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Eerola ES, Megyeri E, Piro AJ, Hayden B, Kahilainen KK. Year-round sampling of the fish community in a boreal lake: differences between summer and winter influence estimates of species composition, catch, and fish size. JOURNAL OF FISH BIOLOGY 2024. [PMID: 39030840 DOI: 10.1111/jfb.15865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 06/22/2024] [Accepted: 06/22/2024] [Indexed: 07/22/2024]
Abstract
Boreal lakes experience pronounced seasonal variation in abiotic factors, especially light, temperature, and oxygen. A deep boreal humic lake was sampled year-round to test putative changes in total fish catch, species composition, catch-per-unit-effort (CPUE), habitat use, fish size, and condition. Monthly sampling was conducted in Lake Pääjärvi, southern Finland, during one full year in 2020-2021 as well as in March and August 2021 and 2022. The fish community was dominated by cyprinid species in all months, but the percentage of percid fish caught increased during the warm summer period. Most fish were caught in littoral habitats and the highest catches occurred in summer, but some species (e.g., ruffe, Gymnocephalus cernua, and pikeperch, Sander lucioperca) remained abundant in the winter catch. The body size of fish was larger in the winter catch, while condition factor was higher in summer for most species. Fish species proportions in total catch, CPUE, and average size of fish were closest to the annual mean values in September, which may be used as the optimal period to monitor fish communities of similar deep boreal lakes. Our findings highlight the need for year-round research to reveal the impacts of rising temperatures and diminishing ice-covered periods in fish communities and lake food webs.
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Affiliation(s)
- Emmi S Eerola
- Lammi Biological Station, University of Helsinki, Lammi, Finland
| | - Eszter Megyeri
- Lammi Biological Station, University of Helsinki, Lammi, Finland
| | - Alexander J Piro
- Lammi Biological Station, University of Helsinki, Lammi, Finland
| | - Brian Hayden
- Biology Department, Canadian Rivers Institute, University of New Brunswick, Fredericton, New Brunswick, Canada
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2
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Climate-related drivers of nutrient inputs and food web structure in shallow Arctic lake ecosystems. Sci Rep 2022; 12:2125. [PMID: 35136177 PMCID: PMC8825857 DOI: 10.1038/s41598-022-06136-4] [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: 09/13/2021] [Accepted: 01/12/2022] [Indexed: 11/08/2022] Open
Abstract
In order to predict the effects of climate change on polar ecosystems, disentangling mechanisms of nutrient transfer in food webs is crucial. We investigated sources of nutrients in tundra lakes, tracing their transfer through the food web and relating the observed patterns to runoff, snow coverage, and the presence of migratory geese in lake catchments. C and N content (elemental and isotopic) of several food web components including Lepidurus arcticus (Notostraca, at the top of the lake food webs) in 18 shallow Arctic lakes was compared. Terrestrial productivity and geese abundance were key biotic factors that interacted with abiotic variables (snow coverage, lake and catchment size) in determining the amount and origin of nutrient inputs, affecting the trophic interactions among aquatic species, food chain length and nutrient flow in Arctic lake food webs. Decreasing snow coverage, increasing abundance and expansion of the geese's range are expected across the Arctic due to climate warming. By relating nutrient inputs and food web structure to snow coverage, vegetation and geese, this study contributes to our mechanistic understanding of the cascade effects of climate change in tundra ecosystems, and may help predict the response of lakes to changes in nutrient inputs at lower latitudes.
