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Jarvis L, Rosenfeld J, Gonzalez-Espinosa PC, Enders EC. A process framework for integrating stressor-response functions into cumulative effects models. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 906:167456. [PMID: 37839475 DOI: 10.1016/j.scitotenv.2023.167456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/24/2023] [Accepted: 09/27/2023] [Indexed: 10/17/2023]
Abstract
Stressor-response (SR) functions quantify ecological responses to natural environmental variation or anthropogenic stressors. They are also core drivers of cumulative effects (CE) models, which are increasingly recognized as essential management tools to grapple with the diffuse footprint of human impacts. Here, we provide a process framework for the identification, development, and integration of SR functions into CE models, and highlight their consequential properties, behaviour, criteria for selecting appropriate stressors and responses, and general approaches for deriving them. Management objectives (and causal effect pathways) will determine the ultimate stressor and target response variables of interest (i.e., individual growth/survival, population size, community structure, ecosystem processes), but data availability will constrain whether proxies need to be used for the target stressor or response variables. Available data and confidence in underlying mechanisms will determine whether empirical or mechanistic (theoretical) SR functions are optimal. Uncertainty in underlying SR functions is often the primary source of error in CE modelling, and monitoring outcomes through adaptive management to iteratively refine parameterization of SR functions is a key element of model application. Dealing with stressor interactions is an additional challenge, and in the absence of known or suspected interaction mechanisms, controlling main effects should remain the primary focus. Indicators of suspected interaction presence (i.e., much larger or smaller responses to stressor reduction than expected during monitoring) should be confirmed through adaptive management cycles or targeted stressor manipulations. Where possible, management decisions should selectively take advantage of interactions to strategically mitigate stressor impacts (i.e., by using antagonisms to suppress stressor impacts, and by using synergisms to efficiently reduce them).
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Affiliation(s)
- Lauren Jarvis
- Fisheries and Oceans Canada, Ontario & Prairie Region, Freshwater Institute, 501 University Avenue, Winnipeg, MB R3T 2N6, Canada.
| | - Jordan Rosenfeld
- UBC Institute for the Oceans and Fisheries, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada; B.C. Ministry of Environment, Vancouver, BC, Canada.
| | - Pedro C Gonzalez-Espinosa
- Nippon Foundation Ocean Nexus, Simon Fraser University, School of Resource and Environmental Management, Technology and Science Complex 1, 643A Science Rd, Burnaby, BC V5A 1S6, Canada
| | - Eva C Enders
- Institut National de la Recherche Scientifique, Eau Terre Environnement Research Centre, 490 de la Couronne Street, Quebec City, QC G1K 9A9, Canada.
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2
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Palmas F, Casula P, Curreli F, Podda C, Cabiddu S, Sabatini A. Exploring Less Invasive Visual Surveys to Assess the Spatial Distribution of Endangered Mediterranean Trout Population in a Small Intermittent Stream. BIOLOGY 2023; 12:1000. [PMID: 37508429 PMCID: PMC10376087 DOI: 10.3390/biology12071000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 07/05/2023] [Accepted: 07/12/2023] [Indexed: 07/30/2023]
Abstract
Monitoring the conservation status of endangered freshwater fish using less invasive methods poses challenges for ecologists and conservationists. Visual surveys have been proposed as an alternative to electrofishing, which is a standard methodology that can cause injuries, physiological stress and post-release mortality in organisms. To test the efficacy of visual methods, a study was conducted in an intermittent stream of Sardinia (Italy). Two visual methods were employed: a visual survey from streambanks (VSS) and an underwater visual survey (UVS) using cameras. The aims of this study were (1) to compare the effectiveness of these methods in detecting patch occupancy patterns and (2) to investigate the effect of environmental variables on the detection probability of Mediterranean native trout. Environmental variables characterizing pool habitats were recorded, and generalized linear models (GLMs) were employed to assess the correlation between these variables and trout presence/absence. GLM analysis revealed that UVS had higher detection probability with larger pool volume, whereas submerged macrophytes negatively affected detection probability. Detection from streambanks (VVS) was negatively affected by a high turbulence rate. In conclusion, our study suggests the utility of visual methods to describe patterns of patch occupancy of Mediterranean trout. However, methods can be differently affected by environmental variables. Therefore, monitoring programs using these methods should consider these factors to ensure a reliable description of within-stream trout distribution in intermittent streams.
