Kopp Dorothée, Cucherousset Julien, Syväranta Jari, Martino Aurélia, Céréghino Régis, Santoul Frédéric
UMR, CNRS-UPS-INPT, Université de Toulouse, France.
C R Biol. 2009 Aug;332(8):741-6. doi: 10.1016/j.crvi.2009.04.001. Epub 2009 Apr 28.
During the last decades, non-native predatory fish species have been largely introduced in European lakes and rivers, calling for detailed information on the trophic ecology of co-existing native and non-native predators. The present study describes the trophic ecology of the introduced pikeperch (Sander lucioperca) in two southwestern French rivers, using stable isotope analysis. Pikeperch could be categorized as a top-predator, and had a significantly higher trophic position (TP, mean+/-SE=4.2+/-0.1) compared to other predatory fish such as the native pike (Esox lucius, TP=3.7+/-0.1) and the introduced European catfish (Silurus glanis, TP=3.8+/-0.1). Most studies of resource use in freshwaters consider predatory fish as ecologically equivalent; however, this study showed that the pikeperch occupied a higher trophic niche compared to other predatory species in the Lot and Tarn rivers (Garonne River basin). This apparent specialization may thus have consequences upon interspecific relationships within the predatory guild and upon the functional organization of biological communities.
在过去几十年间，非本地的捕食性鱼类大量引入欧洲的湖泊和河流，这就需要详细了解共存的本地和非本地捕食者的营养生态学。本研究利用稳定同位素分析，描述了法国西南部两条河流中引入的梭鲈（Sander lucioperca）的营养生态学。梭鲈可归类为顶级捕食者，与其他捕食性鱼类相比，其营养级（TP，平均值±标准误=4.2±0.1）显著更高，如本地的白斑狗鱼（Esox lucius，TP=3.7±0.1）和引入的欧洲六须鲶（Silurus glanis，TP=3.8±0.1）。大多数关于淡水生物资源利用的研究将捕食性鱼类视为生态等同物；然而，本研究表明，在洛特河和塔恩河（加龙河流域）中，梭鲈占据了比其他捕食性物种更高的营养生态位。因此，这种明显的生态位特化可能会对捕食者群落中的种间关系以及生物群落的功能组织产生影响。
