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Free Content Nutritional composition of marine plants in the diet of the green sea turtle (Chelonia mydas) in the Hawaiian Islands

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In the hawaiian Islands, seaweeds and seagrasses are eaten by green turtles, Chelonia mydas Linnaeus. Sixteen macroalgal species (7 Chlorophyta, 2 Phaeophyta, 7 Rhodophyta), two seagrass species, and multi-specific algal turf from turtle foraging areas on four different islands were analyzed for proximate (protein, lipid, carbohydrate), water, ash, energy, amino acid, vitamin, and mineral content. Pterocladiella capillacea (Gmelin) Santelices and Hommersand, a prominent dietary item, and Rhizoclonium implexum (Dillwyn) K├╝tzing, an infrequently consumed species, ranked highest in total protein content. Most species contained < 10% crude lipid. Soluble carbohydrates ranged from 3.2%–39.9% dry weight. Ash values ranged from 13.7%–81.4% dry weight. Energy content of P. capillacea was over 14 kJ g−1 ash-free dry weight. All species tested contained measurable quantities of 11 minerals. Vitamin A (β-carotene) was detected in all marine plants tested; most contained Niacin (B3); and Enteromorpha flexuosa (Wulfen) J. Agardh had the highest amount of vitamin C (3 mg g−1). Samples contained measurable amounts of all essential amino acids, except for tryptophan. These data provide new information about Hawaiian green turtle feeding ecology and factors that may influence somatic growth rates.

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Document Type: Research Article

Publication date: 01 July 2007

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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