The Seasonal Occurrence of Macroscopic Colonies of Meridion circulare (Bacillariophyceae) in a Spring-Fed Brook

Krejci, Mark E.; Lowe, Rex L.

doi:10.2307/3226316

Cited by 16 publications

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“…It was abundant in an Ohio stream for short periods each spring when water temperatures reached 7-10°C, and subsequently disappeared as water temperatures increased (Krejci and Lowe 1987). In Lake Sophia's streams, M. circulare was present in significant abundance (i.e., >2%) only in the faster, cooler streams and reached its highest values in epilithic habitats.…”

Section: Discussionmentioning

confidence: 97%

Characterization of high arctic stream diatom assemblages from Cornwallis Island, Nunavut, Canada

Antoniades¹,

Douglas²

2002

Can. J. Bot.

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Distinct diatom assemblages often characterize stream habitats, providing the potential to reconstruct past precipitation, snowmelt, and streamflow levels in high arctic watersheds by analyzing fossil assemblages preserved in downstream lake sediments. Diatom assemblages were studied from seven streams and two rivers surrounding Lake Sophia, Cornwallis Island, Nunavut, Canada (75°06′N, 93°36′W). A total of 64 diatom taxa were identified from epilithic and epiphytic assemblages in these lotic habitats. Of these, certain diatom taxa exhibited clear microhabitat preferences. Hannaea arcus (Ehrenberg) Patrick, Achnanthes minutissima (Kützing) Hustedt, Achnanthes petersenii Hustedt, and Meridion circulare (Greville) Agardh were the most common taxa on epilithic substrates, and as a group made up 61-95% of the diatom epilithon. Achnanthes taxa (mainly A. petersenii and A. minutissima) were the dominant taxa in moss habitats, representing between 45 and 73% of the diatom epiphyton. The relative abundance of H. arcus in epilithic habitats was negatively correlated with water temperature (r 2 = 0.71, n = 8). Hannaea arcus was found in greater abundances in cool, fast-flowing streams. This apparent correlation may more closely reflect current speed, which is inversely correlated to temperature in these streams. When these streams discharge into lake basins, the characteristic stream diatoms H. arcus and M. circulare are deposited in lakes. These diatom taxa have the potential to infer past streamflows using paleolimnological techniques.Résumé : Des ensembles distincts de diatomées caractérisent souvent les habitats des rivières, ce qui peut permettre de reconstruire les précipitations, les fontes de neige et les niveaux des cours d'eau dans les bassins hydrologiques du haut arctique, en analysant les ensembles de fossiles conservés dans les sédiments des lacs situés en aval. Les auteurs ont étudié les ensembles de diatomées de sept lacs et de deux rivières entourant le lac Sophia de l'île Cornwallis, au Nunavut, Canada (75°06′N, 93°36′O). Au total, ils ont identifié 64 taxons de diatomées à partir des ensembles épilithes et épiphytes de ces habitats lotiques. Parmi ceux-ci, certains taxons de diatomées montrent de nettes préférences de microhabitat. Les Hannaea arcus (Ehrenberg) Patrick, Achnanthes minutissima (Kützing) Hustedt, Achnanthes petersenii Histedt et Meridion circulare (Greville) Agardh sont les taxons les plus communs sur les substrats épilithes, lesquels comme groupe forment de 61 à 95% des diatomées de l'épilithon. Les taxons d'Achnantes (surtout les A. petersenii et A. minutissima) sont les taxons dominants dans les habitats de mousses, représentant entre 45 et 73% des diatomées de l'épiphyton. L'abondance relative de l'H. arcus dans les habitats épilithes est négativement corrélée avec la température de l'eau (r 2 = 0,71, n = 8). L'H. arcus est plus abondant dans les cours d'eau frais et à écoulement rapide. Cette corré-lation apparente pourrait refléter plus étroitement la vitesse du courant, laquelle est ...

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Section: Discussionmentioning

confidence: 97%

Characterization of high arctic stream diatom assemblages from Cornwallis Island, Nunavut, Canada

Antoniades¹,

Douglas²

2002

Can. J. Bot.

