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Tremblay-Gagnon F, Brown-Vuillemin S, Skanes K, Polaczek H, Walkusz W, Robert D, Deslauriers D. Spatiotemporal variability in diet composition of Greenland halibut (Reinhardtius hippoglossoides) from the eastern Canadian Arctic. JOURNAL OF FISH BIOLOGY 2023; 103:1430-1444. [PMID: 37563757 DOI: 10.1111/jfb.15519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 06/16/2023] [Accepted: 08/01/2023] [Indexed: 08/12/2023]
Abstract
Greenland halibut (Reinhardtius hippoglossoides) sustain one of the most lucrative fisheries in the eastern Canadian Arctic and Labrador Sea. This species also plays an important role in food web connectivity and benthic-pelagic coupling. Despite the relatively rich knowledge of this species, R. hippoglossoides ecology in these specific areas remains poorly understood. The main aim of this study was to characterize the diet of this deepwater fish in the Labrador Sea and Davis and Hudson Straits and characterize the predator-prey relationship with northern shrimp (Pandalus borealis), another commercially important species in the region. Stomach contents analyses were conducted on 1199 fish captured from 2018 to 2020. Small specimens (<20 cm) fed on invertebrates, whereas larger individuals (>60 cm) fed primarily on fish, indicative of size-related changes in diet composition. The relative abundance of Pandalus shrimp species in the environment was reflected in the diet. Location appeared to be the most influential variable on feeding patterns. Distinct oceanographic conditions among areas, resulting in differences in prey availability, could explain these results. Arctic cod (Boreogadus saida) and redfish (Sebastes sp.) were selected in locations where fish prey were the most abundant. These results shed light on the opportunistic nature of R. hippoglossoides and its preference for fish at large size. With the rapidly changing oceanographic conditions of Arctic waters, a distributional change in the biomass of shrimp is expected. Results suggest that an increase in abundance of predatory groundfish species in the system (e.g., Sebastes sp.) could lead to acute predation on shrimp and competition with R. hippoglossoides. By revealing key trophic links within the demersal ecosystem, this work provides valuable information on the development of ecosystem approaches to fisheries management for the region.
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Affiliation(s)
- Félix Tremblay-Gagnon
- Institut des Sciences de la Mer, Université du Québec à Rimouski, Rimouski, Quebec, Canada
| | - Sarah Brown-Vuillemin
- Institut des Sciences de la Mer, Université du Québec à Rimouski, Rimouski, Quebec, Canada
| | - Katherine Skanes
- Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, Newfoundland, Canada
| | - Hannah Polaczek
- Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, Newfoundland, Canada
| | - Wojciech Walkusz
- Freshwater Institute, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, Manitoba, Canada
| | - Dominique Robert
- Institut des Sciences de la Mer, Université du Québec à Rimouski, Rimouski, Quebec, Canada
| | - David Deslauriers
- Institut des Sciences de la Mer, Université du Québec à Rimouski, Rimouski, Quebec, Canada
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Cyr AP, Drew KA, Corsetti S, Seitz AC, Sutton TM, López JA, Wooller MJ, O'Hara T. Ecotoxicology of mercury concentrations in arctic lamprey (Lethenteron camtschaticum). ENVIRONMENTAL RESEARCH 2023; 237:116955. [PMID: 37643685 PMCID: PMC10838160 DOI: 10.1016/j.envres.2023.116955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 08/10/2023] [Accepted: 08/21/2023] [Indexed: 08/31/2023]
Abstract
Arctic lamprey (Lethenteron camtschaticum) is an important dietary resource for rural and indigenous communities in parts of Alaska, with some commercial use. As with many fish species harvested for human consumption, there are concerns regarding mercury concentrations ([Hg]) in Arctic lamprey that may impact human health. To date, information regarding the life cycle and diet of Arctic lamprey is scarce, with no published studies examining [Hg] in Arctic lamprey tissues. Our goals were to investigate the feeding ecology of Arctic lamprey from the Bering Sea, determine how diet and potential dietary shifts might influence [Hg] in muscle, and determine if current [Hg] may pose a human health risk. The mean total [Hg] in Arctic lamprey muscle (n = 98) was 19 ng/g wet-weight. Log transformed total [Hg] were not associated with any measured biological variables including length, mass, δ13C values, or δ15N values. A stable isotope mixing model estimated that capelin (Mallotus villosus) accounted for 40.0 ± 4.0% of the Arctic lamprey diet, while Pacific sand lance (Ammodytes hexapterus) and Pacific herring (Clupea pallasii) accounted for 37.8 ± 3.1% and 22.2 ± 3.5% respectively. Finally, diet percentage compositions shifted based on size class (i.e., medium versus large). These results indicated that feeding location, bioaccumulation, and biomagnification are not important drivers of [Hg] in Arctic lamprey and current [Hg] do not pose a human health risk. Taken together, this research further expands our knowledge of Arctic lamprey trophic ecology in the eastern Bering Sea.
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Affiliation(s)
- Andrew P Cyr
- Department of Veterinary Medicine, University of Alaska Fairbanks, 901 Koyukuk Drive, Fairbanks, AK 99775-7750, USA.
| | - Katie A Drew
- College of Fisheries and Ocean Sciences, 2150 Koyukuk Drive, Fairbanks, AK 99775-7220, USA
| | - Sierra Corsetti
- Department of Biology and Wildlife, PO Box 756100, Fairbanks, AK 99775-6100, USA
| | - Andrew C Seitz
- College of Fisheries and Ocean Sciences, 2150 Koyukuk Drive, Fairbanks, AK 99775-7220, USA
| | - Trent M Sutton
- College of Fisheries and Ocean Sciences, 2150 Koyukuk Drive, Fairbanks, AK 99775-7220, USA
| | - J Andrés López
- College of Fisheries and Ocean Sciences, 2150 Koyukuk Drive, Fairbanks, AK 99775-7220, USA; University of Alaska Museum of the North, University of Alaska, Fairbanks, 907 Yukon Drive, Fairbanks, AK 99775-6960, USA
| | - Matthew J Wooller
- College of Fisheries and Ocean Sciences, 2150 Koyukuk Drive, Fairbanks, AK 99775-7220, USA; Water and Environmental Research Center, Institute of Northern Engineering, 306 Tanana Loop, Fairbanks, AK 99775-5910, USA; Alaska Stable Isotope Facility, University of Alaska, Fairbanks, 907 Yukon Drive, Fairbanks, AK 99775-5910, USA
| | - Todd O'Hara
- Water and Environmental Research Center, Institute of Northern Engineering, 306 Tanana Loop, Fairbanks, AK 99775-5910, USA; Bilingual Laboratory of Toxicology, Veterinary Integrative Biosciences, School of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843, USA
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3
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Baumbusch RC, Dugger KM, Wiens JD. Estimating fat content in barred owls ( Strix varia) with predictive models developed from direct measures of proximate body composition. CONSERVATION PHYSIOLOGY 2023; 11:coad069. [PMID: 37671235 PMCID: PMC10476696 DOI: 10.1093/conphys/coad069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 08/01/2023] [Accepted: 08/17/2023] [Indexed: 09/07/2023]
Abstract
Body condition indices and related metrics can help assess habitat quality and other ecological processes, and ideally, these metrics are based on measures of lipids directly extracted from the species of interest. In recent decades, barred owls (Strix varia) have become a species of conservation concern as they invaded older forests of the US Pacific Northwest, and caused population declines of the closely related and federally threatened northern spotted owl (Strix occidentalis caurina). A simple and effective measure of barred owl body condition could help to understand how habitat quality varies within their new range, which in turn can inform their management and other aspects of their ecology. Using 77 barred owl carcasses collected during experimental removals in Washington and Oregon, USA, we measured the amount of lipid in each specimen with proximate body composition analysis. We then fit and compared (with adjusted R2 values) alternative linear regression models to estimate the percent lipids in dry mass of the owls based on morphometric body condition indices, a qualitative fat score of subcutaneous breast fat, sex and the time of year females were collected (relative to egg production). Adjusted R2 values for all models ranged from 0.49 to 0.87, with the best model including mass divided by foot-pad length, fat score, sex and the time of year a female was collected. Most models generated comparable estimates of percent lipids at a population level and we provided correction factors to apply these models when used with live barred owls, allowing for site-specific comparisons of body condition among individuals inhabiting a diversity of environmental conditions.
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Affiliation(s)
- Ryan C Baumbusch
- Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries, Wildlife, and Conservation Sciences, Oregon State University, 104 Nash Hall, Corvallis, OR, 97331 USA
| | - Katie M Dugger
- U.S. Geological Survey, Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries, Wildlife, and Conservation Sciences, 104 Nash Hall, Corvallis, OR, 97331 USA
| | - J David Wiens
- U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR, 97331 USA
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Jensen CH, Weidner J, Giske J, Jørgensen C, Eliassen S, Mennerat A. Adaptive host responses to infection can resemble parasitic manipulation. Ecol Evol 2023; 13:e10318. [PMID: 37456066 PMCID: PMC10349281 DOI: 10.1002/ece3.10318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 06/22/2023] [Accepted: 07/04/2023] [Indexed: 07/18/2023] Open
Abstract
Using a dynamic optimisation model for juvenile fish in stochastic food environments, we investigate optimal hormonal regulation, energy allocation and foraging behaviour of a growing host infected by a parasite that only incurs an energetic cost. We find it optimal for the infected host to have higher levels of orexin, growth and thyroid hormones, resulting in higher activity levels, increased foraging and faster growth. This growth strategy thus displays several of the fingerprints often associated with parasite manipulation: higher levels of metabolic hormones, faster growth, higher allocation to reserves (i.e. parasite-induced gigantism), higher risk-taking and eventually higher predation rate. However, there is no route for manipulation in our model, so these changes reflect adaptive host compensatory responses. Interestingly, several of these changes also increase the fitness of the parasite. Our results call for caution when interpreting observations of gigantism or risky host behaviours as parasite manipulation without further testing.
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Affiliation(s)
| | | | - Jarl Giske
- Department of Biological SciencesUniversity of BergenBergenNorway
| | | | - Sigrunn Eliassen
- Department of Biological SciencesUniversity of BergenBergenNorway
| | - Adèle Mennerat
- Department of Biological SciencesUniversity of BergenBergenNorway
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López-Pérez C, Olivar MP, Tuset VM, Bernal A, Hulley PA. Energy density of mesopelagic fishes from the Atlantic Ocean. JOURNAL OF FISH BIOLOGY 2023; 102:924-935. [PMID: 36661214 DOI: 10.1111/jfb.15331] [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: 05/12/2022] [Accepted: 01/17/2023] [Indexed: 06/17/2023]
Abstract
Mesopelagic fishes play a central role in marine food webs linking primary consumers to top predators. In this study, measures of direct calorimetry were used to analyse the energy density (ED) of 34 mesopelagic species collected at 12 stations in the equatorial and tropical Atlantic. Mean ED ranged from 2.7 kJ g-1 wet weight (WW) for the lanterfish Lampanyctus nobilis to 8.7 kJ g-1 WW for the lanterfish Benthosema glaciale. This study includes species of the orders Myctophiformes and Stomiiformes and represents migrants, non-migrants and partial-migrants species. The majority of the species were grouped into the medium-energy quality category (ED from 4 to 6 kJ g-1 ); Myctophiformes showed higher energetic values than the Stomiiformes. For the different species, the ED values were discussed in relation to spawning period and energy allocation strategies for reproduction and growth and feeding and migratory behaviour, as well as the ecoregion of study. These values will be useful for future assessment of energetic transfer between trophic levels and energetic modelling of Atlantic ecosystems.
