

Species Traits Drive Long-Term Population Trends of Common Breeding Birds in Northern Italy

The Role of Climate Changes in the Spread of Freshwater Fishes: Implications for Alien Cool and Warm-Water Species in a Mediterranean Basin

Water flow and temperature interact to determine oxidative status, swimming performance, and dispersal of mosquitofish (Gambusia holbrooki)

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