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Affiliation(s)
- Francesco Palmas
- Department of Life and Environmental Sciences, University of Cagliari, Via Fiorelli 1, 09126 Cagliari, Italy
| | - Paolo Casula
- Agenzia Forestas, Servizio Tecnico, Viale Merello 86, 09124 Cagliari, Italy
| | - Francesco Curreli
- Agenzia Forestas, Servizio Tecnico, Viale Merello 86, 09124 Cagliari, Italy
| | - Cinzia Podda
- Department of Life and Environmental Sciences, University of Cagliari, Via Fiorelli 1, 09126 Cagliari, Italy
| | - Serenella Cabiddu
- Department of Life and Environmental Sciences, University of Cagliari, Via Fiorelli 1, 09126 Cagliari, Italy
| | - Andrea Sabatini
- Department of Life and Environmental Sciences, University of Cagliari, Via Fiorelli 1, 09126 Cagliari, Italy
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3
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Bjørnås KL, Railsback S, Piccolo J. Modifying and parameterizing the individual-based model inSTREAM for Atlantic salmon and brown trout in the regulated Gullspång River, Sweden. MethodsX 2023; 10:102243. [PMID: 37424766 PMCID: PMC10326503 DOI: 10.1016/j.mex.2023.102243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 06/02/2023] [Indexed: 07/11/2023] Open
Abstract
We modified, parameterized, and applied the individual-based model inSTREAM version 6.1 for lake-migrating populations of landlocked Atlantic salmon (Salmo salar) and brown trout (S. trutta) in a residual flow stretch of the hydropower-regulated Gullspång River, Sweden. This model description is structured according to the TRACE model description framework. Our aim was to model responses in salmonid recruitment to alternative scenarios of flow release and other environmental alterations. The main response variable was the number of large out-migrating juvenile fish per year, with the assumption that individuals are more inclined to out-migrate the larger they get, and that migration is an obligatory strategy. Population and species-specific parameters were set based on local electrofishing surveys, redd surveys, physical habitat surveys, broodstock data as well as scientific literature.•Simulations were set to run over 10 years, with sub-daily time steps, in this spatially and temporally explicit model.•Model calibration and validation of fish growth was done using data on juvenile fish from electrofishing.•The results were found to be sensitive to parameter values for aggregated fish, i.e., "superindividuals" and for the high temperature limit to spawning.
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Affiliation(s)
- Kristine Lund Bjørnås
- Department of Environmental and Life Sciences, River Ecology and Management Research Group (RivEM), Karlstad University, Sweden
- Norwegian Institute for Nature Research, Trondheim, Norway
| | - Steven Railsback
- Department of Mathematics, Cal Poly Humboldt and Lang, Railsback and Associates, California, USA
| | - John Piccolo
- Department of Environmental and Life Sciences, River Ecology and Management Research Group (RivEM), Karlstad University, Sweden
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4
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Gallagher BK, Geargeoura S, Fraser DJ. Effects of climate on salmonid productivity: A global meta-analysis across freshwater ecosystems. GLOBAL CHANGE BIOLOGY 2022; 28:7250-7269. [PMID: 36151941 PMCID: PMC9827867 DOI: 10.1111/gcb.16446] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 09/09/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
Salmonids are of immense socio-economic importance in much of the world, but are threatened by climate change. This has generated a substantial literature documenting the effects of climate variation on salmonid productivity in freshwater ecosystems, but there has been no global quantitative synthesis across studies. We conducted a systematic review and meta-analysis to gain quantitative insight into key factors shaping the effects of climate on salmonid productivity, ultimately collecting 1321 correlations from 156 studies, representing 23 species across 24 countries. Fisher's Z was used as the standardized effect size, and a series of weighted mixed-effects models were compared to identify covariates that best explained variation in effects. Patterns in climate effects were complex and were driven by spatial (latitude, elevation), temporal (time-period, age-class), and biological (range, habitat type, anadromy) variation within and among study populations. These trends were often consistent with predictions based on salmonid thermal tolerances. Namely, warming and decreased precipitation tended to reduce productivity when high temperatures challenged upper thermal limits, while opposite patterns were common when cold temperatures limited productivity. Overall, variable climate impacts on salmonids suggest that future declines in some locations may be counterbalanced by gains in others. In particular, we suggest that future warming should (1) increase salmonid productivity at high latitudes and elevations (especially >60° and >1500 m), (2) reduce productivity in populations experiencing hotter and dryer growing season conditions, (3) favor non-native over native salmonids, and (4) impact lentic populations less negatively than lotic ones. These patterns should help conservation and management organizations identify populations most vulnerable to climate change, which can then be prioritized for protective measures. Our framework enables broad inferences about future productivity that can inform decision-making under climate change for salmonids and other taxa, but more widespread, standardized, and hypothesis-driven research is needed to expand current knowledge.