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Affiliation(s)
- Cristina López-Pérez
- Department of Renewable Marine Resources, Institute of Marine Sciences (CSIC), Barcelona, Spain
| | - María Pilar Olivar
- Department of Renewable Marine Resources, Institute of Marine Sciences (CSIC), Barcelona, Spain
| | - Víctor M Tuset
- Department of Renewable Marine Resources, Institute of Marine Sciences (CSIC), Barcelona, Spain
| | - Ainhoa Bernal
- Department of Renewable Marine Resources, Institute of Marine Sciences (CSIC), Barcelona, Spain
| | - Percy Alexander Hulley
- Marine Biology Department, Iziko - South African Museum, Cape Town, South Africa
- MA-RE Institute, University of Cape Town, Cape Town, South Africa
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Valenzuela-Toro AM, Mehta R, Pyenson ND, Costa DP, Koch PL. Feeding morphology and body size shape resource partitioning in an eared seal community. Biol Lett 2023; 19:20220534. [PMID: 36883314 PMCID: PMC9993223 DOI: 10.1098/rsbl.2022.0534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
Body size and feeding morphology influence how animals partition themselves within communities. We tested the relationships among sex, body size, skull morphology and foraging in sympatric otariids (eared seals) from the eastern North Pacific Ocean, the most diverse otariid community in the world. We recorded skull measurements and stable carbon (δ13C) and nitrogen (δ15N) isotope values (proxies for foraging) from museum specimens in four sympatric species: California sea lions (Zalophus californianus), Steller sea lions (Eumetopias jubatus), northern fur seals (Callorhinus ursinus) and Guadalupe fur seals (Arctocephalus townsendi). Species and sexes had statistical differences in size, skull morphology and foraging significantly affecting the δ13C values. Sea lions had higher δ13C values than fur seals, and males of all species had higher values than females. The δ15N values were correlated with species and feeding morphology; individuals with stronger bite forces had higher δ15N values. We also found a significant community-wide correlation between skull length (indicator of body length), and foraging, with larger individuals having nearshore habitat preferences, and consuming higher trophic level prey than smaller individuals. Still, there was no consistent association between these traits at the intraspecific level, indicating that other factors might account for foraging variability.
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Affiliation(s)
- Ana M Valenzuela-Toro
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA 95060, USA.,Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
| | - Rita Mehta
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA 95060, USA
| | - Nicholas D Pyenson
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA 95060, USA.,Department of Paleontology and Geology, Burke Museum of Natural History and Culture, Seattle, WA 98105, USA
| | - Daniel P Costa
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA 95060, USA.,Institute of Marine Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA
| | - Paul L Koch
- Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA
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7
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Ren J, Point AD, Baygi SF, Fernando S, Hopke PK, Holsen TM, Crimmins BS. Bioaccumulation of perfluoroalkyl substances in the Lake Erie food web. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 317:120677. [PMID: 36400140 DOI: 10.1016/j.envpol.2022.120677] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/27/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
The bioaccumulation and biomagnification of perfluoroalkyl substances (PFAS) in the Lake Erie food web was investigated by analyzing surface water and biological samples including 10 taxa of fish species, 2 taxa of benthos and zooplankton. The carbon (δ13C) and nitrogen (δ15N) isotopic composition and fatty acids profiles of biological samples were used to evaluate the food web structure and assess the biomagnification of PFAS. Perfluorooctane sulfonate (PFOS) dominated the total PFAS (ΣPFAS) concentration (50-90% of ΣPFAS concentration), followed by C9-C11 perfluorinated carboxylic acids (PFCAs). The highest PFOS concentrations (79 ± 4.8 ng/g, wet weight (wwt)) and ΣPFAS (88 ± 5.2 ng/g, wwt) were detected in yellow perch (Perca flavescens). The C8-C14 PFAS biomagnification factors (BMFs) between apex piscivorous fish and prey fish were found to be generally greater than 1, indicative of PFAS biomagnification, while biodilution (BMF<1) was observed between planktivorous fish and zooplankton. Trophic magnification factors (TMFs) of C8-C14 PFCA were not correlated with perfluoroalkyl chain length. The C4-C9 PFAS were detected in the surface water of Lake Erie, and PFBA was found to have the highest concentrations (2.1-2.8 ng/L) among all PFAS detected. The log of bioaccumulation factor (BAF) was found to generally increase with increasing log Kow for C6, 8, and 9 PFAS in all selected species from three tropic levels.
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Affiliation(s)
- Junda Ren
- Clarkson University, Department of Civil and Environmental Engineering, 8 Clarkson Avenue, Potsdam, NY, 13699, USA
| | - Adam D Point
- Institute for a Sustainable Environment, Clarkson University, Potsdam, NY, USA
| | - Sadjad Fakouri Baygi
- Clarkson University, Department of Chemical and Biomolecular Engineering, 8 Clarkson Avenue, Potsdam, NY, 13699, USA
| | - Sujan Fernando
- Clarkson University, Center for Air Resources Engineering and Science, 8 Clarkson Avenue, Potsdam, NY, 13699, USA
| | - Philip K Hopke
- Institute for a Sustainable Environment, Clarkson University, Potsdam, NY, USA; Clarkson University, Center for Air Resources Engineering and Science, 8 Clarkson Avenue, Potsdam, NY, 13699, USA; Department of Public Health Sciences, University of Rochester Medical Center, Rochester, NY, USA
| | - Thomas M Holsen
- Clarkson University, Department of Civil and Environmental Engineering, 8 Clarkson Avenue, Potsdam, NY, 13699, USA; Clarkson University, Center for Air Resources Engineering and Science, 8 Clarkson Avenue, Potsdam, NY, 13699, USA
| | - Bernard S Crimmins
- Clarkson University, Department of Civil and Environmental Engineering, 8 Clarkson Avenue, Potsdam, NY, 13699, USA; Clarkson University, Department of Chemical and Biomolecular Engineering, 8 Clarkson Avenue, Potsdam, NY, 13699, USA; AEACS, LLC, New Kensington, PA, USA.
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8
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Munschy C, Spitz J, Bely N, Héas-Moisan K, Olivier N, Pollono C, Chouvelon T. A large diversity of organohalogen contaminants reach the meso- and bathypelagic organisms in the Bay of Biscay (northeast Atlantic). MARINE POLLUTION BULLETIN 2022; 184:114180. [PMID: 36183511 DOI: 10.1016/j.marpolbul.2022.114180] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 09/22/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Deep-sea ecosystems play a key role in the cycling and vertical transfer of matter and energy in oceans. Although the contamination of deep-sea demersal and benthic organisms by persistent organic pollutants has been proven, deep pelagic species have been far less studied. To fill these gaps, we studied the occurrence of a large variety of hydrophobic organic contaminants including polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), legacy and alternative brominated flame retardants (BFRs) and per- and polyfluoroalkyl substances (PFASs) in crustaceans and fish species collected in the Bay of Biscay, northeast Atlantic. The results highlighted the global predominance of PCBs in fish, followed by OCPs, PFASs and PBDEs, with highly variable concentrations among species. Most of the chlorinated or brominated contaminants showed increasing concentrations with increasing δ15N values, while most PFASs showed inverse trends. The contaminant profiles and diagnostic ratios revealed species-specific metabolic capacities and peculiar contribution of highly-brominated BFRs.
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Affiliation(s)
- C Munschy
- Ifremer, CCEM Contamination Chimique des Ecosystèmes Marins, F-44000 Nantes, France.
| | - J Spitz
- Centre d'Etude Biologique de Chizé (CEBC), UMR 7372, Université de La Rochelle / CNRS, 79360 Villiers-en-Bois, France; Observatoire PELAGIS, UAR 3462, Université de La Rochelle / CNRS, 17000 La Rochelle, France
| | - N Bely
- Ifremer, CCEM Contamination Chimique des Ecosystèmes Marins, F-44000 Nantes, France
| | - K Héas-Moisan
- Ifremer, CCEM Contamination Chimique des Ecosystèmes Marins, F-44000 Nantes, France
| | - N Olivier
- Ifremer, CCEM Contamination Chimique des Ecosystèmes Marins, F-44000 Nantes, France
| | - C Pollono
- Ifremer, CCEM Contamination Chimique des Ecosystèmes Marins, F-44000 Nantes, France
| | - T Chouvelon
- Ifremer, CCEM Contamination Chimique des Ecosystèmes Marins, F-44000 Nantes, France; Observatoire PELAGIS, UAR 3462, Université de La Rochelle / CNRS, 17000 La Rochelle, France
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9
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Geffroy B. Energy as the cornerstone of environmentally driven sex allocation. Trends Endocrinol Metab 2022; 33:670-679. [PMID: 35934660 DOI: 10.1016/j.tem.2022.07.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 07/13/2022] [Accepted: 07/15/2022] [Indexed: 11/18/2022]
Abstract
In recent years, observations of distinct organisms have linked the quality of the environment experienced by a given individual and the sex it will develop. In most described cases, facing relatively harsh conditions resulted in masculinization, while thriving in favorable conditions promoted the development of an ovary. This was shown indistinctively in some species presenting a genetic sex determination (GSD), which were able to sex-reverse, and in species with an environmental sex determination (ESD) system. However, this pattern strongly depends on evolutionary constrains and is detected only when females need more energy for reproduction. Here, I describe the mechanisms involved in this environmentally driven sex allocation (EDSA), which involves two main energy pathways, lipid and carbohydrate metabolism. These pathways act through various enzymes and are not necessarily independent of the previously known transducers of environmental signals in species with ESD: calcium-redox, epigenetic, and stress regulation pathways. Overall, there is evidence of a link between energy level and the sexual fate of individuals of various species, including reptiles, fish, amphibians, insects, and nematodes. As energy pathways are evolutionarily conserved, this knowledge opens new avenues to advance our understanding of the mechanisms that allow animals to adapt their sex according to the local environment.
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Affiliation(s)
- Benjamin Geffroy
- MARBEC, Univ Montpellier, Ifremer, IRD, CNRS, Montpellier, France.
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10
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Fitri N, Chan SXY, Che Lah NH, Jam FA, Misnan NM, Kamal N, Sarian MN, Mohd Lazaldin MA, Low CF, Hamezah HS, Rohani ER, Mediani A, Abas F. A Comprehensive Review on the Processing of Dried Fish and the Associated Chemical and Nutritional Changes. Foods 2022; 11:2938. [PMID: 36230013 PMCID: PMC9562176 DOI: 10.3390/foods11192938] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/03/2022] [Accepted: 09/07/2022] [Indexed: 11/16/2022] Open
Abstract
Fish is a good source of nutrients, although it is easily spoiled. As such, drying is a common method of preserving fish to compensate for its perishability. Dried fish exists in different cultures with varying types of fish used and drying methods. These delicacies are not only consumed for their convenience and for their health benefits, as discussed in this review. Most commonly, salt and spices are added to dried fish to enhance the flavours and to decrease the water activity (aw) of the fish, which further aids the drying process. For fish to be dried effectively, the temperature, drying environment, and time need to be considered along with the butchering method used on the raw fish prior to drying. Considering the various contributing factors, several physicochemical and biochemical changes will certainly occur in the fish. In this review, the pH, water activity (aw), lipid oxidation, and colour changes in fish drying are discussed as well as the proximate composition of dried fish. With these characteristic changes in dried fish, the sensory, microbial and safety aspects of dried fish are also affected, revolving around the preferences of consumers and their health concerns, especially based on how drying is efficient in eliminating/reducing harmful microbes from the fish. Interestingly, several studies have focused on upscaling the efficiency of dried fish production to generate a safer line of dried fish products with less effort and time. An exploratory approach of the published literature was conducted to achieve the purpose of this review. This evaluation gathers important information from all available library databases from 1990 to 2022. In general, this review will benefit the fishery and food industry by enabling them to enhance the efficiency and safety of fish drying, hence minimising food waste without compromising the quality and nutritional values of dried fish.
