Introducció a l'estudi limnològic de la llacuna del Ter vell (Baix Empordà) = Introduction to the limnology of Ter Veil lagoon (Baix Emporda , Catalonia, Spain)
dc.contributor.author
dc.date.accessioned
2017-06-09T07:40:22Z
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2017-06-09T07:40:22Z
dc.date.issued
1989
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1133-6889
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dc.description.abstract
Ter Vell is a small (0.8 Ha) and shallow (usually less than 1 m deep) lagoon located
in one of the ancient Ter River mouths. A one year (biweekly samples) study was
carried out in 1984 to describe some limnological characteristics of the lagoon.
Conductivity varied between 1 and 39 mS/cm. It was 1-3 mS/cm higher in the
South basin (closer to the sea) than in the North one. Maximum values were observed
in autumn-winter and minimum ones in summer. Phosphorus concentrations were most of
the year over 4 u.g-at P-PO;-/I. The highest concentrations (50 ^Lg-at/I) were observed in
summer. Phosphorus concentrations from October to May were positively correlated to conductivity,
while those from May to September were not. Oxydized dissolved inorganic nitrogen
was very low all the year round (less than 4 pg-at/I).
Phytoplankton assemblages were between 104 and 4.105 cells per ml mostly because
Nannochloris sp., which was overwhelming during all the year. Accompanying species were
Monoraphidium sp. pl., Actinastrum hantzschii, Dictyiosphaerium pulchellurn, Cyclotella kutzingiana,
Lepocinclis ovum and Ochromonas sp. pl. during summer, and Dunaliella sp., Hemiselmis
rufescens, Pseudopedinella pyriformis, Katodinium rotundatum and Oxyrrhis marina
during winter. The amount of chlorophyll a per cell was always very low (between 0,1
and 2 pg per cell). During summer the most abundant zooplankters were Brachionus sp. pl.,
Moina micrura, and Acanthocyclops g. vernalis. During the cold months Notholca squamula,
Synchaeta sp., and Epiphanes brachionus were the most abundant. Maximum abundances
changed from 2,000 individuals/I in summer to 600 individuals/I in winter.
Ter Vell is an eutrophic lagoon with marked differences between chemical and biological
characteristics of different periods of the year. Two main periods can be distinguished
related to temperature. External factors, mainly freshwater and sea water inflows,
also control the differences observed
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application/pdf
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cat
dc.publisher
Institut d'Estudis Catalans. Institució Catalana d'Història Natural
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Reproducció digital del document publicat a: http://revistes.iec.cat/index.php/BICHN/article/view/8771/123583
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Butlletí de la Institució Catalana d'Història Natural, 1989, vol. 57, (Secció de Botànica, núm. 7), p. 23-34
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Articles publicats (D-CCAA)
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 Spain
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dc.subject
dc.title
Introducció a l'estudi limnològic de la llacuna del Ter vell (Baix Empordà) = Introduction to the limnology of Ter Veil lagoon (Baix Emporda , Catalonia, Spain)
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info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/openAccess
dc.embargo.terms
Cap
dc.type.version
info:eu-repo/semantics/publishedVersion
dc.identifier.idgrec
013585
dc.identifier.eissn
2013-3987