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• W2557631903 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 565:181-196 (2017) - DOI: https://doi.org/10.3354/meps11995 Niche metrics suggest euryhaline and coastal elasmobranchs provide trophic connections among marine and freshwater biomes in northern Australia Sharon L. Every1,2,3,*, Heidi R. Pethybridge4, Christopher J. Fulton3, Peter M. Kyne1, David A. Crook1 1Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory 0909, Australia 2North Australia Marine Research Alliance, Arafura-Timor Sea Research Facility, Brinkin, Northern Territory 0810, Australia 3Research School of Biology, The Australian National University, Canberra, Australian Capital Territory 2601, Australia 4Oceans and Atmosphere, Commonwealth Scientific and Industrial Research Organisation, Hobart, Tasmania 7000, Australia *Corresponding author: slevery2001@yahoo.com.au ABSTRACT: Tropical elasmobranchs could play significant roles in connecting coastal and river ecosystems, yet few studies have explored the trophic ecology of elasmobranch species that may link these biomes. We investigated the trophic niches of 7 such species in northern Australia during the tropical monsoonal wet and dry seasons, using stable carbon (δ13C) and nitrogen (δ15N) isotopes (SI), and fatty acid (FA) biomarkers taken from muscle tissue. Both SI and FA metrics suggested significant niche partitioning between species, with 2 distinct guilds: a marine food web based on epiphytes and seagrass (low δ13C), and an estuarine/freshwater food web with a seston base (higher δ13C). A large overlap in SI niche areas and higher mean trophic positions (4.1-4.8) were evident in species accessing marine diets (Carcharhinus leucas, Rhizoprionodon taylori) when compared with species predominantly feeding in estuaries (3.2-3.6; Glyphis garricki, G. glyphis). Across all seasons, G. garricki had the greatest FA niche space, and variable overlap with 2 other species (R. taylori, C. leucas). Although limited seasonal effects were apparent for individual FA biomarkers, SI niche metrics revealed greater niche areas and inter-specific partitioning during the dry season for 3 species. Subtle differences in niche metrics derived from SI and FAs were likely due to disparate turnover times, and the statistical approach of each metric (2-dimensional versus multi-dimensional). Collectively, our analyses suggest that these tropical coastal and euryhaline elasmobranchs consume prey from a range of sources to provide trophic connections across marine, estuarine and freshwater biomes. KEY WORDS: Niche metrics · Sharks · Glyphis · Carcharhinus · Rhizoprionodon · Biotracers · Stable isotopes · Fatty acids Full text in pdf format Supplementary material PreviousNextCite this article as: Every SL, Pethybridge HR, Fulton CJ, Kyne PM, Crook DA (2017) Niche metrics suggest euryhaline and coastal elasmobranchs provide trophic connections among marine and freshwater biomes in northern Australia. Mar Ecol Prog Ser 565:181-196. https://doi.org/10.3354/meps11995 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 565. Online publication date: February 17, 2017 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2017 Inter-Research." @default.
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• W2557631903 title "Niche metrics suggest euryhaline and coastal elasmobranchs provide trophic connections among marine and freshwater biomes in northern Australia" @default.
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• W2557631903 doi "https://doi.org/10.3354/meps11995" @default.
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