Combined eco-morphological functional groups are reliable indicators of colonisation processes of benthic diatom assemblages in a lowland stream

B‐Béres, Viktória; Lukács, Áron; Török, Péter; Kókai, Zsuzsanna; Novàk, Zoltán; T‐Krasznai, Enikő; Tóthmérész, Béla; Bácsi, István

doi:10.1016/j.ecolind.2015.12.031

Cited by 57 publications

(30 citation statements)

References 28 publications

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“…As an alternative to species‐based approaches, use of trait‐based approaches in biomonitoring has been advocated in recent years, in particular because of the demand of mechanistic understanding of biological responses (Baattrup‐Pedersen, Göthe, Riis, Andersen, & Larsen, ). Based on previous studies (B‐Béres et al., ; Lange et al., ; Passy, ; Soininen et al., ), trait composition would track local environment gradients better than species composition and was less dependent on historic (i.e., spatial) factors, making them better suitable for research on global environmental change (Soininen et al., ). Nevertheless, our finding was rather unexpected compared to a recent similar study (Soininen et al., ).…”

Section: Discussionmentioning

confidence: 99%

Hydrological and environmental variables outperform spatial factors in structuring species, trait composition, and beta diversity of pelagic algae

Guse

Makarevičiūtė

et al. 2018

Ecology and Evolution

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There has been increasing interest in algae‐based bioassessment, particularly, trait‐based approaches are increasingly suggested. However, the main drivers, especially the contribution of hydrological variables, of species composition, trait composition, and beta diversity of algae communities are less studied. To link species and trait composition to multiple factors (i.e., hydrological variables, local environmental variables, and spatial factors) that potentially control species occurrence/abundance and to determine their relative roles in shaping species composition, trait composition, and beta diversities of pelagic algae communities, samples were collected from a German lowland catchment, where a well‐proven ecohydrological modeling enabled to predict long‐term discharges at each sampling site. Both trait and species composition showed significant correlations with hydrological, environmental, and spatial variables, and variation partitioning revealed that the hydrological and local environmental variables outperformed spatial variables. A higher variation of trait composition (57.0%) than species composition (37.5%) could be explained by abiotic factors. Mantel tests showed that both species and trait‐based beta diversities were mostly related to hydrological and environmental heterogeneity with hydrological contributing more than environmental variables, while purely spatial impact was less important. Our findings revealed the relative importance of hydrological variables in shaping pelagic algae community and their spatial patterns of beta diversities, emphasizing the need to include hydrological variables in long‐term biomonitoring campaigns and biodiversity conservation or restoration. A key implication for biodiversity conservation was that maintaining the instream flow regime and keeping various habitats among rivers are of vital importance. However, further investigations at multispatial and temporal scales are greatly needed.

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Section: Discussionmentioning

confidence: 99%

Hydrological and environmental variables outperform spatial factors in structuring species, trait composition, and beta diversity of pelagic algae

Guse

Makarevičiūtė

et al. 2018

Ecology and Evolution

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“…For all sampled material, 35 traits in four trait categories were used in the calculation of the functional diversity indices: (a) diatom ecological guilds (Passy, ; Rimet & Bouchez, ); (b) cell size; (c) length/width ratio (e.g., Tapolczai, Bouchez, Stenger‐Kovács, Padisák, & Rimet, 2); and (d) ecomorphological groups; B.‐Béres, ) (Appendix ). These traits had been tested previously and adopted as applicable indicators of ecosystem functioning in soda pans (Stenger‐Kovács et al, ; Appendix ).…”

Section: Methodsmentioning

confidence: 99%

Trait‐based diatom functional diversity as an appropriate tool for understanding the effects of environmental changes in soda pans

Stenger‐Kovács

Lengyel

Buczkó

et al. 2019

Ecology and Evolution

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Saline lakes, among the most seriously endangered ecosystems, are threatened due to climate change and human activities. One valuable feature of these environments is that they constitute areas of high biodiversity. Ecologists are, therefore, under great pressure to improve their understanding of the effects of natural and anthropogenic disturbances on the biodiversity of saline lakes. In this study, a total of 257 samples from 32 soda pans in Central Europe between 2006 and 2015 were examined. The effects of environmental variables and of geographical and limnoecological factors on functional diversity were analyzed. Furthermore, the explanatory power of the trait-based approach was assessed, and the applicability of the indices for biomonitoring purposes was determined. It was found that low habitat heterogeneity and harsh environments lead to the selection of a small number of suitable traits, and consequently, to a naturally low level of functional diversity. Anthropogenic activities enhance diversity at functional level due to the shift toward freshwater characteristics. On the regional scale, the effects of the region and status (natural, degraded, reconstructed) on diatom functional diversity were significant and more pronounced than that of the environmental and other limnoecological factors. The degree of variance found in functional diversity ascribed to environmental variables is five times greater in the case of the application of a trait-based approach, than when a taxonomic one is employed in the literature. Each of the tested functional diversity indices was sensitive to the most important environmental variables. Furthermore, these were type-specific and proved to be more complex indicators than taxonomic metrics. It is possible to suggest four functional diversity indices (FGR, FRic, FDis, and FDiv) which emphasize their independence from substrate and seasonal variations for ecological status assessment and conservation planning. K E Y W O R D Sconservation, diversity indices, ecological status, environmental constrains, saline ecosystems | 321 STENGER-KOVÁCS ET al.

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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%

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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Combined eco-morphological functional groups are reliable indicators of colonisation processes of benthic diatom assemblages in a lowland stream

Cited by 57 publications

References 28 publications

Hydrological and environmental variables outperform spatial factors in structuring species, trait composition, and beta diversity of pelagic algae

Hydrological and environmental variables outperform spatial factors in structuring species, trait composition, and beta diversity of pelagic algae

Trait‐based diatom functional diversity as an appropriate tool for understanding the effects of environmental changes in soda pans

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

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