Grazer-controlled recruitment of the introduced Sargassum muticum (Phaeophyceae, Fucales) in northern Europe

Sjøtun, Kjersti; Eggereide, Sarah F.; Høisæter, Tore

doi:10.3354/meps342127

Cited by 18 publications

(15 citation statements)

References 43 publications

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“…Fucus spp. (Parker & Chapman, 1994;Lotze & Worm, 2001), Ascophyllum nodosum (Linnaeus) Le Jolis 1863 (Bertness et al, 2002) and more recently S. muticum (Sjøtun et al, 2007) showed negative effects of grazing on early recruits, as we suggest here. In A. nodosum, a clear effect of grazing on the recruits with 2-day-old was observed, but surprisingly, this effect weakened as recruits became older (Dudgeon & Petraitis, 2005).…”

Section: Discussionsupporting

confidence: 49%

“…Density-dependent effects probably start to play an important role above a certain threshold. This threshold was probably not reached in this study and Sjøtun et al (2007), but was so in Andrew & Viejo (1998).…”

Section: Discussioncontrasting

confidence: 46%

“…Some studies have reported strong intra-specific competition and self-thinning (Andrew & Viejo, 1998;Arenas & Fernández, 2000), whereas others such as Sjøtun et al (2007) found no evidence of density-dependent mortality and intra-specific competition. In our experiments, survival of recruits was much lower compared to the survival levels reported for northern Spain (Andrew & Viejo, 1998) and Norway (Sjøtun et al, 2007). This difference is likely due to the fact that we studied recruits in a much earlier stage of development and over relative short time incubations in the field.…”

Section: Discussionmentioning

confidence: 95%

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Habitat-related differences in recruitment and survival of early recruits of the invasive Sargassum muticum (Phaeophyta, Sargassaceae) in northern Portugal

2011

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Habitat-related differences in recruitment and early survival of the invasive seaweed Sargassum muticum were investigated in relation to the lunar phase (gamete release trigger) and meso-grazing between mid-intertidal and low-intertidal pools in northern Portugal. In situ experiments were performed to determine recruitment and to test the effect of intertidal level (mid-intertidal and low-intertidal pools), grazing (no cage, cage and open cage), and lunar phase (full, new and each quarter moon) on recruit survival during reproductive seasons in two consecutive years. Our results show clearly that recruitment and survival were higher in the midintertidal than in low-intertidal environment in both study periods. Caging treatments affected recruit survival in both environments, however, differences in patterns suggesting differences in grazing pressure due to differences in grazer density and/or the assemblages. It therefore seems that grazing on early recruits of this invader might contribute to the resistance to proliferation. Mid-intertidal pools constitute a more favourable environment for recruits of S. muticum than the low-intertidal, which may explain the mainly mid-intertidal distribution of the species in Portugal.

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Section: Discussionsupporting

confidence: 49%

Section: Discussioncontrasting

confidence: 46%

Section: Discussionmentioning

confidence: 95%

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Habitat-related differences in recruitment and survival of early recruits of the invasive Sargassum muticum (Phaeophyta, Sargassaceae) in northern Portugal

2011

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“…In fact, marine generalist herbivores appear to globally avoid invasive seaweeds (see for e.g., Boudouresque et al 1996;Gollan and Wright 2006 for Caulerpa taxifolia; Scheibling and Anthony 2001;Scheibling et al 2008 for Codium fragile spp. tomentosoides, or Monteiro et al 2009 for Sargassum muticum), although juvenile stages of some invasive algae can be consumed and suppressed (e.g., Thornber et al 2004 for Undaria pinnatifida, Sjotun et al 2007 for Sargassum muticum).…”

Section: Discussionmentioning

confidence: 99%

Effects of invasive seaweeds on feeding preference and performance of a keystone Mediterranean herbivore

2010

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The consequences of invasive species on ecosystem processes and ecological interactions remain poorly understood. Predator-prey interactions are fundamental in shaping species evolution and community structure and can be strongly modified by species introductions. To fully understand the ecological effects of invasive species on trophic linkages it is important to characterize novel interactions between native predators and exotic prey and to identify the impacts of invasive species on the performance of native predators. Although seaweed invasions are a growing global concern, our understanding of invasive algae-herbivore interactions is still very limited. We used a series of feeding experiments between a native herbivore and four invasive algae in the Mediterranean Sea to examine the potential of native sea urchins to consume invasive seaweeds and the impacts of invasive seaweed on herbivore performance. We found that three of the four invasive species examined are avoided by native herbivores, and that feeding behaviour in sea urchins is not driven by plant nutritional quality. On the other hand, Caulerpa racemosa is readily consumed by sea urchins, but may escape enemy control by reducing their performance. Recognizing the negative impacts of C. racemosa on herbivore performance has highlighted an enemy escape mechanism that contributes to explaining how this widespread invasive alga, which is preferred and consumed by herbivores, is not eradicated by grazing in the field. Furthermore, given the ecological and economic importance of sea urchins, negative impacts of invasive seaweeds on their performance could have dramatic effects on ecosystem function and services, and should be accounted for in sea urchin population management strategies.

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“…There is ample evidence demonstrating that native herbivores feed on and can regulate the distribution and abundance of non-native seaweeds (Trowbridge 2002;Sjotun et al, 2007;Lyons & Scheibling, 2008). However, it is also important to consider the broader food web context, because to the extent that predators influence the distribution and abundance of herbivores (e.g., Duggins, 1983;Duffy & Hay, 2002) they may indirectly mediate interactions between native herbivores and their non-native prey.…”

Section: Introductionmentioning

confidence: 97%

Response of a native, herbivorous snail to the introduced seaweed Sargassum muticum

et al. 2010

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The role of native consumers in mediating biological invasions is poorly understood. In theory, there are reasons to expect both strong and weak effects of native consumers on non-native species. However, non-native ranges may include multiple regions or even continents, each with its own suite of consumers and invader-consumer interactions may play out differently in different places and times. In this Washington State (USA) study we found that the common herbivorous snail Lacuna vincta was 2-9 times more abundant on the nonnative seaweed Sargassum muticum, compared to native kelps. Choice feeding trials with fresh tissue and artificial foods both suggest that S. muticum is a preferred food for Lacuna vincta. Lab experiments indicated that L. vincta did not experience diminished predation by two common predators on Sargassum muticum compared to native kelp hosts. Our results suggest that Sargassum experiences considerable herbivory by Lacuna vincta in our study region, a conclusion that is consistent with previous work and our own field observations. In our system, L. vincta and S. muticum have been coexisting in the same habitats for at least 50 years and available data suggest that it acquired a preference for S. muticum more than 30 years after the initial invasion. Comparison of our results to recent work on Sargassumherbivore interactions in Europe suggests that the response of native consumer communities to S. muticum varies both within and among regions. Geographic and temporal variation in the response of native consumers are likely to be hallmarks of many large-scale invasions.

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Grazer-controlled recruitment of the introduced Sargassum muticum (Phaeophyceae, Fucales) in northern Europe

Cited by 18 publications

References 43 publications

Habitat-related differences in recruitment and survival of early recruits of the invasive Sargassum muticum (Phaeophyta, Sargassaceae) in northern Portugal

Habitat-related differences in recruitment and survival of early recruits of the invasive Sargassum muticum (Phaeophyta, Sargassaceae) in northern Portugal

Effects of invasive seaweeds on feeding preference and performance of a keystone Mediterranean herbivore

Response of a native, herbivorous snail to the introduced seaweed Sargassum muticum

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