Examination of Ulva bloom species richness and relative abundance reveals two cryptically co-occurring bloom species in Narragansett Bay, Rhode Island

Guidone, Michele; Thornber, Carol S.

doi:10.1016/j.hal.2012.12.007

Cited by 50 publications

(17 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have shown that Ulva blooms can be composed of one or several species [37, 49, 25, 28]. The presence of a greater number of bloom-forming species can favour the occurrence of blooms, prolong the duration, and intensity, since different species have different environmental requirements, leading to a temporal and spatial succession [28].…”

Section: Discussionmentioning

confidence: 99%

“…The presence of a greater number of bloom-forming species can favour the occurrence of blooms, prolong the duration, and intensity, since different species have different environmental requirements, leading to a temporal and spatial succession [28]. In this sense, the arrival of cryptic non-native species have been invoked to explain the occurrence of macroalgal tides in places where nutrients conditions remain constants or even improved, and macroalgal tides were not observed previously [29].…”

Section: Discussionmentioning

confidence: 99%

“…For instance, tubular species (which were formerly distinguished with the separate genus Enteromorpha ) possess higher concentrations of trace elements than bladed taxa [27]. Furthermore, the presence of a combination of different species can also stimulate or prolong the intensity and duration of the bloom, since a temporal and spatial succession can occur [28]. The arrival of cryptic non-native species could explain the occurrence of macroalgal tides in places where nutrients conditions remain more or less constants [29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

et al. 2017

View full text Add to dashboard Cite

Enrichment of nutrients and metals in seawater associated with anthropogenic activities can threaten aquatic ecosystems. Consequently, nutrient and metal concentrations are parameters used to define water quality. The European Union’s Water Framework Directive (WFD) goes further than a contaminant-based approach and utilises indices to assess the Ecological Status (ES) of transitional water bodies (e.g. estuaries and lagoons). One assessment is based upon the abundance of opportunistic Ulva species, as an indication of eutrophication. The objective of this study was to characterise Ireland’s Ulva blooms through the use of WFD assessment, metal concentrations and taxonomic identity. Furthermore, the study assessed whether the ecological assessment is related to the metal composition in the Ulva. WFD algal bloom assessment revealed that the largest surveyed blooms had an estimated biomass of 2164 metric tonnes (w/w). DNA sequences identified biomass from all locations as Ulva rigida, with the exception of New Quay, which was Ulva rotundata. Some blooms contained significant amounts of As, Cu, Cr, Pb and Sn. The results showed that all metal concentrations had a negative relationship (except Se) with the Ecological Quality Ratio (EQR). However, only in the case of Mn were these differences significant (p = 0.038). Overall, the metal composition and concentrations found in Ulva were site dependent, and not clearly related to the ES. Nevertheless, sites with a moderate or poor ES had a higher variability in the metals levels than in estuaries with a high ES.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

et al. 2017

View full text Add to dashboard Cite

show abstract

“…We investigated life cycle dynamics in the bloom-forming macroalgae Ulva compressa L. and Ulva rigida C. Agardh, which are common in summer macroalgal blooms in the estuarine system of Narragansett Bay, Rhode Island [ 41 , 42 ]. Macroalgal densities (comprised mostly of Ulva ) peak in the summertime and vary significantly across sites, seasons, and years [ 43 – 45 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

Self Cite

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

“…is probably the most studied genus, due to its cosmopolitan distribution and easy collection (inhabiting the upper mesolittoral) (Joly 1965, Villaça et al 2010. Ulva species have prominent ecological and economic importance such as applications in bioremediation (Neori et al 1991, Vijayaraghavan and Joshi 2014, Oliveira et al 2016), production of noxious blooms (Kong et al 2011, Wang et al 2011, Guidone and Thornber 2013, study of the bacterial-algae interaction (Provasoli and Pinter 1980), as bioindicators of eutrophication conditions (Kozhenkova et al 2006), potential source of biofuels (Li et al 2013), and as a source of food (Mabeau and Fleurence 1993). Ulva species also produce bioactive molecules with biomedical applications on cancer and other therapies (Ryu et al 2013, Wang et al 2013).…”

Section: Ulva Sppmentioning

confidence: 99%

Physiological responses of Ulva fasciata Delile (Ulvales, Chlorophyta): comparison of two populations from thermally distinct sites from Brazilian coast

Martins¹

View full text Add to dashboard Cite

Ulvales, Chlorophyta): comparison of two populations from thermally distinct sites from Brazilian coast. Respostas fisiológicas de Ulva fasciata Delile (Ulvales, Chlorophyta): comparação de duas populações de locais termicamente distintos do litoral brasileiro. São Paulo 2016 2 Nuno Tavares Martins Physiological responses of Ulva fasciata Delile (Ulvales, Chlorophyta): comparison of two populations from thermally distinct sites from Brazilian coast. Respostas fisiológicas de Ulva fasciata Delile (Ulvales, Chlorophyta): comparação de duas populações de locais termicamente ABSTRACTIn a global warming scenario, an increase temperature is expected in addition to the occurrence and intensity of extreme climate events. One example of extreme events is the marine heat waves, which are a major threat to marine macroalgae. Ulva fasciata is a cosmopolitan species that occur in the whole Brazilian coast. This study was performed in two regions of Rio de Janeiro State (RJ) coast. Both regions are tropical, however, Arraial do Cabo/RJ is naturally colder than Niterói/RJ due upwelling phenomenon. This study aimed to: (i) confirm that U. fasciata individuals from these two Brazilian coast regions are of the same species; and (ii), physiologically analyze individuals of U. fasciata in the field and under in-laboratory controlled temperature experiment. We hypothesized that U. fasciata populations grown at thermally different locations would present distinct ecophysiological responses. In the field, it was accessed maximum quantum yield (Fv/Fm) and pigment content, and in laboratory, it was also evaluated growth rate. The in-laboratory controlled experiment comprised three phases: (i) a temperature gradient; (ii) a 5-day heat wave (+ 5 °C);and (iii) a 5-day recovery (-5 °C). The molecular data allow us to state that the two populations belong to the same species. No differences of the fluorescence-derived factors were observed between individuals from both populations in the field, suggesting acclimation. However, differences were detected along all three experimental phases. The analysis of pigment content field data evidenced that individuals from the population of Niterói (warmer site) had higher concentrations of chlorophyll a than individuals from Arraial do Cabo (colder site). However, individuals of population from Niterói when cultured at 21 °C showed the lowest values of pigment. The differences observed suggest ecotypes. In conclusion, as the planet becomes warmer and extreme weather events become more frequent, the likelihood that heat wave to occur is higher. Therefore, U. fasciata from Arraial do Cabo showed better physiological responses to the effects of heat wave, what could confer them higher competitiveness ability to overcome thermal stress.

show abstract

Examination of Ulva bloom species richness and relative abundance reveals two cryptically co-occurring bloom species in Narragansett Bay, Rhode Island

Cited by 50 publications

References 48 publications

Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

Assessment and Characterisation of Ireland's Green Tides (Ulva Species)

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

Physiological responses of Ulva fasciata Delile (Ulvales, Chlorophyta): comparison of two populations from thermally distinct sites from Brazilian coast

Contact Info

Product

Resources

About