Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences

Globally, the establishment of protected reserves contributes positively to species protection but also presents a real threat of unexpected changes. A few reports showed that progressively increasing the number of roosting and breeding cormorants across Europe was associated with food-rich water bo...

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Autores principales:	Agnieszka Napiórkowska-Krzebietke, Krystyna Kalinowska, Elżbieta Bogacka-Kapusta, Konrad Stawecki, Piotr Traczuk
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Cyanobacterial blooms Annual persistence Great cormorant Trophic efficiency Freshwater quality Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/7728074205fc427abee52bb3743ddd73
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spelling	oai:doaj.org-article:7728074205fc427abee52bb3743ddd732021-12-01T04:45:54ZPersistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences1470-160X10.1016/j.ecolind.2021.107421https://doaj.org/article/7728074205fc427abee52bb3743ddd732021-05-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21000868https://doaj.org/toc/1470-160XGlobally, the establishment of protected reserves contributes positively to species protection but also presents a real threat of unexpected changes. A few reports showed that progressively increasing the number of roosting and breeding cormorants across Europe was associated with food-rich water bodies. Our studies concerned detailed and novel research on annual cyanobacterial growth against other ecological factors, that is, biotic (ciliates, rotifers, cladocerans, and copepods) and abiotic (temperature, nutrients) factors, in a lake where the piscivorous great cormorants evidently affects the water quality. Mass development of cyanobacteria lasted throughout the whole of the ice-free months (March–December). However, in the under-ice period they also formed a relatively high biomass, suggesting an annual persistence. The potentially toxic filamentous Pseudanabaena, Aphanizomenon, Planktothrix, and Limnothrix were constant dominants in the cyanobacteria-dominated phytoplankton almost year round. Water temperature played a major role in stimulating the growth of filamentous cyanobacteria. However, nitrogen, phosphorus, and even some zooplankters were significantly related to cyanobacteria. A very low trophic efficiency suggested a reduced energy flow at a lower food-web level starting from dominant cyanobacteria. Our results also suggest that numerous breeding colonies of great cormorant contributed to bottom-up (nutrients) and top-down (predation on fish) controls and consequently to the formation of a site-specific refuge for filamentous cyanobacteria. This affects the functioning of the water ecosystem by disturbing the energy flow in the classical food webs, which is important in water management and warming-induced global problems with cyanobacterial dominance and water quality.Agnieszka Napiórkowska-KrzebietkeKrystyna KalinowskaElżbieta Bogacka-KapustaKonrad StaweckiPiotr TraczukElsevierarticleCyanobacterial bloomsAnnual persistenceGreat cormorantTrophic efficiencyFreshwater qualityEcologyQH540-549.5ENEcological Indicators, Vol 124, Iss , Pp 107421- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Cyanobacterial blooms Annual persistence Great cormorant Trophic efficiency Freshwater quality Ecology QH540-549.5
spellingShingle	Cyanobacterial blooms Annual persistence Great cormorant Trophic efficiency Freshwater quality Ecology QH540-549.5 Agnieszka Napiórkowska-Krzebietke Krystyna Kalinowska Elżbieta Bogacka-Kapusta Konrad Stawecki Piotr Traczuk Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences
description	Globally, the establishment of protected reserves contributes positively to species protection but also presents a real threat of unexpected changes. A few reports showed that progressively increasing the number of roosting and breeding cormorants across Europe was associated with food-rich water bodies. Our studies concerned detailed and novel research on annual cyanobacterial growth against other ecological factors, that is, biotic (ciliates, rotifers, cladocerans, and copepods) and abiotic (temperature, nutrients) factors, in a lake where the piscivorous great cormorants evidently affects the water quality. Mass development of cyanobacteria lasted throughout the whole of the ice-free months (March–December). However, in the under-ice period they also formed a relatively high biomass, suggesting an annual persistence. The potentially toxic filamentous Pseudanabaena, Aphanizomenon, Planktothrix, and Limnothrix were constant dominants in the cyanobacteria-dominated phytoplankton almost year round. Water temperature played a major role in stimulating the growth of filamentous cyanobacteria. However, nitrogen, phosphorus, and even some zooplankters were significantly related to cyanobacteria. A very low trophic efficiency suggested a reduced energy flow at a lower food-web level starting from dominant cyanobacteria. Our results also suggest that numerous breeding colonies of great cormorant contributed to bottom-up (nutrients) and top-down (predation on fish) controls and consequently to the formation of a site-specific refuge for filamentous cyanobacteria. This affects the functioning of the water ecosystem by disturbing the energy flow in the classical food webs, which is important in water management and warming-induced global problems with cyanobacterial dominance and water quality.
format	article
author	Agnieszka Napiórkowska-Krzebietke Krystyna Kalinowska Elżbieta Bogacka-Kapusta Konrad Stawecki Piotr Traczuk
author_facet	Agnieszka Napiórkowska-Krzebietke Krystyna Kalinowska Elżbieta Bogacka-Kapusta Konrad Stawecki Piotr Traczuk
author_sort	Agnieszka Napiórkowska-Krzebietke
title	Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences
title_short	Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences
title_full	Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences
title_fullStr	Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences
title_full_unstemmed	Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences
title_sort	persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: ecological indicators and consequences
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/7728074205fc427abee52bb3743ddd73
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Persistent blooms of filamentous cyanobacteria in a cormorant-affected aquatic ecosystem: Ecological indicators and consequences

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