56 research outputs found
Conservation status of a recently described endemic land snail, Candidula coudensis, from the Iberian Peninsula
Research ArticleWe assessed the distribution, population size and conservation status of Candidula coudensis,
a recently described endemic land snail from Portugal. From March 2013 to April
2014, surveys were carried out in the region where the species was described. We found an
extent of occurrence larger than originally described, but still quite small (13.5 km2). The
species was found mainly in olive groves, although it occurred in a variety of other habitats
with limestone soils, including grasslands, scrublands and stone walls. Minimum population
estimate ranged from 110,000–311,000 individuals. The main identified potential threats to
the species include wildfires, pesticides and quarrying. Following the application of IUCN
criteria, we advise a conservation status of either “Least Concern” or “Near-threatened”
under criterion D (restricted population)info:eu-repo/semantics/publishedVersio
Enveloping Sophisticated Tools into Process-Centered Environments
We present a tool integration strategy based on enveloping pre-existing tools without source code modifications or recompilation, and without assuming an extension language, application programming interface, or any other special capabilities on the part of the tool. This Black Box enveloping (or wrapping) idea has existed for a long time, but was previously restricted to relatively simple tools. We describe the design and implementation of, and experimentation with, a new Black Box enveloping facility intended for sophisticated tools --- with particular concern for the emerging class of groupware applications
Hubungan Antara Perhatian Orangtua Dan Hasil Belajar Pada Pembelajaran Tematik Integratif Siswa Kelas IV SD Negeri Kembangarum 2 Mranggen Demak
More less the studying result of students in 4th SD Negeri Kembangarum 2 Mranggen that influences some aspects, one of aspects is her parents?óÔé¼Ôäó not careless with them. Parents?óÔé¼Ôäó is constitute the?é?á first educator for children so that her parents?óÔé¼Ôäó has have responsibility to the studying result her children. The problem in this research contents is about Is there any correlation between of parents?óÔé¼Ôäó attention and the study result for thematic integrative learning in 4th SD Negeri Kembangarum 2 Mranggen Demak?. The hypothesis is that there is positive and significant correlation between of parents?óÔé¼Ôäó attention and the study result for thematic integrative learning in 4th SD Negeri Kembangarum 2 Mranggen Demak. The kind of this research is quantitative research. This research use correlation methode and submited the data use questionnaire and test. The colected data are analysed using product moment formula. The finding is that > on significancy level of 0,05. So the?é?á conclusion is there is positive and significant correlation between of parents?óÔé¼Ôäó attention and the study result for thematic integrative learning in 4th SD Negeri Kembangarum 2 Mranggen Demak
Impact of Dreissena fouling on the physiological condition of native and invasive bivalves : interspecific and temporal variations
The impact of Dreissena fouling on unionids
has hardly been studied in Europe, despite the fact
that in some ecosystems (e.g. Lake Balaton, Hungary)
infestations of several hundreds to a thousand individuals
per unionid have been observed. At present,
the zebra mussel Dreissena polymorpha is a dominant
species in Lake Balaton and in the last decade three
other invasive bivalves were introduced, potentially
increasing the pressure on native unionid survival. We
examined whether the fouling of dreissenids (zebra
and quagga (D. rostriformis bugensis) mussels) has a
negative impact on native (Anodonta anatina, Unio
pictorum and U. tumidus) and invasive (Corbicula
fluminea and Sinanodonta woodiana) bivalves and
whether there are any interspecific and temporal
variations in fouling intensity and physiological
condition measured by standard condition index and
glycogen content. A significant negative impact was detected on native unionids only in July and September
(no impact was detected in May), when the fouling
rate was high. For invasive species, a significant
negative impact was detected on S. woodiana with a
high level of dressenid infestation; whereas no significant
impact was detected on C. fluminea. Overall, this
study confirms that Dreissena may threaten unionid
species including the invasive S. woodiana, although
high interspecific and temporal variations were
observed. This situation should be taken into account
in future ecological and conservational assessments
because species respond differently to Dreissena
fouling and effects seem to be more pronounced in
late summer/early autumn. In addition, this study
provides the first evidence that the invasive C.
