scholarly journals Benthic Diatom Communities of a Large Mediterranean River under the Influence of a Thermal Effluent

2018 ◽  
Vol 08 (02) ◽  
pp. 104-125
Author(s):  
Luis Quevedo ◽  
Carles Ibáñez ◽  
Nuno Caiola
Keyword(s):  
Benthic Diatom ◽  
Mediterranean River ◽  
Thermal Effluent ◽  
Diatom Communities

scholarly journals Indicator taxa of benthic diatom communities: a case study in Mediterranean streams

2007 ◽  
Vol 43 (1) ◽  
pp. 1-11 ◽  
Author(s):  
E. Tornés ◽  
J. Cambra ◽  
J. Gomà ◽  
M. Leira ◽  
R. Ortiz ◽  
...  
Keyword(s):  
Benthic Diatom ◽  
Mediterranean Streams ◽  
Indicator Taxa ◽  
Diatom Communities

scholarly journals Ecological memory mitigates negative impacts of disturbance on biomass production in benthic diatom metacommunities

2020 ◽  
Author(s):  
Friederike G. Engel ◽  
Birte Matthiessen ◽  
Rosyta Andriana ◽  
Britas Klemens Eriksson
Keyword(s):  
Benthic Diatom ◽  
Species Pool ◽  
Intertidal Flat ◽  
Ecological Communities ◽  
Response Diversity ◽  
Extreme Heat Events ◽  
Ecological Memory ◽  
Mechanical Disturbance ◽  
Diatom Communities ◽  
Negative Impacts

AbstractDisturbance events to coastal habitats such as extreme heat events, storms, or floods have increased in magnitude and frequency in recent years due to anthropogenic climate change and the destruction of habitats. These events constitute a major threat to many ecological communities and global biodiversity. Disturbance history influences ecosystem response to novel disturbances such that communities that have previously been exposed to disturbances should be more resilient to new disturbances compared to previously sheltered communities. This principle is defined as ecological memory. Resilience should also increase with access to a larger species pool, because a larger species pool increases species and response diversity of a community. One possibility of increasing the local species pool is connectivity via adequate dispersal between habitat patches with different species compositions in metacommunities. In a laboratory experiment, we exposed benthic diatom communities of different origin to a mechanical disturbance, simulated dispersal in half of the communities, and measured their chlorophyll a concentration over time. The local diatom communities originated from different locations on an intertidal flat that varied in hydrodynamic exposure history. Hydrodynamic exposure disturbs the sediment, and thereby determines sediment properties and the composition of intertidal diatom communities. In the experiment, disturbance negatively affected chlorophyll a concentration across all treatments. However, the response to disturbance depended on the ecological memory of the communities; the more exposed areas the communities originated from, the less negative was the effect of the mechanical disturbance. Interestingly, dispersal did not mitigate the negative impacts of disturbance in any of the communities. Our results highlight the importance of ecological memory for ecosystem functioning and demonstrate the limitations of patch connectivity to alleviate the impacts of disturbance events in metacommunities.

Assessing anthropogenic pressures on streams: A random forest approach based on benthic diatom communities

2017 ◽  
Vol 586 ◽  
pp. 1101-1112 ◽  
Author(s):  
Floriane Larras ◽  
Romain Coulaud ◽  
Edwige Gautreau ◽  
Elise Billoir ◽  
Juliette Rosebery ◽  
...  
Keyword(s):  
Random Forest ◽  
Benthic Diatom ◽  
Anthropogenic Pressures ◽  
Diatom Communities

scholarly journals An exploratory study of benthic diatom communities in stormwater ponds of different land uses and varying biocide contamination

2020 ◽  
Vol 54 (3) ◽  
pp. 761-774 ◽  
Author(s):  
Greta Minelgaite ◽  
Nikki van Alst ◽  
Diana Agnete Stephansen ◽  
Ulla Elisabeth Bollmann ◽  
Kai Bester ◽  
...  
Keyword(s):  
Exploratory Study ◽  
Benthic Diatom ◽  
Land Uses ◽  
Stormwater Ponds ◽  
Diatom Communities

Benthic diatom communities as indicators of anthropogenic metal contamination at Casey Station, Antarctica

2005 ◽  
Vol 33 (4) ◽  
pp. 499-513 ◽  
Author(s):  
Laura Cunningham ◽  
Ben Raymond ◽  
Ian Snape ◽  
Martin J. Riddle
Keyword(s):  
Metal Contamination ◽  
Benthic Diatom ◽  
Diatom Communities ◽  
Casey Station

Is the biological classification of benthic diatom communities concordant with ecotypes?

Hydrobiologia ◽  
2012 ◽  
Vol 695 (1) ◽  
pp. 43-55 ◽  
Author(s):  
Elisabet Tornés ◽  
Manel Leira ◽  
Sergi Sabater
Keyword(s):  
Benthic Diatom ◽  
Biological Classification ◽  
Diatom Communities

Intra-annual fluctuations dominating temporal dynamics of benthic diatom assemblages in a Chinese mountainous river

2020 ◽  
Vol 56 ◽  
pp. 22
Author(s):  
Shuhan Guo ◽  
Fengzhi He ◽  
Tao Tang ◽  
Lu Tan ◽  
Qinghua Cai
Keyword(s):  
Community Dynamics ◽  
Environmental Changes ◽  
Temporal Dynamics ◽  
Multivariate Time Series ◽  
Multiple Scale ◽  
Benthic Diatom ◽  
Diatom Community ◽  
Diatom Communities ◽  
Mountainous River

Understanding temporal dynamics of community may provide insights on biological responses under environmental changes. However, our knowledge on temporal dynamics of river organisms is still limited. In the present study, we employed a multivariate time-series modeling approach with a long-term dataset (i.e. 72 consecutive months) to investigate temporal dynamics of benthic diatom communities in four sites located in a Chinese mountainous river network. We hypothesized that: (1) there are multi-scale temporal dynamics within the diatom community; (2) intra-annual fluctuations dominate the community dynamics; (3) diatom species composing the community respond distinctly to environmental changes. We found that intra-annual fluctuations with periodicities <12 months explained 8.1–16.1% of community variation. In contrast, fluctuations with periodicities of 13–36 months and 37–72 months only accounted for 1.1–5.9% and 2.8–9.7% of variance in diatom community dynamics, respectively. Taxa correlating significantly to each significant RDA axis (namely, RDA taxa group) displayed distinct temporal dynamics. Conductivity, total nitrogen, and pH were important to most RDA taxa groups across the four sites while their effects were group-specific. We concluded that intra-annual dynamics dominated temporal variation in diatom communities due to community responses to local environmental fluctuations. We suggest that long-term monitoring data are valuable for identifying multiple-scale temporal dynamics within biological communities.

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