Trophic niches of sympatric tropical tuna in the Western Indian Ocean inferred by stable isotopes and neutral fatty acids

Sardenne, Fany; Bodin, Nathalie; Chassot, Emmanuel; Amiel, Aurélien; Fouché, Edwin; Degroote, Maxime; Hollanda, Stéphanie; Pethybridge, Heidi; Lebreton, Benoît; Guillou, Gaël; Ménard, Frédéric

doi:10.1016/j.pocean.2016.06.001

Cited by 49 publications

(46 citation statements)

References 64 publications

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“…The relatively low lipid concentrations in white muscle (<5% of wet mass) have been observed previously (Medina et al ., ; Saito et al ., ; Bodin et al ., ; Sardenne et al ., , ). Thus, K. pelamis can be defined as a lean fish.…”

Section: Discussionmentioning

confidence: 99%

“…Income breeding allows for high investments to be made in reproduction when the resources are available (Kjesbu, 2009;Saborido-Rey et al, 2010) and consequently the abundance of food influences reproductive timing (Bye, 1984;Bapary et al, 2012). Responding to this reproductive strategy, K. pelamis in the western Indian Ocean have evolved to match their spawning season to monsoon periods where food availability is high (Roger, 1994;Schott et al, 2002;Potier et al, 2008;Sardenne et al, 2016a), evidenced by the regular periods of intense sexual activity observed during the north-east and south-west monsoons (Stéquert & Ramcharrun, 1996;Stéquert et al, 2001;Grande et al, 2014). This strategy has already been described in large tropical pelagic fishes, for example, T. albacares, where feeding and spawning activities were observed to occur in the same time and area strata (McPherson, 1991;Itano, 2000;Bard et al, 2002;Zudaire et al, 2013b;Sardenne et al, 2016a).…”

Section: Discussionmentioning

confidence: 99%

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Energy allocation strategy of skipjack tuna Katsuwonus pelamis during their reproductive cycle

Grande

Murua

Zudaire

et al. 2016

Journal of Fish Biology

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The lipid composition of somatic and reproductive tissues was determined for female skipjack tuna Katsuwonus pelamis caught in the western Indian Ocean between latitude 10° N and 20° S and longitude 40° and 70° E. The highest total lipid (TL) contents were in the liver and gonads, with white muscle levels approximately three-fold lower. Three lipid classes dominated: triacylglycerols (TAG), sterol esters and wax esters (SE-WE) and phospholipids (PL). Collectively, these accounted for between 70 and 80% of TLs. Changes in lipid concentrations were evaluated over the maturation cycle. Immature fish had the lowest gonad and liver TL levels; concentrations of TL, TAG, SE-WE and PL accumulated from immature to mature (spawning-capable) phase, reflecting sustained vitellogenic activity of the liver and a transfer of lipids to developing oocytes from the onset of vitellogenesis. Gonado-somatic and hepato-somatic indices were positively correlated with each other and positively related to TL in the gonads and liver. Fulton's condition index and lipid concentrations in muscle did not vary significantly over the maturation cycle; fat content in the main storage tissues was undepleted as the ovary developed. Hence, K. pelamis apparently supports reproduction directly from food intake over the breeding season. In the gonads, reserve lipids (SE-WE and TAG) and sterols were related to batch fecundity but this was not the case for somatic and hepatic tissues. These results suggest that K. pelamis utilizes an income breeding strategy.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Energy allocation strategy of skipjack tuna Katsuwonus pelamis during their reproductive cycle

Grande

Murua

Zudaire

et al. 2016

Journal of Fish Biology

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“…The highest trophic position of BET coincides with the δ 15 N values from the Indian Ocean: ca. 1 ‰ higher in BET than in YFT (Sardenne et al 2016). Stomach content analyses confirm this trend and shows that BET feeds more on high trophic level prey, such as squids, than YFT (Cherel et al 2007, Logan andLutcavage 2013).…”

Section: Large Overlap In the Tropical Tuna Feeding Nichesmentioning

confidence: 87%

“…In the highest trophic levels, transferred FA are better preserved in storage lipids than in structural lipids (Robin et al 2003, Budge et al 2012. The quantification of these ecological tracers also allows the estimation of feeding niche extent (niche space) and provides insights into resource partitioning (niche overlap) between co-occurring species (Jackson et al 2011, Layman et al 2012) including tunas (Teffer et al 2015, Sardenne et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Seasonal habitat and length influence on the trophic niche of co-occurring tropical tunas in the eastern Atlantic Ocean

Sardenne

Diaha

Amandé

et al. 2019

Can. J. Fish. Aquat. Sci.

