Munroe S E M, Heupel M R, Fisk A T, Logan M, Simpfendorfer C A
AIMS@JCU, Australian Institute of Marine Science & College of Marine and Environmental Sciences, James Cook University, Townsville, Qld 4811, Australia; Centre for Sustainable Tropical Fisheries and Aquaculture & College of Marine and Environmental Sciences, James Cook University, Townsville, Qld 4811, Australia.
J Fish Biol. 2015 May;86(5):1567-86. doi: 10.1111/jfb.12660. Epub 2015 Apr 7.
This study used stable-isotope analysis to define the nearshore regional residency and movements of the small-bodied Australian sharpnose shark Rhizoprionodon taylori. Plasma and muscle δ(13) C and δ(15) N of R. taylori were collected from across five embayments and compared with values of seagrass and plankton from each bay. Linear distances between adjacent bays ranged from 30 to 150 km. There was a positive geographic correlation between R. taylori tissue and environmental δ(13) C values. Populations with the highest tissue δ(15) N were collected from bays that had the highest environmental δ(15) N values. These results suggest that R. taylori did not forage more than 100 km away from their capture location within 6 months to 1 year. The successful application of isotope analysis to define R. taylori movement demonstrates that this technique may be used in addition to traditional methods to study the movement of sharks, even within similar habitats across regionally small spatial scales (<100 km).
本研究采用稳定同位素分析来确定小型澳大利亚尖吻鲨（Rhizoprionodon taylori）在近岸区域的居留情况和活动规律。从五个海湾采集了泰勒澳大利亚尖吻鲨的血浆和肌肉中的δ(13)C和δ(15)N，并与每个海湾的海草和浮游生物的值进行比较。相邻海湾之间的直线距离在30至150公里之间。泰勒澳大利亚尖吻鲨组织与环境δ(13)C值之间存在正地理相关性。组织δ(15)N最高的种群是从环境δ(15)N值最高的海湾采集的。这些结果表明，泰勒澳大利亚尖吻鲨在6个月至1年内不会在距离其捕获地点100公里以外的地方觅食。同位素分析成功应用于确定泰勒澳大利亚尖吻鲨的活动，表明该技术除了传统方法外，还可用于研究鲨鱼的活动，即使是在区域内小空间尺度（<100公里）的类似栖息地中。
