Predicting zooplankton response to environmental changes in a temperate estuarine ecosystem
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A novel strategy that allows to predict the responses of zooplanktonic species to environmental conditions in an estuarine temperate ecosystem (Mondego estuary) is presented. It uses 12 indicator species from the zooplanktonic Mondego database (102 species) that are common members of the different habitats, characterized by their specific hydrological conditions. Indicator-species analysis (ISA) was used to define and describe which species were typical of each of the five sampling stations in a 4-year study (2003–2006). First, a canonical correspondence analysis (CCA) was carried out to objectively identify the species-habitat affinity based on the relationship between species, stations and environmental data. Response curves for each of the zooplanktonic species, generated by univariate logistic regression on each of the independent variables temperature and salinity, were generally in agreement with the descriptive statistics concerning the occurrence of those species in this particular estuarine ecosystem. Species-specific models that predict probability of occurrence relative to environmental parameters like salinity, water temperature, turbidity, chlorophyll a, total suspended solids and dissolved oxygen were then developed for the zooplanktonic species. The multiple logistic models used contained between 1 and 3 significant parameters and the percentage correctly predicted was moderate to high, ranging from 62 to 95%. The predictive accuracy of the model was assured by direct comparison of model predictions with the observed occurrence of species obtained in 2006 (validation) and from data collected in the early 2000s in another Portuguese estuary—Ria de Aveiro (Canal de Mira), a complex mesotidal shallow coastal lagoon. The regression logistic model here defined, correctly suggested that the distribution of zooplankton species was mainly dependent on salinity and water temperature. The logistic regression proved to be a useful approach for predicting the occurrence of species under varying environmental conditions at a local scale. Therefore, this model can be considered of reasonable application (and should be tested in other estuarine systems) due to its ability to predict the occurrence of individual zooplanktonic species associated with habitat changes.
KeywordsTotal Suspended Solid Indicator Species Zooplanktonic Community Zooplanktonic Species Estuarine Ecosystem
The present work was supported by I.·I. I. (Instituto de Investigação Interdisciplinar of the University of Coimbra) through a Ph.D grant awarded to S. C. Marques (III/AMB/28/2005). A special thanks to all colleagues who helped during field work.
- Azeiteiro UMM, Marques JC, Ré P (1999) Zooplankton annual cycle in the Mondego river estuary (Portugal). Arq Mus Bocage 3:239–263Google Scholar
- Badosa A, Boix D, Brucet S, López-Flores R, Gascón S, Quintana XD (2007) Zooplankton taxonomic and size diversity in Mediterranean coastal lagoons (NE Iberian Peninsula): influence of hydrology, nutrient composition, food resource availability and predation. Estuar Coast Shelf Sci 71:335–346. doi: 10.1016/j.ecss.2006.08.005 CrossRefGoogle Scholar
- Day J, Hall CAS, Kemp WM, Yanez-Arancibia A (1989) Estuarine ecology. Wiley, New YorkGoogle Scholar
- Dufrene M, Legendre P (1997) Species assemblages and indicator species: the need for a flexible asymmetrical approach. Ecol Monogr 67(3):345–366Google Scholar
- IPCC (2007) Climate change 2007: the Physical Science Basis. Summary for Policymakers, Paris, February 2007Google Scholar
- Pardal MA, Marques JC, Metelo I, Lillebø AI, Flindt MR (2000) Impact of eutrophication on the life cycle, population dynamics and production of Ampithoe valida (Amphipoda) along an estuarine spatial gradient (Mondego estuary, Portugal). Mar Ecol Prog Ser 196:207–219. doi: 10.3354/meps196207 CrossRefGoogle Scholar
- Roddie BD, Leakey RJG, Berry AJ (1984) Salinity-temperature tolerance and osmoregulation in Eurytemora affinis (Poppe) (Copepoda: Calanoida) in relation to its distribution in the zooplankton of the upper reaches of the Forth estuary. J Exp Mar Biol Ecol 79:191–211. doi: 10.1016/0022-0981(84)90219-3 CrossRefGoogle Scholar
- Ter Braak CJF, Smilauer P (1998) CANOCO Reference Manual and User’s Guide to Canoco for Windows: Software for Canonical Community Ordination (version 4). Microcomputer Power, Ithaca, New YorkGoogle Scholar