Table 1.

Trends in the zooplankton community (concentration, morphological and taxonomic diversity indices, values of morphological traits) and environmental variables over the 12-year period (2009–2020) obtained from generalized least squares (GLS) regression. For each index and variable, the slope describes the direction and intensity of the trend per year, the R² shows how much variance this linear model captures, and asterisks indicate significance with p < 0.001 (***), p < 0.01 (**) and p < 0.05 (*).

zooplankton				environment
variable	slope	R2	sig.	variable	slope	R2	sig.
concentration	-74.6	9.4	***	temperature	4.9 10−2	8.9	**
morphological richness	9.4 10−3	11.1	**	salinity	9.0 10−3	20.3	*
morphological evenness	5.7 10−3	6.6	***	density	-2.4 10−3	7.6
morphological divergence	6.0 10−3	4.7		oxygen	3.6 10−2	18.9	***
taxonomic richness	4.8 10−1	11.3	***	${\mathrm{NO}}_2^{-}$	-1.3 10−3	14.1
taxonomic evenness	9.4 10−3	4.4		${\mathrm{NO}}_3^{-}$	6.1 10−3	15.5
taxonomic diversity	1.4 10−3	4.4		${\mathrm{PO}}_4^{3-}$	-1.6 10−3	18.2	*
size-mean	2.2 10−2	12.6		SiOH4	-3.1 10−2	13.4
-var	9.3 10−2	9.4	*	POC	-3.6	16.3	***
-q25	-5.8 10−2	6.3	***	PON	-1.9 10−1	10.7	*
-q75	8.3 10−2	11.3		Chl. a	1.3 10−2	12.6	***
transparency-mean	3.3 10−2	5.1	*
-var	3.6 10−2	2.3	**
-q25	9.9 10−3	2.9
-q75	5.3 10−2	2.7	***
circularity-mean	-4.7 10−2	4.1	**
-var	3.3 10−2	6.9
-q25	-4.2 10−2	2.3	*
q75	-3.5 10−2	4.2	***
complexity-mean	-1.2 10−2	2.5
-var	9.6 10−3	10.1
-q25	-2.8 10−3	10.5
-q75	-1.5 10−2	5.6