Fertilization success and recruitment of dioecious and hermaphroditic fucoid seaweeds with contrasting distributions near their southern limit

Ladah, Lydia B.; Bermudez, Rafael; Pearson, G. A.; Serrão, Ester Á.

doi:10.3354/meps262173

Cited by 46 publications

(43 citation statements)

References 39 publications

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“…The underlying mechanism is likely the release of gametes during low tide or periods of calm water conditions as observed generally in fucoid algae (e.g. Brawley 1992, Ladah et al 2003; reviewed by Brawley et al 1999, Pearson & Serrão 2006, which should increase settlement of zygotes near or under adults and would explain our observations of much higher 1 d recruitment within the canopy. We did not systematically examine recruitment patterns on natural surfaces, but recruitment on bare rock surfaces is rare at this site and usually only occurred in lower zones on rock faces protected from direct sunlight (Lamote 2003).…”

Section: Discussionsupporting

confidence: 45%

Temporal and spatial variation in the early recruitment of fucoid algae: the role of microhabitats and temporal scales

Lamote¹,

Johnson²

2008

Mar. Ecol. Prog. Ser.

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The recruitment of a multi-species assemblage of fucoid algae, Ascophyllum nodosum (L.) Le Jolis, Fucus vesiculosus L., and F. distichus L. ssp. edentatus (Pyl.) Powell, onto artificial substrata over different temporal and spatial scales was examined on a semi-exposed rocky shore in Québec, Canada. Measurements were taken at daily (1 d), fortnightly (15 d), and monthly (30 d) periods in 3 microhabitats (exposed rock surfaces, under adult fucoids, and in tide pools) from July through September in 3 consecutive years (1998 to 2000). Recruitment was spatially and temporally variable among months and years with much less recruitment in 1998. Recruitment was consistently lowest in September. The density of reproductive adults did not generally affect the rate of recruitment, but the rate of recruitment was negatively correlated with wind speed, a possible indicator of wave action. Among microhabitats, the recruitment was over 10 to 50 times greater under the canopy relative to exposed surfaces and tide pools. Mortality of outplanted embryos was only slightly higher outside the canopy, which suggests that it is limited dispersal and not differential survival that leads to high numbers of recruits under the canopy. There were, however, no differences in the numbers of recruits accumulating from 1 to 30 d, suggesting that overall post-settlement mortality rates are extremely high.

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Section: Discussionsupporting

confidence: 45%

Temporal and spatial variation in the early recruitment of fucoid algae: the role of microhabitats and temporal scales

Lamote¹,

Johnson²

2008

Mar. Ecol. Prog. Ser.

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“…Intermediate genotypes (putative hybrids) between F. spiralis and co-occurring 2006; Billard et al, 2010) and can be expected wherever F. spiralis and F. vesiculosus co-occur along rocky intertidal shores north of NW Iberia. However, the two species do not co-occur further south (Ladah et al, 2003). Fig.…”

Section: Divergence Of F Spiralis Entitiesmentioning

confidence: 93%

“…The presence of Fsp-South in southern Portugal (Albufeira) and its near-absence north of northern Portugal (Viana do Castelo) brackets a well-described biogeographic boundary along the central Portuguese coast for diverse species such as red algae, ground fish, and seagrass (Alberto et al, 1999;Gomes, 2001;Diekmann et al, 2005), as well as the composition of intertidal communities (Boaventura et al, 2002;Lima et al, 2007). Abiotic dissimilarities such as changes in coastal morphology, precipitation patterns, outflow of Tagus River, the imposing submarine Nazaré Canyon, air temperatures, sea surface temperatures, and surface currents undoubtedly maintain the North-South break (Gomes, 2001;Boaventura et al, 2002;Martins et al, 2002;Ladah et al, 2003;Koho et al, 2007). The break is especially important for species with limited gamete dispersal, such as F. spiralis (Ladah et al, 2008).…”

Section: F Spiralis -North Atlanticmentioning

confidence: 99%

Evolution and diversification within the intertidal brown macroalgae Fucus spiralis/F. vesiculosus species complex in the North Atlantic

Coyer¹,

Hoarau²,

Costa³

et al. 2011

Molecular Phylogenetics and Evolution

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“…Propagule settlement was studied using artificial substrata (5.96 cm 2 ) with high rugosity (described in Ladah et al, 2003). In each pool, two bolts were fixed at haphazardly chosen positions under the canopy of the dominant species.…”

Section: Methodsmentioning

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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Fertilization success and recruitment of dioecious and hermaphroditic fucoid seaweeds with contrasting distributions near their southern limit

Cited by 46 publications

References 39 publications

Temporal and spatial variation in the early recruitment of fucoid algae: the role of microhabitats and temporal scales

Temporal and spatial variation in the early recruitment of fucoid algae: the role of microhabitats and temporal scales

Evolution and diversification within the intertidal brown macroalgae Fucus spiralis/F. vesiculosus species complex in the North Atlantic

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

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