Isotopic effects of different preservation methods on scales of olive ridley sea turtles (<i>Lepidochelys olivacea</i>) from the Mexican Central Pacific

Carpena-Catoira, Carla; Ortega‐Ortiz, Christian D.; Elorriaga‐Verplancken, Fernando R.

doi:10.1002/rcm.7737

Cited by 4 publications

(4 citation statements)

References 21 publications

(20 reference statements)

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“…Samples were wrapped in previously sterilized aluminum foil inside a plastic cryogenic vial and placed in a liquid nitrogen container for preservation. Other samples such as skin from coastal spotted dolphins ( Stenella attenuata graffmani ), humpback whale ( Megaptera novaeangliae ) calves and adults, scales from olive ridley sea turtles ( Lepidochelys olivacea ; Carpena‐Catoira, Ortega‐Ortiz, & Elorriaga‐Verplancken, 2016), and muscle from the caudal peduncle of several fish species (obtained from local fishermen), were also sampled and preserved using the same methods in order to analyze their potential role as KW prey (Table 1).…”

Section: Figurementioning

confidence: 99%

Ecological aspects of killer whales from the Mexican Central Pacific coast: Revealing a new ecotype in the Eastern Tropical Pacific

Vargas-Bravo

Elorriaga‐Verplancken

Olivos-Ortíz

et al. 2020

Marine Mammal Science

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The killer whale (KW, Orcinus orca) is the most cosmopolitan species among cetaceans (Bryun, Tosh, & Terauds, 2012;Heyning & Dahlheim, 1988), showing a unique global population genetic structure among nonhuman species (Foote et al., 2019). Its widespread distribution, along with its top predator status (Mehta et al., 2007), make it a good indicator of alterations in the marine trophic structure (Moore, 2008). Although the KW has been extensively studied over the past several decades, it is still classified as "Data deficient" in the Red List of the International Union for Conservation of Nature, as many populations are still scarcely known (Reeves, Pitman, & Ford, 2017).

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Section: Figurementioning

confidence: 99%

Ecological aspects of killer whales from the Mexican Central Pacific coast: Revealing a new ecotype in the Eastern Tropical Pacific

Vargas-Bravo

Elorriaga‐Verplancken

Olivos-Ortíz

et al. 2020

Marine Mammal Science

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“…Almost all focused on loggerhead and/or green turtle tissues (e.g. Kaufman et al 2014, Bergamo et al 2016 with only one study looking at olive ridley tissues (Carpena-Catoira et al 2016). Similarly, all focused on the effect of these techniques only on C and N isotopes.…”

Section: Sample Preservation And/or Preparationmentioning

confidence: 99%

Realignment of sea turtle isotope studies needed to match conservation priorities

Pearson¹,

Merwe²,

Limpus³

et al. 2017

Mar. Ecol. Prog. Ser.

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Stable isotope analyses have become popular in sea turtle literature over the past decade, with an increasing year-to-year trend in published studies reporting insights into food web structure, diet, trophic interactions, ontogenetic shifts, geographic distributions, and more. Understanding the geographic distribution of migrating taxa within their sub-populations could enhance conservation and management, especially for threatened populations. For sea turtles, stable isotope analyses can potentially be used to quickly assess foraging distributions across large proportions of a nesting population, examining high numbers of turtles at low cost and/or effort relative to satellite telemetry and mark−recapture studies. We systematically assessed the literature, aiming to identify the current state of research into sea turtle isotope ecology, including key knowledge gaps and the level of geographic assessment within regional management units (RMUs). Sea turtle RMUs listed as Least Concern by the IUCN (6.5 studies per RMU) have been studied at a rate 13 times higher than those considered Threatened (0.5 studies per RMU). Loggerhead turtles Caretta caretta and green turtles Chelonia mydas are the most studied species. Comparatively, flatback Natator depressus and Kemp's ridley Lepidochelys kempii turtles return a paucity of analyses. This is the first review of sea turtle isotope studies and helps to refocus future isotope research to prioritise conservation outcomes throughout the world. The mismatch between effort and conservation priority may be a testimony to the effectiveness of research and management in these areas but suggests a need to now realign the focus of sea turtle isotope ecological studies towards more threatened RMUs.KEY WORDS: Conservation · Marine turtle · Megafauna · Sea turtle · Stable isotope · Tracking · 13 C · 15 N Resale or republication not permitted without written consent of the publisher Editorial responsibility: Graeme Hays,

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“…Isotope ratios of marine turtle tissue change with decomposition (Payo-Payo et al 2013), therefore tissues must be preserved. However, the preservation of samples, including blood anticoagulants, has been shown to significantly affect isotope ratios (Barrow et al 2008, Lemons et al 2012, Kaufman et al 2014, Carpena-Catoira et al 2016. We re commend a standardised preservation technique should be implemented for each tissue type in future research, although we understand logistical reasons could restrict what techniques are used.…”

Section: Key Recommendationsmentioning

confidence: 99%

“…This was also recommended by Newsome et al (2010) for SIA in marine mammals. Carpena-Catoira et al (2016) recommend the storage of epidermis in dimethyl sulfoxide (DMSO) buffer when storage in liquid nitrogen is not possible; however, these authors only compare these two preservation methods. Barrow et al (2008) found DMSO affects epidermis isotope ratios whilst ethanol does not.…”

Section: Key Recommendationsmentioning

confidence: 99%

Global review and inventory: how stable isotopes are helping us understand ecology and inform conservation of marine turtles

Haywood¹,

Fuller²,

Godley³

et al. 2019

Mar. Ecol. Prog. Ser.

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Isotopic effects of different preservation methods on scales of olive ridley sea turtles (Lepidochelys olivacea) from the Mexican Central Pacific

Cited by 4 publications

References 21 publications

Ecological aspects of killer whales from the Mexican Central Pacific coast: Revealing a new ecotype in the Eastern Tropical Pacific

Ecological aspects of killer whales from the Mexican Central Pacific coast: Revealing a new ecotype in the Eastern Tropical Pacific

Realignment of sea turtle isotope studies needed to match conservation priorities

Global review and inventory: how stable isotopes are helping us understand ecology and inform conservation of marine turtles

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