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Table 5
Spearman's rank significant correlation coefficient (R) for five dragonfly species and physico-chemical water properties in Plitvice Lakes NP. Sample size (N) = 366, ***p < 0.001, **p < 0.01, *p < 0.05.
| Dragonfly species | Physico-chemical water properties | R | t(N − 2) | p-Value |
|---|---|---|---|---|
| Onychogomphus forcipatus | Water temperature | 0.22 | 4.37 | *** |
| pH | 0.33 | 6.75 | *** | |
| Conductivity | −0.42 | −8.84 | *** | |
| Alkalinity | −0.40 | −8.48 | *** | |
| Nitrate ions | −0.21 | −4.02 | *** | |
| Oxygen concentration | −0.15 | −2.97 | ** | |
| Cordulegaster bidentata | Alkalinity | −0.13 | −2.40 | * |
| Orthetrum coerulescens | Conductivity | −0.14 | −2.71 | ** |
| Alkalinity | −0.15 | −2.97 | ** | |
| pH | 0.11 | 2.05 | * | |
| Platycnemis pennipes | Water temperature | 0.19 | 3.67 | *** |
| Conductivity | −0.23 | −4.39 | *** | |
| Alkalinity | −0.23 | −4.47 | *** | |
| Water velocity | −0.15 | −2.82 | ** | |
| pH | 0.17 | 3.27 | ** | |
| Nitrate ions | −0.16 | −3.07 | ** | |
| Oxygen concentration | −0.12 | −2.28 | * | |
| Calopteryx virgo | Alkalinity | −0.14 | −2.70 | ** |
| Water temperature | 0.13 | 2.45 | * | |
| Oxygen concentration | −0.11 | −2.01 | * | |
| Conductivity | −0.11 | −2.10 | * | |
| Nitrate ions | −0.12 | −2.33 | * |
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