ISSN:
1573-5133
Keywords:
Brackish water
;
Biological rythm
;
Eye structure
;
Light-dark cycle
;
Light intensity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Synopsis Activity patterns of some common Baltic fish species and macrocrustaceans have been investigated in natural light/dark conditions — in most cases for periods of at least one full year. The fauna of the northern Baltic proper consists of species of both marine and freshwater origin, with both types represented in the study. The different patterns found are discussed in relation to light period, light intensity and to the structure and function of the eyes. The following species were considered nocturnal: Idothea baltica, Mesidothea entomon, Gammarus oceanicus, Palaemon adspersus, Anguilla anguilla, Spinachia spinachia, Pholis gunnellus, Zoarces viviparus, Scopthalmus maximus, and Platichtys flesus. These species were considered diurnal: Clupea harengus, Scardinius erythrophthalmus, Gasterosteus aculeatus, Perca fluviatilis, Gobius niger, Taurulus bubalis, and Cyclopterus lumpus. The next three species showed a crepuscular pattern of activity: Praunus flexuosus, Esox lucius and Gymnocephalus cernus. Four species were considered to show inversions of the activity patterns: Pungitius pungitius, Pomatoschistus minutus, Myoxocephalus scorpius and M. quadricornis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00002025
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