Dispersal potential of invasive algae: the determinants of buoyancy in Codium fragile ssp. fragile

Gagnon, Karine; McKindsey, Christopher W.; Johnson, Ladd E.

doi:10.1007/s00227-011-1746-z

Cited by 20 publications

(10 citation statements)

References 33 publications

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“…La mayor cantidad de gametangios en la sección media respecto a la sección apical, particularmente en otoño e invierno, podría deberse a la ausencia de gametangios en las puntas de los ápices debido a un activo crecimiento (adición de utrículos) en este periodo, factor previamente descrito para esta subespecie (Trowbridge 1998). El patrón espacial resultante sería relevante para entender la dispersión de esta especie dado que la gran cantidad de gametangios en las secciones apical y media corresponden también a la parte del talo con mayor flotabilidad (Gagnon et al 2011). Así, fragmentos apicales a la deriva, podrían ser propágulos para la colonización de nuevos sitios.…”

Section: Resultados Y Discusiónunclassified

“…Si éstos son capaces de liberar esporas o generar cigotos, podrían constituir un medio alternativo de dispersión, alcanzando mayores distancias que unidades de dispersión tradicionales (Macaya et al 2005). De hecho, fragmentos de C. fragile a la deriva son considerados importantes vectores de introducción y expansión (Mathieson et al 2003, Gagnon et al 2011. En Chile, la expansión de C. fragile es asociada con la cercanía de otras poblaciones de C. fragile (Neill 2007), dado la mayor presión de propágulos generada por fragmentos a la deriva, los cuales podrían constituir importantes vectores de dispersión secundaria.…”

Section: Resultados Y Discusiónunclassified

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Variación espacial y temporal en la producción de gametangios en la macroalga exótica Codium fragile subsp. tomentosoides (Chlorophyta: Bryopsidales) en el submareal de Caldera, Chile

Villaseñor-Parada¹,

Macaya²,

Jara-Rojas

et al. 2013

Rev. biol. mar. oceanogr.

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Variación espacial y temporal en la producción de gametangios en la macroalga exótica Codium fragile subsp. tomentosoides (Chlorophyta: Bryopsidales) en el submareal de Caldera, Chile Abstract.-The macroalga Codium fragile ssp. tomentosoides is characterized by exclusive asexual reproduction through parthenogenesis. We describe the spatial (within thallus) and temporal (seasonal) variability in the abundance of reproductive structures (gametangia) in specimens of C. fragile collected from the subtidal zone of Caldera, Chile. Gametangia are more frequent on newer sections of the thallus (apical and middle), increasing during austral springsummer, and with thallus size (i.e., length and number of dichotomies). Given that apical fragments are highly buoyant and thallus fragmentation increases during the summer, drifting fragments may be important dispersal vectors contributing to the spread of this species to new sites.

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Section: Resultados Y Discusiónunclassified

Variación espacial y temporal en la producción de gametangios en la macroalga exótica Codium fragile subsp. tomentosoides (Chlorophyta: Bryopsidales) en el submareal de Caldera, Chile

Villaseñor-Parada¹,

Macaya²,

Jara-Rojas

et al. 2013

Rev. biol. mar. oceanogr.

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“…, Gagnon et al. ), perhaps such approaches will become more successful. Likewise, the distribution and density of seaweed species at a local scale is strongly influenced by biotic interactions (Scheibling and Gagnon , Edwards and Connell ).…”

Section: Discussionmentioning

confidence: 99%

“…While this approach clearly has potential, a study of two nonindigenous bivalves in New Zealand yielded low predictive power (Inglis et al 2006). As we start gaining a better understanding of invasive seaweed dispersal (Arrontes 2005, Mineur et al 2010, Gagnon et al 2011), perhaps such approaches will become more successful. Likewise, the distribution and density of seaweed species at a local scale is strongly influenced by biotic interactions Gagnon 2006, Edwards andConnell 2012).…”

Section: Niche Models Of Invasive Seaweedsmentioning

confidence: 99%

Ecological niche models of invasive seaweeds

Marcelino

Verbruggen

2015

Journal of Phycology

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Ecological niche models (ENMs) are commonly used to calculate habitat suitability from species' occurrence and macroecological data. In invasive species biology, ENMs can be applied to anticipate whether invasive species are likely to establish in an area, to identify critical routes and arrival points, to build risk maps and to predict the extent of potential spread following an introduction. Most studies using ENMs focus on terrestrial organisms and applications in the marine realm are still relatively rare. Here, we review some common methods to build ENMs and their application in seaweed invasion biology. We summarize methods and concepts involved in the development of niche models, show examples of how they have been applied in studies on algae and discuss the application of ENMs in invasive algae research and to predict effects of climate change on seaweed distributions.

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“…By contrast, most red and green algae are only buoyant when gas bubbles get trapped between or within the algal thallus (Dromgoole 1982, Back et al 2000. This may only occur in the daytime, when the alga is photosynthesizing (Dromgoole 1982), in spring and summer months when photosynthesis is greatest (Back et al 2000, Gagnon et al 2011, or when nutrient availability is high (Richardson & Cullen 1995). Where a mismatch occurs between the timing of plant buoyancy and recruitment events of hitchhikers, the capacity for broad-scale dispersal of organisms may be severely reduced.…”

Section: Raft Qualitymentioning

confidence: 99%

Implications of climate change for macrophytic rafts and their hitchhikers

Macreadie

Bishop²,

Booth

2011

Mar. Ecol. Prog. Ser.

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Most models predicting changes to species distributions under future climate scenarios ignore dispersal processes, despite their importance in determining community structure in both terrestrial and aquatic systems ('supply-side ecology'). In the marine environment, facilitation of long-distance dispersal of coastal organisms by macrophytic rafts may be severely modified by climate impacts on raft supply, quality, and persistence, and on transport processes. Increasing storminess in the coastal zone, higher water temperatures, and changes in water circulation represent some of the key mechanisms that will directly affect rafts, while increases in herbivore metabolism due to higher water temperatures are likely to indirectly reduce raft longevity through raft consumption. Accurate predictions of climate impacts on coastal biodiversity will be contingent on resolution of factors influencing rafting so that this and other dispersal mechanisms can be incorporated into species distribution models.

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Dispersal potential of invasive algae: the determinants of buoyancy in Codium fragile ssp. fragile

Cited by 20 publications

References 33 publications

Variación espacial y temporal en la producción de gametangios en la macroalga exótica Codium fragile subsp. tomentosoides (Chlorophyta: Bryopsidales) en el submareal de Caldera, Chile

Variación espacial y temporal en la producción de gametangios en la macroalga exótica Codium fragile subsp. tomentosoides (Chlorophyta: Bryopsidales) en el submareal de Caldera, Chile

Ecological niche models of invasive seaweeds

Implications of climate change for macrophytic rafts and their hitchhikers

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