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Affiliation(s)
- Nursyah Fitri
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia
| | - Sharon Xi Ying Chan
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia
| | - Noor Hanini Che Lah
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia UKM, Bangi 43600, Malaysia
| | - Faidruz Azura Jam
- Faculty of Medicine, Manipal University College Malaysia (MUCM), Jalan Padang Jambu, Bukit Baru 75150, Malaysia
| | - Norazlan Mohmad Misnan
- Herbal Medicine Research Centre, Institute for Medical Research, National Institutes of Health, Shah Alam 40170, Malaysia
| | - Nurkhalida Kamal
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia UKM, Bangi 43600, Malaysia
| | - Murni Nazira Sarian
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia UKM, Bangi 43600, Malaysia
| | | | - Chen Fei Low
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia UKM, Bangi 43600, Malaysia
| | - Hamizah Shahirah Hamezah
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia UKM, Bangi 43600, Malaysia
| | - Emelda Rosseleena Rohani
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia UKM, Bangi 43600, Malaysia
| | - Ahmed Mediani
- Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia UKM, Bangi 43600, Malaysia
| | - Faridah Abas
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia
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Gül G, Demirel N. Ontogenetic shift in diet and trophic role of Raja clavata inferred by stable isotopes and stomach content analysis in the Sea of Marmara. JOURNAL OF FISH BIOLOGY 2022; 101:560-572. [PMID: 35638307 DOI: 10.1111/jfb.15123] [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: 01/10/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
Trophic ecology studies on predator-prey interactions reveal insights into ecological communities and help understand a species' role in the food web by contributing to improved fisheries management and conservation capabilities. Understanding the ecological role of overexploited and endangered predators is essential to deciphering how their feeding behaviour influences food web dynamics. In this study, the authors investigated the feeding behaviour of the common and IUCN-listed Near Threatened (NT) thornback ray Raja clavata, using carbon and nitrogen stable isotope and stomach content analysis (SCA). It has recently suffered an 87% decline in reported catches from the Sea of Marmara within the last decade. These results show that thornback ray mainly feeds on teleost species, except in summer, with both methods showing this species changes its diet ontogenetically by SCA. This ontogenetic diet shift was at lengths 40-50 cm by changing group preferences from Crustacea to Teleostei. MixSIAR results showed that both adult and juvenile individuals of R. clavata feed mainly on the crustaceans, but the contribution of teleosts represented by Trachurus sp. was very low (<15%). The trophic position increased total length and was higher than other batoid species in the Sea of Marmara.
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Affiliation(s)
- Güzin Gül
- Institute of Marine Sciences and Management, Istanbul University, Istanbul, Turkey
| | - Nazli Demirel
- Institute of Marine Sciences and Management, Istanbul University, Istanbul, Turkey
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12
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Ren J, Point AD, Baygi SF, Fernando S, Hopke PK, Holsen TM, Crimmins BS. Bioaccumulation of polyfluoroalkyl substances in the Lake Huron aquatic food web. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 819:152974. [PMID: 35007599 DOI: 10.1016/j.scitotenv.2022.152974] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 01/04/2022] [Accepted: 01/04/2022] [Indexed: 06/14/2023]
Abstract
Polyfluoroalkyl substances (PFAS) are a group of fluorinated organic chemicals that have been produced for industrial and commercial application since the 1950s. PFAS are highly persistent and ubiquitous in water, sediment, and biota. Toxic effects of PFAS on humans and the ecosystem have increased scientific and public concern. To better understand the distribution of PFAS in the Laurentian Great Lakes, carbon (12C and 13C) and nitrogen (14N and 15N) stable isotope enrichment, fatty acid profiles, and PFAS were measured in the Lake Huron (LH) aquatic food web. The trophic level of the organisms was estimated using δ15N and found to be a determinant of PFAS biomagnification. The δ13C and fatty acid profiles were used to assess the carbon/energy flow pathway and predator-prey relationships, respectively. The δ13C, δ15N, and fatty acids were used to elucidate the trophodynamics and understand the PFAS trophic transfer in the LH aquatic food web. Perfluorooctanesulfonic acid (PFOS) was the dominant PFAS observed, followed by C9 - C11 perfluorinated carboxylic acids (PFCA). The highest PFOS concentrations (45 ± 11 ng/g, wet weight (wwt)) were detected in lake trout (Salvelinus namaycush), while the highest total PFCA concentrations (sum of C4 - C16 PFCAs) were detected in deepwater sculpin (Myoxocephalus thompsonii). With the exception of perfluorooctanoic acid (PFOA), C8-C14 PFAS biomagnification factors (BMFs) were found to be generally greater than 1, suggesting PFAS biomagnification from prey to predator. Trophic magnification factors (TMFs) of C8-C14 PFCA were found to be independent of compound hydrophobicity.
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Affiliation(s)
- Junda Ren
- Clarkson University, Department of Civil and Environmental Engineering, 8 Clarkson Avenue, Potsdam, NY 13699, USA
| | - Adam D Point
- Institute for a Sustainable Environment, Clarkson University, Potsdam, NY, USA
| | - Sadjad Fakouri Baygi
- Clarkson University, Department of Chemical and Biomolecular Engineering, 8 Clarkson Avenue, Potsdam, NY 13699, USA
| | - Sujan Fernando
- Clarkson University, Center for Air Resources Engineering and Science, 8 Clarkson Avenue, Potsdam, NY 13699, USA
| | - Philip K Hopke
- Institute for a Sustainable Environment, Clarkson University, Potsdam, NY, USA; Clarkson University, Center for Air Resources Engineering and Science, 8 Clarkson Avenue, Potsdam, NY 13699, USA; Department of Public Health Sciences, University of Rochester Medical Center, Rochester, NY, USA
| | - Thomas M Holsen
- Clarkson University, Department of Civil and Environmental Engineering, 8 Clarkson Avenue, Potsdam, NY 13699, USA; Clarkson University, Center for Air Resources Engineering and Science, 8 Clarkson Avenue, Potsdam, NY 13699, USA
| | - Bernard S Crimmins
- Clarkson University, Department of Chemical and Biomolecular Engineering, 8 Clarkson Avenue, Potsdam, NY 13699, USA; AEACS, LLC, New Kensington, PA, USA.
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13
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Campanini C, Albo-Puigserver M, Gérez S, Lloret-Lloret E, Giménez J, Pennino MG, Bellido JM, Colmenero AI, Coll M. Energy content of anchovy and sardine using surrogate calorimetry methods. MARINE ENVIRONMENTAL RESEARCH 2021; 172:105510. [PMID: 34717130 DOI: 10.1016/j.marenvres.2021.105510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 10/19/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
European anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) are crucial species for the marine ecosystem of the Northwestern Mediterranean Sea. They account for a high percentage of fish landings and they represent an important economic income for the fishery sector. Concerns over their stock status are rising in recent years as biomass, growth, reproductive capacity, and body condition of both species are declining, with latitudinal variations. Therefore, there is an urgent need for a body condition monitoring scheme. Energy storage variability has important implications for both fish recruitment and population structure. Direct condition indices, such as energy density (ED) with bomb calorimetry, are highly reliable for measuring the energy content, but time-consuming. Alternatively, fatmeter analysis and relative condition index (Kn) have been proposed as effective indirect methods. The aim of this study is to test the application of fatmeter as a surrogate of bomb calorimetry to infer the energy content of sardine and anchovy. To validate its use, fatmeter values were compared with both ED and Kn values. Individuals of both species were sampled monthly for a year in order to assess seasonal variations in energy content. Our results highlight that fatmeter measurements are strongly correlated with calorimetry ED for sardine, while a weaker but significant correlation was found for anchovy. The observed differences between the two species are related to their breeding strategies. Based on this study, Kn cannot be considered a good proxy of the energy density of sardine, in particular during the resting period. By contrast, fatmeter analysis appears to be a faster and suitable method to evaluate the energy content of both species routinely. In addition, we provide a linear model to infer ED from fatmeter values for both small pelagic fish. Eventually, these findings could be used to implement body condition monitoring protocols and boost continuous large-scale monitoring.
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Affiliation(s)
- Claudia Campanini
- Department of Renewable Marine Resources, Institute of Marine Sciences (ICM-CSIC), Barcelona, 08003, Spain.
| | - Marta Albo-Puigserver
- Department of Renewable Marine Resources, Institute of Marine Sciences (ICM-CSIC), Barcelona, 08003, Spain; Centro de Ciências do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, Faro, 8005-139, Portugal
| | - Sara Gérez
- Department of Renewable Marine Resources, Institute of Marine Sciences (ICM-CSIC), Barcelona, 08003, Spain
| | - Elena Lloret-Lloret
- Department of Renewable Marine Resources, Institute of Marine Sciences (ICM-CSIC), Barcelona, 08003, Spain
| | - Joan Giménez
- Department of Renewable Marine Resources, Institute of Marine Sciences (ICM-CSIC), Barcelona, 08003, Spain; MaREI Centre, Environmental Research Institute, University College Cork, Cork, P43 C573, Ireland
| | - Maria Grazia Pennino
- Fishery Department, Instituto Español de Oceanografía (IEO-CSIC). Centro Oceanográfico de Vigo. Subida a Radio Faro, 50-52, Vigo, Pontevedra, 36390, Spain
| | - José María Bellido
- Fishery Department, Instituto Español de Oceanografía (IEO-CSIC), Centro Oceanográfico de Murcia, San Pedro del Pinatar, 30740, Spain
| | - Ana I Colmenero
- Department of Renewable Marine Resources, Institute of Marine Sciences (ICM-CSIC), Barcelona, 08003, Spain
| | - Marta Coll
- Department of Renewable Marine Resources, Institute of Marine Sciences (ICM-CSIC), Barcelona, 08003, Spain
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14
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Love MS, Bizzarro JJ, Cornthwaite AM, Frable BW, Maslenikov KP. Checklist of marine and estuarine fishes from the AlaskaYukon Border, Beaufort Sea, to Cabo San Lucas, Mexico. Zootaxa 2021; 5053:1-285. [PMID: 34810850 DOI: 10.11646/zootaxa.5053.1.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Indexed: 11/04/2022]
Abstract
This paper is a checklist of the fishes that have been documented, through both published and unpublished sources, in marine and estuarine waters, and out 200 miles, from the United States-Canadian border on the Beaufort Sea to Cabo San Lucas, Mexico. A minimum of 241 families and 1,644 species are known within this range, including both native and nonnative species. For each of these species, we include maximum size, geographic and depth ranges, whether it is native or nonnative, as well as a brief mention of any taxonomic issues.
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Affiliation(s)
- Milton S Love
- Marine Science Institute, University of California, Santa Barbara, CA 93106.
| | - Joseph J Bizzarro
- Cooperative Institute for Marine Ecosystems and Climate, University of California, Santa Cruz, 110 McAllister Way, Santa Cruz, CA 95060. .
| | - A Maria Cornthwaite
- Pacific Biological Station, Fisheries and Oceans Canada, 3190 Hammond Bay Road, Nanaimo, BC, V9T 6N7, Canada .
| | - Benjamin W Frable
- Marine Vertebrate Collection, Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0244, USA. .
| | - Katherine P Maslenikov
- University of Washington Fish Collection, School of Aquatic and Fishery Sciences and Burke Museum of Natural History and Culture, 1122 NE Boat St., Seattle, WA 98105.
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15
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Neises VM, Karpovich SA, Keogh MJ, King RS, Trumble SJ. Regional, seasonal and age class blubber fatty acid signature analysis of harbour seals in Alaska from 1997 to 2010. CONSERVATION PHYSIOLOGY 2021; 9:coab036. [PMID: 35685345 PMCID: PMC8628356 DOI: 10.1093/conphys/coab036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 03/31/2021] [Accepted: 05/07/2021] [Indexed: 06/15/2023]
Abstract
Alaskan harbour seal populations are currently listed as a species of special concern. Although there is evidence of recent stabilization or even partial recovery of harbour seal numbers in areas of historic decline, most populations have not made substantial recoveries. To date, few data exist regarding spatial and seasonal changes in blubber fatty acids (FAs) for Alaskan harbour seal populations. The purpose of this study was to qualitatively investigate harbour seal blubber FA profiles for regional, seasonal and age class differences. Blubber FA concentrations were analysed using MANOVA and linear discriminant analysis (LDA) from 760 individual harbour seals across Bristol Bay, Kodiak, Prince William Sound and Southeast Alaska from 1997 to 2010. Our results suggest spatial and seasonal differences are largely driven by monounsaturated FAs, most notably 14:1n-5, 16:1n-7 and 18:1n-7. In addition, our data revealed a progression in blubber FAs from pups to adults, with a shift from saturated FAs and short-chained monounsaturated FAs in the pup blubber to more long-chain monounsaturated FAs and polyunsaturated FAs in adults. Lastly, harbour seals pups had elevated saturated FA 16:0 concentrations when compared to other age classes, regardless of location or period. With this vast spatial and seasonal FA information, we believe future sampling of blubber FAs from Alaskan harbour seal populations could be a useful tool in assessing the response of this species and its ecosystem to changes associated with natural and anthropogenic pressures.
