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| Titel |
Limnological characteristics and trophic state of a newly created site: the Pareja Limno-reservoir |
| VerfasserIn |
E. Molina-Navarro, S. Martínez-Pérez, A. Sastre-Merlín |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069992
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| Zusammenfassung |
| The creation of dams in the riverine zone of large reservoirs is an innovative action whose
primary goal is to generate water bodies that ensure a stable level of water there. We have
termed these bodies of water “limno-reservoirs” because their water level becomes constant
and independent of the fluctuations occurring in the main reservoir. In addition,
limno-reservoirs represent environmental initiatives with corrective and/or compensatory
effects. Pareja Limno-reservoir, located near the left side of Entrepeñas Reservoir
(Guadalajara province, central Spain), is one of the first initiatives of this type in Spain.
We are investigating the hydrology, limnology, microbiology, siltation risk and
other aspects of this site. This research has a special interest since the building of
limno-reservoirs is rising in Spain. To acquire knowledge about their behavior may
be helpful for further constructions. In fact, every new reservoir building project
usually includes a limno-reservoir. Moreover, there are many initiatives related with
the construction of this kind of hydraulic infrastructures in the reservoirs under
exploitation.
This work focuses on the limnological study of the Pareja Limno-reservoir. To conduct
this research, twelve seasonal sample collections at two sampling points (the dam and inflow
zones) have been made in Pareja Limno-reservoir, from spring 2008 to winter 2011.
The primary goal of this study is to describe the limnological characteristics of the
limno-reservoir. Special interest is placed in the study of the trophic state through different
indicators (nutrients, transparency, phytoplankton and zooplankton populations), as the
European Water Framework Directive objective is to achieve a “good ecological status” in
every aquatic ecosystem by 2015.
The results of the study show that the Pareja Limno-reservoir follows a warm monomictic
water stratification pattern. Water was slightly alkaline and conductivity values were mostly
over 1000 μS cm-1 due to the high SO4= concentrations. The highest N and P
levels were found in the winter, whereas the highest chlorophyll aand phytoplankton
biomass values were found in the summer and autumn. The total zooplankton species
richness was high, especially in the inflow zone. Globally, the results obtained suggest
that the Pareja Limno-reservoir is oligo-mesotrophic, so it may be under the WFD
requirements, although some differences were found using a variety of trophic state criteria. |
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