The current distribution and abundance
of the Australasian barnacle <i>Elminius modestus</i> in Portugal

O’Riordan, Ruth M.; Ramsay, Neil F.

doi:10.1017/s0025315498001118

Cited by 19 publications

(8 citation statements)

References 8 publications

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“…The increase of Elminius modestus around the Irish coastline has been well documented since it was introduced with shipping in 1955 (Crisp, 1958;O'Riordan, 1996). Elminius modestus is known to have a number of competitive advantages over native barnacle species including a year round breeding season and a tolerance to varied salinities (Lawson et al, 2004).…”

Section: Species'changes After 45 Yearsmentioning

confidence: 99%

Using historical data to detect temporal changes in the abundances of intertidal species on Irish shores

et al. 2005

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An historical data set, collected in 1958 by Southward and Crisp, was used as a baseline for detecting change in the abundances of species in the rocky intertidal of Ireland. In 2003, the abundances of each of 27 species was assessed using the same methodologies (ACFOR [which stands for the categories: abundant, common, frequent, occasional and rare] abundance scales) at 63 shores examined in the historical study.Comparison of the ACFOR data over a 45-year period, between the historical survey and re-survey, showed statistically signi¢cant changes in the abundances of 12 of the 27 species examined. Two species (one classed as northern and one introduced) increased signi¢cantly in abundance while ten species (¢ve classed as northern, one classed as southern and four broadly distributed) decreased in abundance. The possible reasons for the changes in species abundances were assessed not only in the context of anthropogenic e¡ects, such as climate change and commercial exploitation, but also of operator error. The error or di¡erences recorded among operators (i.e. research scientists) when assessing species abundance using ACFOR categories was quanti¢ed on four shores. Signi¢cant change detected in three of the 12 species fell within the margin of operator error. This e¡ect of operator may have also contributed to the results of no change in the other 15 species between the two census periods. It was not possible to determine the e¡ect of operator on our results, which can increase the occurrence of a false positive (Type 1) or of a false negative (Type 2) outcome.

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Section: Species'changes After 45 Yearsmentioning

confidence: 99%

Using historical data to detect temporal changes in the abundances of intertidal species on Irish shores

et al. 2005

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“…Elminius modestus is an invasive species from New Zealand which was first introduced into the UK in 1945 (Bishop 1947). Its European distribution is now quite similar to that of C. montagui, extending from Faro (Portugal) up to the south of Denmark (Harms and Anger 1989;O'Riordan and Ramsay 1999). Elminius modestus spread to the northern French coast by 1950 and was present in Roscoff by 1952 (Bishop 1954).…”

Section: Introductionmentioning

confidence: 99%

Secondary production, calcification and CO2 fluxes in the cirripedes Chthamalus montagui and Elminius modestus

2007

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Calcification, a process common to numerous marine taxa, has traditionally been considered to be a significant source of CO(2) in tropical waters only. A number of relatively recent studies, however, have shown that significant amounts of CO(2) are also produced in temperate waters, although none of these studies was carried out on rocky shores, which are considered to be very productive systems. We compared the CO(2) fluxes due to respiration and calcification in two temperate species, the cirripedes Chthamalus montagui and Elminius modestus. The population dynamics of both species were estimated at two sites during a 1-year experimental period in order to establish mean organic (ash-free dry weight) and CaCO(3) (dry shell weight) production. Based on these parameters, we estimated the CO(2) fluxes due to respiration and calcification. CaCO(3) production was estimated to be 481.0 and 1,803.9 g(CaCO3) m(-2) year(-1) at each site, representing 3.4 and 12.7 mol(CO2) m(-2) year(-1) respectively, of released CO(2). These fluxes represent each 47% of the CO(2) released as a result of respiration and calcification. The production of CaCO(3) at the high-density site was: (1) among the highest values obtained for temperate organisms, and (2) comparable to the estimated CO(2) fluxes for coral reefs. As calcifying organisms are well represented in temperate ecosystems in terms of both density and biomass, our results provide clear evidence that calcification of temperate organisms should not be underestimated. Additional studies on other rocky shore taxa are needed before the relative importance of calcification in rocky intertidal carbon budgets can be generalized.

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“…This illustrates, that despite the ability of the invasive A. modestus to utilise free space through the year, when natives are unable to do so, it is still possible for native species to recruit at high densities seasonally allowing them to persist. It is likely that artificial structures will be initially dominated by the invasive species (Bracewell et al 2012(Bracewell et al , 2013, given the short window of opportunity for native species to colonise the new structure, and the extended breeding period of the invasive species (Crisp and Davies 1955;O'Riordan and Murphy 2000). However, it is still possible for the native species to become established on such structures.…”

Section: Discussionmentioning

confidence: 99%

“…This invasive species breeds via a continuous succession of broods (Moore 1944;Moyse 1960;Patel and Crisp 1960;Moyse and Nelson-Smith 1963), potentially breeding throughout the entire year (Bennell 1981;O'Riordan and Murphy 2000). This extended breeding period allows A. modestus to colonise any free space available during this time, thus limiting the space available for spat of the single brood of the native arctic-boreal species, Semibalanus balanoides, to settle in the spring time (Rainbow 1984;Hui and Moyse 1987).…”

Section: Introductionmentioning

confidence: 99%

Room for one more? Coexistence of native and non-indigenous barnacle species

et al. 2016

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Space can be a limiting factor in intertidal communities and competition for this resource plays a role in determining community composition. Invasive species are known to be opportunistic, and are capable of rapidly colonising free space. Since its introduction to Europe, over 70 years ago, the invasive barnacle species, Austrominius (=Elminius) modestus has become widespread on European coasts and is now the dominant barnacle species at numerous locations. However, little is known about its competitive interactions with native barnacle species. During this study, 18 removal plots (25 cm 2 ) were created at each of six sites in south-west Ireland, encompassing a range of exposure levels and including both artificial structures and natural rocky shores. Monthly monitoring of these plots over 19 months revealed that, despite high recruitment of native species seasonally, A. modestus ultimately outnumbered natives in removal plots at four sites. With the provision of free space, the invasive species increased its relative abundance at three sites, but did not entirely displace natives at any site. Continued recruitment of the native species at high abundances on a seasonal basis in addition to the invasive species not entirely colonising all available space, ensure native species can persist and co-exist with A. modestus at the majority of sites at this location.

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The current distribution and abundance of the Australasian barnacle Elminius modestus in Portugal

Cited by 19 publications

References 8 publications

Using historical data to detect temporal changes in the abundances of intertidal species on Irish shores

Using historical data to detect temporal changes in the abundances of intertidal species on Irish shores

Secondary production, calcification and CO2 fluxes in the cirripedes Chthamalus montagui and Elminius modestus

Room for one more? Coexistence of native and non-indigenous barnacle species

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