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Affiliation(s)
| | | | - Mandy J Keogh
- Alaska Department of Fish and Game, Fairbanks, AK 99701, USA
| | - Ryan S King
- Department of Biology, Baylor University, Waco, TX
76798, USA
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16
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Schwarz JFL, Mews S, DeRango EJ, Langrock R, Piedrahita P, Páez-Rosas D, Krüger O. Individuality counts: A new comprehensive approach to foraging strategies of a tropical marine predator. Oecologia 2021; 195:313-325. [PMID: 33491108 PMCID: PMC7882564 DOI: 10.1007/s00442-021-04850-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 01/04/2021] [Indexed: 11/24/2022]
Abstract
Foraging strategies are of great ecological interest, as they have a strong impact on the fitness of an individual and can affect its ability to cope with a changing environment. Recent studies on foraging strategies show a higher complexity than previously thought due to intraspecific variability. To reliably identify foraging strategies and describe the different foraging niches they allow individual animals to realize, high-resolution multivariate approaches which consider individual variation are required. Here we dive into the foraging strategies of Galápagos sea lions (Zalophus wollebaeki), a tropical predator confronted with substantial annual variation in sea surface temperature. This affects prey abundance, and El Niño events, expected to become more frequent and severe with climate change, are known to have dramatic effects on sea lions. This study used high-resolution measures of depth, GPS position and acceleration collected from 39 lactating sea lion females to analyze their foraging strategies at an unprecedented level of detail using a novel combination of automated broken stick algorithm, hierarchical cluster analysis and individually fitted multivariate hidden Markov models. We found three distinct foraging strategies (pelagic, benthic, and night divers), which differed in their horizontal, vertical and temporal distribution, most likely corresponding to different prey species, and allowed us to formulate hypotheses with regard to adaptive values under different environmental scenarios. We demonstrate the advantages of our multivariate approach and inclusion of individual variation to reliably gain a deeper understanding of the adaptive value and ecological relevance of foraging strategies of marine predators in dynamic environments.
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Affiliation(s)
- Jonas F L Schwarz
- Department of Animal Behaviour, Bielefeld University, Bielefeld, Germany.
| | - Sina Mews
- Department of Business Administration and Economics, Bielefeld University, Bielefeld, Germany
| | - Eugene J DeRango
- Department of Animal Behaviour, Bielefeld University, Bielefeld, Germany
| | - Roland Langrock
- Department of Business Administration and Economics, Bielefeld University, Bielefeld, Germany
| | - Paolo Piedrahita
- Facultad de Ciencias de La Vida, Escuela Superior Politécnica del Litoral, Guayaquil, Ecuador
| | - Diego Páez-Rosas
- Galápagos Science Center, Universidad San Francisco de Quito, Puerto Baquerizo Moreno, Ecuador.,Dirección Parque Nacional Galápagos, Unidad Técnica Operativa San Cristóbal, Puerto Baquerizo Moreno, Ecuador
| | - Oliver Krüger
- Department of Animal Behaviour, Bielefeld University, Bielefeld, Germany
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17
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Tomlin H, Schellenberg C, Barrs JB, Vivani AJ, Shaw P. Identifying and monitoring of forage fish spawning beaches in British Columbia’s Salish Sea for conservation of forage fish. Facets (Ott) 2021. [DOI: 10.1139/facets-2020-0038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Pacific sand lance ( Ammodytes personatus) and surf smelt ( Hypomesus pretiosus) are ecologically important forage fish in the marine food webs within the Salish Sea, including British Columbia (BC). Although important, little information exists around the spatiotemporal distribution of these fishes’ beach spawning habitat in the BC Salish Sea. In 2017, the Mount Arrowsmith Biosphere Region Research Institute initiated spawning beach surveys within the Mount Arrowsmith Biosphere Region (MABR). Surveys have geographically expanded along the eastern Vancouver Island coastline between Bowser and Cowichan Bay, BC, including Gabriola Island and Thetis Island. Pacific sand lance embryos have been detected at 17 beaches, with six beaches located within the MABR. Pacific sand lance spawning events have been detected between November and mid-February, with the bulk of embryos detected in November and December. To date, surf smelt embryos have not been detected at the 56 different beaches. These data begin to fill existing data gaps surrounding Pacific sand lance and surf smelt in BC. Furthermore, longer-term data submissions to the Strait of Georgia Data Centre, an open-access database, will provide the necessary data needed to advocate for improved regulatory protections for these ecologically important fish and their spawning habitat.
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Affiliation(s)
- Haley Tomlin
- Mount Arrowsmith Biosphere Region Research Institute, Vancouver Island University, Building 305-4, 900 Fifth Street, Nanaimo, BC V9R 5S5, Canada
| | - Chrissy Schellenberg
- Mount Arrowsmith Biosphere Region Research Institute, Vancouver Island University, Building 305-4, 900 Fifth Street, Nanaimo, BC V9R 5S5, Canada
| | - Jacklyn B. Barrs
- World Wildlife Fund—Canada, 259-560 Johnson Street, Victoria, BC V8W 3C6, Canada
| | - Alanna J.S. Vivani
- Mount Arrowsmith Biosphere Region Research Institute, Vancouver Island University, Building 305-4, 900 Fifth Street, Nanaimo, BC V9R 5S5, Canada
| | - Pam Shaw
- Mount Arrowsmith Biosphere Region Research Institute, Vancouver Island University, Building 305-4, 900 Fifth Street, Nanaimo, BC V9R 5S5, Canada
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18
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Knudson TW, Lovvorn JR, Lawonn MJ, Corcoran RM, Roby DD, Piatt JF, Pyle WH. Can oceanic prey effects on growth and time to fledging mediate terrestrial predator limitation of an at‐risk seabird? Ecosphere 2020. [DOI: 10.1002/ecs2.3229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Timothy W. Knudson
- Department of Zoology Southern Illinois University 1125 Lincoln Drive Carbondale Illinois62901USA
| | - James R. Lovvorn
- Department of Zoology Southern Illinois University 1125 Lincoln Drive Carbondale Illinois62901USA
| | - M. James Lawonn
- Department of Fisheries and Wildlife Oregon State University 104 Nash Hall Corvallis Oregon97331USA
| | - Robin M. Corcoran
- U.S. Fish and Wildlife ServiceKodiak National Wildlife Refuge 1390 Buskin River Road Kodiak Alaska99615USA
| | - Daniel D. Roby
- Department of Fisheries and Wildlife Oregon State University 104 Nash Hall Corvallis Oregon97331USA
| | - John F. Piatt
- Alaska Science Center US Geological Survey 4210 University Drive Anchorage Alaska99508USA
| | - William H. Pyle
- U.S. Fish and Wildlife ServiceKodiak National Wildlife Refuge 1390 Buskin River Road Kodiak Alaska99615USA
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19
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Albo-Puigserver M, Sánchez S, Coll M, Bernal M, Sáez-Liante R, Navarro J, Palomera I. Year-round energy dynamics of sardine and anchovy in the north-western Mediterranean Sea. MARINE ENVIRONMENTAL RESEARCH 2020; 159:105021. [PMID: 32662445 DOI: 10.1016/j.marenvres.2020.105021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 05/16/2020] [Accepted: 05/17/2020] [Indexed: 06/11/2023]
Abstract
Variability in body condition and energy storage has important implications for fish recruitment and ecosystem structure. Understanding strategies for energy allocation to maintenance, reproduction and growth is essential to evaluate the state of the fish stocks. In this study, we address the energetics dynamics of the annual cycle of anchovies (Engraulis encrasicolus) and sardines (Sardina pilchardus) in the north-western Mediterranean Sea using indirect and direct condition indices. We assessed and validated the use of morphometric, biochemical and energetic indices for both species. Annual patterns of the relative condition index (Kn), gonadosomatic index (GSI), lipid content (% lipids) and energy density (ED) were linked to the energy allocation strategy. Our results highlight that anchovy mainly rely on income energy to reproduce, while sardine accumulate the energy during the resting period to be used in the reproduction period. Consequently, variability in the lipid content and ED between seasons was lower in anchovy than in sardine. In both species, we observed an early decline in energy reserves in late summer-early fall, which may be related to unfavourable environmental conditions during spring and summer. Regarding the use of different condition indices, both direct indices, lipid content and ED, were highly correlated with Kn for sardine. ED was better correlated with Kn than lipid content for anchovy. For the first time, a relationship between ED of gonads and GSI for sardine and anchovy was provided, highlighting the importance of the energy invested in reproduction. This work provides new insights into the energy dynamics of sardine and anchovy. We also demonstrate which are the most suitable indices to measure changes in the physiological condition of both species, providing tools for the future monitoring of the populations of these two commercially and ecologically important fish species.
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Affiliation(s)
| | - Sonia Sánchez
- School of Biological Sciences, Monash University, Clayton, Victoria, 3800, Australia
| | - Marta Coll
- Institut de Ciències Del Mar (ICM-CSIC), 08003, Barcelona, Spain
| | - Miguel Bernal
- Centro Oceanográfico de Cádiz, Instituto Español de Oceanografía, 11006, Cádiz, Spain
| | | | - Joan Navarro
- Institut de Ciències Del Mar (ICM-CSIC), 08003, Barcelona, Spain
| | - Isabel Palomera
- Institut de Ciències Del Mar (ICM-CSIC), 08003, Barcelona, Spain
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20
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Weil J, Trudel M, Tucker S, Brodeur RD, Juanes F. Percent ash-free dry weight as a robust method to estimate energy density across taxa. Ecol Evol 2019; 9:13244-13254. [PMID: 31871642 PMCID: PMC6912885 DOI: 10.1002/ece3.5775] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 09/09/2019] [Accepted: 10/03/2019] [Indexed: 12/04/2022] Open
Abstract
Determining how energy flows through ecosystems reveals underlying ecological patterns that drive processes such as growth and food web dynamics. Models that assess the transfer of energy from producers to consumers require information on the energy content or energy density (ED) of prey species. ED is most accurately measured through bomb calorimetry, but this method suffers from limitations of cost, time, and sample requirements that often make it unrealistic for many studies. Percent dry weight (DW) is typically used as a proxy for ED, but this measure includes an indigestible portion (e.g., bones, shell, salt) that can vary widely among organisms. Further, several distinct models exist for various taxonomic groups, yet none can accurately estimate invertebrate, vertebrate and plant ED with a single equation. Here, we present a novel method to estimate the ED of organisms using percent ash-free dry weight (AFDW). Using data obtained from 11 studies diverse in geographic, temporal and taxonomic scope, AFDW, DW as well as percent protein and percent lipid were compared as predictors of ED. Linear models were produced on a logarithmic scale, including dummy variables for broad taxonomic groups. AFDW was the superior predictor of ED compared to DW, percent protein content and percent lipid content. Model selection revealed that using correction factors (dummy variables) for aquatic animals (AA) and terrestrial invertebrates (TI) produced the best-supported model-log10(ED) = 1.07*log10(AFDW) - 0.80 (R 2 = 0.978, p < .00001)-with an intercept adjustment of 0.09 and 0.04 for AA and TI, respectively. All models including AFDW as a predictor had high predictive power (R 2 > 0.97), suggesting that AFDW can be used with high degrees of certainty to predict the ED of taxonomically diverse organisms. Our AFDW model will allow ED to be determined with minimal cost and time requirements and excludes ash-weight from estimates of digestible mass. Its ease of use will allow for ED to be more readily and accurately determined for diverse taxa across different ecosystems.
