Leo G. Nico: Here, There, and Everywhere: Alien Fishes In Motion
Channel: Fishbase Sweden
Date: 08/11/2019

Leo G. Nico, United States Geological Survey, gave a lecture titled "Here, There, Aand Everywhere: Alien Fishes In Motion" at FishBase Symposium 2019 in Stockholm, Sweden, October 21, 2019.

ABSTRACT: Throughout history, humans have contributed to the movement of animals—intentionally or accidentally introducing species into habitats well outside known natural ranges. The scale is global. Most introductions of fishes have occurred over the last 150 years and new introductions are commonly documented every year. They include a large and diverse array of taxa, with representatives from nearly every region of the world. Invaded environments include both natural and artificial systems, ranging from small streams and isolated ponds to entire river and lake basins. 

Many introduced fish species have formed established, non-native populations and many of these have subsequently spread (naturally or with the aid of humans), radically and irreversibly changing freshwater fish assemblages and aquatic communities. This presentation focuses on invasions pathways of introduced fishes, geographic distribution of non-native established populations, and dispersal patterns of highly-invasive forms. Beyond certain historical accounts, much of the information and examples given are tied to my own research. Details are provided on several different groups of invasive fishes and an assortment of invaded environments to highlight the variation and complexity of invasion pathways, as well as to reveal how and why introductions occur.