WorldCat Identities

McAllen, Rob

Overview
Works: 12 works in 21 publications in 1 language and 92 library holdings
Genres: Conference papers and proceedings  Biographies  Bibliographies 
Roles: Editor, htt, Contributor, Other, Thesis advisor
Classifications: QH541.5.S3, 577.7
Publication Timeline
.
Most widely held works by Rob McAllen
Challenges to marine ecosystems : proceedings of the 41st European Marine Biology Symposium by K Martens( )

10 editions published between 2008 and 2009 in English and held by 40 WorldCat member libraries worldwide

Addressing threats to marine ecosystems, this volume contains contributions to the 41st European Marine Biology Symposium. Coverage includes marine protected areas, global climate change and marine ecosystems, sustainable fisheries and agriculture
Chapter 1 The Biology of Austrominius Modestus (Darwin) in its Native and Invasive Range by Ruth M O'Riordan( )

1 edition published in 2020 in English and held by 34 WorldCat member libraries worldwide

Austrominius modestus, formerly Elminius modestus, is a relatively small species of four-plated acorn barnacle, which is native to the subtropical and temperate zones of Australasia. It was introduced into Europe in the 1940s, where its current range includes England, Scotland, Wales, Ireland and continental Europe from Denmark to southern Portugal, as well as two reported locations in the Mediterranean Sea. This species occurs intertidally and subtidally on a very wide range of substrata in both its native and introduced range and is found on sheltered to intermediate exposed shores, but is absent from wave-exposed shores, probably due to the relative fragility of its shell. A. modestus is known to be both euryhaline and eurythermal, but its physiology (and that of other cirripedes) has been relatively little studied in comparison with other invertebrate species. Cold temperatures and competition from arctic-boreal barnacle species currently control its northern limit. At the southern limit, desiccation stress, or some other stress(es), may be limiting the abundance of Austrominius modestus by affecting cyprids and/or metamorphs at the settlement and recruitment stages. Abundance may also be limited by factors occurring at the reproductive stage. Since Austrominius modestus is an obligatory cross-fertiliser, the need for a critical breeding density is one of the factors that appears to have slowed the speed of its spread in Europe. Although this species can commence reproducing at a very young age and under optimal conditions produces multiple broods per year, its fecundity has not yet been studied. An examination of the age of first brooding, the timing and size and number of broods per year at sites at the northern (Scotland) and southern (Portugal) limits of the current invasive range of Austrominius modestus may provide a better understanding of the factors controlling its geographic distribution, abundance and speed of spread in its non-native range. For instance, warming waters could result in increased reproduction and recruitment of Austrominius modestus, leading to a reduced density of the native Semibalanus balanoides Linnaeus which may drive Semibalanus balanoides to extinction in certain parts of its range. Further research is necessary to determine the functional role of Austrominius modestus in relation to native species in order to understand the implications that changes in abundance and distribution of A. modestus may have for ecosystems
Room for one more? Coexistence of native and non-indigenous barnacle species by M. C Gallagher( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Gelatinous zooplankton in Irish waters: ecology and role in the gill disorders of marine-farmed salmon : thesis for the degree of Doctor of philosophy by Emily Baxter( Book )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

