Stable同位素值和营养分析表明,康斯坦斯湖上游入侵三棘鱼具有显著的鱼类特征

IF 3.8 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Neobiota Pub Date : 2023-08-14 DOI:10.3897/neobiota.87.100355
S. Gugele, J. Baer, C. Spiessl, E. Yohannes, S. Blumenshine, Barnaby Roberts, Mário Mota‐Ferreira, A. Brinker
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引用次数: 0

摘要

三棘棘鱼Gasterosteus aculeatus于20世纪40年代被引入康斯坦茨湖,直到2012年底才占据了有限的范围。从那时起,这个物种就从康斯坦茨湖上游的沿海栖息地扩展开来,但现在季节性地迁徙到远洋区。这种行为变化伴随着刺鱼数量的急剧增加。为了整合康斯坦斯湖上棘鱼连续两年的摄食信息,将胃内容物分析与两种组织(肌肉和肝脏)的季节性稳定同位素分析相结合。对浮游动物、白鱼幼鱼和鱼卵也进行了同位素测定。我们使用贝叶斯混合模型(SIMMR)计算了棘鱼饮食中潜在食物来源的贡献。此外,我们还确定了棘鱼的营养地位,并比较了康斯坦斯湖其他鱼类的δ15N和δ13C值。贝叶斯模型和胃内容物分析的结果清楚地表明,棘鱼捕食鱼卵和幼虫。冬季棘鱼的δ15N值升高,与食鱼梭子鱼相当,而浮游动物的δ15N值降低,考虑N同位素的营养分异,白鱼幼鱼的δ15N值与棘鱼相似。营养位置计算进一步确定了棘鱼为食鱼鱼,而肝脏和胃含量的δ13C值分析表明康斯坦斯湖可能存在底栖-中上层物种对。这些发现支持了一种假设,即康斯坦斯湖的棘鱼可以对同域鱼类(最有可能是白鱼的幼虫和卵)表现出食鱼行为。
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Stable isotope values and trophic analysis of invasive three-spined stickleback in Upper Lake Constance points to significant piscivory
The three-spined stickleback Gasterosteus aculeatus was introduced into Lake Constance in the 1940s and occupied a limited range until late 2012. Since then the species has expanded from a solely littoral habitat in Upper Lake Constance, but now makes seasonal migrations into the pelagic zone. This behavioral change has been accompanied by a drastic increase in stickleback abundance. In order to integrate information about feeding of sticklebacks in Upper Lake Constance over two consecutive years, stomach content analysis was combined with seasonal stable isotope analysis on two types of tissue (muscle and liver). Isotope values were also obtained for zooplankton, whitefish larvae and eggs. We calculated the contribution of potential food sources for sticklebacks’ diet using a Bayesian mixing model (SIMMR). Furthermore, we determined stickleback trophic position, and δ15N and δ13C values were compared with those of other fish species of Lake Constance. The results of the Bayesian model as well as the stomach content analysis showed clear evidence of stickleback predation on fish eggs and larvae. Stickleback δ15N values were elevated during winter and comparable to those of piscivorous pike, while δ15N values of zooplankton were reduced, and those of whitefish larvae were similar to those of sticklebacks after accounting trophic fractionation of N isotopes. Trophic position calculations further identified sticklebacks as piscivorous, while the δ13C values of the liver and stomach content analysis suggests that a benthic-pelagic species pair may exist in Lake Constance. These findings support the hypotheses that sticklebacks in Lake Constance can display piscivorous feeding behaviour on sympatric fish species, most likely whitefish larvae and eggs.
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来源期刊
Neobiota
Neobiota Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
8.10
自引率
7.80%
发文量
0
审稿时长
6 weeks
期刊介绍: NeoBiota is a peer-reviewed, open-access, rapid online journal launched to accelerate research on alien species and biological invasions: aquatic and terrestrial, animals, plants, fungi and micro-organisms. The journal NeoBiota is a continuation of the former NEOBIOTA publication series; for volumes 1-8 see http://www.oekosys.tu-berlin.de/menue/neobiota All articles are published immediately upon editorial approval. All published papers can be freely copied, downloaded, printed and distributed at no charge for the reader. Authors are thus encouraged to post the pdf files of published papers on their homepages or elsewhere to expedite distribution. There is no charge for color.
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