268 research outputs found
Confirmation of the identification and establishment of the South American slipper limpet Crepipatella dilatata (Lamark 1822) (Caenogastropoda: Calyptraeidae) in Northern Spain
The broadcast spawning Caribbean shipworm, <i>Teredothyra dominicensis</i> (Bivalvia, Teredinidae), has invaded and become established in the eastern Mediterranean Sea
Biogeography of Wood-Boring Crustaceans (Isopoda: Limnoriidae) Established in European Coastal Waters
Marine wood-borers of the Limnoriidae cause great destruction to wooden structures exposed in the marine environment. In this study we collated occurrence data obtained from field surveys, spanning over a period of 10 years, and from an extensive literature review. We aimed to determine which wood-boring limnoriid species are established in European coastal waters; to map their past and recent distribution in Europe in order to infer species range extension or contraction; to determine species environmental requirements using climatic envelopes. Of the six species of wood-boring Limnoria previously reported occurring in Europe, only Limnoria lignorum, L. quadripunctata and L. tripunctata are established in European coastal waters. L. carinata and L. tuberculata have uncertain established status, whereas L. borealis is not established in European waters. The species with the widest distribution in Europe is Limnoria lignorum, which is also the most tolerant species to a range of salinities. L. quadripunctata and L. tripunctata appear to be stenohaline. However, the present study shows that both L. quadripunctata and L. tripunctata are more widespread in Europe than previous reports suggested. Both species have been found occurring in Europe since they were described, and their increased distribution is probably the results of a range expansion. On the other hand L. lignorum appears to be retreating poleward with ocean warming. In certain areas (e.g. southern England, and southern Portugal), limnoriids appear to be very abundant and their activity is rivalling that of teredinids. Therefore, it is important to monitor the distribution and destructive activity of these organisms in Europe
<i>Rhizophora stylosa </i>prop roots even when damaged prevent wood-boring teredinids from toppling the trees
Variation of commercial timbers from Turkey in resistance to marine borers as assessed by marine trial and laboratory screening
Nanoparticles of alkylglyceryl dextran and poly(ethyl cyanoacrylate) for applications in drug delivery: preparation and characterisation
Diversity, environmental requirements, and biogeography of bivalve wood-borers (Teredinidae) in European coastal waters
Background: Bivalve teredinids inflict great destruction to wooden maritime structures. Yet no comprehensive
study was ever carried out on these organisms in European coastal waters. Thus, the aims of this study were to:
investigate the diversity of teredinids in European coastal waters; map their past and recent distributions to detect
range expansion or contraction; determine salinity-temperature (S-T) requirements of species; flag, for future
monitoring, the species that pose the greatest hazard for wooden structures.
Results: A total of nine teredinid species were found established in European coastal waters. Seven were
considered cryptogenic, of unknown origin, and two were considered alien species. Teredo navalis and Nototeredo
norvagica were the species with the widest distribution in European waters. Recently, T. navalis has been reported
occurring further east in the Baltic Sea but it was not found at a number of sites on the Atlantic coast of southern
Europe. The Atlantic lineage of Lyrodus pedicellatus was the dominant teredinid in the southern Atlantic coast of
Europe. In the Mediterranean six teredinid species occurred in sympatry, whereas only three of these occurred in
the Black Sea. The species that pose the greatest hazard to wooden maritime structures in European coastal areas
are T. navalis and the two lineages of L. pedicellatus.
Conclusions: Combined data from field surveys and from the literature made it possible to determine the diversity
of established teredinid species and their past and recent distribution in Europe. The environmental requirements
of species, determined using climatic envelopes, produced valuable information that assisted on the explanation of
species distribution. In addition, the observed trends of species range extension or contraction in Teredo navalis and
in the two lineages of Lyrodus pedicellatus seem to emphasise the importance of temperature and salinity as
determinants of the distribution of teredinids, whereas their life history strategy seems to play an important role on
competition.
Teredo navalis and pedicellatus-like Lyrodus species should be monitored due to their destructive capability. The two
alien species may expand further their distribution range in Europe, becoming invasive, and should also be
monitored.This research was partially funded by Fundação para a Ciência e a Tecnologia, Portugal through a personal grant to LB (SFRH/BD/17915/2004)
Mosquitofish avoid thermal stress by moving from open water to the shade of the mangrove Rhizophora mangle
Introduction, dispersal and naturalisation of the Manila clam Ruditapes philippinarum in British estuaries, 1980-2010
The introduction of the Manila clam into British coastal waters in the 1980s was contested by conservation agencies. While recognizing the value of the clam for aquaculture, the government decided that it posed no invasive risk, as British sea temperatures would prevent naturalization. This proved incorrect. Here we establish the pattern of introduction and spread of the species over the first 30 years of its presence in Britain. We report archival research on the sequence of licensed introductions and examine their relationship in time and space to the appearance of wild populations as revealed in the literature and by field surveys. By 2010 the species had naturalized in at least 11 estuaries in southern England. These included estuaries with no history of licensed introduction. In these cases activities such as storage of catch before market or deliberate unlicensed introduction represent the probable mechanisms of dispersal. In any event naturalization is not an inevitable consequence of introduction and the chances of establishment over the period in question were finely balanced. Consequently in Britain the species is not currently aggressively invasive and appears not to present significant risk to indigenous diversity or ecosystem function. However it is likely to gradually continue its spread should sea surface temperatures rise as predicted
Maser action in methanol transitions
We report the detection with the ATCA of 6.7 GHz methanol emission towards
OMC-1. The source has a size between 40'' and 90'', is located to the
south-east of Ori-KL and may coincide in position with the 25 GHz masers. The
source may be an example of an interesting case recently predicted in theory
where the transitions of traditionally different methanol maser classes show
maser activity simultaneously. In addition, results of recent search for
methanol masers from the 25 and 104.3 GHz transitions are reported.Comment: To appear in the Proceedings of the 2004 European Workshop: "Dense
Molecular Gas around Protostars and in Galactic Nuclei", Eds. Y.Hagiwara,
W.A.Baan, H.J. van Langevelde, 2004, a special issue of ApSS, Kluwer; author
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