A chronology of new European sites of attachment for the invasive brown alga,<i>Sargassum muticum</i>, 1973–1981

Critchley, Alan T.; Farnham, W. F.; Morrell, Stephen

doi:10.1017/s0025315400071228

Cited by 99 publications

(62 citation statements)

References 15 publications

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“…Still another possibility is distribution of specimens on drifting Sargassum muticum, introduced to Europe early in the 1970s (Critchley et al, 1983). The primary laterals of this seaweed, to which S. clara frequently attaches, become detached from the holdfast toward the end of the growth cycle and can float for some considerable distance.…”

Section: Means Of Spreadingmentioning

confidence: 99%

Styela clava Herdman (Urochordata, Ascidiacea), a successful immigrant to North West Europe: ecology, propagation and chronology of spread

Lützen

1998

Helgolander Meeresunters

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Section: Means Of Spreadingmentioning

confidence: 99%

Styela clava Herdman (Urochordata, Ascidiacea), a successful immigrant to North West Europe: ecology, propagation and chronology of spread

Lützen

1998

Helgolander Meeresunters

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“…Sargassum muticum originates from northwestern Pacific shores of Japan, Russia, Korea and China (Yendo, 1907;Critchley et al, 1990), but has invaded the American west coast from Alaska to Mexico in about 50 years (Scagel, 1956;Deysher & Norton, 1982;Critchley et al, 1983) and European coasts from Norway to Portugal in about 30 years (Rueness, 1989;Critchley et al, 1990;Staehr et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Periodicity of propagule expulsion and settlement in the competing native and invasive brown seaweeds,Cystoseira humilisandSargassum muticum(Phaeophyta)

Engelen

Espirito-Santo

Simões

et al. 2008

European Journal of Phycology

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Dense stands of the invasive species Sargassum muticum (Yendo) Fensholt develop in tidal pools close to its southern distributional limit in Europe, the southwest coast of Portugal. Along this coast, sheltered tidal pools form a specific habitat in which colonization occurs. Invaded pools are originally inhabited by Cystoseira humilis Ku¨tzing. Differences in gamete release between the competing native and alien species might be important for the initial settlement and further spread of the invader. Therefore, we tested whether egg expulsion and embryo settlement in both species had the same timing with respect to lunar and tidal cycles. For more than 2 months during the reproductive season egg expulsion and embryo release were monitored daily for each species. Egg expulsion in S. muticum showed a broadly semilunar periodicity peaking around full and new moon (spring tides), when low tides take place in the morning/evening. In contrast, C. humilis egg expulsion showed an asymmetric semilunar-to-lunar periodicity peaking around waning quarter moon, when low tides occur around midday. Embryo settlement detected in pools was low for both species and less periodic. Phase differences in expulsion events between the two species with respect to the semilunar cycle suggest that cues other than the moon are involved in their timing. Our observations suggest that variations in physiological mechanisms and/or environmental conditions result in different patterns of egg expulsion between the two species. This might have consequences for fertilization success, gamete dispersal and survival. It was further found that peaks in egg expulsion and embryo release (i.e. settlement) in S. muticum were much more synchronous at a site in northern Portugal compared with a site close to the current southern distributional limit in south-west Portugal, possibly as a consequence of thermal stress experienced in the south.

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“…Considered an invasive species all around the world (Norton 1976, Critchley et al 1983, it is now one of the dominant seaweeds in many low intertidal and subtidal communities along the northern Portuguese coast (Monteiro et al 2009a). This invasive species is monoecious and selffertile (Norton 1976) and is considered a pseudoperennial alga due to the presence of its lateral branches only for a portion of the year.…”

Section: The Invader Sargassum Muticummentioning

confidence: 99%

Propagule pressure and functional diversity: interactive effects on a macroalgal invasion process

Vaz-Pinto¹,

Olabarria²,

Arenas³

2012

Mar. Ecol. Prog. Ser.

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Invasive species are considered an increasing global threat to marine ecosystems. Understanding which factors can accelerate or reduce invasion success is one of the main goals of invasion ecology. The present study investigated the interactive effects of propagule pressure and native functional diversity on the invasion success of the invasive alga Sargassum muticum (Yendo) Fensholt over a 1 yr invasion process (i.e. settlement, recruitment and colonisation). The invasibility of macroalgal assemblages with different functional diversity was assessed under high and low propagule pressure. Synthetic assemblages resembling natural marine macroalgal assemblages were built and used as model systems. Recruitment discs were used to record early settlement in the assemblages. Recruitment and colonisation success were monitored in the field 2 and 10 mo after exposure to propagule rain in the laboratory. The availability of resources (space and photosynthetically active radiation [PAR]) was also monitored for each assemblage and used as predictive variables in the analyses. The effects of propagule pressure and functional diversity varied among the invasion stages. Space availability did not play a significant role in the recruitment success of the invader. However, PAR was a key resource in its invasion success. Overall, the invasion success of S. muticum was influenced differently by different traits of the recipient assemblages. Hence, invasion success may be better explained by the interaction of environmental factors that co-vary with species diversity and identity at different invasion stages. KEY WORDS: Invasion success · Propagule pressure · Resources · Functional diversity · Sargassum muticum · Macroalgae Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 471: [51][52][53][54][55][56][57][58][59][60] 2012 ultimate goal of any NIS. Understanding which factors influence invasion success through the different stages, and to what extent, is extremely important in invasion ecology (Kolar & Lodge 2001, White & Shurin 2007. Overall, 3 factors are usually cited as determining the fate of invasions: the biology of the introduced species (species invasiveness), the number and frequency of introductions (propagule pressure [PP]) and the susceptibility of the native community to invasion (community invasibility) (Lons dale 1999). Nonetheless, invasion studies are usually focused on only one of these factors (Lonsdale 1999).It is widely accepted that highly diverse communities are more resistant to invasions because of a more complete utilisation of resources, the socalled biotic resistance theory (see Elton 1958, Levine 2000, Fridley et al. 2007 for a review of diversity-invasibility relationships). For benthic algal communities as sessile photosynthetic organisms, space and light are important limiting resources (Sousa 1979). For example, lack of space and low light availability have been shown to negatively affect the invasion success of the brown macroalga Sargass...

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A chronology of new European sites of attachment for the invasive brown alga,Sargassum muticum, 1973–1981

Cited by 99 publications

References 15 publications

Styela clava Herdman (Urochordata, Ascidiacea), a successful immigrant to North West Europe: ecology, propagation and chronology of spread

Styela clava Herdman (Urochordata, Ascidiacea), a successful immigrant to North West Europe: ecology, propagation and chronology of spread

Periodicity of propagule expulsion and settlement in the competing native and invasive brown seaweeds,Cystoseira humilisandSargassum muticum(Phaeophyta)

Propagule pressure and functional diversity: interactive effects on a macroalgal invasion process

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