A preliminary assessment of the effects of<i>Didymosphenia geminata</i>nuisance growths on the structure and diversity of diatom assemblages of the Restigouche River basin, Quebec, Canada

Gillis, Carole‐Anne; Lavoie, Isabelle

doi:10.1080/0269249x.2014.924437

Cited by 15 publications

(14 citation statements)

References 20 publications

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“…This inverse pattern has been observed in other systems affected by biological invasions, in which the invaders induce responses that varies with the spatial scale [15,26], and may be indicates that broad scale was more appropriately to examined the effects of D. geminata on the communities [10]. The high species richness and diversity associated to local changes in invaded rivers are similar to that described at local scales for rivers of New Zealand [24] and in the high zone of the Biobío River Basin in Chile [21]. Increased diversity may be related to the mucilagenous stalks of D. geminata that offer a habitat for small species of stalked diatoms to settle and increase their density, even surpassing that of D. geminata and of other native species [22].…”

Section: Discussionsupporting

confidence: 66%

“…The high similarity among invaded rivers of different basins in contrast to non-invaded rivers is a response that reflects the magnitude of the changes induced by D. geminata, which leads specifically to a community dominated by species of the Order Cymbellales such as A. minutissimum, which dominate in more than 90% of the invaded sites. The relation between these two species and the dominance of A. minutissimum in rivers invaded by D. geminata has also been reported in rivers of Italy, Poland, Canada and New Zealand [5,24,33], indicating the mechanisms of colonization and the effects of D. geminata may even overcome the scale effect at large scales. The community similarity among invaded sites is produced by the effect that D. geminata has on the density of certain species.…”

Section: Discussionmentioning

confidence: 84%

“…The structure show clearly that community variability decreased within sites invaded by D. geminata suggesting community homogenization was occurring. Very few studies have shown this type impact on the benthic microalgal [24] found that D. geminata proliferations altered benthic diatom community composition and biomass, but with a minimal impact on overall diatom assemblage composition. The great similarity among the invaded rivers founds in this study, complements those results, and is an indication of the strong transformer capacity of D. geminata, which is capable of leading to a community structure which is more homogeneous and different than those of the non-invaded rivers and disrupting the biogeographic heterogeneity of the invaded area.…”

Section: Discussionmentioning

confidence: 99%

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Community signals of the effect of Didymosphenia geminata (Lyngbye) M. Schmidt on benthic diatom communities in Chilean rivers

Pereira

Pérez

2019

Rev. Chil. de Hist. Nat.

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Background: Didymosphenia geminata (Lyngbye) M. Schmidt is a freshwater invasive benthic diatom native to oligotrophic systems of the Northern Hemisphere. Since 2010, freshwater systems of south-austral Chile, have experienced a progressive invasion of this species between 37°18′ S and 54°30′ S. This invaded area is characterized by biogeographic heterogeneity, anthropic pressure and lack of knowledge. The objective of this study was to analyze the effect of D. geminata on the community structure of benthic diatoms and the variability of this effect in Chilean rivers. Methods: The data were collected between 2010 and 2017 and pre-treated using fourth-root transformation to construct a Bray-Curtis similarity matrix and a Principal Coordinate Analysis to identify groups of sites. The α diversity and β diversity were estimated and compared using univariate indexes and the Mann-Whitney test, respectively. We used Permutational multivariate analyses of variance (PERMANOVA) and PERMDISP to estimate the spatial variation of communities, and an Analysis of Percentage Similarity (SIMPER) was performed to identify the species which contributed to the similarity between the groups of sites. Results: The results suggest significant differences between invaded and noninvaded rivers (54% of the total variation); the univariate indexes showed greater richness (S), greater diversity (H′), and less species turnover in invaded rivers. The PERMANOVA indicated significant interaction between D. geminata and the basins; there was also a significant effect on the internal dispersion in the basins. The SIMPER analysis showed that the groups composed exclusively of invaded sites had high mean similarity in all basins and small pedunculated benthic diatoms showed a significant response to the presence of D. geminata. Conclusion: We found high variability in the community structures, that determine a strong segregation between noninvaded and invaded sites by D. geminata, and that the main effect of D. geminata on diatoms benthic was the homogenization of the communities. This is reflected in the increase in density of small stalked diatoms and the reduction of species turnover among rivers in the same basin, leading to the loss of community heterogeneity that overcomes the spatial heterogeneity in the area invaded in Chile.

