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Seasonal changes in hydrologic conditions affect the balance between deterministic and stochastic processes structuring lotic diatom metacommunity.

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Title: Seasonal changes in hydrologic conditions affect the balance between deterministic and stochastic processes structuring lotic diatom metacommunity.
Authors: Rusanov, Alexander G.1,2,3 (AUTHOR) rusanov.a@spcras.ru, Trábert, Zsuzsa2,3 (AUTHOR), Várbíró, Gábor4 (AUTHOR), Kiss, Keve T.2,3 (AUTHOR), Bíró, Tibor3,5 (AUTHOR), Grigorszky, István6 (AUTHOR), Vadkerti, Edit2 (AUTHOR), Ács, Éva2,3 (AUTHOR)
Source: Hydrobiologia. May2026, Vol. 853 Issue 8, p2439-2462. 24p.
Subjects: Deterministic processes, Stochastic processes, Dispersal (Ecology), Fluvial geomorphology, Aquatic microbiology, Biotic communities, Seasons
Geographic Terms: Danube River
Abstract: We explored seasonal changes in community assembly processes shaping periphytic diatom distribution in hilly streams of the Danube River basin. Particularly, we were interested (1) whether compositional stochasticity of diatom community changes with increasing hydrological disturbance in spring compared to favorable conditions in autumn; (2) how the relative strength of environmental filtering and dispersal-related processes varies across seasons; and (3) whether the relative importance of these processes depends on dispersal abilities of diatom guilds (low-profile, high-profile, motile, and planktic). The compositional stochasticity increased in autumn, indicating that diatom assemblages were more prone to ecological drift in benign hydrological conditions. Variation partitioning showed that environmental filtering remained consistently more important than dispersal-related processes across seasons. The stronger taxonomic homogenization observed for low-profile guild in spring suggests that this guild was influenced by mass effects during high-flow period. Thus, low-profile diatoms were strongly driven by dispersal, while high-profile and motile diatoms were more controlled by the environment. However, the increased role of mass effects was mediated by high abundance and low disturbance sensitivity of low-profile diatoms, rather than their dispersal ability. Overall, our results highlight the important role of hydrology in the balance between deterministic and stochastic processes structuring lotic diatom metacommunities. [ABSTRACT FROM AUTHOR]
Copyright of Hydrobiologia is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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PubType: Academic Journal
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  Data: Seasonal changes in hydrologic conditions affect the balance between deterministic and stochastic processes structuring lotic diatom metacommunity.
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  Data: We explored seasonal changes in community assembly processes shaping periphytic diatom distribution in hilly streams of the Danube River basin. Particularly, we were interested (1) whether compositional stochasticity of diatom community changes with increasing hydrological disturbance in spring compared to favorable conditions in autumn; (2) how the relative strength of environmental filtering and dispersal-related processes varies across seasons; and (3) whether the relative importance of these processes depends on dispersal abilities of diatom guilds (low-profile, high-profile, motile, and planktic). The compositional stochasticity increased in autumn, indicating that diatom assemblages were more prone to ecological drift in benign hydrological conditions. Variation partitioning showed that environmental filtering remained consistently more important than dispersal-related processes across seasons. The stronger taxonomic homogenization observed for low-profile guild in spring suggests that this guild was influenced by mass effects during high-flow period. Thus, low-profile diatoms were strongly driven by dispersal, while high-profile and motile diatoms were more controlled by the environment. However, the increased role of mass effects was mediated by high abundance and low disturbance sensitivity of low-profile diatoms, rather than their dispersal ability. Overall, our results highlight the important role of hydrology in the balance between deterministic and stochastic processes structuring lotic diatom metacommunities. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Hydrobiologia is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10750-025-06084-w
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        Text: English
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        StartPage: 2439
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      – SubjectFull: Deterministic processes
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      – SubjectFull: Stochastic processes
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      – SubjectFull: Dispersal (Ecology)
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      – SubjectFull: Biotic communities
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      – SubjectFull: Seasons
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      – SubjectFull: Danube River
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              Text: May2026
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