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Affiliation(s)
- Jacob Weil
- Department of BiologyUniversity of VictoriaVictoriaBCCanada
| | - Marc Trudel
- Department of BiologyUniversity of VictoriaVictoriaBCCanada
- St. Andrews Biological StationFisheries and Oceans CanadaSt. AndrewsNBCanada
| | - Strahan Tucker
- Pacific Biological StationFisheries and Oceans CanadaNanaimoBCCanada
| | - Richard D. Brodeur
- National Marine Fisheries ServiceNorthwest Fisheries Science Center, NOAANewportORUSA
| | - Francis Juanes
- Department of BiologyUniversity of VictoriaVictoriaBCCanada
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21
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Yoon GR, Deslauriers D, Anderson WG. Influence of a dynamic rearing environment on development of metabolic phenotypes in age-0 Lake Sturgeon, Acipenser fulvescens. CONSERVATION PHYSIOLOGY 2019; 7:coz055. [PMID: 31620291 PMCID: PMC6788496 DOI: 10.1093/conphys/coz055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 06/04/2019] [Accepted: 07/11/2019] [Indexed: 05/31/2023]
Abstract
Environment-phenotype interactions are the most pronounced during early life stages and can strongly influence metabolism and ultimately ecological fitness. In the present study, we examined the effect of temperature [ambient river temperature (ART) vs ART+2°C], dissolved oxygen (DO; 100% vs 80%) and substrate (presence vs absence) on standard metabolic rate, forced maximum metabolic rate and metabolic scope with Fulton's condition factor (K), energy density (ED) and critical thermal maximum (CTmax) in age-0 Lake Sturgeon, Acipenser fulvescens, before and after a simulated overwintering event. We found that all the environmental variables strongly influenced survival, K, ED and CTmax. Fish reared in elevated temperature showed higher mortality and reduced K pre-winter at 127 days post-hatch (dph). Interestingly, we did not find any significant difference in terms of metabolic rate between treatments at both sampling points of pre- and post-winter. Long-term exposure to 80% DO reduced ED in Lake Sturgeon post-winter at 272 dph. Our data suggest that substrate should be removed at the onset of exogenous feeding to enhance the survival rate of age-0 Lake Sturgeon in the first year of life. Effects of early rearing environment during larval development on survival over winter are discussed with respect to successful recruitment of stock enhanced Lake Sturgeon, a species that is at risk throughout its natural range.
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Affiliation(s)
- Gwangseok R Yoon
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - David Deslauriers
- Freshwater Institute, Fisheries and Oceans Canada, Winnipeg, MB R3T 2N6, Canada
| | - W Gary Anderson
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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22
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Faletti ME, Chacin DH, Peake JA, MacDonald TC, Stallings CD. Population dynamics of Pinfish in the eastern Gulf of Mexico (1998-2016). PLoS One 2019; 14:e0221131. [PMID: 31437179 PMCID: PMC6705858 DOI: 10.1371/journal.pone.0221131] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 07/30/2019] [Indexed: 11/18/2022] Open
Abstract
Forage fishes play an important role in marine ecosystems by transferring energy and nutrients through the food web. The population dynamics of forage species can therefore have cascading effects across multiple trophic levels. Here, we analyzed a 19-year dataset on Pinfish (Lagodon rhomboides) across four eastern Gulf of Mexico estuaries to investigate population dynamics, inter- and intra-annual synchrony, metapopulation portfolio effects, growth, and habitat effects. Young-of-year growth rates did not differ among estuaries. The population dynamics of these four systems were stable in the long-term, but highly dynamic inter-annually. Intra-annual dynamics were stable and predictable despite variation in long-term means. Some estuaries exhibited positive inter-annual synchrony, and all four estuaries were synchronous intra-annually. There was evidence for stronger portfolio effects for the entire four-estuary metapopulation, as well as for the two northern estuaries while the southern estuaries appeared to act as a single population. Submerged aquatic vegetation was by far the most important predictor for both presence and abundance of Pinfish. It is important to understand the factors driving forage fish population fluctuations to better predict ecosystem effects, including those to species of economic and ecological importance. These predictors can be useful for the implementation of ecosystem-based management decisions.
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Affiliation(s)
- Meaghan E. Faletti
- College of Marine Science, University of South Florida, St. Petersburg, FL, United States of America
- * E-mail:
| | - Dinorah H. Chacin
- College of Marine Science, University of South Florida, St. Petersburg, FL, United States of America
| | - Jonathan A. Peake
- College of Marine Science, University of South Florida, St. Petersburg, FL, United States of America
| | - Timothy C. MacDonald
- Fish and Wildlife Research Institute, Florida Fish and Wildlife Conservation Commission, St. Petersburg, FL, United States of America
| | - Christopher D. Stallings
- College of Marine Science, University of South Florida, St. Petersburg, FL, United States of America
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El Oudiani S, Chetoui I, Darej C, Moujahed N. Sex and seasonal variation in proximate composition and fatty acid profile of Scomber scombrus (L. 1758) fillets from the Middle East Coast of Tunisia. GRASAS Y ACEITES 2019. [DOI: 10.3989/gya.0235181] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This study investigates the impact of season and sex variations on the total lipid contents and fatty acid composition of Scomber scombrus fillets from the Middle East Coast of Tunisia in order to dertermine the most favorable periods for consumption, and to see if the nutritional quality of the meat depends on the sex of the animal. The effect of fishing season induced significant changes in the lipid profile, and the highest values for total lipids were obtained in the spring for females with 13.2% and for males with 18.9%. The highest values for proteins were obtained in the summer for females with 22.0% and for males with 21.8%. Protein content variations were not significant (p > 0.05). The n-3/n-6 ratio showed a significant level, indicating a tendency toward n-3 fatty acid accumulation in mackerel fillets mainly represented by DHA, whose values were high during the study period for both sexes, except in autumun, which is the period of mackerel gonad maturation, when DHA decreased significantly (p < 0.05), reaching 23.2 and 34.0% for males and females, respectively. It was concluded that Scomber scombrus has high levels of proteins, lipids, and fatty acid contents mainly n-3 PUFA. DHA sex variations were not significant (p > 0.05). The Atherogenicity index (AI) and Thrombogenicity index (TI) were calculated. In our study the AI index was comprised between 0.3 and 0.6 for males and between 0.4 and 0.5 for females. The TI index values ranged from 0.6 to 0.8 for males, and was about 0.6 for females.
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Schaafsma FL, Cherel Y, Flores H, van Franeker JA, Lea MA, Raymond B, van de Putte AP. Review: the energetic value of zooplankton and nekton species of the Southern Ocean. MARINE BIOLOGY 2018; 165:129. [PMID: 30100628 PMCID: PMC6061478 DOI: 10.1007/s00227-018-3386-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 07/05/2018] [Indexed: 06/02/2023]
Abstract
Understanding the energy flux through food webs is important for estimating the capacity of marine ecosystems to support stocks of living resources. The energy density of species involved in trophic energy transfer has been measured in a large number of small studies, scattered over a 40-year publication record. Here, we reviewed energy density records of Southern Ocean zooplankton, nekton and several benthic taxa, including previously unpublished data. Comparing measured taxa, energy densities were highest in myctophid fishes (ranging from 17.1 to 39.3 kJ g-1 DW), intermediate in crustaceans (7.1 to 25.3 kJ g-1 DW), squid (16.2 to 24.0 kJ g-1 DW) and other fish families (14.8 to 29.9 kJ g-1 DW), and lowest in jelly fish (10.8 to 18.0 kJ g-1 DW), polychaetes (9.2 to 14.2 kJ g-1 DW) and chaetognaths (5.0-11.7 kJ g-1 DW). Data reveals differences in energy density within and between species related to size, age and other life cycle parameters. Important taxa in Antarctic food webs, such as copepods, squid and small euphausiids, remain under-sampled. The variability in energy density of Electrona antarctica was likely regional rather than seasonal, although for many species with limited data it remains difficult to disentangle regional and seasonal variability. Models are provided to estimate energy density more quickly using a species' physical parameters. It will become increasingly important to close knowledge gaps to improve the ability of bioenergetic and food web models to predict changes in the capacity of Antarctic ecosystems to support marine life.
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Affiliation(s)
- Fokje L. Schaafsma
- Wageningen Marine Research, Ankerpark 27, 1781 AG Den Helder, The Netherlands
| | - Yves Cherel
- Centre d’Etudes Biologiques de Chizé, UMR 7372 du CNRS et de l’Université de La Rochelle, 79360 Villiers-en-Bois, France
| | - Hauke Flores
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung, Am Handeshafen 12, 27570 Bremerhaven, Germany
| | | | - Mary-Anne Lea
- Institute for Marine and Antarctic Studies, University of Tasmania, 20 Castray Esplanade, Battery Point, Hobart, TAS 7004 Australia
| | - Ben Raymond
- Institute for Marine and Antarctic Studies, University of Tasmania, 20 Castray Esplanade, Battery Point, Hobart, TAS 7004 Australia
- Australian Antarctic Division, Department of the Environment and Energy, 203 Channel Highway, Kingston, TAS 7050 Australia
- Antarctic and Climate Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, TAS 7001 Australia
| | - Anton P. van de Putte
- Royal Belgian Institute of Natural Sciences, Vautierstraat 29, 1000 Brussels, Belgium
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Herring supports Northeast Pacific predators and fisheries: Insights from ecosystem modelling and management strategy evaluation. PLoS One 2018; 13:e0196307. [PMID: 29979718 PMCID: PMC6034797 DOI: 10.1371/journal.pone.0196307] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 04/10/2018] [Indexed: 12/02/2022] Open
Abstract
This paper analyzes the trophic role of Pacific herring, the potential consequences of its depletion, and the impacts of alternative herring fishing strategies on a Northeast Pacific food web in relation to precautionary, ecosystem-based management. We used an Ecopath with Ecosim ecosystem model parameterized for northern British Columbia (Canada), employing Ecosim to simulate ecosystem effects of herring stock collapse. The ecological impacts of various herring fishing strategies were investigated with a Management Strategy Evaluation algorithm within Ecosim, accounting for variability in climatic drivers and stock assessment errors. Ecosim results suggest that herring stock collapse would have cascading impacts on much of the pelagic food web. Management Strategy Evaluation results indicate that herring and their predators suffer moderate impacts from the existing British Columbia harvest control rule, although more precautionary management strategies could substantially reduce these impacts. The non-capture spawn-on-kelp fishery, traditionally practiced by many British Columbia and Alaska indigenous peoples, apparently has extremely limited ecological impacts. Our simulations also suggest that adopting a maximum sustainable yield management strategy in Northeast Pacific herring fisheries could generate strong, cascading food web effects. Furthermore, climate shifts, especially when combined with herring stock assessment errors, could strongly reduce the biomasses and resilience of herring and its predators. By clarifying the trophic role of Pacific herring, this study aims to facilitate precautionary fisheries management via evaluation of alternative fishing strategies, and thereby to inform policy tradeoffs among multiple ecological and socioeconomic factors.
