Spatial and temporal variations of Cocconeis placentula var. euglypta (Ehrenb.) 1854 Grunow, 1884 in drift and periphyton

En, Gari; Mc, Corigliano

doi:10.1590/s1519-69842007000400002

Cited by 9 publications

(4 citation statements)

References 15 publications

(14 reference statements)

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“…Wu et al 2013), which consequently alter the benthic assemblage composition at later successional stages (Schneck et al 2011). Accordingly, in our study we observed strong substrate specific differences, with Cocconeis dominating in the smoother microsubstrate surfaces, where its firmly attachment mode presents a greater resistance to the drag forces of the flow (Gari and Corigliano 2007). Potential differences in substrate availabilities and qualities might be responsible for the observed differences in Cocconeis abundances between channels.…”

Section: Discussionmentioning

confidence: 49%

Changes in Coastal Benthic Algae Succession Trajectories and Assemblages Under Contrasting Nutrient and Grazer Loads

Fricke

Kopprio

Alemany

et al. 2015

Estuaries and Coasts

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Eutrophication plays a crucial role in coastal systems, driving changes in the composition and abundance of flora and fauna with consequent effects for the entire ecosystem. Sensitive to nutrient levels, micro-and macroalgal blooms serve as valuable indicators of eutrophication. The San Antonio Bay (Northern Argentinean Patagonia, 40°43′ S, 64°56′ W) provides an appropriate system to study in situ eutrophication processes on coastal communities. In a multiscale approach, using two different kind of settlement substrates (micro: polyethylene terephthalate, and macro: ceramic), the present study followed benthic algal dynamics over one year, distinguishing changes in natural succession and seasonality. Strong differences were found in the biofilm assemblages after three days, marked by tube dwelling diatoms and Cocconeis spp. under high nutrient-grazer conditions and needle like diatoms (e.g. Nitzschia spp., Tabularia spp.) under lower nutrient-grazer loads. The succession continued by the colonization of macroalgae, with a higher recruitment rate in the nutrient and grazer rich environment with a concomitant higher diversity. Our results show that under higher nutrientgrazer conditions natural benthic succession not only differs in trajectory but in its final taxa composition promoting higher biodiversity and biomass accumulation. In addition, taxa specific substrate preferences interfere with the observed eutrophication pattern, suggesting substrate dependant interrelations between the bloom forming taxa. These findings provide evidence that nutrient enrichment can not only affect an established assemblage but also affect the early succession stages, changing the succession trajectory and thus the final assemblage.

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Section: Discussionmentioning

confidence: 49%

Changes in Coastal Benthic Algae Succession Trajectories and Assemblages Under Contrasting Nutrient and Grazer Loads

Fricke

Kopprio

Alemany

et al. 2015

Estuaries and Coasts

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“…, Marks and Power ). In a Mediterranean river, C. pediculus as well as Achnanthes minutissimi were common on C. glomerata and co‐occurring macrophytes (Compte and Cazaubon ), and Cocconeis placentula var euglypta was prominent over winter on Argentinian river Cladophora (Gari and Corigliano ), whereas in a Kenyan highland stream, Cladophora supported 60 diatom species, of which Cyclotella meneghiniana and Fragilaria brevistriata were common (Mpawenayo and Mathooko ) and Gomphonema and Synedra species were common on Cladophora from a Thai river (Bergey et al. ).…”

Section: Algal Epiphytes and Associates Of Cladophoramentioning

confidence: 99%

The Genus Cladophora Kützing (Ulvophyceae) as a Globally Distributed Ecological Engineer

Zulkifly

Graham

Young

et al. 2013

Journal of Phycology

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The green algal genus Cladophora forms conspicuous nearshore populations in marine and freshwaters worldwide, commonly dominating peri-phyton communities. As the result of human activities, including the nutrient pollution of nearshore waters, Cladophora-dominated periphyton can form nuisance blooms. On the other hand, Cladophora has ecological functions that are beneficial, but less well appreciated. For example, Cladophora has previously been characterized as an ecological engineer because its complex structure fosters functional and taxonomic diversity of benthic microfauna. Here, we review classic and recent literature concerning taxonomy, cell biology, morphology, reproductive biology, and ecology of the genus Cladophora, to examine how this alga functions to modify habitats and influence littoral biogeochemistry. We review the evidence that Cladophora supports large, diverse populations of microalgal and bacterial epiphytes that influence the cycling of carbon and other key elements, and that the high production of cellulose and hydrocarbons by Cladophora-dominated periphyton has the potential for diverse technological applications, including wastewater remediation coupled to renewable biofuel production. We postulate that well-known aspects of Cladophora morphology, hydrodynamically stable and perennial holdfasts, distinctively branched architecture, unusually large cell and sporangial size and robust cell wall construction, are major factors contributing to the multiple roles of this organism as an ecological engineer.

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“…3 a, b, and c). This species of diatoms is a common component of periphyton, and can be scraped off the surface of snail shells by benthic organisms, which feed on epiphytic organisms [26,27] . C. placentula can also be found in the digestive tube of the freshwater snails that feed on periphyton [28] .…”

Section: Resultsmentioning

confidence: 99%

Physidae (Mollusca: Gastropoda) of western and central European range - morphological diversification and ecological features

Cieplok¹,

Anderson²,

Gawlak³

et al. 2021

Preprint

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Background: This is the first comparative study on Physidae identified in west and central Europe range. A thorough exploration of morphology supported by ecological features and distribution of European Physidae species are presented within this study. In the context of the lack of research on detailed morphology features on Physidae species we deeply analysed taxonomical features of snails which are being identified more and more frequently in the last years in the territory of the west and central Europe. Scanning electron microscopy (SEM) methods were used to elucidate the external morphology of freshwater snails (Mollusca: Gastropoda: Physidae), that occur in the area of western and central part of Europe. We compared the external morphology of their shells and found important differences between the species. Results: Morphological analysis are benefited in revealing variations of Physide shells. We found intraspecific similarities within Physidae, which are the most evident in the overall structure of shells and the height of the spires. Many interspecific differences in morphology in the apex structure and spires were found. From our results, we can infer that the shells P. fontinalis and A. hypnorum had the lowest amount of variability between particular individuals. The most characteristic features and differences of representatives of Physidae are presented and discussed. This is especially important in Physa gyrina and a worldwide invader Physa acuta identification which is shape-wise not easy to distinguish.Conclusions: The implications of our study are new identification key along with the ecological characteristic of physid species and the assessment of their current range in Europe. Our data demonstrate similarities within Physidae, which are the most evident in the overall structure of shells, and the height of the spires, apex structure, and spires were found between analysed species and provide further evidence of the importance of morphological features as an identification driver.

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Spatial and temporal variations of Cocconeis placentula var. euglypta (Ehrenb.) 1854 Grunow, 1884 in drift and periphyton

Cited by 9 publications

References 15 publications

Changes in Coastal Benthic Algae Succession Trajectories and Assemblages Under Contrasting Nutrient and Grazer Loads

Changes in Coastal Benthic Algae Succession Trajectories and Assemblages Under Contrasting Nutrient and Grazer Loads

The Genus Cladophora Kützing (Ulvophyceae) as a Globally Distributed Ecological Engineer

Physidae (Mollusca: Gastropoda) of western and central European range - morphological diversification and ecological features

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