Erdős L, M Zalatnai, Z Bátori et al: Transitions between community complexes...(2014)

Erdős L., Zalatnai M., Bátori Z., Körmöczi L.
2014
Transitions between community complexes: a case study analysing gradients through mountain ridges in South Hungary.
Acta Botanica Croatica 73: pp. 63-77.
Angol nyelvű összefoglaló: 

The study of boundaries is a recurring theme in ecology. However, boundaries
have been examined mainly on fine scales (between communities) and on coarse scales
(between biomes), while boundaries of intermediate scales (e.g. between community complexes)
are quite neglected. In this study, we analysed boundaries between mesic and xeric
community complexes in a sub-Mediterranean karst area of South Hungary. We applied
the moving split window (MSW) technique for boundary analysis. First, since the behaviour
ofMSWconcerning complex vegetation patterns is not fully understood, we prepared
artificial datasets (simulated communities) to test its capacities. Second, we established
north-south oriented belt transects across mountain ridges of the Villány Mts, and investigated
the transition between the community complexes of differently exposed slopes. UsingMSW,
we were able clearly to distinguish between transitional zones and zones that do
not represent real transitions: peaks in the Z-score profile of MSW merge only in the case
of transitional zones. Moreover, we found that peaks merge depending on the independence
(distinctness) of the transitional zone: when it is distinct, peaks merge only at the largest
window widths. In the Villány Mts, transitions seem to occur mostly in the grasslands
north of the ridges. We demonstrated that these grasslands can be regarded as boundaries
between mesic and xeric complexes or as zones in their own right, with their own two
boundaries. Interpretation depends upon the scale of observation.