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3
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DePasquale AN, Webb SE, Williamson RE, Fedigan LM, Melin AD. Testing the niche differentiation hypothesis in wild capuchin monkeys with polymorphic color vision. Behav Ecol 2021. [DOI: 10.1093/beheco/arab001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
The polymorphic color vision system present in most North, Central, and South American monkeys is a textbook case of balancing selection, yet the mechanism behind it remains poorly understood. Previous work has established task-specific foraging advantages to different color vision phenotypes: dichromats (red-green colorblind) are more efficient foraging for invertebrates, while trichromats (color “normal” relative to humans) are more efficient foraging for “reddish” ripe fruit, suggesting that niche differentiation may underlie the maintenance of color vision variation. We explore a prediction of the niche differentiation hypothesis by asking whether dichromatic and trichromatic capuchin monkeys (Cebus imitator) diverge in their foraging activity budget, specifically testing whether dichromats forage more frequently for invertebrates and trichromats forage more frequently for “reddish” ripe fruit. To assess this, we analyze a large data set of behavioral scan samples (n = 21 984) from 48 wild adult female capuchins of known color vision genotype, dominance rank, and reproductive status, together with models of food conspicuity. We find no significant differences between dichromats and trichromats in the frequency of scans spent foraging for different food types but do find that nursing females forage less overall than cycling females. Our results suggest that the potential for color-vision-based niche differentiation in foraging time may be curtailed by the energetic requirements of reproduction, behavioral synchrony caused by group living, and/or individual preferences. While niche differentiation in activity budgets by color vision type is not apparent, fine-scale niche differentiation may be occurring. This research enhances our understanding of the evolutionary processes maintaining sensory polymorphisms.
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Affiliation(s)
- Allegra N DePasquale
- Department of Anthropology and Archaeology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
| | - Shasta E Webb
- Department of Anthropology and Archaeology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
| | - Rachel E Williamson
- Department of Anthropology and Archaeology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
| | - Linda M Fedigan
- Department of Anthropology and Archaeology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
| | - Amanda D Melin
- Department of Anthropology and Archaeology, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, Canada
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary, 3330 Hospital Dr NW, Calgary, AB T2N 4N1, Canada
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4
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Scharnweber K. Morphological and trophic divergence of lake and stream minnows ( Phoxinus phoxinus). Ecol Evol 2020; 10:8358-8367. [PMID: 32788985 PMCID: PMC7417209 DOI: 10.1002/ece3.6543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 06/06/2020] [Accepted: 06/10/2020] [Indexed: 11/09/2022] Open
Abstract
Phenotypic divergence in response to divergent natural selection between environments is a common phenomenon in species of freshwater fishes. Intraspecific differentiation is often pronounced between individuals inhabiting lakes versus stream habitats. The different hydrodynamic regimes in the contrasting habitats may promote a variation of body shape, but this could be intertwined with morphological adaptations to a specific foraging mode. Herein, I studied the divergence pattern of the European minnow (Phoxinus phoxinus), a common freshwater fish that has received little attention despite its large distribution. In many Scandinavian mountain lakes, European minnows are considered as being invasive and were found to pose threats to the native fish populations due to resource competition. Minnows were recently found to show phenotypic adaptations in lake versus stream habitats, but the question remained if this divergence pattern is related to differences in resource use. I therefore studied the patterns of minnow divergence in morphology (i.e., using geometric morphometrics) and trophic niches (i.e., using stomach content analyses) in the lake Ånnsjön and its tributaries to link the changes in body morphology to the feeding on specific resources. Lake minnows showed a strong reliance on benthic Cladocera and a more streamlined body shape with a more upward facing snout, whereas stream minnows fed on macroinvertebrates (larvae and adults) to a higher degree and had a deeper body with a snout that was pointed down. Correlations showed a significant relationship of the proportion of macroinvertebrates in the gut and morphological features present in the stream minnows. The results of this study highlight the habitat-specific divergence pattern in morphology and resource use in this ubiquitous freshwater fish. Consequently, interspecific interactions of invasive minnows and the native fish population could differ in the respective food webs and resource competition could target different native fish species in the contrasting habitats.
