Dark respiration of the stipe of Ecklonia cava (Laminariales, Phaeophyta) in relation to temperature |
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Authors: | Yukihiko Serisawa Yasutsugu Yokohama Yusho Aruga Jiro Tanaka |
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Institution: | Marine Biosystems Research Center, Chiba University, Amatsu-kominato, Awa-gun, Chiba 299-5502 (JSPS Research Fellow);Shizugawa Nature Center, Togura Aza Sakamoto 40, Shizugawa, Miyagi 986-0781, Japan;Department of International Agriculture Development, Tokyo University of Agriculture, Sakuragaoka 1-1-1, Setagaya-ku, Tokyo 156-8502, Japan;Laboratory of Phycology, Tokyo University of Marine Science and Technology, Konan 4-5-7, Minato-ku, Tokyo 108-8477, Japan |
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Abstract: | Sporophytes of Ecklonia cava Kjellman (Laminariales, Phaeophyta) with a stipe length of 22–102 cm were collected at 6–9 m depth in Nabeta Bay, Shimoda, central Japan by scuba diving in February (winter) and in August (summer) 1998. Dark respiration of the intact stipe of E. cava was measured at various water temperatures ranging from 15 to 27.5°C in winter and 15–30°C in summer in a closed system by using a dissolved oxygen meter. The stipe respiration was compared on whole stipe, length, surface area, volume, wet weight and dry weight bases. On each basis, the stipe respiration always increased with a rise in water temperature within the temperature range investigated. The stipes showed similar respiration rates on each basis of length, surface area, volume, wet weight and dry weight at each temperature, irrespective of the stipe length. The mean respiration rates in winter (at 15–27.5°C) were: length, 16.7–32.5 μL O2 cm?1 h?1; surface area, 3.2–6.2 μL O2 cm?2 h?1; volume, 7.6–15.0 μL O2 cm?3 h?1; wet weight, 6.2–12.2 μL O2 g (wet weight)?1 h?1; and dry weight, 43.8–88.0 μL O2 g (dry weight)?1 h?1. Those for summer (at 15–30°C) were: length, 17.1–32.0 μL O2 cm?1 h?1; surface area, 3.6–6.8 μL O2 cm?2 h?1; volume, 9.7–18.7 μL O2 cm?3 h?1; wet weight, 7.6–14.6 μL O2 g (wet weight)?1 h?1; and dry weight, 49.4–95.8 μL O2 g (dry weight)?1 h?1. This is the first report of the intact stipe respiration of E. cava at various temperatures. |
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Keywords: | dark respiration Ecklonia cava Laminariales Phaeophyta stipe temperature |
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