The effect of irradiance and temperature on the germination of four species of Fucales

Terry, Lynne A.; Moss, Betty

doi:10.1080/00071618100650131

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…Responses of fucoid germlings to variations in environmental factors have been extensively studied in laboratory experiments, but few have compared responses of more than two species (McLachlan & al. 1971;Terry 1979;Schonbeck & Norton 1980a). Although a standard procedure for the use of fucoid germlings as laboratory test organisms has been suggested (Thursby & Steele 1995), culture conditions often vary across studies.…”

Section: Introductionmentioning

confidence: 95%

Comparison of survival and growth in germlings of six fucoid species (Fucales, Phaeophyceae) at two different temperature and nutrient levels

Steen

Rueness

2004

Sarsia

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H, Rueness J. 2004. Comparison of survival and growth in germlings of six fucoid species (Fucales, Phaeophyceae) at two different temperature and nutrient levels. Sarsia 89:175-183. SARSIADuring their initial post-settlement period, fucoid germlings will be exposed to large variations in environmental factors such as temperature and nutrient concentration, which may influence survival and growth. Factorially designed culture experiments were used to compare the effects of temperature and nutrient concentration on the survival and growth of germlings in six fucoid species from the Norwegian Skagerrak coast. In four of the species (Ascophyllum nodosum, Fucus evanescens, F. serratus, and F. vesiculosus), survival did not differ between the two temperatures tested (7 and 17°C), whereas survival was reduced at 7°C in F. spiralis and Sargassum muticum. The effect of nutrient enrichment (seawater enriched with 32 mmol N and 2 mmol P per litre) on germling growth depended on the temperature regime, and differed little between species. The relative growth rate of germlings increased with increasing temperature in all six species and was higher in S. muticum ($0.21 day À1 ) than in the other fucoids (0.09-0.14 day À1 ) at 17°C. At 7°C, F. serratus germlings had the highest relative growth rate ($0.13 day À1 ), whereas those of S. muticum and F. spiralis were reduced to $0.05 and $0.03 day À1 , respectively. These results are in accordance with the reproductive season for the species, as germlings of the summer/autumn reproducers, F. spiralis and S. muticum, were less tolerant to low temperatures than the other Skagerrak fucoids whose reproduction occurs earlier in the year. Egg volume varied almost 10-fold across species, from F. vesiculosus (smallest) to S. muticum (largest), and showed no correlation with relative growth rates or survival, wherease the size of germlings was positively related to egg volume after 15 days of cultivation under nutrient-enriched conditions at 17°C. These results suggest that summer reproduction, larger eggs and a higher growth rate of germlings may give the introduced species, S. muticum, a competitive advantage.

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Section: Introductionmentioning

confidence: 95%