TEMPERATURE REQUIREMENTS FOR GROWTH AND SURVIVAL OF MACROALGAE FROM DISKO ISLAND (GREENLAND)

被引:41
作者
BISCHOFF, B
WIENCKE, C
机构
[1] Institute for Polar and Marine Research, Bremerhaven, D-27570
来源
HELGOLANDER MEERESUNTERSUCHUNGEN | 1993年 / 47卷 / 02期
关键词
D O I
10.1007/BF02430357
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
The temperature requirements for growth and upper temperature tolerance were determined in 16 macroalgal species collected on Disko Island (Greenland). The upper survival temperatures were examined in 1-degrees-C steps, and growth measured at 5-degrees-C intervals between 0 and 20-degrees-C using a refined method, where the fresh weight was determined weekly or fortnightly over a period of 5 or 6 weeks. To express temperature-growth responses, growth rates of temperature-acclimated plants were taken. Two groups with different temperature requirements were identified: (1) A stenothermal group including Acrosiphonia arcta, Acrosiphonia sonderi, Urospora penicilliformis, Devaleraea ramentacea, Desmarestia aculeata, Pilayella littoralis, growing between 0 and (10 to) 15 (or 20)-degrees-C with optima between 0 and 10-degrees-C. The upper survival temperatures in these species and in Chromastrum secundatum, Chromastrum virgatulum, Chordaria flagelliformis were between 17 and 23-degrees-C (duration of experiment: 2 weeks). (2) A eurythermal group including Enteromorpha clathrata, Enteromorpha intestinalis and Polysiphonia urceolata growing between 0 and 20-degrees-C with growth optima at 10 or 15-degrees-C. The upper survival temperatures in these species and in Chaetomorpha tortuosa, Bangia atropurpurea and Eudesme virescens were between 24 and 31-degrees-C. These algal species showed little adaptation to the Arctic temperatures. In contrast, algae from the first group exhibited a relatively high adaptation to low temperatures - approaching the low temperature requirements of Antarctic algae. The results are discussed in relation to the geographic distribution of individual species.
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页码:167 / 191
页数:25
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