ISSN:
1573-5176
Keywords:
Chaetoceros
;
diatoms
;
salmon
;
light
;
temperature
;
salinity
;
growth rate
;
factor interactions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Chaetoceros convolutus and C. concavicornis have been implicated in the death of salmon in netpens in the Pacific Northwest by damaging the salmon's gills. To better understand how environmental factors affect the distribution of these two species, the interacting effects of light, temperature and salinity on growth rate were examined by growing these species under a range of temperatures (4–18 °C), light (10–175 µmol photon m−2 s−1) and salinities (10–30‰). For C. convolutus, the growth rate showed a hyperbolic relationship with irradiance at 8, 14 and 18 °C and light saturation occurred at 9, 14 and 20 µmol photon mt s−1 respectively. At 4 °C for C. convolutus and 8 °C for C. concavicornis, cells grew at µmax, even at the lowest irradiances tested (10 µmol photon m−2 s−1). For C. convolutus, the amount of light required to saturate growth rate increased with temperature in an approximately linear fashion. The Q10 was 1.88, calculated by averaging over both species. C. concavicornis was the more euryhaline species growing at salinities as low as 17.5‰, while C. convolutus grew only at 25‰ and above.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00004028
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