Temporal Variation in Isomorphic Phase and Sex Ratios of a Natural Population of Ulva Pertusa (Chlorophyta)1

Hiraoka, Masanori; Yoshida, Goro

doi:10.1111/j.1529-8817.2010.00873.x

Cited by 16 publications

(16 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High variability of microbial communities from the same host has been shown for several other macroalgal species (Miranda, Hutchison, Grossman, & Brawley, 2013;Stratil, Neulinger, Knecht, Friedrichs, & Wahl, 2013). Such within-species variation would further support the hypothesis of horizontal acquisition of the epiphytic microbiota and may reflect seasonal variation of bacterial communities in the surrounding seawater (Schauer, Balagu e, & Pedr os-Ali o, 2003) or the fact that the reproduction of Ulva occurs in different seasons (Hiraoka & Yoshida, 2010). However, for the current study, individual thalli of the same size were sampled and thus should be coetaneous.…”

Section: Specificity Of Bacterial Communities On Cooccurring Ulva Ssupporting

confidence: 70%

Functional biogeography and host specificity of bacterial communities associated with the Marine Green Alga Ulva spp.

et al. 2018

View full text Add to dashboard Cite

Bacterial communities play an essential role for the function of marine macroalgae. Recent work has shown that bacterial communities associated with individual macroalgae possess on a local scale a functional core that is likely derived from diverse members of functional guilds. It is not known whether such functional cores also exist across large spatial scales or between closely related host species. To address this, we studied here the bacterial communities on three species of the green macroalgal genus Ulva from different geographic locations. While the taxonomic composition was too variable to describe a community core, we identified genes that were enriched across all Ulva samples as compared to the communities of the surrounding seawater. Of these core functions, 70% were consistently found and independent of the Ulva species and biogeography, while the remaining functions (~30%) are possibly involved in local or host-specific adaptations. For each host individual, the core functions are provided by bacteria with distinct phylogenetic origin and these bacteria could constitute a global guild of Ulva-associated bacteria. Together, our results demonstrate the presence of a stable core set of functional genes in the bacterial communities associated with closely related host species and across large biogeographies.

show abstract

Section: Specificity Of Bacterial Communities On Cooccurring Ulva Ssupporting

confidence: 70%

Functional biogeography and host specificity of bacterial communities associated with the Marine Green Alga Ulva spp.

et al. 2018

View full text Add to dashboard Cite

show abstract

“…However, this requires confirmation through the cultivation of successive generations. In general, gametes are positively phototactic [34], [67], [68], while asexual biflagellate zoids are negatively phototactic [17], as are quadriflagellate zoospores [37] and zygotes [34]. The negative phototaxis guides swarmers to suitable surfaces for settlement and attachment [69].…”

Section: Discussionmentioning

confidence: 99%

Methods for the Induction of Reproduction in a Tropical Species of Filamentous Ulva

et al. 2014

View full text Add to dashboard Cite

The green seaweed Ulva is a major fouling organism but also an edible aquaculture product in Asia. This study quantified for the first time the effect of key factors on the reproduction of a tropical species of filamentous Ulva (Ulva sp. 3). The controlled timing of release of swarmers (motile reproductive bodies) was achieved when experiments were initiated in the early afternoon by exposing the thalli to a temperature shock (4°C) for 10 min and subsequently placing them into autoclaved filtered seawater under a 12 h light: 12 h dark photoperiod at 25°C. The release of swarmers then peaked two days after initiation. In contrast, segmentation, dehydration, salinity or time of initiation of experiments had no effect of any magnitude on reproduction. The released swarmers were predominantly biflagellate (95%), negatively phototactic and germinated without complementary gametes. This indicates that Ulva sp. 3 has a simple asexual life history dominated by biflagellate zoids.

show abstract

“…The green macroalgal genus Ulva forms large and dense sheets, a phenomenon known as green tides, and can proliferate by asexual (e.g., fragmentation, spore formation) [ 5 , 17 , 18 ] and sexual reproduction [ 19 ]. Green tides include many genera of green algae, such as Chaetomorpha , and affect at least 37 countries worldwide [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…There are few published studies on the in situ life cycle dynamics of Ulva ; Hiraoka and Yoshida [ 19 ] found a non-seasonal alternating dominance of the two phases for U . pertusa , Alström-Rapaport and colleagues [ 24 ] and Pringle [ 25 ] found a seasonal shift, with an increase of the proportion of gametophytes during the summer months in U .…”

Section: Introductionmentioning

confidence: 99%

“…Although isomorphic sporophytes and gametophytes appear identical, they can occupy different ecological niches [ 29 – 31 ]. For example, one phase may be responsible for forming blooms, while the other may occur during non-bloom forming months, although data on these dynamics are relatively unknown [ 32 , 33 ]. In addition, the two phases may vary in growth rates, temperature optima, or susceptibility to herbivores [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ploidy Distribution of the Harmful Bloom Forming Macroalgae Ulva spp. in Narragansett Bay, Rhode Island, USA, Using Flow Cytometry Methods

et al. 2016

View full text Add to dashboard Cite

Macroalgal blooms occur worldwide and have the potential to cause severe ecological and economic damage. Narragansett Bay, RI is a eutrophic system that experiences summer macroalgal blooms composed mostly of Ulva compressa and Ulva rigida, which have biphasic life cycles with separate haploid and diploid phases. In this study, we used flow cytometry to assess ploidy levels of U. compressa and U. rigida populations from five sites in Narragansett Bay, RI, USA, to assess the relative contribution of both phases to bloom formation. Both haploid gametophytes and diploid sporophytes were present for both species. Sites ranged from a relative overabundance of gametophytes to a relative overabundance of sporophytes, compared to the null model prediction of √2 gametophytes: 1 sporophyte. We found significant differences in cell area between ploidy levels for each species, with sporophyte cells significantly larger than gametophyte cells in U. compressa and U. rigida. We found no differences in relative growth rate between ploidy levels for each species. Our results indicate the presence of both phases of each of the two dominant bloom forming species throughout the bloom season, and represent one of the first studies of in situ Ulva life cycle dynamics.

show abstract

Temporal Variation in Isomorphic Phase and Sex Ratios of a Natural Population of Ulva Pertusa (Chlorophyta)1

Cited by 16 publications

References 50 publications

Functional biogeography and host specificity of bacterial communities associated with the Marine Green Alga Ulva spp.

Functional biogeography and host specificity of bacterial communities associated with the Marine Green Alga Ulva spp.

Methods for the Induction of Reproduction in a Tropical Species of Filamentous Ulva

Ploidy Distribution of the Harmful Bloom Forming Macroalgae Ulva spp. in Narragansett Bay, Rhode Island, USA, Using Flow Cytometry Methods

Contact Info

Product

Resources

About