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The role of natural dispersal mechanisms in the spread of Undaria pinnatifida (Laminariales, Phaeophyceae)

journal contribution
posted on 2023-05-18, 02:04 authored by Forrest, BM, Brown, SN, Taylor, MD, Catriona HurdCatriona Hurd, Hay, CH
The Asian kelp Undaria pinnatifida (Laminariales, Phaeophyceae) was first recorded in New Zealand in 1987 and has since spread via shipping traffic and other vectors to a number of ports and harbours. Here we report the results of laboratory and field studies devised to assess the potential for natural dispersal of Undaria from a founding population. Under laboratory conditions, > 90% of Undaria spores were viable in seawater for at least 5 days, with some viable after 14 days. Spores artificially released into a tidal current resulted later in sporophytes appearing on artificial surfaces positioned 10 m down-current of the release point. Field monitoring of a founding population within the Marlborough Sounds, New Zealand, suggested that natural populations spread at least 100 m yr−1. Reasons for the differences between the dispersal distances of the artificially released spores (10 m) and natural populations (100 m) are discussed. We propose that spore dispersal from fixed stands of Undaria results primarily in short-range spread (metres to hundreds of metres), with dispersal of fragments or whole sporophytes facilitating spread at scales of hundreds of metres to kilometres.

History

Publication title

Phycologia

Volume

39

Issue

6

Pagination

547-553

ISSN

0031-8884

Department/School

Institute for Marine and Antarctic Studies

Publisher

Int Phycological Soc

Place of publication

New Business Office, Po Box 1897, Lawrence, USA, Ks, 66044-8897

Rights statement

Copyright 2000 International Phycological Society

Repository Status

  • Restricted

Socio-economic Objectives

Control of pests, diseases and exotic species in coastal and estuarine environments

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