Abstract
We investigated the potential associations of habitat type richness patterns with a series of environmental variables in 61 protected aquatic ecosystems of the Greek Natura 2000 network. Habitat type classification followed the Natura 2000 classification scheme. Habitat type richness was measured as the number of different habitat types in an area. To overcome a potential area effect in quantifying habitat type richness, we applied the “moving window” technique. The environmental variables were selected to account for some of the major threats to biodiversity, such as fragmentation, habitat loss and climate change. We run GLMs to associate habitat type richness with different combinations of climatic, spatial and topographic variables. Habitat type richness seemed to significantly associate with climatic variables, more than spatial or topographic ones. In particular, for the climatic ones, the importance of precipitation surpassed that of temperature and especially the precipitation of the wettest and driest month had a limiting contribution to richness unlike average climate estimators. Moreover, the landscape’s latitude and longitude and fragmentation were significantly associated to richness. Our findings are in accordance to those observed in recent literature at lower (i.e. species) levels of ecological organization, fact showing that large-scale phenomena (such as climate change) can also be observed at the habitat type level, at least in our case. Thus, following the context of the Habitats Directive (92/43/EEC), that habitat types and not solely species of community interest should be protected and restored, this study serves as a first step towards investigating habitat type richness patterns.
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Abbreviations
- EEC:
-
European ecological community
- EC:
-
European commission
- GLM:
-
Generalized linear model
- AIC:
-
Akaike’s information criterion
- ΔAIC:
-
Difference in AIC values
- IPCC:
-
Intergovernmental panel on climate change
- SD:
-
Standard deviation
- CV:
-
Coefficient of variation
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Acknowledgments
This research project was co-financed by EU—European Social Fund (75%) and the Greek Ministry of Development-GSRT (25%). We would like to acknowledge the Greek Ministry of the Environment for making the site maps and relevant data available. Finally, we would like to acknowledge an anonymous reviewer for the useful comments that significantly improved our manuscript.
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Drakou, E.G., Kallimanis, A.S., Mazaris, A.D. et al. Habitat type richness associations with environmental variables: a case study in the Greek Natura 2000 aquatic ecosystems. Biodivers Conserv 20, 929–943 (2011). https://doi.org/10.1007/s10531-011-0005-4
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DOI: https://doi.org/10.1007/s10531-011-0005-4