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001-es BibID:	BIBFORM058677
Első szerző:	Árva Diána (hidrobiológus)
Cím:	The relative importance of spatial and environmental processes in distribution of benthic chironomid larvae within a large and shallow lake / Diána Árva, Mónika Tóth, Hajnalka Horváth, Sándor A. Nagy, András Specziár
Dátum:	2014
ISSN:	0018-8158
Megjegyzések:	Although chironomids are popular modelorganisms in ecological research and indicators ofbioassessment, the relative role of dispersal andenvironmental filtering in their community assemblyis still poorly known, especially at fine spatial scales.In this study, we applied a metacommunity frameworkand used various statistical tools to examine therelative role of spatial and local environmental factorsin distribution of benthic chironomid taxa and theirassemblages in large and shallow Lake Balaton,Hungary. Contrary to present predictions on themetacommunity organisation of aquatic insects withwinged terrestrial adults, we found that dispersallimitation can considerably affect distribution ofchironomids even at lake scale. However, we alsorevealed the predominant influence of environmentalfiltering, and strong taxa?environment relationshipswere observed especially along sediment type, sedimentorganic matter content and macrophyte coveragegradients. We account that identified reference conditionsand assemblages along with specified optima andtolerances of the abundant taxa can contribute to ourunderstanding of chironomid ecology and be utilisedin shallow lake bioassessment. Further, we proposethat predictive models of species?environment relationshipsshould better take into account pure spatialstructuring of local communities and species-specificvariability of spatial processes and environmentalcontrol even at small spatial scales.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Hydrobiologia. - 742 : 1 (2014), p. 249-266. -
További szerzők:	Tóth Mónika (1983-) Horváth Hajnalka Nagy Sándor Alex (1956-) (hidrobiológus) Specziár András
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001-es BibID:	BIBFORM058678
Első szerző:	Tóth Mónika
Cím:	Species diversity and abundance of plant-dwelling chironomids across hierarchical habitat and seasonal scales in the oxbow lakes of River Tisza, Hungary / Tóth Mónika, Árva Diána, Nagy Sándor A., Specziár András
Dátum:	2013
ISSN:	1863-9135
Megjegyzések:	In temperate regions, plant-dwelling chironomids can be considered as cyclic colonizers that inhabit seasonally ephemeral submerged and floating-leaved macrophytes. In this study, patterns of abundance and species richness of plant-dwelling chironomids were investigated within and among stands of three macrophyte species in oxbow lakes along River Tisza (Hungary). Chironomids colonized macrophytes rapidly and most species occupied the habitat before it had completely developed in June. Assemblage structure and abundance of particular species varied considerably between plant species, oxbow lakes and summer months in a characteristic succession from June to August indicating the presence of dynamic selection mechanisms. Abundance of most species, except Endochironomus tendens, total chironomid abundance, within-sample and total species diversity were highest on the submerged plant Ceratophyllum demersum, and most species occurred at the beginning of the colonization succession, in June. The contribution of oxbow lakes (20.3 %) and the month sampled (20.3 %) to total chironomid diversity was higher than would be expected by chance alone and the contribution of within (19.7 %) and between samples (13.5 %) to total chironomid diversity was lower than would be expected by chance alone. We conclude that regional biodiversity conservation action plans should include multiple habitats. Moreover, the significant seasonal species turnover proved the need for seasonal sampling to assess accurately the total diversity of chironomids in the system.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Fundamental and Applied Limnology = Archiv für Hydrobiologie. - 182 : 4 (2013), p. 309-321. -
További szerzők:	Árva Diána (1988-) (hidrobiológus) Nagy Sándor Alex (1956-) (hidrobiológus) Specziár András
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