A matter of taste: Spatial and ontogenetic variations on the trophic ecology of the tiger shark at the Galapagos Marine Reserve

English version

Autoři: Pelayo Salinas-de-León ^aff001; Denisse Fierro-Arcos ^aff001; Jennifer Suarez-Moncada ^aff003; Alberto Proaño ^aff003; Jacob Guachisaca-Salinas ^aff004; Diego Páez-Rosas ^aff003
Působiště autorů: Charles Darwin Research Station, Charles Darwin Foundation, Puerto Ayora, Galapagos Islands, Ecuador ^aff001; Pristine Seas, National Geographic Society, Washington, DC, United States of America ^aff002; Galapagos National Park, Puerto Ayora, Galapagos Islands, Ecuador ^aff003; Facultad de Ciencias Naturales, Universidad de Guayaquil, Guayaquil, Ecuador ^aff004; Universidad San Francisco de Quito, Galapagos Science Center, Isla San Cristóbal, Galapagos Islands, Ecuador ^aff005
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0222754

Souhrn

Sharks are top predators across ocean food webs and have a major ecological role in marine ecosystems. Investigating the trophic ecology of this group of species is thus essential to understand ecosystem functioning and inform specific management actions aimed at shark conservation. The Galapagos Islands represent one of the last ocean wildernesses, where populations of sharks and other top marine predators come close to a pristine status. Here we provide the first study on the trophic ecology of the tiger shark (Galeocerdo cuvier) within the Galapagos Marine Reserve (GMR), using a combination of stable isotope analysis, satellite tracking, and passive acoustic telemetry to investigate ontogenetic and spatial variations at two regions. The mean estimated δ¹³C and δ¹⁵N at Isabela island (western region) were -13.9 ± 0.5‰ and 13.7 ± 0.7‰; and for Santa Cruz island (central region) were -13.8 ± 0.3‰ and 13.4 ± 0.7‰, respectively. Green sea turtles (Chelonia mydas) were the main prey item for large tiger sharks (>280 cm TL), while smaller sharks mainly fed on squid and pelagic fish. Tiger sharks exhibited a high degree of philopatry around green sea-turtle nesting areas, with the majority of sharks detected around green sea-turtle nesting areas for at least 10 months after their capture date, and some individuals were even present during the entire three-year study period. Although we did not report statistically significant differences between the two regions, isotopic and electronic tagging data suggest that tiger sharks in the Galapagos could be segregated into specific populations separated by geographical scales of <100 km. The high productivity of the archipelago, along with the protection from industrial fishing granted by the GMR, result in abundant and predictable sources of prey. This high food abundance, combined with the presence of suitable habitats throughout the tiger shark life cycle, might result in a reduction of migratory behaviours when compared to movement patterns of tiger sharks in other ocean basins. Additional studies using genetic tools could provide further evidence on the presence of separate management units, as it has been recently revealed for other shark species inhabiting the GMR.

Klíčová slova:

Biology and life sciences – Organisms – Eukaryota – Animals – Vertebrates – Fish – Chondrichthyes – Elasmobranchii – Sharks – Amniotes – Reptiles – Testudines – Turtles – Ecology – Community ecology – Trophic interactions – Predation – Marine ecology – Marine biology – Earth sciences – Geomorphology – Topography – Landforms – Islands – Marine and aquatic sciences – Ecology and environmental sciences – Physical sciences – Physics – Acoustics – Mathematics – Geometry – Ellipses

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A matter of taste: Spatial and ontogenetic variations on the trophic ecology of the tiger shark at the Galapagos Marine Reserve

Souhrn

Klíčová slova:

Zdroje

PLOS One

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