title: Predicting free-space occupancy on novel artificial structures by an invasive intertidal barnacle using a removal experiment.
abstract: Artificial structures can create novel habitat in the marine environment that has been associated with the spread of invasive species. They are often located in areas of high disturbance and can vary significantly in the area of free space provided for settlement of marine organisms. Whilst correlation between the amount of free space available and recruitment success has been shown in populations of several marine benthic organisms, there has been relatively little focus on invasive species, a group with the potential to reproduce in vast numbers and colonise habitats rapidly. Invasion success following different scales of disturbance was examined in the invasive acorn barnacle, Austrominiusmodestus, on a unique art installation located in Liverpool Bay. Population growth and recruitment success were examined by comparing recruitment rates within disturbance clearings of 4 different sizes and by contrasting population development with early recruitment rates over a 10 week period. Disturbed areas were rapidly recolonised and monocultures of A. modestus formed within 6 weeks. The size of patch created during disturbance had no effect on the rate of recruitment, while a linear relationship between recruit density and patch size was observed. Density-dependent processes mediated initial high recruitment resulting in population stability after 8-10 weeks, but densities continued to greatly exceed those reported in natural habitats. Given that artificial structures are likely to continue to proliferate in light of climate change projections, free-space is likely to become more available more frequently in the future supporting the expansion of fast-colonising species.
authors.affiliation: School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom.
authors.forename: Sally A
authors.initials: SA
authors.lastname: Bracewell
authors.forename: Leonie A
authors.initials: LA
authors.lastname: Robinson
authors.forename: Louise B
authors.initials: LB
authors.lastname: Firth
authors.forename: Antony M
authors.initials: AM
authors.lastname: Knights
mesh_terms: D000818:Animals; D057231:Climate Change; D017753:Ecosystem; D058865:Introduced Species; D001468:Thoracica / Q000254:growth & development*; D013997:Time Factors
references.citation: Oecologia. 2013 Sep;173(1):259-68
references.pmid: 23386046
references.citation: Ecol Lett. 2011 Jan;14(1):52-7
references.pmid: 21070561
references.citation: Biol Bull. 2009 Jun;216(3):373-85
references.pmid: 19556601
references.citation: Trends Ecol Evol. 2005 May;20(5):223-8
references.pmid: 16701373
references.citation: Nature. 2001 Aug 2;412(6846):538-43
references.pmid: 11484053
references.citation: PLoS One. 2012;7(11):e48863
references.pmid: 23145000
references.citation: J Anim Ecol. 2011 May;80(3):681-7
references.pmid: 21250991
references.citation: Oecologia. 2003 Dec;137(4):617-20
references.pmid: 14534781
references.citation: Science. 1994 Feb 18;263(5149):935-9
references.pmid: 17758633
references.citation: Biol Rev Camb Philos Soc. 1950 Jan;25(1):1-45
references.pmid: 24537188
references.citation: Proc Natl Acad Sci U S A. 1985 Jun;82(11):3707-11
references.pmid: 16593571
references.citation: PLoS One. 2012;7(4):e35096
references.pmid: 22493734
references.citation: Science. 1999 Nov 19;286(5444):1577-1579
references.pmid: 10567267
references.citation: J Anim Ecol. 2008 May;77(3):573-84
references.pmid: 18284479
references.citation: Ecology. 2010 Oct;91(10):2931-40
references.pmid: 21058553