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Affiliation(s)
- Kristin Scharnweber
- Department of Ecology and Genetics – LimnologyUppsala UniversityUppsalaSweden
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5
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Neerland ED, Bytingsvik J, Nikiforov VA, Evenset A, Krøkje Å. DNA Double-Strand Breaks in Arctic Char (Salvelinus alpinus) from Bjørnøya in the Norwegian Arctic. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2019; 38:2405-2413. [PMID: 31343779 DOI: 10.1002/etc.4546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 05/13/2019] [Accepted: 07/19/2019] [Indexed: 06/10/2023]
Abstract
High levels of organochlorine contaminants (OCs) have been found in arctic char (Salvelinus alpinus) from Lake Ellasjøen, Bjørnøya (Norwegian Arctic). The aim of the present study was to investigate the potential genotoxic effect of environmental organochlorine contaminant exposure in arctic char from Ellasjøen compared with arctic char from the low-contaminated Lake Laksvatn nearby. Blood was analyzed using agarose gel electrophoresis and image data analysis to quantify the fraction of total DNA that migrated into the gel (DNA-FTM) as a relative measure of DNA double-strand breaks (DSBs). Analysis by GC-MS of muscle samples showed an average 43 times higher concentration of ΣOCs in arctic char from Ellasjøen (n = 18) compared with Laksvatn char (n = 21). Char from Lake Ellasjøen had a much higher frequency of DSBs, as measured by DNA-FTM, than char from Lake Laksvatn. Principal component analysis and multiple linear regressions show that there was a significant positive relationship between DSBs and levels of organochlorine contaminants in the char. In addition, DSBs were less frequent in reproductively mature char than in immature char. The results suggest that organochlorine contaminants are genotoxic to arctic char. Environ Toxicol Chem 2019;38:2405-2413. © 2019 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals, Inc. on behalf of SETAC.
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Affiliation(s)
- Eirik D Neerland
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Jenny Bytingsvik
- Akvaplan-niva AS, Fram Centre-High North Research Centre for Climate and the Environment, Tromsø, Norway
| | - Vladimir A Nikiforov
- Norwegian Institute for Air Research, Fram Centre-High North Research Centre for Climate and the Environment, Tromsø, Norway
| | - Anita Evenset
- Akvaplan-niva AS, Fram Centre-High North Research Centre for Climate and the Environment, Tromsø, Norway
- The Arctic University of Norway, Tromsø, Norway
| | - Åse Krøkje
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
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6
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Krepski T, Czerniawski R. Can we teach a fish how to eat? The impact of bottom and surface feeding on survival and growth of hatchery-reared sea trout parr (Salmo trutta trutta L.) in the wild. PLoS One 2019; 14:e0222182. [PMID: 31491026 PMCID: PMC6730929 DOI: 10.1371/journal.pone.0222182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 08/23/2019] [Indexed: 11/18/2022] Open
Abstract
In this study we attempted to determine the effect of various feeding methods (bottom and surface feeding) used in the hatchery, on the survival and growth rates of hatchery-reared sea trout (Salmo trutta trutta L.) in the wild. Rearing was performed in two variants: a bottom-fed group (BFG) and a surface-fed group (SFG). At the end of the rearing time, we observed that BFG fish gathered at the bottom of tank, as opposed to SFG fish, which swam in the whole water column. After 4 weeks of rearing, the fish were released into two similar streams. After about 2 months the fish were captured and the foodbase of the streams were examined. 30 fish from each group have been randomly selected for stomach contents analysis. In the shallow stream the growth rates were better for the BFG fish than the SFG and also a significantly higher number of typical benthic taxa was found in stomachs of the BFG fish than the SFG fish. In the deeper stream more food was found in the stomachs of the SFG fish than in the BFG fish. The analyzed results showed that factors such as stream depth, current velocity, and turbulence can also affect the rearing success of juvenile salmonids in hatchery streams. Bottom feeding fish during rearing has a positive impact only on the fish in shallow watercourses, where there is no turbulence, and the food is not carried by the current drift or washed out from the bottom into the drift.