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Affiliation(s)
| | - Sarah Geargeoura
- Department of BiologyConcordia UniversityMontrealQuebecCanada
- Present address:
Environment and Climate Change CanadaGatineauQuebecCanada
| | - Dylan J. Fraser
- Department of BiologyConcordia UniversityMontrealQuebecCanada
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5
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Lamarins A, Fririon V, Folio D, Vernier C, Daupagne L, Labonne J, Buoro M, Lefèvre F, Piou C, Oddou‐Muratorio S. Importance of interindividual interactions in eco-evolutionary population dynamics: The rise of demo-genetic agent-based models. Evol Appl 2022; 15:1988-2001. [PMID: 36540635 PMCID: PMC9753837 DOI: 10.1111/eva.13508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 10/26/2022] [Accepted: 10/28/2022] [Indexed: 11/29/2022] Open
Abstract
The study of eco-evolutionary dynamics, that is of the intertwinning between ecological and evolutionary processes when they occur at comparable time scales, is of growing interest in the current context of global change. However, many eco-evolutionary studies overlook the role of interindividual interactions, which are hard to predict and yet central to selective values. Here, we aimed at putting forward models that simulate interindividual interactions in an eco-evolutionary framework: the demo-genetic agent-based models (DG-ABMs). Being demo-genetic, DG-ABMs consider the feedback loop between ecological and evolutionary processes. Being agent-based, DG-ABMs follow populations of interacting individuals with sets of traits that vary among the individuals. We argue that the ability of DG-ABMs to take into account the genetic heterogeneity-that affects individual decisions/traits related to local and instantaneous conditions-differentiates them from analytical models, another type of model largely used by evolutionary biologists to investigate eco-evolutionary feedback loops. Based on the review of studies employing DG-ABMs and explicitly or implicitly accounting for competitive, cooperative or reproductive interactions, we illustrate that DG-ABMs are particularly relevant for the exploration of fundamental, yet pressing, questions in evolutionary ecology across various levels of organization. By jointly modelling the effects of management practices and other eco-evolutionary processes on interindividual interactions and population dynamics, DG-ABMs are also effective prospective and decision support tools to evaluate the short- and long-term evolutionary costs and benefits of management strategies and to assess potential trade-offs. Finally, we provide a list of the recent practical advances of the ABM community that should facilitate the development of DG-ABMs.
