Regeneration of the Molluscan Fauna of a Small Lowland River after Dredging

1
Andrzej Zawal
Andrzej Zawal
2
Anna Sulikowska-Drozd
Anna Sulikowska-Drozd
3
Edyta Stepien
Edyta Stepien
4
Lukasz Jankowiak
Lukasz Jankowiak
5
Agnieszka Szlauer-Lukaszewska
Agnieszka Szlauer-Lukaszewska
1 University of Szczecin

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Dredging of the river to remove macrophytic vegetation and bottom sediment is a common anthropogenic disturbance in the river ecosystem that directly and indirectly influences benthic invertebrates, including molluscs. We assessed the effect of dredging on malacofauna during the year following such an intervention on the river Krąpiel (NW Poland) and describe the process of gradual recolonization of the dredged parts by gastropods and bivalves as well as its possible sources. Molluscs were adversely impacted immediately after the dredging: relative abundance of rheophilic and species typical of stagnant water or slow-flowing rivers changed and the overall species richness decreased. The fauna recovered to its pre-management state within a year. The BACI analysis showed no long-term effect of the intervention on the total abundance and diversity of the molluscs. As many as 17 mollusc species, among them Unio crassus, were present in the river before and after the dredging.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

Andrzej Zawal. 2016. \u201cRegeneration of the Molluscan Fauna of a Small Lowland River after Dredging\u201d. Global Journal of Science Frontier Research - H: Environment & Environmental geology GJSFR-H Volume 16 (GJSFR Volume 16 Issue H4): .

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Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

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GJSFR-H Classification: FOR Code: 049999
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v1.2

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November 22, 2016

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English

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Dredging of the river to remove macrophytic vegetation and bottom sediment is a common anthropogenic disturbance in the river ecosystem that directly and indirectly influences benthic invertebrates, including molluscs. We assessed the effect of dredging on malacofauna during the year following such an intervention on the river Krąpiel (NW Poland) and describe the process of gradual recolonization of the dredged parts by gastropods and bivalves as well as its possible sources. Molluscs were adversely impacted immediately after the dredging: relative abundance of rheophilic and species typical of stagnant water or slow-flowing rivers changed and the overall species richness decreased. The fauna recovered to its pre-management state within a year. The BACI analysis showed no long-term effect of the intervention on the total abundance and diversity of the molluscs. As many as 17 mollusc species, among them Unio crassus, were present in the river before and after the dredging.

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Regeneration of the Molluscan Fauna of a Small Lowland River after Dredging

Andrzej Zawal
Andrzej Zawal University of Szczecin
Anna Sulikowska-Drozd
Anna Sulikowska-Drozd
Edyta Stepien
Edyta Stepien
Lukasz Jankowiak
Lukasz Jankowiak
Agnieszka Szlauer-Lukaszewska
Agnieszka Szlauer-Lukaszewska

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