engleski

Does heterogeneity of habitats/landcover reflects on the composition of Grime CSR strategies of invasive plants across different landscape scales?

We have studied the composition of Grime CSR strategies among invasive flora of Croatia, across three different spatial resolutions spanning from 10 km grid to NATURA2000 biogeographical regions. Altogether, over 11000 distributional records of 57 invasive plants in Croatia were taken from the Flora Croatica Database, while Corine Land Cover and Habitat map of Croatia were used as thematic maps for calculating landscape metrics. The relationship between CSR strategies (converted into "C", "S" and "R" values) and the level of habitat/landcover heterogeneity was analysed, as well as possible correlation between CSR strategies and shares of different landcover/habitat types within basic spatial units. The largest proportion of R-strategists and the heighest heterogeneity was found in the Mediterranean region, while the largest proportion of C-strategists and the lowest heterogeneity was found in the Alpine region. When converted into "C", "S" ans "R" values, "C" was found positively and "R" negatively correlated with several landscape indices, while "S" was without any significant correlations at middle-scale spatial resolution. However, on a finest spatial resolution there were almost no significant correlations. The sharess of landcover/habitat types within spatial units (excluding the biogeographical resolution) did not yield any significant correlation with CSR strategies for landcover at 10 km spatial resolution, while for habitats, as well as for landcover and habitats at medium spatial resolution (i.e. spatial overlap of counties and biogeographical regions) there was a negative correlation of C-strategists with natural vegetation and and positive with portion of agricultural land (excluding grasslands). At finest spatial scale (i.e. 10 km grid), S-strategists were found positively correlated with grasslands, and negatively correlated with agricultural areas. Landscape pattern has a potential in explaining the composition of CSR strategies of invasive plants, but to obtain clearer results on finer spatial resolutions, distributional data should be collected systematically for this purpose.

biogeographical regions; Croatia; NATURA2000; habitats; Corine Land Cover

nije evidentirano