Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Coordinates of the investigated sampling sites
| Off the Cape of Stillo | Butrinti Lake | |
|---|---|---|
| Sampling 2015 | 39°41’19.7”N | 39°45’09.3”N |
| 19°59’28.1”E | 20°01’35.3”E | |
| Sampling 2019 | 39°41’16.6”N | 39°45’22.6”N |
| 19°59’05.8”E | 20°01’53.6”E | |
| Sampling 2021 | 39°41’26.5”N | 39°45’18.1”N |
| 19°59’49.4”E | 20°02’22.6”E |
Descriptive statistics from Butrinti Lake and Cape of Stillo in 2015, 2019 and 2021
| Study area | N | Range | Mean | Std. deviation | Variance |
|---|---|---|---|---|---|
| Cape of Stillo (2015) | 9 | 80 | 44.111 | 31.0743 | 965.611 |
| Butrinti lake (2019) | 9 | 25 | 35.733 | 10.00587 | 100.118 |
| Butrinti lake (2021) | 9 | 66.7 | 23.144 | 24.9266 | 621.335 |