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Coral-macroalgal interactions: Herbivory and substrate type influence growth of the macroalgae Eucheuma denticulatum (N.L. Burman) Collins & Hervey, 1917 on a tropical coral reef

Eggertsen, M and Larsson, J. and Porseryd, T. and Akerlund, C. and Chacin, D. H. and Berkström, Charlotte and Jiddawi, N. and Kautsky, N. and Halling, C. (2021). Coral-macroalgal interactions: Herbivory and substrate type influence growth of the macroalgae Eucheuma denticulatum (N.L. Burman) Collins & Hervey, 1917 on a tropical coral reef. Journal of Experimental Marine Biology and Ecology. 542-543 , 151606
[Research article]

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Abstract

Introduced macroalgae becoming invasive may alter ecological functions and habitats in recipient ecosystems. In the Western Indian Ocean (WIO), non-native strains of the native macroalgae Eucheuma denticulatum were introduced for farming practices and consequently spread into the surrounding seascape. We investigated potential effects of non-native and native strains of this macroalgae on a branching coral. We conducted a four-factor field experiment where we examined growth and holdfast development of introduced and native E. denticulatum on live and dead branches of Acropora sp. in the presence and absence of herbivores in Unguja Island, Zanzibar. Moreover, we estimated coral and macroalgae condition by visual examinations, gene expression analyses, and photosynthetic measurements. Macroalgae did not attach to any live coral and coral condition was not impacted by the presence of E. denticulatum, regardless of geographical origin. Instead, necrotic tissue on the macroalgae in areas of direct contact with corals indicated damage inflicted by the coral. The biomass of E. denticulatum did not differ between the replicates attached to live or dead corals in the experiment, yet biomass was strongly influenced by herbivory and replicates without protection from herbivores had a significantly lower biomass. In the absence of herbivory, introduced E. denticulatum had significantly higher growth rates than native algae based on wet weight measurements. These results contribute to an increased understanding of environmental effects by the farming of a non-native strain of algae on corals and stresses the importance to maintain viable populations of macroalgal feeding fishes in such areas.

Authors/Creators:Eggertsen, M and Larsson, J. and Porseryd, T. and Akerlund, C. and Chacin, D. H. and Berkström, Charlotte and Jiddawi, N. and Kautsky, N. and Halling, C.
Title:Coral-macroalgal interactions: Herbivory and substrate type influence growth of the macroalgae Eucheuma denticulatum (N.L. Burman) Collins & Hervey, 1917 on a tropical coral reef
Series Name/Journal:Journal of Experimental Marine Biology and Ecology
Year of publishing :2021
Volume:542-543
Article number:151606
Number of Pages:12
ISSN:0022-0981
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Introduced species, Coral-macroalgal interactions, Herbivory, Eucheuma denticulatum, Acropora, Western Indian Ocean
URN:NBN:urn:nbn:se:slu:epsilon-p-113376
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113376
Additional ID:
Type of IDID
DOI10.1016/j.jembe.2021.151606
Web of Science (WoS)000687854700009
ID Code:25272
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:08 Sep 2021 07:25
Metadata Last Modified:08 Sep 2021 07:31

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