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“…circulare is a pennate araphid diatom with thickened silica ribs (costae) oriented transversely across the valve (Kociolek et al, 2011). It is a widely distributed member of benthic and periphytic (epilithic and epiphytic) communities of various freshwater ecosystems including brooks (Krejci and Lowe, 1987), streams (B-Béres et al, 2016), karstic springs and spring-fed streams (Cantonati and Ortler, 1998;Delgado et al, 2013) and alpine springs (Cantonati and Lange-Bertalot, 2010;Mogna et al, 2015). It forms fan-shaped colonies with cells enclosed within a mucilaginous polysaccharide matrix (Lock et al, 1984).…”

Section: Discussionmentioning

confidence: 99%

“…springs and streams (Margalef, 1949;Symoens, 1957). It is a microthermal species growing abundantly in the cold water within a temperature range of 7-15°C (Whitford, 1960;Krejci and Lowe, 1987), with phosphorus-poor, high-light conditions (Cox, 1993;Hill et al, 2011), all of which conformed to the Krčić Spring.…”

Section: Discussionmentioning

confidence: 99%

Microbial mats as shelter microhabitat for amphipods in an intermittent karstic spring

Žutinić

Petrić

Gottstein

et al. 2018

Knowl. Manag. Aquat. Ecosyst.

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-Microbial mats represent complex communities where cyanobacteria and diatoms as key organisms provide shelter for diverse assemblages of aquatic invertebrates, like the small stygophilous amphipod Synurella ambulans. Studies addressing such communities in the karst springs have rarely examined springheads, and have ignored intermittent springs. During high flow conditions the stygophilic crustaceans are flushed to the surface of a temporary stream Krčić where microbial mats prevent their drift and enables their successful retreat into underground in the periods of drought. The objective of this study was to characterize the microbial mat community of the Krčić Spring as a shelter for S. ambulans during strong current and high water level. Representative samples for diatom and cyanobacterial species identification and composition, as well as the fresh mat material for potential animal activity and cyanobacterial phylogenetic analysis were collected. The most dominant diatom was Achnanthidium minutissimum, whilst Fragilaria capucina, Meridion circulare, Navicula cryptocephala and Nitzschia palea had abundance greater than 0.5%. Morphological observations of cyanobacteria revealed that Phormidium favosum was the most dominant, with Hydrocoleum muscicola as a subdominant. Cyanobacterial phylogenetic relationship revealed two distinct clusters: (i) "Phormidium cluster", confirming morphological observations in both winter and spring samples, and (ii) "Wilmottia cluster", a first report for Croatia and found exclusively in the winter sample. Laboratory observations revealed a small stygophilic amphipod S. ambulans, hiding and feeding inside the pockets of fresh microbial mat. The intermittent Krčić Spring as a predator-free and competitor-free ecosystem provides a spatiotemporal conformity between microbial mat and stygophilous amphipod.Keywords: Microbial mat / cyanobacteria / diatoms / amphipods / karstic spring Résumé -Le tapis microbien comme microhabitat refuge pour les amphipodes dans une source karstique intermittente. Le tapis microbien représente des communautés complexes où les cyanobactéries et les diatomées, en tant qu'organismes clés, abritent divers assemblages d'invertébrés aquatiques, comme les petits amphipodes stygophiles Synurella ambulans. Les études portant sur ces communautés dans les sources karstiques ont rarement examiné ces têtes de ruisseaux et ont ignoré les sources intermittentes. Dans les conditions d'écoulement fort, les crustacés stygophiles sont chassés à la surface d'un ruisseau temporaire Krčić où les tapis microbiens empêchent leur dérive et permettent leur retrait dans le sous-sol en période de sécheresse. L'objectif de cette étude était de caractériser la communauté du tapis microbien de la source Krčić comme abri pour S. ambulans lors de forts courants et de niveaux d'eau élevés. La diatomée la plus dominante était Achnanthidium minutissimum, tandis que Fragilaria capucina, Meridion circulare, Navicula cryptocephala et Nitzschia palea avaient une abondance supérieure à ...

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“…Her investigation demonstrated habitat partitioning among diatoms on sand grains with prostrate diatoms normally occupying depressions while the ridges were occupied by diatom taxa with relatively short and stout flexible stalks that enabled these forms to better resist crushing during sand drifting events. Krejci examined seasonal phenology of epipsammon in a stable spring-fed brook (Krejci & Lowe, 1987a) documenting, among other findings a preferred temperature range for the spring Meridion bloom (Krejci & Lowe, 1987b). Krejci also documented the role of sand grain mineralogy using scanning electron microscopy (SEM) and x-ray energy dispersive spectroscopy technology for sand grain elemental analysis as an influence on diatom colonization.…”

Section: Ecologymentioning

confidence: 95%

Algology and Algologists at Bowling Green, a Short History

Lowe

2006

Hydrobiologia

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The Seasonal Occurrence of Macroscopic Colonies of Meridion circulare (Bacillariophyceae) in a Spring-Fed Brook

Cited by 16 publications

References 0 publications

Characterization of high arctic stream diatom assemblages from Cornwallis Island, Nunavut, Canada

Characterization of high arctic stream diatom assemblages from Cornwallis Island, Nunavut, Canada

Microbial mats as shelter microhabitat for amphipods in an intermittent karstic spring

Algology and Algologists at Bowling Green, a Short History

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