fluminea appear to be less vulnerable to dressenid
fouling.The study was supported by the Hungarian Scientific Fund (KTIA-OTKA) under the contract No. CNK80140
Biology and conservation of freshwater bivalves : past, present and future perspectives
Freshwater bivalves have been highly
threatened by human activities, and recently their
global decline has been causing conservational and
social concern. In this paper, we review the most
important research events in freshwater bivalve biology
calling attention to the main scientific achievements.
A great bias exists in the research effort, with
much more information available for bivalve species
belonging to the Unionida in comparison to other
groups. The same is true for the origin of these studies,
since the publishing pattern does not always correspond
to the hotspots of biodiversity but is concentrated in the northern hemisphere mainly in
North America, Europe and Russia, with regions such
as Africa and Southeast Asia being quite understudied.
We also summarize information about past, present
and future perspectives concerning the most important
research topics that include taxonomy, systematics,
anatomy, physiology, ecology and conservation of
freshwater bivalves. Finally, we introduce the articles
published in this Hydrobiologia special issue related
with the International Meeting on Biology and Conservation
of Freshwater Bivalves held in 2012 in
Braganc¸a, Portugal.We would like to express our gratitude to our sponsors and institutions, especially to the Polytechnic Institute of Braganca for all the logistic support. We acknowledge all keynote speakers, authors, session chairpersons and especially to all attendees whose contributions were fundamental for the success of this meeting. We would also like to thank all referees of this special issue and to Koen Martens, Editor-in-Chief of Hydrobiologia, for all the valuable comments and suggestions. The chronogram was built with the help of the expert opinion of fellow colleagues Rafael Araujo, Arthur Bogan, Kevin Cummings, Dan Graf, Wendell Haag, Karl-Otto Nagel and David Strayer to whom we are very grateful. The authors acknowledge the support provided by Portuguese Foundation for Science and Technology (FCT) and COMPETE funds-projects CONBI (Contract: PTDC/AAC-AMB/117688/2010) and ECO-IAS (Contract: PTDC/AAC-AMB/116685/2010), and by the European Regional Development Fund (ERDF) through the COMPETE, under the project "PEst-C/MAR/LA0015/2011"
Man and the Last Great Wilderness: Human Impact on the Deep Sea
The deep sea, the largest ecosystem on Earth and one of the least studied, harbours high biodiversity and provides a wealth of resources. Although humans have used the oceans for millennia, technological developments now allow exploitation of fisheries resources, hydrocarbons and minerals below 2000 m depth. The remoteness of the deep seafloor has promoted the disposal of residues and litter. Ocean acidification and climate change now bring a new dimension of global effects. Thus the challenges facing the deep sea are large and accelerating, providing a new imperative for the science community, industry and national and international organizations to work together to develop successful exploitation management and conservation of the deep-sea ecosystem. This paper provides scientific expert judgement and a semi-quantitative analysis of past, present and future impacts of human-related activities on global deep-sea habitats within three categories: disposal, exploitation and climate change. The analysis is the result of a Census of Marine Life – SYNDEEP workshop (September 2008). A detailed review of known impacts and their effects is provided. The analysis shows how, in recent decades, the most significant anthropogenic activities that affect the deep sea have evolved from mainly disposal (past) to exploitation (present). We predict that from now and into the future, increases in atmospheric CO2 and facets and consequences of climate change will have the most impact on deep-sea habitats and their fauna. Synergies between different anthropogenic pressures and associated effects are discussed, indicating that most synergies are related to increased atmospheric CO2 and climate change effects. We identify deep-sea ecosystems we believe are at higher risk from human impacts in the near future: benthic communities on sedimentary upper slopes, cold-water corals, canyon benthic communities and seamount pelagic and benthic communities. We finalise this review with a short discussion on protection and management methods
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