scholarly journals The arrival and spread of the bloom-forming, freshwater diatom, Didymosphenia geminata, in New Zealand

2011 ◽  
Vol 6 (3) ◽  
pp. 249-262 ◽  
Author(s):  
Cathy Kilroy ◽  
Martin Unwin
Keyword(s):  
New Zealand ◽  
Didymosphenia Geminata ◽  
Freshwater Diatom

Physicochemical predictors of the invasive diatom Didymosphenia geminata at multiple spatial scales in New Zealand rivers

2015 ◽  
Vol 50 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Jonathan Bray ◽  
Jon S. Harding ◽  
Cathy Kilroy ◽  
Paul Broady ◽  
Philippe Gerbeaux
Keyword(s):  
New Zealand ◽  
Spatial Scales ◽  
Didymosphenia Geminata ◽  
Multiple Spatial Scales

scholarly journals Phylogenetic and phylogeographic patterns of Didymosphenia geminata on invaded sites in Chile

2018 ◽  
Author(s):  
Bernardita Cayupe ◽  
Nicole Ehrenfeld ◽  
Rodrigo Moreno ◽  
Fabio A. Labra ◽  
Carolina Díaz
Keyword(s):  
Haplotype Analysis ◽  
Rbcl Gene ◽  
Species Introduction ◽  
Single Population ◽  
Didymosphenia Geminata ◽  
Genetic Sampling ◽  
Alternative Hypotheses ◽  
Genetic Sequences ◽  
Rbcl Gene Sequences ◽  
Freshwater Diatom

Understanding the population dynamics of invasive processes has become a pressing concern in a highly connected world faced with ongoing climate change and increased exotic species introduction. In Chile, the invasive freshwater benthic diatom Didymosphenia geminata (Lyngbye) Schmidt has become widespread, expanding across multiple river basins spanning over 3000 km in three years. Here we evaluate the phylogenetic and phylogeographic relationships of D. geminata samples collected throughout the invaded range in Chile, using specific rbcL gene sequence previously published. Genetic sequences for this marker were generated for 19 sample sites, and were compared with available freshwater diatom sequences, as well as with previously published rbcL gene sequences for D. geminata. We find that all genetic sequences collected within Chile present phylogenetic divergences from D. geminata samples collected in Siberia, as well as from samples of the genera Gomphonema, Cymbella and Encyonema. Thus, we validate the invasion by D. geminata, in agreement with existing morphological taxonomic criteria. In addition, a haplotype analysis showed a total of 13 haplotypes, two of which (halpotypes I and IX) found in 12 and 3 populations respectively, while each of the remaining haplotypes presents a single population. Thus, these results are consistent either with the introduction of multiple lineages, or with a rapid genetic differentiation in this invading freshwater diatom. Further genetic sampling, both within Chile and in countries that may have been potential sources of the invasion are needed to test these alternative hypotheses.

scholarly journals Predicting the potential distribution of the invasive freshwater diatom Lindavia intermedia in New Zealand lakes

2021 ◽  
Vol 16 (3) ◽  
pp. 415-442
Author(s):  
Catherine Kilroy ◽  
Amy Whitehead ◽  
Susanna Wood ◽  
Marcus Vandergoes ◽  
Paul Lambert ◽  
...  
Keyword(s):  
New Zealand ◽  
Potential Distribution ◽  
Freshwater Diatom

scholarly journals Polysaccharide Stalks in Didymosphenia geminata Diatom: Real World Applications and Strategies to Combat Its Spread

2022 ◽  
Vol 3 (1) ◽  
pp. 83-94
Author(s):  
Esther Somanader ◽  
Roshini Sreenivas ◽  
Golnoosh Siavash ◽  
Nicole Rodriguez ◽  
Tingxiao Gao ◽  
...  
Keyword(s):  
Invasive Species ◽  
Metal Adsorption ◽  
Wastewater Remediation ◽  
Didymosphenia Geminata ◽  
The World ◽  
Real World Applications ◽  
Potential Applications ◽  
Biomedical Field ◽  
Cell Adhesion And Proliferation ◽  
Freshwater Diatom

Didymosphenia geminata is a species of freshwater diatom that is known as invasive and is propagating quickly around the world. While invasive species are generally considered a nuisance, this paper attempts to find useful applications for D. geminata in the biomedical field and wastewater remediation. Here, we highlight the polysaccharide-based stalks of D. geminata that enable versatile potential applications and uses as a biopolymer, in drug delivery and wound healing, and as biocompatible scaffolding in cell adhesion and proliferation. Furthermore, this review focuses on how the polysaccharide nature of stalks and their metal-adsorption capacity allows them to have excellent wastewater remediation potential. This work also aims to assess the economic impact of D. geminata, as an invasive species, on its immediate environment. Potential government measures and legislation are recommended to prevent the spread of D. geminata, emphasizing the importance of education and collaboration between stakeholders.

scholarly journals Phylogenetic and phylogeographic patterns of Didymosphenia geminata on invaded sites in Chile