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Affiliation(s)
- Amaïa Lamarins
- E2S UPPA, INRAE, ECOBIOPUniversité de Pau et des Pays de l'AdourSaint‐Pée‐sur‐NivelleFrance,Management of Diadromous Fish in their Environment, OFB, INRAE, Institut AgroUniv Pau & Pays Adour/E2S UPPARennesFrance
| | - Victor Fririon
- INRAE, UR 629 Ecologie des Forêts Méditerranéennes, URFMAvignonFrance
| | - Dorinda Folio
- E2S UPPA, INRAE, ECOBIOPUniversité de Pau et des Pays de l'AdourSaint‐Pée‐sur‐NivelleFrance
| | - Camille Vernier
- CIRAD, UMR CBGP, INRAE, IRD, Montpellier SupAgroUniv. MontpellierMontpellierFrance
| | - Léa Daupagne
- E2S UPPA, INRAE, ECOBIOPUniversité de Pau et des Pays de l'AdourSaint‐Pée‐sur‐NivelleFrance
| | - Jacques Labonne
- E2S UPPA, INRAE, ECOBIOPUniversité de Pau et des Pays de l'AdourSaint‐Pée‐sur‐NivelleFrance
| | - Mathieu Buoro
- E2S UPPA, INRAE, ECOBIOPUniversité de Pau et des Pays de l'AdourSaint‐Pée‐sur‐NivelleFrance
| | - François Lefèvre
- INRAE, UR 629 Ecologie des Forêts Méditerranéennes, URFMAvignonFrance
| | - Cyril Piou
- CIRAD, UMR CBGP, INRAE, IRD, Montpellier SupAgroUniv. MontpellierMontpellierFrance
| | - Sylvie Oddou‐Muratorio
- E2S UPPA, INRAE, ECOBIOPUniversité de Pau et des Pays de l'AdourSaint‐Pée‐sur‐NivelleFrance
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6
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Al-Chokhachy R, Peka R, Horgen E, Kaus DJ, Loux T, Heki L. Water availability drives instream conditions and life-history of an imperiled desert fish: A case study to inform water management. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 832:154614. [PMID: 35358530 DOI: 10.1016/j.scitotenv.2022.154614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 03/09/2022] [Accepted: 03/12/2022] [Indexed: 06/14/2023]
Abstract
In arid ecosystems, available water is a critical, yet limited resource for human consumption, agricultural use, and ecosystem processes-highlighting the importance of developing management strategies to meet the needs of multiple users. Here, we evaluated how water availability influences stream thermal regimes and life-history expressions of Lahontan cutthroat trout (Oncorhynchus clarkii henshawi) in the arid Truckee River basin in the western United States. We integrated air temperature and stream discharge data to quantify how water availability drives stream temperature during annual spawning and rearing of Lahontan cutthroat trout. We then determined how in situ stream discharge and temperature affected adult spawning migrations, juvenile growth opportunities, and duration of suitable thermal conditions. Air temperatures had significant, large effects (+) on stream temperature across months; the effects of discharge varied across months, with significant effects (-) during May through August, suggesting increased discharge can help mitigate temperatures during seasonally warm months. Two models explained adult Lahontan cutthroat trout migration, and both models indicated that adult Lahontan cutthroat trout avoid migration when temperatures are warmer (~ > 12 °C) and discharge is higher (~ > 50 m3*s-1). Juvenile size was best explained by a quadratic relationship with cumulative degree days (CDD; days>4 °C) as size increased with increasing CDDs but decreased at higher CDDs. We also found an interaction between CDDs and discharge explaining juvenile size: when CDDs were low, higher discharge was associated with larger size, but when CDDs were high, higher discharge was associated with smaller size. Stream temperatures also determined the duration of juvenile rearing, as all juvenile emigration ceased at temperatures >24.4 °C. Together, our results illustrated how stream discharge and temperature shape the life-history of Lahontan cutthroat trout at multiple stages and can inform management actions to offset warming temperatures and facilitate life-history diversity and population resilience.
