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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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Disentangling invasion processes in a dynamic shipping-boating network.

Anaïs Lacoursière-Roussel1, Dan G Bock, Melania E Cristescu

  • 1Department of Biology, McGill University, Montréal, Québec, Canada H3A 1B1. anais.lacoursiere-roussel@mail.mcgill.ca

Molecular Ecology
|July 19, 2012
PubMed
Summary

Commercial shipping is the primary driver of invasive tunicate introductions, with recreational boating facilitating their subsequent spread along coastlines. This study clarifies the distinct roles of these vectors in invasive species dynamics.

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Area of Science:

  • Ecology
  • Marine Biology
  • Invasive Species Management

Background:

  • The roles of different vectors in invasive species establishment and spread are not well understood.
  • Botryllus schlosseri is a cosmopolitan tunicate with a significant invasive potential.

Purpose of the Study:

  • To investigate the relative importance of commercial shipping and recreational boating in the introduction and spread of Botryllus schlosseri in Nova Scotia.
  • To assess single versus multiple introduction scenarios and vector interactions.
  • To determine the influence of boating on population genetic similarity.

Main Methods:

  • Molecular analysis of 874 Botryllus schlosseri individuals from 26 populations (5 ports, 21 marinas) in Nova Scotia.
  • Utilized mitochondrial cytochrome c oxidase subunit I (COI) gene and 10 nuclear microsatellite markers.
  • Analyzed genetic diversity, population similarity, and connectivity patterns.

Main Results:

  • Evidence suggests multiple introductions of Botryllus schlosseri into Nova Scotia.
  • A decline in genetic diversity from port to marina populations indicates a greater role for ships in initial introductions.
  • Marina population genetic similarity is better explained by boating connectivity than natural dispersal, showing dependence on established port populations.

Conclusions:

  • Commercial shipping is responsible for frequent primary introductions of Botryllus schlosseri.
  • Recreational boating plays a crucial role in the secondary spread of this invasive tunicate around established port populations.
  • Understanding vector-specific roles is key for managing invasive species dynamics.