Comparison in Biomass, Density and Age Composition of Ecklonia cava Populations in Two Localities with Different Temperature Conditions.

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  • 水温環境の異なる２つの生育地のカジメ群落における現存量，密度，年齢組成の比較
  • スイオン カンキョウ ノ コトナル 2ツ ノ セイイクチ ノ カジメ グンラク ニ オケル ゲンソンリョウ ミツド ネンレイ ソセイ ノ ヒカク

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Abstract

Ecklonia cava populations at Tei, Tosa Bay and Nabeta Bay, Shimoda, Izu Peninsula were compared seasonally from 1995 to 1997 by quadrate sampling. Water temperatures between the two sites differ by 2-4°C on average, with Tei being the warmer site. The mean thallus wet weights at Tei ranged from 60.9 g (January) to 216.2 g (June) and from 329.4 g (January) to 720.5 g (October) in Nabeta Bay. The biomass was low in winter and high from spring to summer in both localities, ranging from 1.9-4.3 kg w.w./m2 at Tei and 4.9-10.7 kg w.w./m2 in Nabeta Bay. The bio-mass was lower at Tei than in Nabeta Bay at all times. The density at Tei ranged from 34-53 ind./m2 (10-19 ind./m2 in plants of 1 year old and over, 16-34 ind./m2 in plants of O year old). At Nabeta Bay the density ranged from 15-40 ind./m2 (12-17 ind./m2 in plants of 1 year old and over, 3-26 ind./m2 in plants of O year old). At Tei, the O-1 y age group was dominant and the 2-3 y age group was rare throughout the year, whilst in Nabeta Bay, the O y age group was dominant from winter to spring, and the 5 y age group was recorded infrequently.

Journal

  • Aquaculture Science

    Aquaculture Science 49 (1), 9-14, 2001

    Japanese Society for Aquaculture Science

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