2018 ◽  
Author(s):  
Bernardita Cayupe ◽  
Nicole Ehrenfeld ◽  
Rodrigo Moreno ◽  
Fabio A. Labra ◽  
Carolina Díaz
Keyword(s):  
Haplotype Analysis ◽  
Rbcl Gene ◽  
Species Introduction ◽  
Single Population ◽  
Didymosphenia Geminata ◽  
Genetic Sampling ◽  
Alternative Hypotheses ◽  
Genetic Sequences ◽  
Rbcl Gene Sequences ◽  
Freshwater Diatom

Understanding the population dynamics of invasive processes has become a pressing concern in a highly connected world faced with ongoing climate change and increased exotic species introduction. In Chile, the invasive freshwater benthic diatom Didymosphenia geminata (Lyngbye) Schmidt has become widespread, expanding across multiple river basins spanning over 3000 km in three years. Here we evaluate the phylogenetic and phylogeographic relationships of D. geminata samples collected throughout the invaded range in Chile, using specific rbcL gene sequence previously published. Genetic sequences for this marker were generated for 19 sample sites, and were compared with available freshwater diatom sequences, as well as with previously published rbcL gene sequences for D. geminata. We find that all genetic sequences collected within Chile present phylogenetic divergences from D. geminata samples collected in Siberia, as well as from samples of the genera Gomphonema, Cymbella and Encyonema. Thus, we validate the invasion by D. geminata, in agreement with existing morphological taxonomic criteria. In addition, a haplotype analysis showed a total of 13 haplotypes, two of which (halpotypes I and IX) found in 12 and 3 populations respectively, while each of the remaining haplotypes presents a single population. Thus, these results are consistent either with the introduction of multiple lineages, or with a rapid genetic differentiation in this invading freshwater diatom. Further genetic sampling, both within Chile and in countries that may have been potential sources of the invasion are needed to test these alternative hypotheses.

Impact of Didymosphenia geminata on hyporheic conditions in trout redds: reason for concern?

2008 ◽  
Vol 59 (11) ◽  
pp. 1028 ◽  
Author(s):  
Tobias O. Bickel ◽  
Gerard P. Closs
Keyword(s):  
New Zealand ◽  
Surface Water ◽  
Water Exchange ◽  
Potential Surface ◽  
Didymosphenia Geminata ◽  
Exchange Processes ◽  
Significant Difference ◽  
Hydraulic Conditions ◽  
Groundwater Exchange ◽  
The Impact

Didymosphenia geminata (Lyngbye) Schmidt (commonly called didymo) is an invasive diatom and of concern to fisheries managers in North America and more recently New Zealand. Didymo grows in thick mats in several river systems on the South Island of New Zealand, often smothering entire river beds. Salmonid eggs, deposited in gravel nests (redds), depend on constant water exchange across the riverbed to provide oxygen-rich water for development. Thick didymo mats might restrict the flow of oxygen-rich water into spawning gravels, resulting in increased egg mortality and reduced trout recruitment. The present study measured hyporheic hydraulic conditions in trout redds with varying didymo cover in the Clutha River catchment, South Island, New Zealand. Didymo cover had no significant effects on several hydraulic variables (flow into the substrate, hydraulic conductivity and hyporheic oxygen concentration). However, there was a significant difference in the potential surface water–groundwater exchange between sites, suggesting some effect of didymo on hydraulic conditions. Considering the limited number of replicates, the impact of didymo on trout redds in the Clutha River cannot be excluded. The present study highlights the need for further research on the possible effects of didymo on important surface water–groundwater exchange processes.

A history of freshwater diatom research in New Zealand

1983 ◽  
Vol 11 (2) ◽  
pp. 223-231 ◽  
Author(s):  
VIVIENNE CASSIE
Keyword(s):  
New Zealand ◽  
New Records ◽  
Diatom Flora ◽  
Freshwater Phytoplankton ◽  
The United Kingdom ◽  
History Of ◽  
Nineteenth And Twentieth Centuries ◽  
Late Nineteenth ◽  
Diatom Taxonomy ◽  
Freshwater Diatom

New records to the freshwater diatom flora of New Zealand were made by British and European diatomists in the late nineteenth and twentieth centuries, mainly from collections of interested amateurs. Between 1960 and 1975 several taxonomic papers were published in the United Kingdom on diatomite deposits, and ecological surveys were carried out in New Zealand on freshwater phytoplankton. During the last decade sediment studies have been made and significant contributions on diatom taxonomy have come from European workers.

Laboratory study of the survival and attachment of Didymosphenia geminata (Bacillariophyceae) in water sourced from rivers throughout New Zealand

Phycologia ◽  
2014 ◽  
Vol 53 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Jeanne M. Kuhajek ◽  
Marion Lemoine ◽  
Cathy Kilroy ◽  
S. Craig Cary ◽  
Philippe Gerbeaux ◽  
...  
Keyword(s):  
New Zealand ◽  
Laboratory Study ◽  
Didymosphenia Geminata
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