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Affiliation(s)
- Tomasz Krepski
- Department of Hydrobiology, Institute of Biology, University of Szczecin, Szczecin, Poland
- * E-mail:
| | - Robert Czerniawski
- Department of Hydrobiology, Institute of Biology, University of Szczecin, Szczecin, Poland
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7
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O'Malley KG, Vaux F, Black AN. Characterizing neutral and adaptive genomic differentiation in a changing climate: The most northerly freshwater fish as a model. Ecol Evol 2019; 9:2004-2017. [PMID: 30847088 PMCID: PMC6392408 DOI: 10.1002/ece3.4891] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 12/03/2018] [Accepted: 12/04/2018] [Indexed: 01/01/2023] Open
Abstract
Arctic freshwater ecosystems have been profoundly affected by climate change. Given that the Arctic charr (Salvelinus alpinus) is often the only fish species inhabiting these ecosystems, it represents a valuable model for studying the impacts of climate change on species life-history diversity and adaptability. Using a genotyping-by-sequencing approach, we identified 5,976 neutral single nucleotide polymorphisms and found evidence for reduced gene flow between allopatric morphs from two high Arctic lakes, Linne'vatn (Anadromous, Normal, and Dwarf) and Ellasjøen (Littoral and Pelagic). Within each lake, the degree of genetic differentiation ranged from low (Pelagic vs. Littoral) to moderate (Anadromous and Normal vs. Dwarf). We identified 17 highly diagnostic, putatively adaptive SNPs that differentiated the allopatric morphs. Although we found no evidence for adaptive differences between morphs within Ellasjøen, we found evidence for moderate (Anadromous vs. Normal) to high genetic differentiation (Anadromous and Normal vs. Dwarf) among morphs within Linne'vatn based on two adaptive loci. As these freshwater ecosystems become more productive, the frequency of sympatric morphs in Ellasjøen will likely shift based on foraging opportunities, whereas the propensity to migrate may decrease in Linne'vatn, increasing the frequency of the Normal morph. The Dwarf charr was the most genetically distinct group. Identifying the biological basis for small body size should elucidate the potential for increased growth and subsequent interbreeding with sympatric morphs. Overall, neutral and adaptive genomic differentiation between allopatric and some sympatric morphs suggests that the response of Arctic charr to climate change will be variable across freshwater ecosystems.
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Affiliation(s)
- Kathleen G. O'Malley
- Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Department of Fisheries and WildlifeOregon State UniversityNewportOregon
| | - Felix Vaux
- Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Department of Fisheries and WildlifeOregon State UniversityNewportOregon
| | - Andrew N. Black
- Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Department of Fisheries and WildlifeOregon State UniversityNewportOregon
- Present address:
Center for Genome Research and BiocomputingOregon State UniversityCorvallisOregon
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8
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Franklin OD, Skúlason S, Morrissey MB, Ferguson MM. Natural selection for body shape in resource polymorphic Icelandic Arctic charr. J Evol Biol 2018; 31:1498-1512. [PMID: 29961959 DOI: 10.1111/jeb.13346] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 06/15/2018] [Accepted: 06/23/2018] [Indexed: 01/22/2023]
Abstract
Resource polymorphisms exhibit remarkable intraspecific diversity and in many cases are expected to be maintained by diversifying selection. Phenotypic trade-offs can constrain morphologically intermediate individuals from effectively exploiting both alternate resources, resulting in ecological barriers to gene flow. Determining if and how phenotypic trade-offs cause fitness variation in the wild is challenging because of phenotypic and environmental correlations associated with alternative resource strategies. We investigated multiple pathways through which morphology could affect organismal performance, as measured by growth rate, and whether these effects generate diversifying selection in polymorphic Icelandic Arctic charr (Salvelinus alpinus) populations. We considered direct effects of morphology on growth and indirect effects via trophic resource use, estimated by stable isotopic signatures, and via parasitism associated with trophic resources. We sampled over 3 years in (lakes) Thingvallavatn and Vatnshlíðarvatn using the extended selection gradient path analytical approach and estimating size-dependent mortality. We found evidence for diversifying selection only in Thingvallavatn: more streamlined and terminally mouthed planktivore charr experienced greater growth, with the opposite pattern in small benthic charr. However, this effect was mediated by parasitism and nontrophic pathways, rather than trophic performance as often expected. Detection of between-morph differences in the presence (Vatnshlíðarvatn) and direction (Thingvallavatn) of size-dependent mortality, together with nontrophic effects of shape, suggests that a morphological trophic performance explanation for polymorphism is insufficient. This rare insight into selection during early diversification suggests that a complex of interacting local factors must be considered to understand how phenotype influences fitness, despite morphological variation reflecting intuitive trade-off explanations.
