Effects of habitat-modifying invasive macroalgae on epiphytic algal communities

Abstract

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 400:87-100 (2010) - DOI: https://doi.org/10.3354/meps08391 Effects of habitat-modifying invasive macroalgae on epiphytic algal communities Emily Jones1,2,*, Carol S. Thornber1 1Department of Biological Sciences, University of Rhode Island, Kingston, Rhode Island 02881, USA 2Bodega Marine Laboratory, University of California Davis, Bodega Bay, California 94923, USA *Email: emjones@ucdavis.edu ABSTRACT: Although invasive species can negatively impact communities via processes such as resource competition, they may also add new resources that facilitate the distribution and/or abundance of other organisms. In rocky intertidal systems, many benthic macroalgae compete for primary substrate, while providing secondary substrata to which sessile organisms can attach. Using field surveys and laboratory experiments, we investigated algal host–epiphyte dynamics in a New England rocky intertidal system. First, we compared the composition, abundance, richness, and diversity of epiphytes on 2 invasive macroalgal species, Codium fragile ssp. tomentosoides and Grateloupia turuturu, to 2 native macroalgal species, Chondrus crispus and Fucus vesiculosus. We found significant differences among epiphyte communities, as all macroalgal hosts supported different assemblages of species. While epiphyte richness and diversity were generally low on F. vesiculosus and G. turuturu year-round, they were low on C. crispus during the winter only. In contrast, epiphyte richness and diversity on C. fragile remained high throughout the year, suggesting that C. fragile plays an important role for supporting epiphytes during the cooler months. Second, we examined the relationship between epiphytes and a common herbivorous snail, Lacuna vincta. The abundance of juvenile L. vincta was positively correlated with 1 of the 2 most common epiphyte species, Neosiphonia harveyi. However, L. vincta showed a significant consumption preference for the other abundant epiphyte, Ceramium virgatum, in laboratory assays. Our results suggest that epiphyte facilitation by these invasive algal hosts is not only seasonally important for maintaining species richness and diversity, but may also provide both food and habitat for higher trophic levels. KEY WORDS: Invasive macroalgae · Epiphyte · Habitat-modification · Codium fragile · Grateloupia turuturu · Lacuna vincta Full text in pdf format PreviousNextCite this article as: Jones E, Thornber CS (2010) Effects of habitat-modifying invasive macroalgae on epiphytic algal communities. Mar Ecol Prog Ser 400:87-100. https://doi.org/10.3354/meps08391 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 400. Online publication date: February 11, 2010 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2010 Inter-Research.