Isotopic niche and resource sharing among young sharks (Carcharodon carcharias and Isurus oxyrinchus) in Baja California, Mexico

Tamburin, Elena; Kim, Sora L.; Elorriaga‐Verplancken, Fernando R.; Madigan, Daniel J.; Hoyos-Padilla, Mauricio; Sánchez-González, Alberto; Hernández-Herrera, Agustı́n; Castillo‐Géniz, José Leonardo; Godinez-Padilla, Carlos Javier; Galván‐Magaña, Felipe

doi:10.3354/meps12884

Cited by 34 publications

(26 citation statements)

References 101 publications

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“…However, in terms of holistically examining trophic relationships and food‐web connectivity, stable‐isotope analysis (SIA) is more common (Bird et al ., ; Carlisle et al ., ; Carlisle & Starr, ). Typically, SIA relies on isotopes of nitrogen ( 15 N) and carbon ( 13 C) to examine patterns of ontogenetic change (Raoult et al ., ) or source contributions to diets (Tamburin et al ., ). Although of considerable utility, determining only two elemental tracers can limit the reliability of models and the number of sources that can be examined within a given model (Parnell et al ., ; ; Phillips et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Resource use of great hammerhead sharks (Sphyrna mokarran) off eastern Australia

Raoult

Broadhurst²,

Peddemors

et al. 2019

Journal of Fish Biology

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Great hammerhead sharks Sphyrna mokarran are the largest member of Sphyrnidae, yet the roles of these large sharks in the food webs of coastal ecosystems are still poorly understood. Here we obtained samples of muscle, liver and vertebrae from large S. mokarran (234-383 cm total length; L T ) caught as by-catch off eastern Australia and used stable-isotope analyses of δ 15 N, δ 13 C and δ 34 S to infer their resource use and any associated ontogenetic patterns. The results indicated large S. mokarran are apex predators primarily relying on other sharks and rays for their diet, with a preference for benthic resources such as Australian cownose rays Rhinoperon neglecta during the austral summer. Teleosts, cephalopods and crustaceans were not significant components of S. mokarran diets, though some conspecifics appeared to rely on more diverse resources over the austral summer. Ontogenetic shifts in resource use were detected but trajectories of the increases in trophic level varied among individuals. Most S. mokarran had non-linear trajectories in ontogenetic resource-use shifts implying size was not the main explanatory factor. Stable isotope values of δ 13 C and δ 34 S in muscle suggest S. mokarran span coastal, pelagic and benthic food webs in eastern Australia.

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Section: Introductionmentioning

confidence: 97%

Resource use of great hammerhead sharks (Sphyrna mokarran) off eastern Australia

Raoult

Broadhurst²,

Peddemors

et al. 2019

Journal of Fish Biology

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“…Scomber spp, Cynoscion spp., Tylosurus spp. Gonatidae spp; Preti et al, ; Velasco‐Tarelo, ; Tamburin et al, ). However, both predator species feed on relatively high trophic position prey and protein content (Amador‐Capitanachi et al, ; Juárez‐Ruiz et al, ; Rosas‐Luis, Navarro, Loor‐Andrade, & Forero, ; Velasco‐Tarelo, ), nevertheless they are very distant for the evolutive adaptations.…”

Section: Discussionmentioning

confidence: 99%

Isotopic variation in blood components based on their biochemistry and physiology: A comparison between sharks and fur seals