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Affiliation(s)
- Oliver D Franklin
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - Skúli Skúlason
- Department of Aquaculture and Fish Biology, Hólar University College, Saudárkrókur, Iceland
| | - Michael B Morrissey
- Dyers Brae House, School of Biology, University of St. Andrews, St. Andrews, UK
| | - Moira M Ferguson
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
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9
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Sánchez-Hernández J, Cobo F. Examining the link between dietary specialization and foraging modes of stream-dwelling brown trout Salmo trutta. JOURNAL OF FISH BIOLOGY 2018; 93:143-146. [PMID: 29882215 DOI: 10.1111/jfb.13672] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 04/26/2018] [Indexed: 06/08/2023]
Abstract
The aim of this study was to explore differences in dietary specialization across two foraging modes (benthic v. surface-drift foraging) of stream-dwelling brown trout Salmo trutta. The degree of inter-individual niche variation within each foraging mode was high, but the dietary specialization was maintained between foraging modes. This study supports the view that if aquatic invertebrates are more abundant and accessible than surface prey, the individuals will not specialize on surface prey (surface-drift foraging).
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Affiliation(s)
- Javier Sánchez-Hernández
- Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Fernando Cobo
- Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
- Estación de Hidrobioloxía 'Encoro do Con', Universidade de Santiago de Compostela, Vilagarcía de Arousa, Spain
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10
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Hawley KL, Rosten CM, Haugen TO, Christensen G, Lucas MC. Freezer on, lights off! Environmental effects on activity rhythms of fish in the Arctic. Biol Lett 2018; 13:rsbl.2017.0575. [PMID: 29212752 DOI: 10.1098/rsbl.2017.0575] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 11/10/2017] [Indexed: 11/12/2022] Open
Abstract
Polar regions are characterized by acute seasonal changes in the environment, with organisms inhabiting these regions lacking diel photoperiodic information for parts of the year. We present, to our knowledge, the first high-resolution analysis of diel and seasonal activity of free-living fishes in polar waters (74°N), subject to extreme variation in photoperiod, temperature and food availability. Using biotelemetry, we tracked two sympatric ecomorphs of lake-dwelling Arctic charr (Salvelinus alpinus n = 23) over an annual cycle. Charr activity rhythms reflected the above-surface photoperiod (including under ice), with diel rhythms of activity observed. During the dark winter solstice period, charr activity became arrhythmic and much reduced, even though estimated light levels were within those at which charr can feed. When twilight resumed, charr activity ensued as diel vertical migration, which continued throughout spring and with increasing day length, despite stable water temperatures. Diel activity rhythms ceased during the polar day, with a sharp increase in arrhythmic fish activity occurring at ice-break. Despite contrasting resource use, circannual rhythms were mirrored in the two ecomorphs, although individual variability in activity rhythms was evident. Our data support conclusions of functionally adaptive periods of arrhythmicity in polar animals, suggesting maintenance of a circannual oscillator for scheduling seasonal behavioural and developmental processes.
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Affiliation(s)
- Kate L Hawley
- Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, 0349 Oslo, Norway .,Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Norway.,Department of Biosciences, Science Laboratories, Durham University, South Road, Durham, DH1 3LE, UK
| | - Carolyn M Rosten
- Norwegian Institute for Nature Research (NINA), Høgskoleringen 9, 7034 Trondheim, Norway
| | - Thrond O Haugen
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, 1432 Ås, Norway
| | | | - Martyn C Lucas
- Department of Biosciences, Science Laboratories, Durham University, South Road, Durham, DH1 3LE, UK
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11
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Ingram T, Costa-Pereira R, Araújo MS. The dimensionality of individual niche variation. Ecology 2018; 99:536-549. [DOI: 10.1002/ecy.2129] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 09/26/2017] [Accepted: 12/07/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Travis Ingram
- Department of Zoology; University of Otago; 340 Great King Street Dunedin 9016 New Zealand
| | - Raul Costa-Pereira
- Programa de Pós-graduação em Ecologia e Biodiversidade, Instituto de Biociências; Universidade Estadual Paulista (UNESP); Av. 24-A, 1515 Rio Claro 15807 Brazil
- Instituto de Biociências; Universidade Estadual Paulista (UNESP); Av. 24-A, 1515 Rio Claro 15807 Brazil
| | - Márcio S. Araújo
- Instituto de Biociências; Universidade Estadual Paulista (UNESP); Av. 24-A, 1515 Rio Claro 15807 Brazil
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