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Tengku-Rozaina TM, Shu Jeng W, Amiza MA. Nutritional Composition and Thermal Properties of Goldstripe Sardinella (Sardinella gibbosa) Fillets and By-Products. JOURNAL OF AQUATIC FOOD PRODUCT TECHNOLOGY 2018. [DOI: 10.1080/10498850.2018.1483991] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
| | - Wong Shu Jeng
- School of Food Science and Technology, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu, Malaysia
| | - Mat Amin Amiza
- School of Food Science and Technology, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu, Malaysia
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27
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Energy allocation and feeding ecology of juvenile chum salmon (Oncorhynchus keta) during transition from freshwater to saltwater. Polar Biol 2018. [DOI: 10.1007/s00300-018-2297-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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McNicholl DG, Davoren GK, Majewski AR, Reist JD. Isotopic niche overlap between co-occurring capelin (Mallotus villosus) and polar cod (Boreogadus saida) and the effect of lipid extraction on stable isotope ratios. Polar Biol 2017. [DOI: 10.1007/s00300-017-2199-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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29
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Falardeau M, Bouchard C, Robert D, Fortier L. First records of Pacific sand lance (Ammodytes hexapterus) in the Canadian Arctic Archipelago. Polar Biol 2017. [DOI: 10.1007/s00300-017-2141-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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30
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Reproductive success is energetically linked to foraging efficiency in Antarctic fur seals. PLoS One 2017; 12:e0174001. [PMID: 28453563 PMCID: PMC5409505 DOI: 10.1371/journal.pone.0174001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 03/01/2017] [Indexed: 11/29/2022] Open
Abstract
The efficiency with which individuals extract energy from their environment defines their survival and reproductive success, and thus their selective contribution to the population. Individuals that forage more efficiently (i.e., when energy gained exceeds energy expended) are likely to be more successful at raising viable offspring than individuals that forage less efficiently. Our goal was to test this prediction in large long-lived mammals under free-ranging conditions. To do so, we equipped 20 lactating Antarctic fur seals (Arctocephalus gazella) breeding on Kerguelen Island in the Southern Ocean with tags that recorded GPS locations, depth and tri-axial acceleration to determine at-sea behaviours and detailed time-activity budgets during their foraging trips. We also simultaneously measured energy spent at sea using the doubly-labeled water (DLW) method, and estimated the energy acquired while foraging from 1) type and energy content of prey species present in scat remains, and 2) numbers of prey capture attempts determined from head acceleration. Finally, we followed the growth of 36 pups from birth until weaning (of which 20 were the offspring of our 20 tracked mothers), and used the relative differences in body mass of pups at weaning as an index of first year survival and thus the reproductive success of their mothers. Our results show that females with greater foraging efficiencies produced relatively bigger pups at weaning. These mothers achieved greater foraging efficiency by extracting more energy per minute of diving rather than by reducing energy expenditure. This strategy also resulted in the females spending less time diving and less time overall at sea, which allowed them to deliver higher quality milk to their pups, or allowed their pups to suckle more frequently, or both. The linkage we demonstrate between reproductive success and the quality of individuals as foragers provides an individual-based quantitative framework to investigate how changes in the availability and accessibility of prey can affect fitness of animals.
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31
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Steingass S, Horning M. Individual-based energetic model suggests bottom up mechanisms for the impact of coastal hypoxia on Pacific harbor seal (Phoca vitulina richardii) foraging behavior. J Theor Biol 2017; 416:190-198. [PMID: 28082128 DOI: 10.1016/j.jtbi.2017.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 12/20/2016] [Accepted: 01/04/2017] [Indexed: 10/20/2022]
Abstract
Wind-driven coastal hypoxia represents an environmental stressor that has the potential to drive redistribution of gilled marine organisms, and thereby indirectly affect the foraging characteristics of air-breathing upper trophic-level predators. We used a conceptual individual-based model to simulate effects of coastal hypoxia on the spatial foraging behavior and efficiency of a marine mammal, the Pacific harbor seal (Phoca vitulina richardii) on the Oregon coast. Habitat compression of fish was simulated at varying intensities of hypoxia. Modeled hypoxia affected up to 80% of the water column and half of prey species' horizontal habitat. Pacific sand lance (Ammodytes hexapterus), Pacific herring (Clupea pallasii), and English sole (Parophrys vetulus) were selected as representative harbor seal prey species. Model outputs most affected by coastal hypoxia were seal travel distance to foraging sites, time spent at depth during foraging dives, and daily energy balance. For larger seals, English sole was the most optimal prey during normoxia, however during moderate to severe hypoxia Pacific sand lance was the most beneficial prey. For smaller seals, Pacific herring was the most efficient prey species during normoxia, but sand lance became more efficient as hypoxia increased. Sand lance represented the highest increase in foraging efficiency during severe hypoxic events for all seals. Results suggest that during increasing hypoxia, smaller adult harbor seals could benefit by shifting from foraging on larger neritic schooling fishes to foraging closer inshore on less energetically-dense forage fish. Larger adult seals may benefit by shifting from foraging on groundfish to smaller, schooling neritic fishes as hypoxia increases. The model suggests a mechanism by which hypoxia may result in increased foraging efficiency of Pacific harbor seals, and therefore increased rates of predation on coastal fishes on the continental shelf during hypoxic events.
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Affiliation(s)
- Sheanna Steingass
- Department of Fisheries and Wildlife, Marine Mammal Institute, Oregon State University, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, OR, USA.
| | - Markus Horning
- Department of Fisheries and Wildlife, Marine Mammal Institute, Oregon State University, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, OR, USA; Alaska SeaLife Center, 301 Railway Ave, Seward, AK 99644, USA
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Davenport J. Crying a river: how much salt-laden jelly can a leatherback turtle really eat? J Exp Biol 2017; 220:1737-1744. [DOI: 10.1242/jeb.155150] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 02/20/2017] [Indexed: 11/20/2022]
Abstract
Leatherback turtles (Dermochelys coriacea) are capital breeders that accumulate blubber (33 kJ g wet mass−1) by hyperphagia on a gelatinous diet at high latitudes; they breed in the tropics. A jellyfish diet is energy-poor (0.1–0.2 kJ g wet mass−1), so leatherbacks must ingest large quantities. Two published estimates of feeding rate (50% body mass d−1 (on Rhizostoma pulmo), 73% body mass d−1 (on Cyanea capillata)) have been criticised as too high. Jellyfish have high salt and water contents that must be removed to access organic material and energy. Most salt is removed (as NaCl) by paired lachrymal salt glands. Divalent ions are lost via the gut. In this study the size of adult salt glands (0.622 kg for a 450kg turtle; relatively 3 times the size of salt glands in cheloniid turtles) is measured for the first time by CT scanning. Various published values for leatherback field metabolic rate (FMR), body fluid composition and likely blubber accumulation rates are combined with known jellyfish salt, water and organic compositions to calculate feasible salt gland secretion rates and feeding rates. The results indicate that leatherbacks can produce about 10–15 ml secretion g salt gland mass−1 h−1 (tear osmolality 1800 mOsm kg−1). This will permit consumption of 80 % body mass d−1 of Cyanea capillata. Calculations suggest that leatherbacks will find it difficult/impossible to accumulate sufficient blubber for reproduction in a single feeding season. Rapid jellyfish digestion and short gut transit times are essential.
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Affiliation(s)
- John Davenport
- School of Biological, Earth and Environmental Sciences, University College Cork, North Mall Campus, Distillery Fields, Cork, Ireland
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Lamb JS, O'Reilly KM, Jodice PGR. Physical condition and stress levels during early development reflect feeding rates and predict pre- and post-fledging survival in a nearshore seabird. CONSERVATION PHYSIOLOGY 2016; 4:cow060. [PMID: 27957336 PMCID: PMC5146687 DOI: 10.1093/conphys/cow060] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 10/27/2016] [Accepted: 11/02/2016] [Indexed: 06/06/2023]
Abstract
The effects of acute environmental stressors on reproduction in wildlife are often difficult to measure because of the labour and disturbance involved in collecting accurate reproductive data. Stress hormones represent a promising option for assessing the effects of environmental perturbations on altricial young; however, it is necessary first to establish how stress levels are affected by environmental conditions during development and whether elevated stress results in reduced survival and recruitment rates. In birds, the stress hormone corticosterone is deposited in feathers during the entire period of feather growth, making it an integrated measure of background stress levels during development. We tested the utility of feather corticosterone levels in 3- to 4-week-old nestling brown pelicans (Pelecanus occidentalis) for predicting survival rates at both the individual and colony levels. We also assessed the relationship of feather corticosterone to nestling body condition and rates of energy delivery to nestlings. Chicks with higher body condition and lower corticosterone levels were more likely to fledge and to be resighted after fledging, whereas those with lower body condition and higher corticosterone levels were less likely to fledge or be resighted after fledging. Feather corticosterone was also associated with intracolony differences in survival between ground and elevated nest sites. Colony-wide, mean feather corticosterone predicted nest productivity, chick survival and post-fledging dispersal more effectively than did body condition, although these relationships were strongest before fledglings dispersed away from the colony. Both reproductive success and nestling corticosterone were strongly related to nutritional conditions, particularly meal delivery rates. We conclude that feather corticosterone is a powerful predictor of reproductive success and could provide a useful metric for rapidly assessing the effects of changes in environmental conditions, provided pre-existing baseline variation is monitored and understood.
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Affiliation(s)
- Juliet S. Lamb
- Department of Forestry and Environmental Conservation, and South Carolina Cooperative Fish and Wildlife Research Unit, G-27 Lehotsky Hall, Clemson University, Clemson, SC 29634, USA
| | - Kathleen M. O'Reilly
- Department of Biology, University of Portland, 5000 N Willamette Boulevard, Portland, OR 97203, USA
| | - Patrick G. R. Jodice
- US Geological Survey South Carolina Cooperative Fish and Wildlife Research Unit, and Department of Forestry and Environmental Conservation, G-27 Lehotsky Hall, Clemson, SC 29634, USA
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Xu JL, Riccioli C, Sun DW. Development of an alternative technique for rapid and accurate determination of fish caloric density based on hyperspectral imaging. J FOOD ENG 2016. [DOI: 10.1016/j.jfoodeng.2016.06.007] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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Latitudinal dependence of body condition, growth rate, and stable isotopes of juvenile capelin (Mallotus villosus) in the Bering and Chukchi Seas. Polar Biol 2016. [DOI: 10.1007/s00300-016-2041-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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36
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Hückstädt LA, Tift MS, Riet-Sapriza F, Franco-Trecu V, Baylis AMM, Orben RA, Arnould JPY, Sepulveda M, Santos-Carvallo M, Burns JM, Costa DP. Regional variability in diving physiology and behavior in a widely distributed air-breathing marine predator, the South American sea lion (Otaria byronia). ACTA ACUST UNITED AC 2016; 219:2320-30. [PMID: 27247316 DOI: 10.1242/jeb.138677] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 05/17/2016] [Indexed: 11/20/2022]
Abstract
Our understanding of how air-breathing marine predators cope with environmental variability is limited by our inadequate knowledge of their ecological and physiological parameters. Because of their wide distribution along both coasts of the sub-continent, South American sea lions (Otaria byronia) provide a valuable opportunity to study the behavioral and physiological plasticity of a marine predator in different environments. We measured the oxygen stores and diving behavior of South American sea lions throughout most of its range, allowing us to demonstrate that diving ability and behavior vary across its range. We found no significant differences in mass-specific blood volumes of sea lions among field sites and a negative relationship between mass-specific oxygen storage and size, which suggests that exposure to different habitats and geographical locations better explains oxygen storage capacities and diving capability in South American sea lions than body size alone. The largest animals in our study (individuals from Uruguay) were the shallowest and shortest duration divers, and had the lowest mass-specific total body oxygen stores, while the deepest and longest duration divers (individuals from southern Chile) had significantly larger mass-specific oxygen stores, despite being much smaller animals. Our study suggests that the physiology of air-breathing diving predators is not fixed, but that it can be adjusted, to a certain extent, depending on the ecological setting and or habitat. These adjustments can be thought of as a 'training effect': as the animal continues to push its physiological capacity through greater hypoxic exposure, its breath-holding capacity increases.