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Affiliation(s)
- Robert Al-Chokhachy
- U.S. Geological Survey, Northern Rocky Mountain Science Center, 2327 University Way, Suite 2, Bozeman, MT 59715, USA.
| | - Roger Peka
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Erik Horgen
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Daniel J Kaus
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Tim Loux
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Lisa Heki
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
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7
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National-Scale Assessment of Climate Change Impacts on Two Native Freshwater Fish Using a Habitat Suitability Model. WATER 2022. [DOI: 10.3390/w14111825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Climate change, which has the potential to alter water flow and temperature in aquatic environments, can influence the freshwater fish habitat. This study used an ecological habitat suitability model (EHSM), which integrates hydraulic (water depth and velocity) and physiologic (water temperature) suitability, to investigate the impact of climate change on two native freshwater fish species (Zacco platypus and Nipponocypris koreanus) in South Korea. The model predicted that in 2080 (2076–2085), the decrease in average ecological habitat suitability (EHS) will be higher for N. koreanus (19.2%) than for Z. platypus (9.87%) under the representative concentration pathway (RCP) 8.5 scenario. Under the same condition, EHS for Z. platypus and N. koreanus at 36.5% and 44.4% of 115 sites, respectively, were expected to degrade significantly (p < 0.05). However, the habitat degradation for Z. platypus and N. koreanus was much lower (7.8% and 10.4%, respectively) under the RCP 4.5 scenario, suggesting a preventive measure for carbon dioxide emission. Partial correlation analysis indicated that the number of hot days (i.e., days on which the temperature exceeds the heat stress threshold) is the variable most significantly (p < 0.05) related to EHS changes for both species. This study suggests that the EHSM incorporating the effect of water temperature on the growth and heat stress of fish can be a promising model for the assessment of climate change impacts on habitat suitability for freshwater fish.
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8
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Conservation Genetics of Mediterranean Brown Trout in Central Italy (Latium): A Multi-Marker Approach. WATER 2022. [DOI: 10.3390/w14060937] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Brown trout is considered a complex of incipient species, including several phylogenetic lineages, whose natural distribution in the Mediterranean area has been altered, since the beginning of the 1900s, by massive introductions of domestic strains of Atlantic origin to support fisheries. Introduced trout naturalize in new suitable environments and extensively hybridize with native populations. Here, we characterized putatively neutral and adaptive genetic variability and population structure of Mediterranean brown trout from six river catchments in central peninsular Italy, as revealed by both mitochondrial (Control Region) and nuclear (microsatellites, LDH-C1, major histocompatibility complex) markers. We quantified the admixture of wild populations with hatchery strains and evaluated the effects of domestic trout introductions on shaping population genetics. Our analyses indicated: (1) a composite picture of genetic variability in the area, with the presence of all native Mediterranean trout mitochondrial lineages (“Adriatic”, “Mediterranean”, “marmoratus”), various frequencies of allochthonous genotypes and different rates of introgression among sampling sites; (2) asymmetric mito-nuclear introgression; (3) increasing nuclear marker diversity with increasing levels of admixture across populations; (4) strong population structure coupled with relatively low effective population size. Data allowed the identification of five management units and we propose specific actions to support ongoing and future conservation strategies within the examined area.
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9
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Bærum KM, Finstad AG, Ulvan EM, Haugen TO. Population consequences of climate change through effects on functional traits of lentic brown trout in the sub-Arctic. Sci Rep 2021; 11:15246. [PMID: 34315914 PMCID: PMC8316365 DOI: 10.1038/s41598-021-94350-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 06/29/2021] [Indexed: 11/16/2022] Open
Abstract
Climate-induced plasticity in functional traits has received recent attention due to the immense importance phenotypic variation plays in population level responses. Here, we explore the effect of different climate-change scenarios on lentic populations of a freshwater ectotherm, the brown trout (Salmo trutta L.), through climate effects on functional traits. We first parameterize models of climate variables on growth, spawning probability and fecundity. The models are utilized to inform a dynamic age-structured projection matrix, enabling long-term population viability projections under climate and population density variation. Ambient temperature and winter conditions had a substantial effect on population growth rate. In general, warmer summer temperatures resulted in faster growth rates for young fish but ended in smaller size at age as fish got older. Increasing summer temperatures also induced maturation at younger age and smaller size. In addition, we found effects of first-year growth on later growth trajectories for a fish, indicating that environmental conditions experienced the first year will also influence size at age later in life. At the population level, increasing temperatures average (up to 4 °C increase in areas with mean summer temperature at approximately 12 °C) resulted in a positive effect on population growth rate (i.e. smaller but more fish) during climate simulations including increasing and more variable temperatures.
