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Density- and time-dependent bioturbation effect of Limnodrilus hoffmeisteri on allelopathic cyanobacterial suppression of Myriophyllum spicatum

Density- and time-dependent bioturbation effect of Limnodrilus hoffmeisteri on allelopathic... The bioturbation effect of the typical zoobenthos freshwater worm Limnodrilus hoffmeisteri on the allelopathic cyanobacterial inhibition of the submerged macrophyte Myriophyllum spicatum was investigated. Different worm densities induced different stress responses and affected the allelopathic profile of M. spicatum. Coculture of L. hoffmeisteri and M. spicatum initially led to increases in the turbidity of the water column and in total nitrogen, total phosphorus, and NH4+-N contents. After 14 days of coculture, the growth and photosynthesis rate in M. spicatum significantly decreased compared with the control. The bioturbation effect of L. hoffmeisteri on cyanobacterial inhibition and the concentration of allelochemicals in M. spicatum also depended on the duration of coculture and worm density. Analysis of the culture filtrate obtained a various time points (7–28 days) after initiating coculture of the worm and macrophyte revealed that the inhibitory rates followed the order of worm density of medium density > high density > low density > control. The cyanobacterial inhibitory effects of the tissue extracts varied according to coculture duration among the four treatments, with the medium density treatment having the greatest inhibitory effects after coculture for 14 days. In addition, the concentrations of three allelochemicals, namely, palmitic acid, stearic acid, and cis-9-octadecenoic acid, in the culture filtrates or in M. spicatum tissue extracts were affected by L. hoffmeisteri, where the effects depended on worm density and length of coculture time. Among the four treatments, the contents of the individual allelochemicals were highest in the medium density treatment and the contents increased with increasing coculture time. Moderate stress under a medium worm density after coculture for 14–21 days significantly enhanced the cyanobacterial suppression of M. spicatum and allelochemical production. These results suggest that restoring M. spicatum and L. hoffmeisteri to a reasonable ratio could facilitate cyanobacterial control in eutrophic water bodies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aquatic Sciences Springer Journals

Density- and time-dependent bioturbation effect of Limnodrilus hoffmeisteri on allelopathic cyanobacterial suppression of Myriophyllum spicatum

Zuo, Shengpeng; Yao, Cunjing; Yang, Hao; Li, Yi
Aquatic Sciences , Volume 85 (3) – Jul 1, 2023
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References (62)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
1015-1621
eISSN
1420-9055
DOI
10.1007/s00027-023-00978-4
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Abstract

The bioturbation effect of the typical zoobenthos freshwater worm Limnodrilus hoffmeisteri on the allelopathic cyanobacterial inhibition of the submerged macrophyte Myriophyllum spicatum was investigated. Different worm densities induced different stress responses and affected the allelopathic profile of M. spicatum. Coculture of L. hoffmeisteri and M. spicatum initially led to increases in the turbidity of the water column and in total nitrogen, total phosphorus, and NH4+-N contents. After 14 days of coculture, the growth and photosynthesis rate in M. spicatum significantly decreased compared with the control. The bioturbation effect of L. hoffmeisteri on cyanobacterial inhibition and the concentration of allelochemicals in M. spicatum also depended on the duration of coculture and worm density. Analysis of the culture filtrate obtained a various time points (7–28 days) after initiating coculture of the worm and macrophyte revealed that the inhibitory rates followed the order of worm density of medium density > high density > low density > control. The cyanobacterial inhibitory effects of the tissue extracts varied according to coculture duration among the four treatments, with the medium density treatment having the greatest inhibitory effects after coculture for 14 days. In addition, the concentrations of three allelochemicals, namely, palmitic acid, stearic acid, and cis-9-octadecenoic acid, in the culture filtrates or in M. spicatum tissue extracts were affected by L. hoffmeisteri, where the effects depended on worm density and length of coculture time. Among the four treatments, the contents of the individual allelochemicals were highest in the medium density treatment and the contents increased with increasing coculture time. Moderate stress under a medium worm density after coculture for 14–21 days significantly enhanced the cyanobacterial suppression of M. spicatum and allelochemical production. These results suggest that restoring M. spicatum and L. hoffmeisteri to a reasonable ratio could facilitate cyanobacterial control in eutrophic water bodies.

Journal

Aquatic Sciences – Springer Journals

Published: Jul 1, 2023

Keywords: Allelopathic cyanobacterial suppression; Allelochemical inducement; Integrated pressure; Limnodrilus hoffmeisteri; Myriophyllum spicatum

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