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Affiliation(s)
- Luis A Hückstädt
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Long Marine Laboratory, 100 Shaffer Road, Santa Cruz, CA 95060, USA
| | - Michael S Tift
- Scripps Institution of Oceanography, University of California San Diego, Center for Marine Biodiversity and Biomedicine, 8655 Kennel Way, La Jolla, CA 92037, USA
| | - Federico Riet-Sapriza
- Laboratorio de Ecologia Molecular de Vertebrados Acuaticos (LEMVA), Departamento de Ciencias Biologicas, Facultad de Ciencias, Universidad de Los Andes, Carrera 1E, #18A-10, Bogota, Colombia
| | - Valentina Franco-Trecu
- Departamento de Ecología y Evolución Facultad de Ciencias, Universidad de la República, Iguá 4225 Esq. Mataojo C.P, 11400 Montevideo, Uruguay
| | - Alastair M M Baylis
- South Atlantic Environmental Research Institute, Stanley FIQQ1ZZ, Falkland Islands School of Life and Environmental Sciences, Deakin University, Warrnambool Campus, Geelong, Australia
| | - Rachael A Orben
- Hatfield Marine Science Center, Oregon State University, 2030 SE Marine Science Drive, Newport, OR 97365, USA
| | - John P Y Arnould
- School of Life and Environmental Sciences, Deakin University, Burwood Campus, Geelong, Australia
| | - Maritza Sepulveda
- Centro de Investigación y Gestión en Recursos Naturales (CIGREN), Instituto de Biología, Facultad de Ciencias, Universidad de Valparaíso, Avenida Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile
| | - Macarena Santos-Carvallo
- Centro de Investigación y Gestión en Recursos Naturales (CIGREN), Instituto de Biología, Facultad de Ciencias, Universidad de Valparaíso, Avenida Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile
| | - Jennifer M Burns
- Department of Biological Sciences, University of Alaska Anchorage. 3211 Providence Drive Anchorage, AK 99508, USA
| | - Daniel P Costa
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Long Marine Laboratory, 100 Shaffer Road, Santa Cruz, CA 95060, USA
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Hellmann JK, Ligocki IY, O'Connor CM, Reddon AR, Farmer TM, Marsh-Rollo SE, Balshine S, Hamilton IM. The influence of status and the social environment on energy stores in a social fish. JOURNAL OF FISH BIOLOGY 2016; 88:1321-1334. [PMID: 26840014 DOI: 10.1111/jfb.12890] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 09/04/2015] [Accepted: 11/17/2015] [Indexed: 06/05/2023]
Abstract
This study explores how muscle and liver energy stores are linked with social status and the social environment in Neolamprologus pulcher, a cooperatively breeding fish that lives in colonies comprised of up to 200 distinct social groups. Subordinate muscle energy stores were positively correlated with the number of neighbouring social groups in the colony, but this pattern was not observed in dominant N. pulcher. Furthermore, liver energy stores were smaller in dominants living at the edge of the colony compared with those living in the colony centre, with no differences among subordinates in liver energy stores. Subordinate N. pulcher may build up large energy stores in the muscles to fuel rapid growth after dispersal, which could occur more frequently in high-density environments. Dominant N. pulcher may use the more easily mobilized energy stores in the liver to fuel daily activities, which could be more energetically demanding on the edge of the colony as a result of the increased predation defence needed on the edge. Overall, this study demonstrates that both subordinate and dominant physiology in N. pulcher varies with characteristics of the social environment. Furthermore, dominant and subordinate energy storage strategies appear to differ due to status-dependent variation in daily activities and variation in the need to prepare for future reproductive or dispersal opportunities.
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Affiliation(s)
- J K Hellmann
- Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, 318 West 12th Avenue, Columbus, OH, 43210, U.S.A
| | - I Y Ligocki
- Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, 318 West 12th Avenue, Columbus, OH, 43210, U.S.A
| | - C M O'Connor
- Aquatic Behavioural Ecology Lab, Department of Psychology, Neuroscience, and Behaviour, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada
| | - A R Reddon
- Aquatic Behavioural Ecology Lab, Department of Psychology, Neuroscience, and Behaviour, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada
- Department of Mathematics, The Ohio State University, 231 West 18th Avenue, Columbus, OH, 43210, U.S.A
| | - T M Farmer
- Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, 318 West 12th Avenue, Columbus, OH, 43210, U.S.A
| | - S E Marsh-Rollo
- Aquatic Behavioural Ecology Lab, Department of Psychology, Neuroscience, and Behaviour, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada
| | - S Balshine
- Aquatic Behavioural Ecology Lab, Department of Psychology, Neuroscience, and Behaviour, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada
| | - I M Hamilton
- Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, 318 West 12th Avenue, Columbus, OH, 43210, U.S.A
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Pereira LS, Agostinho AA, Delariva RL. Effects of river damming in Neotropical piscivorous and omnivorous fish: feeding, body condition and abundances. NEOTROPICAL ICHTHYOLOGY 2016. [DOI: 10.1590/1982-0224-20150044] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT The increase in abundance of small-sized fishes is common after a reservoir is formed. There is an increase in the consumption of fish, from typically piscivorous fish to opportunistic species that take advantage of abundant resources. This study aims to evaluate the effects of diet changes induced by damming on the feeding activity and condition factor of typically piscivorous (Hoplias aff. malabaricus and Oligosarcus longirostris ) and opportunistic (Astyanax lacustris (ex Astyanax altiparanae ) and Pimelodus britskii ). Sampling was conducted before and after the impoundment in the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Stomach contents were analysed by the volumetric method. Feeding activity and body condition were inferred by the mean stomach repletion index and the mean condition factor. Typically piscivorous species presented a general tendency of decreased feeding activity and increased condition factor, while opportunistic species, presented a decrease in condition and feeding activity in the most affected sites. The increase in the condition factor of piscivorous fish suggests that these species benefit by the increased abundance of small size prey fish. Some opportunist species that do not have adjustments for the piscivorous diet, regardless of the intensity of consumption and resource availability, can suffer negative reflex when adopting a piscivorous diet.
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Daly EA, Brodeur RD. Warming Ocean Conditions Relate to Increased Trophic Requirements of Threatened and Endangered Salmon. PLoS One 2015; 10:e0144066. [PMID: 26675673 PMCID: PMC4682959 DOI: 10.1371/journal.pone.0144066] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/12/2015] [Indexed: 11/18/2022] Open
Abstract
The trophic habits, size and condition of yearling Chinook salmon (Oncorhynchus tshawytscha) caught early in their marine residence were examined during 19 survey years (1981–1985; 1998–2011). Juvenile salmon consumed distinct highly piscivorous diets in cold and warm ocean regimes with major differences between ocean regimes driven by changes in consumption of juvenile rockfishes, followed by several other fish prey, adult euphausiids and decapod larvae. Notable, Chinook salmon consumed 30% more food in the warm versus cold ocean regime in both May and June. Additionally, there were about 30% fewer empty stomachs in the warm ocean regime in May, and 10% fewer in warm June periods. The total prey energy density consumed during the warmer ocean regime was also significantly higher than in cold. Chinook salmon had lower condition factor and were smaller in fork length during the warm ocean regime, and were longer and heavier for their size during the cold ocean regime. The significant increase in foraging during the warm ocean regime occurred concurrently with lower available prey biomass. Adult return rates of juvenile Chinook salmon that entered the ocean during a warm ocean regime were lower. Notably, our long term data set contradicts the long held assertion that juvenile salmon eat less in a warm ocean regime when low growth and survival is observed, and when available prey are reduced. Comparing diet changes between decades under variable ocean conditions may assist us in understanding the effects of projected warming ocean regimes on juvenile Chinook salmon and their survival in the ocean environment. Bioenergetically, the salmon appear to require more food resources during warm ocean regimes.
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Affiliation(s)
- Elizabeth A. Daly
- Cooperative Institution for Marine Resources Studies, Oregon State University, Newport, Oregon, United States of America
- * E-mail:
| | - Richard D. Brodeur
- Fish Ecology Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Newport, Oregon, United states of America
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Carroll JM, O'Shaughnessy KA, Diedrich GA, Finelli CM. Are oysters being bored to death? Influence of Cliona celata on Crassostrea virginica condition, growth and survival. DISEASES OF AQUATIC ORGANISMS 2015; 117:31-44. [PMID: 26575154 DOI: 10.3354/dao02928] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The boring sponge Cliona celata is a nuisance species that can have deleterious effects on eastern oyster Crassostrea virginica growth, condition, and survival. Surprisingly, however, these effects have not been well documented and when examined, results have been equi-vocal. In this study, we provide a direct comparison of growth, condition, and survival of sponge-colonized and uncolonized oysters in southeast North Carolina in 2 separate experiments. In the first experiment, sponge-colonized oysters exhibited significantly slower growth rates, reduced condition, and lower survival relative to uncolonized oysters, although results may have been confounded by oyster source. In the second experiment, using smaller oysters from the same source population, growth rate was again significantly reduced in colonized oysters relative to uncolonized oysters, however neither condition nor survival differed. In field surveys of the same population, colonized individuals across a range of sizes demonstrated significantly reduced condition. Further, condition index was negatively correlated with sponge biomass, which was positively correlated with oyster size, suggesting that the impact of the sponge changes with ontogeny. By investigating clearance rates, tissue isotopic and nutrient content, as well as caloric value, this study provides further evidence that sponge presence causes the oysters to divert energy into costly shell maintenance and repair at the expense of shell and somatic growth. Thus, although variable, our results demonstrate negative impacts of sponge infestation on oyster demographics, particularly as oysters grow larger.
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Affiliation(s)
- John M Carroll
- Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC 28403, USA
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Ontogenetic and spatial variability in trophic biomarkers of juvenile saffron cod (Eleginus gracilis) from the Beaufort, Chukchi and Bering Seas. Polar Biol 2015. [DOI: 10.1007/s00300-015-1792-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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42
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Under-ice distribution of polar cod Boreogadus saida in the central Arctic Ocean and their association with sea-ice habitat properties. Polar Biol 2015. [DOI: 10.1007/s00300-015-1774-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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43
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Sinclair EH, Walker WA, Thomason JR. Body Size Regression Formulae, Proximate Composition and Energy Density of Eastern Bering Sea Mesopelagic Fish and Squid. PLoS One 2015; 10:e0132289. [PMID: 26287534 PMCID: PMC4545836 DOI: 10.1371/journal.pone.0132289] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Accepted: 06/11/2015] [Indexed: 11/18/2022] Open
Abstract
The ecological significance of fish and squid of the mesopelagic zone (200 m-1000 m) is evident by their pervasiveness in the diets of a broad spectrum of upper pelagic predators including other fishes and squids, seabirds and marine mammals. As diel vertical migrators, mesopelagic micronekton are recognized as an important trophic link between the deep scattering layer and upper surface waters, yet fundamental aspects of the life history and energetic contribution to the food web for most are undescribed. Here, we present newly derived regression equations for 32 species of mesopelagic fish and squid based on the relationship between body size and the size of hard parts typically used to identify prey species in predator diet studies. We describe the proximate composition and energy density of 31 species collected in the eastern Bering Sea during May 1999 and 2000. Energy values are categorized by body size as a proxy for relative age and can be cross-referenced with the derived regression equations. Data are tabularized to facilitate direct application to predator diet studies and food web models.