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Affiliation(s)
- Kim Magnus Bærum
- Norwegian Institute for Nature Research, Fakkelgården, 2624, Lillehammer, Norway.
| | - Anders G Finstad
- Department of Natural History, Centre for Biodiversity Dynamics, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Eva Marita Ulvan
- Norwegian Institute for Nature Research, 7485, Trondheim, Norway
| | - Thrond O Haugen
- Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, P. O. Box 5003, NO-1432, Aas, Norway
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10
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Arevalo E, Lassalle G, Tétard S, Maire A, Sauquet E, Lambert P, Paumier A, Villeneuve B, Drouineau H. An innovative bivariate approach to detect joint temporal trends in environmental conditions: Application to large French rivers and diadromous fish. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 748:141260. [PMID: 32805565 DOI: 10.1016/j.scitotenv.2020.141260] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 07/22/2020] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
Most key life-events of organisms are synchronized by complex interactions of several environmental cues to ensure optimal survival and growth of individuals and their offspring. However, global change is known to affect multiple components of ecosystems and cues at the same time. Therefore, detecting joint trends in covariate time series is a crucial challenge in global change ecology that has rarely been addressed so far. In this context, we designed an innovative combination of kernel density estimations and Mann-Kendall trend tests to detect joint temporal trends in a pair of environmental variables. This methodological framework was tested on >30 years (1976-2019) of water temperature and discharge data for 6 large French rivers (the Garonne, Dordogne, Rhône, Rhine, Loire and Vienne rivers). The implications of such trends in both temperature and discharge for diadromous species key life-cycle processes were then explored by checking if significant bivariate environmental changes occurred during seasons of upstream and downstream migration, and reproductive activities. Results were contrasted between rivers and seasons: many rivers displayed an increase in the number of days with high water temperature and low river discharge, but local discharge regulation measures could have mitigated the trend in discharge. Our findings showed that species migrating or spawning in spring were likely to be strongly impacted by the new environmental conditions in the Garonne, Loire and Rhône rivers, given the marked changes in water temperature and discharge associations detected by our new method. Conditions experienced by fall-running and spawning species have been strongly affected in all the rivers studied. This innovative methodology was implemented in a new R package, ChocR, for application to other environments and ecosystems.
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Affiliation(s)
- Elorri Arevalo
- INRAE, Unité EABX - Écosystèmes Aquatiques et Changements Globaux, HYNES (Irstea-EDF R&D), 50 avenue de Verdun, 33612 Cestas Cedex, France.
| | - Géraldine Lassalle
- INRAE, Unité EABX - Écosystèmes Aquatiques et Changements Globaux, HYNES (Irstea-EDF R&D), 50 avenue de Verdun, 33612 Cestas Cedex, France
| | - Stéphane Tétard
- EDF R&D LNHE - Laboratoire National d'Hydraulique et Environnement, HYNES (Irstea-EDF R&D), 6 quai Watier, 78401 Chatou Cedex, France
| | - Anthony Maire
- EDF R&D LNHE - Laboratoire National d'Hydraulique et Environnement, HYNES (Irstea-EDF R&D), 6 quai Watier, 78401 Chatou Cedex, France
| | - Eric Sauquet
- INRAE, Unité RiverLy, 5 Rue de la Doua CS20244, 69625 Villeurbanne Cedex, France
| | - Patrick Lambert
- INRAE, Unité EABX - Écosystèmes Aquatiques et Changements Globaux, HYNES (Irstea-EDF R&D), 50 avenue de Verdun, 33612 Cestas Cedex, France
| | - Alexis Paumier
- INRAE, Unité EABX - Écosystèmes Aquatiques et Changements Globaux, HYNES (Irstea-EDF R&D), 50 avenue de Verdun, 33612 Cestas Cedex, France
| | - Bertrand Villeneuve
- INRAE, Unité EABX - Écosystèmes Aquatiques et Changements Globaux, HYNES (Irstea-EDF R&D), 50 avenue de Verdun, 33612 Cestas Cedex, France
| | - Hilaire Drouineau
- INRAE, Unité EABX - Écosystèmes Aquatiques et Changements Globaux, HYNES (Irstea-EDF R&D), 50 avenue de Verdun, 33612 Cestas Cedex, France