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In the Gulf of Guinea, bigeye tuna (Thunnus obesus; BET) and yellowfin tuna (Thunnus albacares; YFT) are an important part of commercial fisheries and play a prominent ecological role as top predators. Using fatty acid profiles and carbon and nitrogen stable isotopes, we examined their trophic niche partitioning in this understudied region. Trophic niche overlap was high (>70%), similar to percentages in other ocean basins. BET occupied a higher trophic position than YFT and fed on deeper prey (high δ15N values and high proportions of monounsaturated fatty acids). The trophic position of YFT decreased slightly in the last 15 years (δ15N values decreased by ∼0.5‰), suggesting a change in epipelagic communities, as observed in the eastern Pacific Ocean. Ontogenic changes were limited to BET. For both species, the dietary proportion of the diatom marker 20:5(n-3) increased in the seasonal upwelling area, highlighting the influence of seasonal habitat on the diet of tuna. The relatively lipid-rich muscle (∼6% dry mass) of Atlantic tropical tuna suggests a richer diet in this region than that of Indian Ocean tropical tuna and (or) differences in energy allocation strategies.

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“…The trophic niche (i.e. combination of trophic level and feeding habitat) can be inferred through the use of both δ 15 N and δ 13 C (Sardenne et al, 2016) and has been shown to determine metal exposure for marine fish (Das et al, 2000;Le Croizier et al, 2016). The trophic niche influence on mercury contamination was here investigated on a single species with a sufficient number of individuals (n=10): the Atlantic bumper Chloroscombrus chrysurus.…”

Section: Intraspecific Variability Determines Hg Accumulationmentioning

confidence: 99%

Stable isotope analyses revealed the influence of foraging habitat on mercury accumulation in tropical coastal marine fish

Croizier

Schaal

Point

et al. 2019

Science of The Total Environment

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Bioaccumulation of toxic metal elements including mercury (Hg) can be highly variable in marine fish species. Metal concentration is influenced by various species-specific physiological and ecological traits, including individual diet composition and foraging habitat. The impact of trophic ecology and habitat preference on Hg accumulation was analyzed through total Hg concentration and stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) analyses in the muscle of 132 fish belonging to 23 different species from the Senegalese coast (West Africa), where the marine ecosystem is submitted to nutrients inputs from various sources such as upwelling or rivers. Species-specific ecological traits were first investigated and results showed that vertical (i.e. water column distribution) and horizontal habitat (i.e. distance from the coast) led to differential Hg accumulation among species. Coastal and demersal fish were more contaminated than offshore and pelagic species. Individual characteristics therefore revealed an increase of Hg concentration in muscle that paralleled trophic level for some locations. Considering all individuals, the main carbon source was significantly correlated with Hg concentration, again revealing a higher accumulation for fish foraging in nearshore and benthic habitats. The large intraspecific variability observed in stable isotope signatures highlights the need to conduct ecotoxicological studies at the individual level to ensure a thorough understanding of mechanisms driving metal accumulation in marine fish. For individuals from a same species and site, Hg variation was mainly explained by fish length, in accordance with the bioaccumulation of Hg over time. Finally, Hg concentrations in fish muscle are discussed regarding their human health impact. No individual exceeded the current maximum acceptable limit for seafood consumption set by both the European Union and the Food and Agriculture Organization of the United Nations. However, overconsumption of Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site. some coastal demersal species analyzed here could be of concern regarding human exposure to mercury.

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Trophic niches of sympatric tropical tuna in the Western Indian Ocean inferred by stable isotopes and neutral fatty acids

Cited by 49 publications

References 64 publications

Energy allocation strategy of skipjack tuna Katsuwonus pelamis during their reproductive cycle

Energy allocation strategy of skipjack tuna Katsuwonus pelamis during their reproductive cycle

Seasonal habitat and length influence on the trophic niche of co-occurring tropical tunas in the eastern Atlantic Ocean

Stable isotope analyses revealed the influence of foraging habitat on mercury accumulation in tropical coastal marine fish

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