Abstract
Distribution patterns of the non-native seaweeds Sargassum horneri (Turner) C. Agardh and Undaria pinnatifida (Harvey) Suringar on the San Diego and Pacific coast of North America
Highlights
Marine algal invasions have become a pervasive problem
Sargassum horneri was found at 28% of the thirty-two sites and U. pinnatifida was found at 25% of the sites (Table 1)
Establishment, spread and persistence of S. horneri and U. pinnatifida in San Diego County
Summary
Marine algal invasions have become a pervasive problem. Diverse impacts include reductions in biodiversity and the abundance and performance of native species as well as changes in community structure and function (Walker and Kendrick 1998; Thresher 2000; Inderjit et al 2006; Schaffelke et al 2006; Valentine et al 2007). Despite the fact that hundreds of species of non-native seaweeds have been documented around the world, research to date has largely focused on a small fraction of these species and a limited number of invasion locations, or has documented occurrence without analyzing patterns of distribution or change over time (Inderjit et al 2006; Johnson and Chapman 2007; Williams and Smith 2007). Studies that document species-andregion-specific patterns of establishment, spread, and persistence are a crucial first step in closing major gaps in our knowledge of the invasion process. Because invasions often proceed rapidly it is important to gain a better understanding of how new invaders spread in the early stages of establishment
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