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Special Issue:
Multiple Stressors in Freshwater Ecosystems |
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Special Issue:
Environmental Flows: Science and Management |
Volume 55 Issue
1 - January 2010
Guest Editors: A.H. Arthington, R.J. Naiman, M.E. McClain and C.
Nilsson
Environmental flows - the flow regimes left in rivers, or
restored to developed rivers - are a central tool helping
resource managers to protect the biodiversity, resilience and
ecological goods and services provided by healthy riverine
ecosystems. Yet for many thousands of streams and rivers we
cannot answer the question - how much water does a river need,
when and how often? This Special Issue reports new findings and
provides novel insights in the science and management of
environmental flows, including: synoptic reviews, methodological
innovations, flow restoration experiments, modelling techniques
and broader principles to support sustainable use of basin-wide
freshwater resources. Based on contributions to this Special
Issue, the action agenda of the 2007 Brisbane Declaration on
environmental flows and the wider literature, the Editors
propose an invigorated global research programme to construct
and calibrate hydro-ecological models that quantify
environmental flows and thereby protect the ecological goods and
services provided by healthy rivers in various hydro-climatic
settings across the globe. |
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Special Issues Section:
European High Mountain Lakes: Regionalisation and Ecological
Status |
Volume 54 Issue
12 - December 2009
Global change issues increasingly require ecological
assessments and predictions to be made at large spatial scales,
even though it often is not feasible to investigate all
ecosystems of interest in such large regions. In this Special
Issue, an international team of 49 scientists describes the
physical, chemical and biological characteristics of ca. 350
remote high-mountain lakes from 12 different regions across
Europe. The aim of this broad-scale survey was to evaluate the
true range of diversity and environmental variability that
exists in these sensitive ecosystems. The papers in this Special
Issue investigate climate, nutrient and major ion chemistry,
organic pollutants, trace metals and the contemporary and
subfossil biota of the lakes and their catchments. The studies
in this Special Issue show that there is a strong regional
element to patterns of
co-variation in environmental factors,
including climate and pollution, and to the biological responses
to this environmental variation. From a management perspective,
it is clear that lake classification, the development of useful
typologies and assessments of reference conditions should be
undertaken at regional rather than pan-European scales. Climate
warming already affects most of the lake districts and there are
considerable uncertainties as to how this will modify conditions
in remote European mountain systems. The papers in this Special
Issue indicate that the lake district concept is more than a
mere geographical construct and merits further theoretical and
experimental development as an ecological concept. This Special
Issue will interest limnologists, lake managers, biogeographers
and paleoecologists. |
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Special Issues Section:
Structure-Function Relationships in Running Waters: From Theory to Application |
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Special Issues Section:
Assessing and Conserving Groundwater Biodiversity |
Volume 54 Issue
4 - April 2009
Guest Editors: Janine Gibert and David C.Culver
Groundwater biodiversity is vastly underestimated and
underappreciated. Clearly, however, aquatic subterranean
habitats are varied and harbour unique biological communities of
remarkable diversity, with organisms ranging widely in taxonomic
affiliation and body size, from less than 1 μm in groundwater
microbes to vertebrates that reach more than 10 cm. Freshwater
Biology have recently published a special issue which
synthesises information on the first comprehensive, broad-scale
examination of aquatic subterranean diversity in both karstic
and non-karstic aquifers.
Data are mainly derived from a survey carried out across
multiple regions in Europe and a data base elaborated within the
European PASCALIS project (Protocol for the ASsessment and
Conservation of Aquatic Life In the
Subsurface), but information from
studies elsewhere in Europe, North America and Australia is also
included.
Three reviews are devoted to the biology and ecology of
groundwater bacteria and archaea, oligochaetes, and copepods -
all poorly investigated but important subterranean taxa. Five
papers address broad-scale diversity patterns across European
regions, spatial partitioning of species richness, cryptic
diversity, sampling methodology, and the use of surrogate
taxonomic groups for assessing total species richness of
groundwater communities. These analyses are complemented by four
papers exploring biodiversity patterns in selected regions and
by two papers addressing conservation issues. Three additional
papers expand on the central themes of adequate sampling and
dispersal, and a final synthesis summarizes the advances made in
elucidating groundwater biodiversity patterns and points to
important challenges that lie ahead. Collectively, the papers in
this special issue should provide a solid foundation on which to
build future investigations and effective strategies for
protecting the astonishing diversity hidden in subterranean
environments. |
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Special Issues Section:
Viruses in Freshwater Ecosystems |
Volume 53 Issue
6 - June 2008
Guest Editors: Mathias Middelboe, Stéphan Jacquet and Markus
Weinbauer
Viruses have become widely recognized as the most abundant
biological entities and important players in aquatic
environments, and this realization has profoundly changed our
conceptual understanding of the functioning and regulation of
aquatic ecosystems in the last two decades. However, most of
this research has focussed on marine viruses, especially in
pelagic environments.
Here we introduce a special issue of Freshwater Biology dealing
with viruses in freshwater ecosystems. It represents the first
attempt to summarize progress in freshwater viral ecology made
by diverse research groups and to direct attention of viral
ecologists towards fresh waters.
Six review-type articles and ten original research papers cover
a wide range of aspects of freshwater viral ecology. This
includes reports on the distribution of freshwater viral
communities in contrasting habitats (e.g. sediments, wetlands,
littoral zone, open waters), on different roles of viruses in
freshwater ecosystems (e.g. mortality rates of bacteria and
phytoplankton, transduction, influence on bacterial diversity
and organic matter), and on different types of viruses (bacteriophages,
cyanophages, algal viruses, and a fish-pathogenic virus).
Collectively the series of papers presented in this special
issue indicates that freshwater environments cover great habitat
diversity and that the significance of some of the mechanisms
controlling viral dynamics and impacts may differ between
freshwater and marine habitats. |
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