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to longitudinal and latitudinal variations. However, it is very difficult to assess which is the pre-
dominant factor, because they are often cross-correlated. An extensive monitoring of selected
parameters from Posidonia meadows would be necessary, including traditionally acknowledged
and new generation indicators, in particular from the southern and eastern Mediterranean basin,
for assessing the existence of latitudinal and/or longitudinal spatial patterns and at which scale
they operate.

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