scholarly journals Response of epilithic diatom communities to environmental gradients in subtropical temperate Brazilian rivers

Limnetica ◽  
2010 ◽  
Vol 29 (2) ◽  
pp. 323-340
Author(s):  
Eduardo A. Lobo ◽  
Carlos E. Wetzel ◽  
Luc Ector ◽  
Kazuhiro Katoh ◽  
Saúl Blanco ◽  
...  
Keyword(s):  
Environmental Gradients ◽  
Diatom Communities ◽  
Epilithic Diatom

scholarly journals Response of epilithic diatom communities to environmental gradients along an Ecuadorian Andean River

2018 ◽  
Vol 341 (4) ◽  
pp. 256-263 ◽  
Author(s):  
Pablo Castillejo ◽  
Susana Chamorro ◽  
Luis Paz ◽  
Carla Heinrich ◽  
Ivonne Carrillo ◽  
...  
Keyword(s):  
Environmental Gradients ◽  
Diatom Communities ◽  
Epilithic Diatom

Spatial Response of Epilithic Diatom Communities to Downstream Nutrient Increases

2015 ◽  
Vol 87 (6) ◽  
pp. 547-558 ◽  
Author(s):  
Marilia Schuch ◽  
Maria Angelica Oliveira ◽  
Eduardo A. Lobo
Keyword(s):  
Spatial Response ◽  
Diatom Communities ◽  
Epilithic Diatom

scholarly journals Epilithic diatom communities from areas of invasive Caulerpa species (Caulerpa taxifolia and Caulerpa cylindracea) in the Adriatic Sea, NE Mediterranean

2019 ◽  
Author(s):  
ANA CAR ◽  
ANDRZEJ WITKOWSKI ◽  
NENAD JASPRICA ◽  
STIJEPO LJUBIMIR ◽  
MARIJETA ČALIĆ ◽  
...  
Keyword(s):  
Growth Form ◽  
Adriatic Sea ◽  
Diversity Index ◽  
Light And Electron Microscopy ◽  
Diatom Assemblages ◽  
Wiener Diversity Index ◽  
Diatom Communities ◽  
Ne Mediterranean ◽  
Epilithic Diatom ◽  
Invasive Alga

Epilithic diatom community structures are compared among three locations of the eastern Adriatic Sea coast (Croatia), in the presence of two different invasive Caulerpa species, C. taxifolia and C. cylindracea, which have spread rapidly in the Mediterranean in the last decades. Forty samples were taken seasonally at three sites (island of Hvar, island of Mljet, and Dubrovnik) between November 2008 and October 2010. Light and electron microscopy examinations were used for qualitative analysis. Altogether 310 epilithic taxa belonging to 65 genera were identified. The highest number of these taxa belonged to Mastogloia (48) and Amphora (32), followed by Diploneis (24), Nitzschia (23), Navicula (22), and Cocconeis (19). A similar seasonal shift in growth form structure was observed for epilithic communities at the three sampling sites, where the number of erect group diatoms doubled (Hvar, Mljet) and tripled (Dubrovnik) in spring. Apart from erect forms, Dubrovnik and Mljet were characterised by adnate forms, while Hvar was characterised by tube-dwelling forms. The highest values of the Shannon-Wiener Diversity Index were recorded in autumn and ranged from 5.26 to 5.34. ANOSIM tests performed on species relative abundance data confirmed that the diatom communities differed significantly between the sampling sites, and that the differences were correlated with the presence of the two species of invasive macroalgae (Hvar – area of C. taxifolia; Mljet and Dubrovnik – areas of C. cylindracea). As revealed by SIMPER analyses, the group of taxa contributing the most to variance between diatom assemblages from sites of different invasive alga included Cocconeis scutellum var. scutellum, Rhopalodia pacifica, Navicula ramosissima, and Berkeleya rutilans. Although the spatial variation in communities may also reflect the effects of unmeasured environmental variables, the results suggest the possible influence of invasive seaweeds of the genus Caulerpa which may affect the habitat by competing with autochthonous algae. This study contributes to the knowledge of diatom diversity both at regional and at broader scales in these challenged environments.

scholarly journals Epipsammic diatoms in streams influenced by urban pollution, São Carlos, SP, Brazil

2010 ◽  
Vol 70 (4) ◽  
pp. 920-930 ◽  
Author(s):  
T. Bere ◽  
JG. Tundisi
Keyword(s):  
Environmental Gradients ◽  
Urban Pollution ◽  
Base Flow ◽  
Stepwise Multiple Regression ◽  
Study Region ◽  
Diatom Communities ◽  
Physical And Chemical Variables ◽  
Forward Stepwise ◽  
Lotic Environments ◽  
Physical And Chemical

Epipsammic diatoms have important implications for ecosystem processes in lotic environments. Most of the studies on benthic diatoms concentrate on epilithic diatoms and very little is known about epipsammic diatoms. The objective of this study was to assess epipsammic diatom communities in streams in relation to environmental conditions. Epipsammic diatoms and water quality sampling was done at 7 sites during summer base flow period (2008). Forward stepwise multiple regression and canonical correspondence analysis (CCA) were used to determine environmental gradients along which species vary with physical and chemical variables. A total of 112 diatom species distributed among 44 genera were recorded. Altitude and the process of eutrophication played a significant role in structuring diatom communities in the study region.

Spatial Distribution of Epilithic Diatom Communities in the Estuary of Korean Peninsula.

2018 ◽  
Vol 51 (1) ◽  
pp. 1-15
Author(s):  
Ha-Kyung Kim ◽  
◽  
In-Hwan Cho ◽  
Young-Hyo Kim ◽  
Min-Hyuk Lee ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Korean Peninsula ◽  
Diatom Communities ◽  
Epilithic Diatom

Epilithic Diatom Communities in Streams of Jeju Island

2014 ◽  
Vol 32 (1) ◽  
pp. 16-25 ◽  
Author(s):  
Myoung Hwa Jung ◽  
◽  
Hyeon Jin Cho ◽  
Jung Ha Yun ◽  
Hak Young Lee
Keyword(s):  
Jeju Island ◽  
Diatom Communities ◽  
Epilithic Diatom
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