Shallow subtidal octocorals in an Irish marine reserve by Cynthia D Trowbridge( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Marine aloricate ciliate red tides in a temperate Irish sea lough by C. D Trowbridge( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Biology of the invasive ascidian Ascidiella aspersa in its native habitat: Reproductive patterns and parasite load( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Abstract: The European sea squirt Ascidiella aspersa is a solitary tunicate native to the northeastern Atlantic, commonly found in shallow and sheltered marine ecosystems where it is capable of forming large clumps and outcompeting other invertebrate fauna at settlement. To date, there have been relatively few studies looking at the reproductive biology and health status of this invasive species. Between 2006 and 2010 sampling of a native population took place to investigate gametogenesis and reproductive cycle and to determine the impact of settlement depth on reproduction. In addition, parasite diversity and impact was assessed. A staging system to assess reproductive development was determined. The study highlighted that from year to year the tunicate could change its reproductive strategy from single sex to hermaphrodite, with spawning possible throughout the year. Depth did not impact on sex determination, however, gonad maturation and spawning occurred earlier in individuals in deeper waters compared to shallow depth and it also occurred later in A.aspersa at sites further away from the open sea. Four significant parasite groups including eugregarines, ciliates, trematodes and turbellarians were detected and prevalence of parasite infections increased in A.aspersa at sites with a reduced water flow rate. This study demonstrates the high biotic potential of this ascidian bioinvader to have a negative impact on native fauna in an introduced ecosystem, due to its highly efficient reproductive and resource allocation strategies. Artificial structures such as mooring lines can harbour large aggregations of A.aspersa, however, these manmade habitats may facilitate the colonisation and establishment of this invasive species in the benthos. Additionally, the parasite communities that A.aspersa harbour may also exacerbate its negative impact, both ecologically and economically, in an introduced area by possibly leading to the emergence of new disease in native species i.e. pathogen spillover
Biodiversity of shallow subtidal, under-rock invertebrates in Europe's first marine reserve: Effects of physical factors and scientific sampling( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Abstract: At Lough Hyne Marine Reserve in SW Ireland, shallow subtidal, under-rock biodiversity was investigated to assess (i) any deleterious effects of scientific sampling and (ii) quantitative baseline community patterns. Comparisons were made between 10 sites with annual rock-turning disturbance and 10 with multi-decadal (historical) disturbance. At each site, shallow subtidal rocks (N=1289 total) were lifted, organisms recorded, and rocks replaced in their original position. Biodiversity indices were calculated to evaluate how diversity varied with location within the lough, frequency of sampling disturbance, degree of hypoxia/anoxia, dissolved oxygen (DO) concentration, and number of rocks turned. The richness of solitary invertebrates surveyed in situ averaged 21 taxa per site with significantly more in the South Basin (near the lough's connection to the ocean) than in the North Basin. The Shannon-Wiener Index did not differ significantly with variables investigated. However, evenness was higher at annually disturbed sites than at historical ones where anemones with algal symbionts often dominated. Several sites were hypoxic to anoxic under the shallow subtidal rocks. Cup corals were most abundant in the South Basin; DO was a crucial explanatory variable of these sensitive species. Solitary ascidians were most abundant at South-Basin annual sites with DO levels being a highly significant explanatory variable. Graphical abstract: Highlights: Scientific sampling did not affect invertebrate S or H′ at Irish marine reserve. In nMDS analyses, North and South Basin sites generally clustered separately. Low-oxygen conditions frequently occurred, damaging under-rock communities. Dissolved oxygen was a crucial factor for cup corals and other species
Challenges to marine ecosystems by J Davenport( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

The world's marine ecosystems face multiple challenges, some natural, but many resulting from humankind's activities. The subthemes of the 41st European Marine Biology Symposium held in September 2005 in Cork, Ireland address all of these matters. This title presents a representative sample of contributions to this symposium
Short-term losses and long-term gains: The non-native species Austrominius modestus in Lough Hyne Marine Nature Reserve( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Abstract: The non-native barnacle species Austrominius modestus was first recorded in Ireland, close to Lough Hyne marine nature reserve in 1957. This species was not recorded inside the Lough until 1980, but by 2001 was the dominant intertidal barnacle within the reserve. It has been suggested that increases in the abundance of this species at other locations in Europe may be linked to increasing sea surface temperatures, and that A.modestus is an "ecological sleeper". Despite an overall trend for increasing sea surface temperatures, this long term warming is punctuated by extreme events such as severely cold winters. A.modestus is warm water adapted, and has been recorded to decrease in abundance following cold winters. The winters of 2009/2010 and 2010/2011 were amongst the coldest recorded in Ireland in past decades. In the present study, higher levels of mortality were recorded for A.modestus than native barnacle species in Lough Hyne following these cold winters. Additionally, this species was recorded at lower abundances at the majority of sites surveyed in Lough Hyne in 2011 compared with 2009. Despite this, A.modestus remains the dominant barnacle species in the Lough and monitoring the recruitment of intertidal barnacles within Lough Hyne during 2014-2015 revealed that A.modestus was the most abundant recruit at study sites, both in removal plots and in the pre-existing community. The year-round breeding of A.modestus in addition to the closed nature of the Lough promotes A.modestus within the reserve. Despite this, native barnacle species continue to persist in Lough Hyne, though generally at low abundances, with the exception of exposed locations such as the Rapids and Bullock Island where natives outnumber A.modestus . The future intertidal barnacle community within the Lough is likely to be dominated by A.modestus with Chthamalus montagui and C.stellatus being abundant at sites which are not suitable for A.modestus . While the consequences of this are unknown, it is possible that the presence of A.modestus may alter trophic interactions and energy flow within the reserve
The biology of "Austrominius Modestus" (Darwin) in its native and invasive range by Ruth M O'Riordan( )

1 edition published in 2021 in English and held by 0 WorldCat member libraries worldwide

 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  General Special  
Audience level: 0.00 (from 0.00 for Challenges ... to 0.00 for Challenges ...)

Chapter 1 The Biology of Austrominius Modestus (Darwin) in its Native and Invasive Range
Covers
Chapter 1 The Biology of Austrominius Modestus (Darwin) in its Native and Invasive Range
Alternative Names
McAllen, R.

Languages
English (21)