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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

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Community signals of the effect of Didymosphenia geminata (Lyngbye) M. Schmidt on benthic diatom communities in Chilean rivers

Pereira

Pérez

2019

Rev. Chil. de Hist. Nat.

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“…Blooms of Didymo were shown to influence surrounding algae, invertebrates, and vertebrates. Mats of Didymo changed the diversity and structure of surrounding periphyton assemblages (Gillis and Lavoie, 2014).…”

Section: Nuisance Bloom Forming and Harmful Algaementioning

confidence: 99%

Substratum‐Associated Microbiota

Furey

Liess

2015

Water Environment Research

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This review of literature on substratumassociated microbiota from 2014 highlights topics on benthic algae and bacteria from a range of aquatic environments, but focuses on freshwater habitats. Advances in pollution and toxin detection, assessment methods, and applications of new technologies are highlighted as are updates in taxonomy and systematics. Aspects of general ecology, water quality, nutrient cycling, trophic interactions, land use changes, biofuels, biofouling, and environmental challenges such as climate change, pollutants, tar sands and fracking, oil spills and nuisance blooms are presented.

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“…Its invasiveness stems from the ability to form nuisance blooms in cool, nutrientpoor waters that are prime habitat for trout and other game and non-game fish (Spaulding & Elwell, 2007;Sundareshwar et al, 2011). Impacts to base trophic levels (Gillis & Lavoie, 2014) and primary consumers (Rost & Fritsen, 2014) have also been documented, which together represent a conservation threat to the diversity, functioning, and recreational use of aquatic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Environmental DNA genetic monitoring of the nuisance freshwater diatom, Didymosphenia geminata, in eastern North American streams

Keller

Hilderbrand

Shank

et al. 2017

Diversity and Distributions

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Aim Establishing the distribution and diversity of populations in the early stages of invasion when populations are at low abundance is a core challenge for conservation biologists. Recently, genetic monitoring for environmental DNA (eDNA) has become an effective approach for the early detection of invaders, especially for microscopic organisms where visual detection is challenging. Didymosphenia geminata is a globally distributed freshwater diatom that shows a recent emergence of nuisance blooms, but whose native versus exotic status in different areas has been debated. We address the hypothesis that the distribution and genetic diversity of D. geminata in eastern North America is related to the recent introduction of non-native lineages, and contrast that with the alternative hypothesis that D. geminata is cryptically native to the region (i.e. at low abundance) and only forms nuisance blooms when triggered by a change in environment.Location The Mid-Atlantic region of North America.Methods We analysed 118 stream samples for D. geminata eDNA, validated our results for a subset of sites using direct visual enumeration by microscopy and used molecular cloning to sequence D. geminata from two sites where eDNA was detected. Results(1) D. geminata eDNA was detected at seven spatially unique sites, six of which were previously documented to contain recent D. geminata blooms.(2) Sites where D. geminata eDNA was detected exhibited no difference in environmental conditions compared to sites with no-detected D. geminata eDNA.(3) Sequencing of D. geminata eDNA showed that blooms were composed of multiple genetic lineages, closely related to those sampled elsewhere across the globe.Main conclusions We interpret these results as most consistent with the hypothesis that D. geminata is an exotic invader in the Mid-Atlantic region, still in its early stages of invasion; thus, genetic monitoring and management efforts may still be effective at controlling its spread.

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A preliminary assessment of the effects ofDidymosphenia geminatanuisance growths on the structure and diversity of diatom assemblages of the Restigouche River basin, Quebec, Canada

Cited by 15 publications

References 20 publications

Community signals of the effect of Didymosphenia geminata (Lyngbye) M. Schmidt on benthic diatom communities in Chilean rivers

Community signals of the effect of Didymosphenia geminata (Lyngbye) M. Schmidt on benthic diatom communities in Chilean rivers

Substratum‐Associated Microbiota

Environmental DNA genetic monitoring of the nuisance freshwater diatom, Didymosphenia geminata, in eastern North American streams

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