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Affiliation(s)
- Elizabeth H. Sinclair
- National Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic Atmospheric Administration, Seattle, Washington, United States of America
- * E-mail:
| | - William A. Walker
- National Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic Atmospheric Administration, Seattle, Washington, United States of America
| | - James R. Thomason
- National Marine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic Atmospheric Administration, Seattle, Washington, United States of America
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Wolf N, Newsome SD, Peters J, Fogel ML. Variability in the routing of dietary proteins and lipids to consumer tissues influences tissue-specific isotopic discrimination. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2015; 29:1448-1456. [PMID: 26147485 DOI: 10.1002/rcm.7239] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 04/27/2015] [Accepted: 05/26/2015] [Indexed: 06/04/2023]
Abstract
RATIONALE The eco-physiological mechanisms that govern the incorporation and routing of macronutrients from dietary sources into consumer tissues determine the efficacy of stable isotope analysis (SIA) for studying animal foraging ecology. We document how changes in the relative amounts of dietary proteins and lipids affect the metabolic routing of these macronutrients and the consequent effects on tissue-specific discrimination factors in domestic mice using SIA. We also examine the effects of dietary macromolecular content on a commonly used methodological approach: lipid extraction of potential food sources. METHODS We used carbon ((13) C) and nitrogen ((15) N) isotopes to examine the routing of carbon from dietary proteins and lipids that were used by mice to biosynthesize hair, blood, muscle, and liver. Growing mice were fed one of four diet treatments in which the total dietary content of C4 -based lipids (δ(13) C = -14.5‰) and C(3) -based proteins (δ(13) C = -27‰) varied inversely between 5% and 40%. RESULTS The δ(13) C values of mouse tissues increased by approximately 2-6‰ with increasing dietary lipid content. The difference in δ(13) C values between mouse tissues and bulk diet ranged from 0.1 ± 1.5‰ to 2.3 ± 0.6‰ for all diet treatments. The mean (±SD) difference between the δ(13) C values of mouse tissues and dietary protein varied systematically among tissues and ranged from 3.1 ± 0.1‰ to 4.5 ± 0.6‰ for low fat diets and from 5.4 ± 0.4‰ to 10.5 ± 7.3‰ for high fat diets. CONCLUSIONS Mice used some fraction of their dietary lipid carbon to synthesize tissue proteins, suggesting flexibility in the routing of dietary macromolecules to consumer tissues based on dietary macromolecular availability. Consequently, all constituent dietary macromolecules, not just protein, should be considered when determining the relationship between diets and consumer tissues using SIA. In addition, in cases where animals consume diets with high lipid contents, non lipid-extracted prey samples should be analyzed to estimate diets using SIA.
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Affiliation(s)
- Nathan Wolf
- Fairweather Science LLC, Anchorage, AK, 99515, USA
| | - Seth D Newsome
- University of New Mexico, Department of Biology, Albuquerque, NM, 87131, USA
| | - Jacob Peters
- Harvard University, Organismic and Evolutionary Biology, Cambridge, MA, 02138, USA
| | - Marilyn L Fogel
- University of California Merced, Environmental Sciences, Merced, CA, 95343, USA
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Yurkowski DJ, Ferguson SH, Semeniuk CAD, Brown TM, Muir DCG, Fisk AT. Spatial and temporal variation of an ice-adapted predator's feeding ecology in a changing Arctic marine ecosystem. Oecologia 2015. [PMID: 26210748 DOI: 10.1007/s00442-015-3384-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Spatial and temporal variation can confound interpretations of relationships within and between species in terms of diet composition, niche size, and trophic position (TP). The cause of dietary variation within species is commonly an ontogenetic niche shift, which is a key dynamic influencing community structure. We quantified spatial and temporal variations in ringed seal (Pusa hispida) diet, niche size, and TP during ontogeny across the Arctic-a rapidly changing ecosystem. Stable carbon and nitrogen isotope analysis was performed on 558 liver and 630 muscle samples from ringed seals and on likely prey species from five locations ranging from the High to the Low Arctic. A modest ontogenetic diet shift occurred, with adult ringed seals consuming more forage fish (approximately 80 versus 60 %) and having a higher TP than subadults, which generally decreased with latitude. However, the degree of shift varied spatially, with adults in the High Arctic presenting a more restricted niche size and consuming more Arctic cod (Boreogadus saida) than subadults (87 versus 44 %) and adults at the lowest latitude (29 %). The TPs of adult and subadult ringed seals generally decreased with latitude (4.7-3.3), which was mainly driven by greater complexity in trophic structure within the zooplankton communities. Adult isotopic niche size increased over time, likely due to the recent circumpolar increases in subarctic forage fish distribution and abundance. Given the spatial and temporal variability in ringed seal foraging ecology, ringed seals exhibit dietary plasticity as a species, suggesting adaptability in terms of their diet to climate change.
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Affiliation(s)
- David J Yurkowski
- Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON, N9B 3P4, Canada.
| | - Steven H Ferguson
- Freshwater Institute, Fisheries and Oceans Canada, Winnipeg, MB, R3T 2N6, Canada.
| | - Christina A D Semeniuk
- Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON, N9B 3P4, Canada.
| | - Tanya M Brown
- Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC, V8W 3P6, Canada.
| | - Derek C G Muir
- Aquatic Ecosystem Protection Research Division, Environment Canada, Burlington, ON, L7R 4A6, Canada.
| | - Aaron T Fisk
- Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON, N9B 3P4, Canada.
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Albeke SE, Nibbelink NP, Ben-David M. Modeling Behavior by Coastal River Otter (Lontra Canadensis) in Response to Prey Availability in Prince William Sound, Alaska: A Spatially-Explicit Individual-Based Approach. PLoS One 2015; 10:e0126208. [PMID: 26061497 PMCID: PMC4489515 DOI: 10.1371/journal.pone.0126208] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 03/30/2015] [Indexed: 11/18/2022] Open
Abstract
Effects of climate change on animal behavior and cascading ecosystem responses are rarely evaluated. In coastal Alaska, social river otters (Lontra Canadensis), largely males, cooperatively forage on schooling fish and use latrine sites to communicate group associations and dominance. Conversely, solitary otters, mainly females, feed on intertidal-demersal fish and display mutual avoidance via scent marking. This behavioral variability creates "hotspots" of nutrient deposition and affects plant productivity and diversity on the terrestrial landscape. Because the abundance of schooling pelagic fish is predicted to decline with climate change, we developed a spatially-explicit individual-based model (IBM) of otter behavior and tested six scenarios based on potential shifts to distribution patterns of schooling fish. Emergent patterns from the IBM closely mimicked observed otter behavior and landscape use in the absence of explicit rules of intraspecific attraction or repulsion. Model results were most sensitive to rules regarding spatial memory and activity state following an encounter with a fish school. With declining availability of schooling fish, the number of social groups and the time simulated otters spent in the company of conspecifics declined. Concurrently, model results suggested an elevation of defecation rate, a 25% increase in nitrogen transport to the terrestrial landscape, and significant changes to the spatial distribution of "hotspots" with declines in schooling fish availability. However, reductions in availability of schooling fish could lead to declines in otter density over time.
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Affiliation(s)
- Shannon E. Albeke
- Wyoming Geographic Information Science Center, University of Wyoming, Laramie, Wyoming, United States of America
- * E-mail:
| | - Nathan P. Nibbelink
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, Georgia, United States of America
| | - Merav Ben-David
- Department of Zoology and Physiology, University of Wyoming, Laramie, Wyoming, United States of America
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Dawson NM, Bishop MA, Kuletz KJ, Zuur AF. Using Ships of Opportunity to Assess Winter Habitat Associations of Seabirds in Subarctic Coastal Alaska. NORTHWEST SCIENCE 2015. [DOI: 10.3955/046.089.0203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Tollit D, Wong M, Trites A. Diet composition of Steller sea lions (Eumetopias jubatus) in Frederick Sound, southeast Alaska: a comparison of quantification methods using scats to describe temporal and spatial variabilities. CAN J ZOOL 2015. [DOI: 10.1139/cjz-2014-0292] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We compared eight dietary indices used to describe the diet of Steller sea lions (Eumetopias jubatus (Schreber, 1776)) from 2001 to 2004 in Frederick Sound, southeast Alaska. Remains (n = 9666 items) from 59+ species categories were identified from 1684 fecal samples (scats) from 14 collection periods. The most frequently occurring prey were walleye pollock (Theragra chalcogramma (Pallas, 1814) = Gadus chalcogrammus Pallas, 1814; 95%), Pacific herring (Clupea pallasii Valenciennes in Cuvier and Valenciennes, 1847; 30%), Pacific hake (Merluccius productus (Ayres, 1855); 29%), and arrowtooth flounder (Atheresthes stomias (Jordan and Gilbert, 1880) = Reinhardtius stomias (Jordan and Gilbert, 1880); 21%). These species, along with Pacific salmon (genus Oncorhynchus Suckley, 1861) and skate (genus Raja L., 1758), accounted for 80%–90% of the reconstructed biomass and energy contribution, with pollock contributing 37%–60%. Overall, 80% of fish were 14–42 cm long and mainly pelagic, though 40% of scats contained benthic-associated prey. Steller sea lions switched from adult pollock to strong cohorts of juvenile pollock, and took advantage of spawning concentrations of salmon in autumn and herring in late spring and summer, as well as a climate-driven increase in hake availability. Observed temporal and site differences in diet confirm the need for robust long-term scat sampling protocols. All major indices similarly tracked key temporal changes, despite differences in occurrence and biomass-energy-based diet estimates linked to prey size and energy-density effects and the application of correction factors.
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Affiliation(s)
- D.J. Tollit
- Marine Mammal Research Unit, Fisheries Centre, The University of British Columbia, Room 247, AERL, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
- Marine Mammal Research Unit, Fisheries Centre, The University of British Columbia, Room 247, AERL, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - M.A. Wong
- Marine Mammal Research Unit, Fisheries Centre, The University of British Columbia, Room 247, AERL, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
- Marine Mammal Research Unit, Fisheries Centre, The University of British Columbia, Room 247, AERL, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - A.W. Trites
- Marine Mammal Research Unit, Fisheries Centre, The University of British Columbia, Room 247, AERL, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
- Marine Mammal Research Unit, Fisheries Centre, The University of British Columbia, Room 247, AERL, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
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Blight LK, Hobson KA, Kyser TK, Arcese P. Changing gull diet in a changing world: a 150-year stable isotope (δ13C, δ15N) record from feathers collected in the Pacific Northwest of North America. GLOBAL CHANGE BIOLOGY 2015; 21:1497-507. [PMID: 25369474 DOI: 10.1111/gcb.12796] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 09/24/2014] [Indexed: 05/06/2023]
Abstract
The world's oceans have undergone significant ecological changes following European colonial expansion and associated industrialization. Seabirds are useful indicators of marine food web structure and can be used to track multidecadal environmental change, potentially reflecting long-term human impacts. We used stable isotope (δ(13)C, δ(15)N) analysis of feathers from glaucous-winged gulls (Larus glaucescens) in a heavily disturbed region of the northeast Pacific to ask whether diets of this generalist forager changed in response to shifts in food availability over 150 years, and whether any detected change might explain long-term trends in gull abundance. Sampled feathers came from birds collected between 1860 and 2009 at nesting colonies in the Salish Sea, a transboundary marine system adjacent to Washington, USA and British Columbia, Canada. To determine whether temporal trends in stable isotope ratios might simply reflect changes to baseline environmental values, we also analysed muscle tissue from forage fishes collected in the same region over a multidecadal timeframe. Values of δ(13)C and δ(15)N declined since 1860 in both subadult and adult gulls (δ(13)C, ~ 2-6‰; δ(15)N, ~4-5‰), indicating that their diet has become less marine over time, and that birds now feed at a lower trophic level than previously. Conversely, forage fish δ(13)C and δ(15)N values showed no trends, supporting our conclusion that gull feather values were indicative of declines in marine food availability rather than of baseline environmental change. Gradual declines in feather isotope values are consistent with trends predicted had gulls consumed less fish over time, but were equivocal with respect to whether gulls had switched to a more garbage-based diet, or one comprising marine invertebrates. Nevertheless, our results suggest a long-term decrease in diet quality linked to declining fish abundance or other anthropogenic influences, and may help to explain regional population declines in this species and other piscivores.
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Affiliation(s)
- Louise K Blight
- Centre for Applied Conservation Research, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada; Procellaria Research & Consulting, 944 Dunsmuir Road, Victoria, BC, V9A 5C3, Canada
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50
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Newsome SD, Wolf N, Peters J, Fogel ML. Amino Acid 13C Analysis Shows Flexibility in the Routing of Dietary Protein and Lipids to the Tissue of an Omnivore. Integr Comp Biol 2014; 54:890-902. [DOI: 10.1093/icb/icu106] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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