Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve.
Changes in life-history requirements drive trophic variations, particularly in large marine predators. The life history of many shark species is still poorly known and understanding their dietary ontogeny is a challenging task, especially for highly migratory species. Stable isotope analysis has pro...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2022-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0268736 |
| _version_ | 1828787897870843904 |
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| author | Florencia Cerutti-Pereyra Pelayo Salinas-De-León Camila Arnés-Urgellés Jennifer Suarez-Moncada Eduardo Espinoza Leandro Vaca Diego Páez-Rosas |
| author_facet | Florencia Cerutti-Pereyra Pelayo Salinas-De-León Camila Arnés-Urgellés Jennifer Suarez-Moncada Eduardo Espinoza Leandro Vaca Diego Páez-Rosas |
| author_sort | Florencia Cerutti-Pereyra |
| collection | DOAJ |
| description | Changes in life-history requirements drive trophic variations, particularly in large marine predators. The life history of many shark species is still poorly known and understanding their dietary ontogeny is a challenging task, especially for highly migratory species. Stable isotope analysis has proven as a useful method for examining the foraging strategies of sharks and other marine predators. We assessed the foraging strategies and ontogenetic changes of scalloped hammerhead sharks, Sphyrna lewini, at Galapagos Marine Reserve (GMR), by analysing δ13C and δ15N signatures in different maturity stages. Our isotopic results suggest ontogenetic shifts in resource use between sub-adult and adult stages, but not between adult and juvenile stages. Carbon isotopic signatures found in the juvenile stage were enriched in contrast to sub-adults (~0.73‰) suggesting a combination of the maternal input and the use of coastal resources around the Galapagos Islands. Adult female sharks also showed enrichment in δ13C (~0.53‰) in comparison to sub-adult stages that suggest feeding in high primary productivity areas, such as the GMR. This study improves the understanding of the trophic ecology and ontogenetic changes of a highly migratory shark that moves across the protected and unprotected waters of the Eastern Tropical Pacific. |
| first_indexed | 2024-12-12T00:41:20Z |
| format | Article |
| id | doaj.art-91da42009c46433aaad162ead728b97d |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-12T00:41:20Z |
| publishDate | 2022-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-91da42009c46433aaad162ead728b97d2022-12-22T00:44:14ZengPublic Library of Science (PLoS)PLoS ONE1932-62032022-01-01176e026873610.1371/journal.pone.0268736Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve.Florencia Cerutti-PereyraPelayo Salinas-De-LeónCamila Arnés-UrgellésJennifer Suarez-MoncadaEduardo EspinozaLeandro VacaDiego Páez-RosasChanges in life-history requirements drive trophic variations, particularly in large marine predators. The life history of many shark species is still poorly known and understanding their dietary ontogeny is a challenging task, especially for highly migratory species. Stable isotope analysis has proven as a useful method for examining the foraging strategies of sharks and other marine predators. We assessed the foraging strategies and ontogenetic changes of scalloped hammerhead sharks, Sphyrna lewini, at Galapagos Marine Reserve (GMR), by analysing δ13C and δ15N signatures in different maturity stages. Our isotopic results suggest ontogenetic shifts in resource use between sub-adult and adult stages, but not between adult and juvenile stages. Carbon isotopic signatures found in the juvenile stage were enriched in contrast to sub-adults (~0.73‰) suggesting a combination of the maternal input and the use of coastal resources around the Galapagos Islands. Adult female sharks also showed enrichment in δ13C (~0.53‰) in comparison to sub-adult stages that suggest feeding in high primary productivity areas, such as the GMR. This study improves the understanding of the trophic ecology and ontogenetic changes of a highly migratory shark that moves across the protected and unprotected waters of the Eastern Tropical Pacific.https://doi.org/10.1371/journal.pone.0268736 |
| spellingShingle | Florencia Cerutti-Pereyra Pelayo Salinas-De-León Camila Arnés-Urgellés Jennifer Suarez-Moncada Eduardo Espinoza Leandro Vaca Diego Páez-Rosas Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve. PLoS ONE |
| title | Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve. |
| title_full | Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve. |
| title_fullStr | Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve. |
| title_full_unstemmed | Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve. |
| title_short | Using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the Galapagos Marine Reserve. |
| title_sort | using stable isotopes analysis to understand ontogenetic trophic variations of the scalloped hammerhead shark at the galapagos marine reserve |
| url | https://doi.org/10.1371/journal.pone.0268736 |
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