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11
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Ayllón D, Nicola GG, Elvira B, Almodóvar A. Climate change will render size‐selective harvest of cold‐water fish species unsustainable in Mediterranean freshwaters. J Appl Ecol 2020. [DOI: 10.1111/1365-2664.13805] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Daniel Ayllón
- Faculty of Biology Department of Biodiversity, Ecology and Evolution Complutense University of Madrid (UCM) Madrid Spain
| | - Graciela G. Nicola
- Department of Environmental Sciences University of Castilla‐La Mancha (UCLM) Toledo Spain
| | - Benigno Elvira
- Faculty of Biology Department of Biodiversity, Ecology and Evolution Complutense University of Madrid (UCM) Madrid Spain
| | - Ana Almodóvar
- Faculty of Biology Department of Biodiversity, Ecology and Evolution Complutense University of Madrid (UCM) Madrid Spain
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12
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Carosi A, Ghetti L, Padula R, Lorenzoni M. Population status and ecology of the Salmo trutta complex in an Italian river basin under multiple anthropogenic pressures. Ecol Evol 2020; 10:7320-7333. [PMID: 32760531 PMCID: PMC7391546 DOI: 10.1002/ece3.6457] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 05/10/2020] [Accepted: 05/13/2020] [Indexed: 12/23/2022] Open
Abstract
Salmonids inhabiting Mediterranean rivers are of particular concern for biodiversity conservation, as they are threatened by various stressors, including habitat alterations, overfishing, climate change, and introgressive hybridization with alien species. In the Tiber River basin (Central Italy), genetic introgression phenomena of the native Salmo cettii with the non-native Salmo trutta hinder the separate analysis of the two species, which are both included in the S. trutta complex. Little is known about the factors currently limiting the trout populations in this area, particularly with respect to climate change. With the intention of filling this gap, the aims of the current study were to (a) quantify changes in the climate and (b) analyze the distribution, status, and ecology of trout populations, in the context of changing abiotic conditions over the last decades. Fish stock assessments were carried out by electrofishing during three census periods (1998-2004, 2005-2011, and 2012-2018) at 129 sites. The trend over time of meteorological parameters provided evidence for increased air temperature and decreased rainfall. Multivariate analysis of trout densities and environmental data highlighted the close direct correlation of trout abundance with water quality, altitude, and current speed. Climate-induced effects observed over time in the sites where trout were sampled have not yet led to local extinctions or distribution shifts, indicating a marked resilience of trout, probably due to the buffering effect of intrinsic population dynamics. Decreasing body conditions over time and unbalanced age structures support the hypothesis that variations in hydraulic regime and water temperature could overcome these compensatory effects, which may lead to a severe decline in trout populations in the near future. In a climate change context, habitat availability plays a key role in the distribution of cold-water species, which often do not have the possibility to move upstream to reach their thermal optimum because of water scarcity in the upper river stretches.
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Affiliation(s)
- Antonella Carosi
- Department of Chemistry, Biology, and BiotechnologiesUniversity of PerugiaPerugiaItaly
| | - Lucia Ghetti
- Forest, Economics, and Mountain Territory ServicePerugiaItaly
| | - Rosalba Padula
- Centre for Climate Change and Biodiversity in Lakes and Wetlands of Arpa UmbriaPerugiaItaly
| | - Massimo Lorenzoni
- Department of Chemistry, Biology, and BiotechnologiesUniversity of PerugiaPerugiaItaly
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Gervais JA, Kovach R, Sepulveda A, Al-Chokhachy R, Joseph Giersch J, Muhlfeld CC. Climate-induced expansions of invasive species in the Pacific Northwest, North America: a synthesis of observations and projections. Biol Invasions 2020. [DOI: 10.1007/s10530-020-02244-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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