Establishment of the introduced kelp Undaria pinnatifida in Tasmania depends on disturbance to native algal assemblages

By J. Valentine, Craig R. Johnson. 2003

188 citations recorded by the source corpus.

Abstract Despite recent rapid increases in the occurrence of nonindigenous marine organisms in the marine environment, few studies have critically examined the invasion process for a marine species. Here we use manipulative experiments to examine processes of invasion for the Asian kelp Undaria pinnatifida (Harvey) Suringar at two sites on the east coast of Tasmania. Disturbance to reduce cover of the native algal canopy was found to be critical in the establishment of U. pinnatifida , while the presence of a stable native algal canopy inhibited invasion. In the first sporophyte growth season following disturbance of the canopy, U. pinnatifida recruited in high densities (up to 19 plants m −2 ) while remaining rare or absent in un-manipulated plots. The timing of disturbance was also important. U. pinnatifida recruited in higher densities in plots where the native canopy was removed immediately prior to the sporophyte growth season (winter 2000), compared with plots where the canopy was removed 6 months earlier during the period of spore release (spring 1999). Removal of the native canopy also resulted in a significant increase in cover of sediment on the substratum. In the second year following canopy removal, U. pinnatifida abundance declined significantly, associated with a substantial recovery of native canopy-forming species. A feature of the recovery of the native algal canopy was a significant shift in species composition. Species dominant prior to canopy removal showed little if any signs of recovery. The recovery was instead dominated by canopy-forming species that were either rare or absent in the study areas prior to manipulation of the canopy.

Subfields: Ecology, Oceanography

View Paper: https://www.semanticscholar.org/paper/7abf6a55f1ebb36805e58669bd1cc5c250bbc259

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Ecology

In Oceanography

Citations in the corpus

Population ecology of the invasive kelp Undaria pinnatifida in California: environmental and biological controls on demography (2004, background): “…controls on life history and demography As has been shown in this and other studies, local environmental modifications can affect the population dynamics, and potentially alter the success, of species invading new habitats (Andrew & Viejo 1998, Ruiz et al. 2000, Valentine & Johnson 2003).”
Recovery of canopy-forming macroalgae following removal of the enigmatic grazing sea urchin Heliocidaris erythrogramma (2010, background): “…algal response in this study as this species is found to seasonally form dense mono-specific stands on H. erythrogramma barrens at MP and was thus considered independent of brown algal recovery per se (Sanderson and Barrett, 1989; Sanderson, 1990, 1997; Valentine and Johnson, 2003, 2004, 2005a,b).”
Introduced Macroalgae – a Growing Concern (2006, background): “For example, the establishment of U. pinnatifida in Australia was facilitated by reduced native macroalgal cover (Valentine & Johnson, 2003; 2004).”
The role of kelp species as biogenic habitat formers in coastal marine ecosystems (2017, background): “…structure of understorey 700 assemblages, but such disturbances can also provide opportunity for the recruitment and growth of 701 non-native species (Valentine and Johnson, 2003), potentially with detrimental effects on the 702 diversity and habitat structure of these systems (Bax et al., 2001).”
A Global Review of the Distribution, Taxonomy, and Impacts of Introduced Seaweeds (2007, background): “…Effecta Response variableb Location (citation) 0 Seaweed cover Tasman Sea (Valentine & Johnson 2005) Seaweed community structure Tasman Sea (Valentine & Johnson 2003) – Kelps; tunicate NE Atlantic (Farrell & Fletcher 2006) Gracilaria salicornia – Fish food choice central Pacific (Smith et…”
The Role of Propagule Pressure in Invasion Success (2009, background): “Valentine and Johnson (2003, 2005) took a different approach and enhanced the density of spores of the invasive algae Undaria pinnatifida by hanging mesh bags containing fertile sporophylls over experimental plots.”
Short‐ and long‐term effects of disturbance and propagule pressure on a biological invasion (2007, background): “Journal compilation © 2007 British Ecological Society, Journal of Ecology, 96, 68‐77 et al. 1993; Levin et al. 2002; Valentine & Johnson 2003; Clark & Johnston 2005), Parker (2001) found evidence that disturbance reduced Scotch broom (Cystisus scoparius) recruitment from seed at all levels of prop”
The Gray Zone: Relationships between habitat loss and marine diversity and their applications in conservation (2008, background): “Experiments show that alien species tend to invade disturbed habitats more easily than undisturbed ones (Ceccherelli et al., 2000; Valentine and Johnson, 2003; Scheibling and Gagnon, 2006; Britton-Simmons, 2006).”
Establishment of the introduced kelp Undaria pinnatifida following dieback of the native macroalga Phyllospora comosa in Tasmania, Australia (2004, background): “comosa is comparable with that observed following artificial canopy removals in Tasmania and elsewhere (Kennelly 1987, 1989; Valentine and Johnson 2003).”
The expanding range of Undaria pinnatifida in southern New Zealand: distribution, dispersal mechanisms and the invasion of wave-exposed environments (2007, background): “In Tasmania disturbance events that result in canopy removal were identified as key factors in facilitating the invasion of native seaweed assemblages (Valentine and Johnson 2003).”