Publication
Environmental forcing of crustacean zooplankton in a Mediterranean Reservoir (River Douro Watershed, North-western Iberia): Effects on species abundance and variability
| dc.contributor.author | Geraldes, Ana Maria | |
| dc.contributor.author | Afonso, Silvino | |
| dc.date.accessioned | 2018-03-01T14:02:57Z | |
| dc.date.available | 2018-03-01T14:02:57Z | |
| dc.date.issued | 2014 | |
| dc.description.abstract | A 8-yr record of monthly observations (2000-2002 and 2007- 2011) in Azibo Reservoir were used (1) to describe crustacean zooplankton interannual and seasonal variability; (2) to understand the environmental forcing underlying zooplankton dynamics. This reservoir was chosen because unlike the majority of existing reservoirs, water level fluctuations are not very pronounced, never exceeding 3m. Furthermore, the introduction of pike (Esox lucius L.) in the 1990’s led to a marked reduction of cyprinid fish abundance. Consequently, fish predatory pressure is regarded to be too low to drive zooplankton community. Without the interference of internal disturbances generated by extreme anthropogenic water level fluctuations and by fish predation on the zooplankton, this reservoir provides a good environment for studying the reservoir general limnology, filling the lack of long term data on this kind of aquatic ecosystems. ANCOVA and Pearson correlation analyses indicated that total phosphorus, Secchi depth, conductivity and pH, as well as, cyanobacteria and diatoms abundance were significantly related to precipitation. A seasonal cycle in zooplankton composition common to all the years sampled was identified. This pattern consisted of a marked separation between a winter and a summer assemblage (ANOSIM: R=0.841; p=0.01). The winter zooplankton assemblage was characterized by a higher abundance of Daphnia longispina/pulex. By contrast, in summer and autumn Ceriodaphnia pulchella, Diaphanosoma brachyurum and the copepod C. numidicus were dominant. BIOENV analysis identified temperature, conductivity, Secchi depth, diatoms and cyanobacteria abundance as the environmental variables most highly forcing seasonal zooplankton composition and species abundance. Results also provided evidence of interannual variability in the timing of zooplankton succession. In fact, the timing of appearance and/or annual peak densities varied among years. These data on crustacean zooplankton assemblage will certainly to provide a baseline against which future changes on this reservoir can be measured, allowing the evaluation and the prediction of the impacts of land use modifications and of climate change on ecosystem integrity. Furthermore, the obtained information can also be extrapolated to other Mediterranean reservoirs. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.citation | Geraldes, Ana Maria; Afonso, Silvino (2014). Environmental forcing of crustacean zooplankton in a Mediterranean Reservoir (River Douro Watershed, North-western Iberia): effects on species abundance and variability. In XVII Congresso of Iberian Association of Limnology. Santander | pt_PT |
| dc.identifier.uri | http://hdl.handle.net/10198/16081 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt_PT |
| dc.title | Environmental forcing of crustacean zooplankton in a Mediterranean Reservoir (River Douro Watershed, North-western Iberia): Effects on species abundance and variability | pt_PT |
| dc.type | conference object | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Santander | pt_PT |
| oaire.citation.title | XVII Congresso of Iberian Association of Limnology University of Cantabria | pt_PT |
| person.familyName | Geraldes | |
| person.givenName | Ana Maria | |
| person.identifier.ciencia-id | 7D13-2CED-D6C5 | |
| person.identifier.orcid | 0000-0003-4966-2227 | |
| person.identifier.rid | J-8566-2014 | |
| person.identifier.scopus-author-id | 57204313331 | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | conferenceObject | pt_PT |
| relation.isAuthorOfPublication | 6e872389-a4ae-407d-b2cf-c2c8743dcd44 | |
| relation.isAuthorOfPublication.latestForDiscovery | 6e872389-a4ae-407d-b2cf-c2c8743dcd44 |