Home About Browse Search
Svenska


Different environmental variables predict distribution and cover of the introduced red seaweed Eucheuma denticulatum in two geographical locations

Eggertsen, M. and Tano, S. A. and Chacin, D. H. and Eklof, J. S. and Larsson, J. and Berkström, Charlotte and Buriyo, A. S. and Halling, C. (2021). Different environmental variables predict distribution and cover of the introduced red seaweed Eucheuma denticulatum in two geographical locations. Biological Invasions. 23 , 1049-1067
[Research article]

[img] PDF
1MB

Abstract

In this study we examined abiotic and biotic factors that could potentially influence the presence of a non-indigenous seaweed, Eucheuma denticulatum, in two locations, one outside (Kane'ohe Bay, Hawai'i, USA) and one within (Mafia Island, Tanzania) its natural geographical range. We hypothesized that the availability of hard substrate and the amount of wave exposure would explain distribution patterns, and that higher abundance of herbivorous fishes in Tanzania would exert stronger top-down control than in Hawai'i. To address these hypotheses, we surveyed E. denticulatum in sites subjected to different environmental conditions and used generalized linear mixed models (GLMM) to identify predictors of E. denticulatum presence. We also estimated grazing intensity on E. denticulatum by surveying the type and the amount of grazing scars. Finally, we used molecular tools to distinguish between indigenous and non-indigenous strains of E. denticulatum on Mafia Island. In Kane'ohe Bay, the likelihood of finding E. denticulatum increased with wave exposure, whereas on Mafia Island, the likelihood increased with cover of coral rubble, and decreased with distance from areas of introduction (AOI), but this decrease was less pronounced in the presence of coral rubble. Grazing intensity was higher in Kane'ohe Bay than on Mafia Island. However, we still suggest that efforts to reduce non-indigenous E. denticulatum should include protection of important herbivores in both sites because of the high levels of grazing close to AOI. Moreover, we recommend that areas with hard substrate and high structural complexity should be avoided when farming non-indigenous strains of E. denticulatum.

Authors/Creators:Eggertsen, M. and Tano, S. A. and Chacin, D. H. and Eklof, J. S. and Larsson, J. and Berkström, Charlotte and Buriyo, A. S. and Halling, C.
Title:Different environmental variables predict distribution and cover of the introduced red seaweed Eucheuma denticulatum in two geographical locations
Series Name/Journal:Biological Invasions
Year of publishing :2021
Volume:23
Page range:1049-1067
Number of Pages:19
ISSN:1387-3547
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 seaweeds, Herbivory, Invasive species, Phase shift, Macroalgae, Environmental factors
URN:NBN:urn:nbn:se:slu:epsilon-p-109035
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109035
Additional ID:
Type of IDID
DOI10.1007/s10530-020-02417-z
Web of Science (WoS)000591553700001
ID Code:22905
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:06 Apr 2021 16:03
Metadata Last Modified:06 Apr 2021 16:11

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits