Bad matching between hatching and acidification: a pitfall for the burbot, Lota lota, off the river Kyrönjoki, Baltic Sea
| Autor: | Richard Hudd, Jakob Kjellman |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
0106 biological sciences
geography Larva geography.geographical_feature_category biology Hatching 010604 marine biology & hydrobiology Drainage basin Environmental factor Sediment 010501 environmental sciences Aquatic Science Gadidae biology.organism_classification medicine.disease_cause 01 natural sciences Spawn (biology) Fishery medicine Fish kill 14. Life underwater 0105 earth and related environmental sciences |
| Zdroj: | Fisheries Research. 55:153-160 |
| ISSN: | 0165-7836 |
| DOI: | 10.1016/s0165-7836(01)00303-4 |
| Popis: | The episodic acid runoff from the catchment areas of rivers with sulphide-bearing fine-grained sediments caused recruitment failures of burbot ( Lota lota ) in the Gulf of Bothnia. In the episodically acid river Kyronjoki, emptying into the Gulf of Bothnia, the Baltic Sea, the burbot spawn in winter and the eggs were calculated on average to hatch on 10 May. This date coincided with the period observed to hamper the burbot year-class formation in 1983–1993. The number of days with pH lower than 5.3 during 7–27 May correlated negatively ( r p =−0.68, n =11) with year-class strength. The timing of the acid period was more harmful to recruitment than the severity of the episodic environmental disturbance. Successful recruitment was possible even if pH had been below 5.3 for several weeks previous to the hatching. We concluded that low pH, within one month after hatching, caused mass larvae kills, subsequently leading to burbot recruitment failures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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