Abiotic and biotic drivers of fatty acid tracers in ecology: A global analysis of chondrichthyan profiles

被引:44
作者
Meyer, Lauren [1 ]
Pethybridge, Heidi [2 ]
Nichols, Peter D. [2 ]
Beckmann, Crystal [3 ]
Huveneers, Charlie [1 ]
机构
[1] Flinders Univ S Australia, Coll Sci & Engn, Southern Shark Ecol Grp, Bedford Pk, SA, Australia
[2] CSIRO Oceans & Atmosphere, Hobart, Tas, Australia
[3] SARDI Aquat Sci, West Beach, SA, Australia
关键词
biochemical tracer; fatty acid profile; food webs; habitat; ray; shark; trophic ecology; LONG-CHAIN; MUSCLE; SHARKS; LIPIDS; BIOMARKERS; DIET; METABOLISM; MICROALGAE; PREDATOR; BLUBBER;
D O I
10.1111/1365-2435.13328
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
1. The use of fatty acid (FA) tracers is a growing tool in trophic ecology, yet FA profiles are driven by a number of abiotic and biotic parameters, making interpretation and appropriate use confusing for ecologists. 2. We undertook a global analysis, compiling FA profiles of 106 chondrichthyan (shark, ray and chimaera) populations, as a model to test the utility of FA profiles to partition a priori trophic guilds, phylogeny, water temperature and habitats. Individual FAs characterizing these four factors were identified, promoting the use of these FAs as ecological tracers across taxa. 3. Habitat type was linked to five FAs: 16:0, 18:0 and biologically essential 22:6 omega 3 (indicative of the deep sea), 20:5 omega 3 (non-complex demersal and deep-sea demersal) and 20:4 omega 6 (reef and brackish water). Temperature was a key driver of four FAs (22:5 omega 6, 22:4 omega 6, 20:1 omega 9 and 20:5 omega 3), while trophic guild and phylogeny were important drivers of two pairs of FA tracers (18:0 and 20:5 omega 3; 20:1 omega 9 and 18:1 omega 9, respectively). 4. This analysis provides a novel understanding of the biological and ecological information that can be inferred from FA profiles and further validates the use of FAs as tracers to investigate the trophic ecology of chondrichthyans. 5. Future research should prioritize ex situ studies to further disentangle the influence of factors across taxa and tissue types, quantify biomodification, enabling the use of quantitative methods for diet determination and further develop 'FATscapes' to elucidate fine-scale trophic geography and climate variability. Additionally, the creation of a taxonomically inclusive FA data repository will enable further meta-analyses.
引用
收藏
页码:1243 / 1255
页数:13
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