scholarly journals Changes in biodiversity and environmental stressors influence community structure of an experimental eelgrass Zostera marina system

2012 ◽  
Vol 470 ◽  
pp. 41-54 ◽  
Author(s):  
RE Blake ◽  
JE Duffy
Keyword(s):  
Community Structure ◽  
Zostera Marina ◽  
Environmental Stressors

Additive response to multiple environmental stressors in the seagrass Zostera marina L.

2018 ◽  
Vol 63 (4) ◽  
pp. 1528-1544 ◽  
Author(s):  
Francisco Moreno‐Marín ◽  
Fernando Guillermo Brun ◽  
Morten Foldager Pedersen
Keyword(s):  
Zostera Marina ◽  
Environmental Stressors

scholarly journals Whole-lake algal responses to a century of acidic industrial deposition on the Canadian Shield

2002 ◽  
Vol 59 (3) ◽  
pp. 483-493 ◽  
Author(s):  
Rolf D Vinebrooke ◽  
Sushil S Dixit ◽  
Mark D Graham ◽  
John M Gunn ◽  
Yu-Wei Chen ◽  
...  
Keyword(s):  
Community Structure ◽  
Light Availability ◽  
Boreal Lakes ◽  
Environmental Stressors ◽  
Algal Community ◽  
Sedimentary Pigments ◽  
Metal Levels ◽  
Lake Acidity ◽  
Algal Abundance ◽  
Acidified Lakes

A century of cultural acidification is hypothesized to have altered algal community structure in boreal lakes. To date, this hypothesis has remained untested because of both the lack of data predating the onset of industrial pollution and incomplete estimates of whole-lake algal community structure. High-pressure liquid chromatography (HPLC) of sedimentary pigments was used to quantify whole-lake algal responses to acid deposition in six boreal lakes located in Killarney Park, Ontario, Canada. Concomitant significant increases in chlorophyll and carotenoid concentrations, diatom-inferred lake acidity, and metal levels since 1900 suggested that algal abundances in four acidified lakes and one small, circumneutral lake were enhanced by aerial pollution. An alternate explanation is that increased acidity and underwater light availability in the acidified lakes shifted algal abundance towards phytobenthos and deepwater phytoplankton, whose pigment signatures were better preserved in the sediments. Taxonomically diagnostic pigment stratigraphies were consistent with shifts in algal community structure towards filamentous green phytobenthos and deepwater phytoflagellates in the acidified lakes. Our findings suggest that decades of aerial pollution have altered the base of foodwebs in boreal lakes, potentially rendering them less resilient to other environmental stressors.

Evidence for regional‐scale controls on eelgrass ( Zostera marina ) and mesograzer community structure in upwelling‐influenced estuaries

2019 ◽  
Vol 64 (3) ◽  
pp. 1120-1134 ◽  
Author(s):  
Jennifer L. Hayduk ◽  
Sally D. Hacker ◽  
Jeremy S. Henderson ◽  
Fiona Tomas
Keyword(s):  
Community Structure ◽  
Zostera Marina ◽  
Regional Scale

scholarly journals Community Structure and Abundance of Archaea in a Zostera marina Meadow: A Comparison between Seagrass-Colonized and Bare Sediment Sites

Archaea ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Pengfei Zheng ◽  
Chuantao Wang ◽  
Xiaoli Zhang ◽  
Jun Gong
Keyword(s):  
Community Structure ◽  
Zostera Marina ◽  
High Throughput Sequencing ◽  
Archaeal Community ◽  
Distribution Patterns ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Absolute Abundance ◽  
Bare Sediment ◽  
Archaeal Communities

Seagrass colonization alters sediment physicochemical properties by depositing seagrass fibers and releasing organic carbon and oxygen from the roots. How this seagrass colonization-induced spatial heterogeneity affects archaeal community structure and abundance remains unclear. In this study, we investigated archaeal abundance, diversity, and composition in both vegetated and adjacent bare surface sediments of a Zostera marina meadow. High-throughput sequencing of 16S rDNA showed that Woesearchaeota, Bathyarchaeota, and Thaumarchaeota were the most abundant phyla across all samples, accounting for approximately 42%, 21%, and 17% of the total archaeal communities, respectively. In terms of relative abundance, Woesearchaeota and Bathyarchaeota were not significantly different between these two niches; however, specific subclades (Woese-3, Woese-21, Bathy-6, Bathy-18) were significantly enriched in vegetated sediments (P<0.05), while Thaumarchaeota was favored in unvegetated sites (P=0.02). The quantification of archaeal 16S rRNA genes showed that the absolute abundance of the whole archaeal community, Bathyarchaeota, and Woese-3, Woese-10, Woese-13, and Woese-21 was significantly more abundant in vegetated sediments than in bare sediments (P<0.05). Our study expands the available knowledge of the distribution patterns and niche preferences of archaea in seagrass systems, especially for the different subclades of Woesearchaeota and Bathyarchaeota, in terms of both relative proportions and absolute quantities.

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