Food-web inferences of stable isotope spatial patterns in copepods and yellowfin tuna in the pelagic eastern Pacific Ocean

Olson, Robert J.; Popp, Brian N.; Graham, Brittany; López‐Ibarra, Gladis A.; Galván‐Magaña, Felipe; Lennert‐Cody, Cleridy E.; Bocanegra-Castillo, Noemí; Wallsgrove, Natalie J.; Gier, Elizabeth; Alatorre-Ramírez, Vanessa; Ballance, Lisa T.; Fry, Brian

doi:10.1016/j.pocean.2010.04.026

Cited by 120 publications

(129 citation statements)

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“…15 N values was observed between Yellowfin Tuna < 30 cm FL and those > 50 cm (t-test: P < 0.01); these results are consistent with those of the aforementioned studies (Graham et al 2007;Olson et al 2010).…”

Section: Stable Isotope Analysissupporting

confidence: 92%

“…Graham et al (2007) and Olson et al (2010) reported that the stable isotope values of Yellowfin Tuna tend to increase with an increase in body size. In this study, d…”

Section: Stable Isotope Analysismentioning

confidence: 99%

“…Therefore, the following equation was used to estimate the trophic position (TP) of Yellowfin Tuna (Vander Zanden and Rasmussen 1999;Olson et al 2010):…”

mentioning

confidence: 99%

“…The TEF is a suitable indicator for estimating the isotopic relationships between Yellowfin Tuna and their prey. As no stable isotope analysis has been performed for other tuna species or sharks in Taiwanese waters, the average TEF value of marine fishes (2.4%) has been used (Vanderklift and Ponsard 2003) when evaluating Yellowfin Tuna feeding habits (Olson et al 2010).…”

mentioning

confidence: 99%

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Feeding Ecology of Juvenile Yellowfin Tuna from Waters Southwest of Taiwan Inferred from Stomach Contents and Stable Isotope Analysis

et al. 2015

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The Yellowfin Tuna Thunnus albacares is one of the major fish species caught around subsurface fish aggregation devices (FADs) in the waters southwest of Taiwan. However, how it interacts with other organisms around FADs is poorly known. In this study, the diet and feeding habits of juvenile Yellowfin Tuna were estimated from the analysis of stomach contents from 1,477 specimens with FLs ranging from 24 to 108 cm and stable isotope analysis (202 specimens) collected around FADs in the waters southwest of Taiwan. The analysis of stomach contents indicated that juvenile Yellowfin Tuna with FL < 50 cm mainly feed on larval purpleback flying squid Sthenoteuthis oualaniensis, larval shrimps, and zooplanktonic organisms such as amphipods. Yellowfin Tuna with FL of ∼50 cm switch their diet to teleost fishes such as Japanese Barracudina Lestrolepis japonica, Skinnycheek Lanternfish Benthosema pterotum, and fishes in the families Exocoetidae and Scombridae. Stable isotope analysis indicated that the δ15N values ranged between 6.2‰ and 12.6‰, and the estimated trophic position varied from 3.18 ± 0.24 for tuna with FL < 30 cm, while it reached 4.59 ± 0.50 for those with FL > 50 cm and 4.75 ± 0.06 for those with FL > 90 cm. Based on the distinct diet shift of the juvenile Yellowfin Tuna, demonstrated by both stomach contents and stable isotope analyses, this study concluded that the tuna shift their diet at approximately 50 cm FL. Received March 31, 2015; accepted September 9, 2015

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Section: Stable Isotope Analysissupporting

confidence: 92%

“…Graham et al (2007) and Olson et al (2010) reported that the stable isotope values of Yellowfin Tuna tend to increase with an increase in body size. In this study, d…”

Section: Stable Isotope Analysismentioning

confidence: 99%

“…Therefore, the following equation was used to estimate the trophic position (TP) of Yellowfin Tuna (Vander Zanden and Rasmussen 1999;Olson et al 2010):…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Feeding Ecology of Juvenile Yellowfin Tuna from Waters Southwest of Taiwan Inferred from Stomach Contents and Stable Isotope Analysis

et al. 2015

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“…Stable carbon and nitrogen isotopic compositions have been used extensively to gain insights into foraging strategy, particularly for consumers whose behavior and dietary preferences are difficult to observe directly (Fry, 1988;Olson et al, 2010). δ 13 C and δ 15 N values vary across ecosystems and are tracers of metabolic and biogeochemical processes (Montoya, 2007).…”

Section: Introductionmentioning

confidence: 99%

Opportunism on the High Seas: Foraging Ecology of Olive Ridley Turtles in the Eastern Pacific Ocean

et al. 2017

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Large‐scale patterns of green turtle trophic ecology in the eastern Pacific Ocean

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et al. 2021

Ecosphere

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Trophic position and niche width are fundamental components of a species' ecology, reflecting resource use, and influencing key demographic parameters such as somatic growth, maturation, and survival. Concepts about a species' trophic niche space have important implications for local management and habitat protection, and can shed light about resilience to changing climate for species occurring over broad spatial scales. For elusive marine animals such as sea turtles, trophic niche is challenging to study, and researchers often rely on other metrics, such as isotopic niche, as a proxy. Here, stable isotope analysis (δ 13 C and δ 15 N values) was conducted on bulk skin tissue of 718 green turtles (Chelonia mydas) distributed among 16 foraging areas in the eastern Pacific from the USA to Chile, a range spanning~10,000 km. Compound-specific nitrogen isotope analysis of amino acids (CSIA-AA) was applied to 21 turtles among seven sites. Isotopic niche space was determined via Bayesian ellipse area (BEA) and convex hull area (CHA) analyses of bulk isotope values, which were also used along with amino acid δ 15 N values to determine trophic position (TP). Substantial variability in bulk tissue δ 13 C and δ 15 N values was found within and among sites, and amino acid δ 15 N values confirmed this was largely due to spatial differences in baseline nitrogen isotopic compositions, but also to a lesser extent from TP differences among the green turtle v www.esajournals.org 1 June 2021 v Volume 12(6) v Article e03479 foraging populations. Isotope niche space varied among sites, influenced by the diversity of prey types and relative input of terrestrial-vs. marine-derived nutrients; BEAs were the most suitable measurement of isotopic niche space due to the larger influence of outlying values with the CHA approach. Amino acid isotope-derived TP estimates that accounted for local habitat conditions (e.g., mixed seagrass/macroalgae diet) performed the best among several approaches; TP ranged from 2.3 to 3.6, which indicates an omnivorous diet for most populations. In addition to providing additional spatial resolution for δ 13 C and δ 15 N isoscapes in the eastern Pacific, especially in coastal habitats, this study further establishes CSIA-AA as an effective tool to study the trophic ecology of sea turtles across a variety of food webs and habitats.

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Food-web inferences of stable isotope spatial patterns in copepods and yellowfin tuna in the pelagic eastern Pacific Ocean

Cited by 120 publications

References 81 publications

Feeding Ecology of Juvenile Yellowfin Tuna from Waters Southwest of Taiwan Inferred from Stomach Contents and Stable Isotope Analysis

Feeding Ecology of Juvenile Yellowfin Tuna from Waters Southwest of Taiwan Inferred from Stomach Contents and Stable Isotope Analysis

Opportunism on the High Seas: Foraging Ecology of Olive Ridley Turtles in the Eastern Pacific Ocean

Large‐scale patterns of green turtle trophic ecology in the eastern Pacific Ocean

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