Tamburin¹,

Amador‐Capitanachi

Galván‐Magaña

et al. 2019

J Exp Zool Pt A

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Research using stable isotopes analysis (SIA) of carbon (δ 13 C) and nitrogen (δ 15 N) in blood components is lacking, because of the challenge of sample collection, processing, and storage in remote areas. There also is a paucity of information regarding the effect of tissue biochemical composition on isotopic ratios with few comparisons among taxa. We collected blood samples from shortfin mako sharks (n = 70; 2016) and Guadalupe fur seals (n = 25; 2017). All samples were centrifuged to obtain plasma from sharks and serum from the Guadalupe fur seals, and all the samples were prepared for SIA and analyzed using a Costech 4010 elemental analyzer interfaced with a Delta V Plus isotope ratio mass spectrometer. We found significant differences between plasma δ 13 C values of shortfin mako sharks (−17.6 ± 0.9‰) and serum of Guadalupe fur seals (−20.3 ± 1.2‰), but we did not find any differences for δ 15 N values between the two species. The differences in δ 13 C values between species are probably due to the specific blood composition and to the different biochemical characteristics and different adaptations within taxa. These findings highlight the importance of further research on the influence of biochemistry features on isotopic results, in this way a more accurate assessment will be possible for this factor, separating it from the dietary influences on stable isotopic values. K E Y W O R D Sbiochemical features, Guadalupe fur seals, plasma, serum, shortfin mako sharks, stable isotopes

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“…We obtained δ 13 C and δ 15 N data for WPO prey (muscle tissue) from five studies (Takai et al, 2007;Madigan et al, 2016;Ohshimo et al, 2016Ohshimo et al, , 2019Fujinami et al, 2018) for a total of 145 prey species, and obtained data for EPO prey from five studies (Madigan et al, 2012a;Miller et al, 2013;Choy et al, 2015;Hernández-Aguilar et al, 2015;Tamburin et al, 2019) for a total of 75 prey species. Prey species included the most commonly observed species in WPO and EPO blue shark diet (Preti et al, 2012;Hernández-Aguilar et al, 2015;Fujinami et al, 2018), including forage fish (anchovy Engraulis spp., sardine Sardinops spp., scombrids), squids (Ommastrephidae, Gonatidae, Oegopsidae), and crustaceans (red crab Pleuroncodes planipes), as well as other epi-and mesopelagic fish, squids, and crustaceans that have also been observed in blue shark diet (Preti et al, 2012;Hernández-Aguilar et al, 2015;Fujinami et al, 2018).…”

Section: Prey Si Datamentioning

confidence: 99%

Isotopic Tracers Suggest Limited Trans-Oceanic Movements and Regional Residency in North Pacific Blue Sharks (Prionace glauca)

et al. 2021

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Blue sharks (Prionace glauca) are globally distributed, large-bodied pelagic sharks that make extensive migrations throughout their range. In the North Pacific, mark-recapture studies have shown trans-Pacific migrations, but knowledge gaps in migration frequency hinder understanding of regional connectivity and assessments of regional demography for stock assessments. Here, we use oceanographic gradients of stable isotope ratios (i.e., regional isoscapes) to determine exchange rates of blue sharks between the East and West North Pacific Ocean (EPO and WPO). We generated regional δ13C and δ15N distributions for blue sharks from published values in the North Pacific (n = 180; both sexes, juveniles and adults combined). Discriminant analysis suggested low trans-Pacific exchange, categorizing all western (100%) and most eastern (95.3%) blue sharks as resident to their sampling region, with isotopic niche overlap of WPO and EPO highly distinct (0.01–5.6% overlap). Limited trans-Pacific movements suggest that other mechanisms maintain genetic mixing of the North Pacific blue shark population. Potential finer scale movement structure was indicated by isotopic differences in sub-regions of the eastern and western Pacific, though application of mixing models are currently limited by aberrantly low blue shark δ13C values across studies. Our results suggest that blue shark population dynamics may be effectively assessed on a regional basis (i.e., WPO and EPO). We recommend further studies to provide size- and sex-specific movement patterns based on empirical isotopic values with large sample sizes from targeted regions. Strategically applied stable isotope approaches can continue to elucidate migration dynamics of mobile marine predators, complementing traditional approaches to fisheries biology and ecology.

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Isotopic niche and resource sharing among young sharks (Carcharodon carcharias and Isurus oxyrinchus) in Baja California, Mexico

Cited by 34 publications

References 101 publications

Resource use of great hammerhead sharks (Sphyrna mokarran) off eastern Australia

Resource use of great hammerhead sharks (Sphyrna mokarran) off eastern Australia

Isotopic variation in blood components based on their biochemistry and physiology: A comparison between sharks and fur seals

Isotopic Tracers Suggest Limited Trans-Oceanic Movements and Regional Residency in North Pacific Blue Sharks (Prionace glauca)

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