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|Title: ||On the relevance of freshwater nematodes for ecological assessment in transitional waters|
|Authors: ||Alves, Ana|
|Keywords: ||Freshwater nematodes|
|Issue Date: ||4-Sep-2011|
|Publisher: ||XLIII ONTA, Annual Meeting Book ,|
|Citation: ||XLIII ONTA, Annual Meeting Book ,ONTA, Organization of Nematologists of Tropical America, Abstract Book, 4-8 September, Coimbra, Portugal, p 104.|
|Abstract: ||Nematoda is the most common group of organisms in the meiobenthic
assemblages of freshwater and marine systems and, in Portugal, its distribution
has been studied along the estuarine gradient of two estuaries. Nematodes are
recognized as good indicators of anthropogenic impacts in aquatic ecosystems
and, together with the taxonomic data, the inclusion of functional diversity can
create a powerful tool, providing information on the functioning of ecosystems.
Most estuarine studies do not encompass information to genus/species
level of freshwater nematodes or reduce the information to family level,
impoverishing thus information on diversity. The main aim of this study is to
evaluate the information loss effect on the assessment of the ecological quality
status of the upstream area of the Mondego estuary, caused by the non
identification of freshwater nematodes– both taxonomic and functional
approaches of nematode estuarine communities.
Results show that nematodes assemblages reflected the salinity gradient,
with increasing densities and diversity from oligohaline to euhaline areas.
Freshwater nematodes contributed with a small percentage (3.5% of total
density), but were very abundant in the upstream areas (0.5 – 47.4%). Without
freshwater nematodes, the separation of salinity stretches was maintained (with
lower distinction of the stretches) and the performance of the Index of Trophic
Diversity and the Maturity Index revealed a worse condition of the ecological
status of oligohaline and mesohaline stretches.
This study shows that taxonomic and biologic characteristics of freshwater
nematodes should be evaluated when assessing the ecological status of an
estuary in order to correctly classify the uppermost sections of estuaries.
Keywords: estuarine gradient, Mondego estuary, Portugal, subtidal
|Appears in Collections:||BIO - Comunicações - Em Congressos Científicos Internacionais|
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