Environmental related variation in growth and life-history traits of non-native sailfin catfishes (Pterygoplichthys spp.) across river basins of South China
Hui Wei, Fei Liu, L. Vilizzi, L. Wood, Yinchang Hu, G. Copp
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引用次数: 2
Abstract
Plasticity in growth and life-history traits is an important attribute of non-native (NN) fishes, facilitating their adaptation to novel environments. Few studies have investigated geographical variations in multiple biological traits and the factors affecting the variations. In this study, variations in multiple biological traits of NN sailfin catfishes Pterygoplichthys spp. were investigated in the main river basins of the Guangdong and Hainan provinces of South China. The impacts of environmental factors on the biological traits were analysed using general linear modeling and an informationtheoretic approach. Among-basin differences in population growth was observed, with richness of competitor fishes negatively affecting growth, maturity and reproductive traits – this suggests biotic resistance was mediated by competition with native fishes. These traits were positively affected by total phosphorus concentration, which is indicative of bottom-up effects, mediated by inorganic nutrients, potentially playing an important role in the invasion success of NN fish. In population level, a bet-hedging strategy was observed in sailfin catfishes under unfavourable environment conditions (e.g. Nangdujiang), whereas a “master-of-some” strategy was found under favourable conditions (e.g. Pearl River Delta and Western Basin). The results suggested that plasticity in multiple biological traits of sailfin catfishes is an important strategy to overcome changing environmental conditions in different rivers, and habitat-specific variations across river basins would reflect trade-offs amongst traits at the population level. Therefore, habitat-specific management measures, adapted to the invaded ecosystem’s features and the life-history strategy of the NN species, could provide an effective means to control invasive species.
期刊介绍:
Aquatic Invasions is an open access, peer-reviewed international journal focusing on academic research of biological invasions in both inland and coastal water ecosystems from around the world.
It was established in 2006 as initiative of the International Society of Limnology (SIL) Working Group on Aquatic Invasive Species (WGAIS) with start-up funding from the European Commission Sixth Framework Programme for Research and Technological Development Integrated Project ALARM.
Aquatic Invasions is an official journal of International Association for Open Knowledge on Invasive Alien Species (INVASIVESNET).
Aquatic Invasions provides a forum for professionals involved in research of aquatic non-native species, including a focus on the following:
• Patterns of non-native species dispersal, including range extensions with global change
• Trends in new introductions and establishment of non-native species
• Population dynamics of non-native species
• Ecological and evolutionary impacts of non-native species
• Behaviour of invasive and associated native species in invaded areas
• Prediction of new invasions
• Advances in non-native species identification and taxonomy