大型褐藻アラメおよびカジメの群落形成に関する実験生態学的研究 A study on the experimental ecology of establishment of marine macrophyte population of Eisenia bicyclis and Ecklonia cava (Laminariaceae, Phaeophyta).

この論文をさがす

著者

    • 寺脇, 利信 テラワキ, トシノブ

書誌事項

タイトル

大型褐藻アラメおよびカジメの群落形成に関する実験生態学的研究

タイトル別名

A study on the experimental ecology of establishment of marine macrophyte population of Eisenia bicyclis and Ecklonia cava (Laminariaceae, Phaeophyta).

著者名

寺脇, 利信

著者別名

テラワキ, トシノブ

学位授与大学

北海道大学

取得学位

博士 (環境科学)

学位授与番号

乙第4207号

学位授与年月日

1992-12-25

注記・抄録

博士論文

An urgent necessity for conservation and maintainance marine macrophyte bed, especially kelp forest consisting of Eisenia bicyclis and Eclonia cava (Laminariaceae, Phaeophyta) becomes evident for healthy human activity and continuous recruitment of marine resources,In addition, creation of amenity area in the sea is increasingly recognized in relation to the urban development. The macrophyte bed in the shallow sea plays an important role in this context, and basic knowledge on ecology of these macrophyte community is indispensable for the development of techniques concerning the creation of macrophyte bed with minimum influence by man. The aim of this study is to provide ecological knowledge on the establishment of Eisenia and Ecklonia populations on the hard substrata artificially settled on the sea bottom.   Three environmental factors, namely the light intensity, sand cover on the substratum and grazing pressure by herbivorous benthic animals, have definitive effects on development and structure of macrophyte vegetation. The effects of these factors were preliminarily assessed separately in the field choosing suitable sites as well as laboratory experiments. Eklonia vegetation was surveyed in a submarine cave in relation to the light intensity. Density and plant size diminished and disappeared at light intensity of 1 % full light. In the presence of dense sea urchin population, Eisenia cannot grow well on the coast of Fukushima Prefecture. The substratum covered seasonally with drift sand exclude the Eisenia and Ecklonia plants. The structure and distribution of Eisenia and Ecklonia were surveyed in a area to the west of Miura Peninsula, Kanagawa Prefecture, Pacific coast of central Japan, where dense population is established in the favorable environment with low intensity of grazing. Eisenia occupies rather shallow range of -2 to -4m deep and Ecklonia forms population on hard substrata of -5 to -18m.  Fluctuation of sand accumulation on the hard substrata affects the colonization and continuation of Eisenia and Ecklonia populations. Successive observation in the field confirmed that the deep sand cover on the hard substrata caused high level of mortality and eliminated the Eisenia and Ecklonia plants. Vertical distance from the surface of sandy bottom to keep each population’s stable continuance was +30cm in the case of Eisenia and +20cm in the case of Ecklonia populations by the yearly average values. Laboratory experiments showed that the fibrous foldfast and growing point of Ecklonia are easily damaged by sand deposition than those of Eisenia. Species of Sargassum, other brown algal macrophyte, can tolerate the sand cover than Eisenia and Ecklonia. This affects the structure of macrophyte vegetation near sandy bottom, where a species of Sargassum grow in place of Ecklonia. Artificial substrata of concrete blocks of various size were settled on the sandy bottom at about -10 m deep to follow up the process of establishment of vegetation on them. Ecklonia population developed on the blocks, with a half of density and slightly smaller plant size as on the natural habitat, in three years after setting. Smaller blocks were often covered by sand. The temporal coverage by sand on the blocks caused certain modification of vegetation structure. Smaller blocks supported shorter Ecklonia plants than taller and larger blocks. Several Eisenia individuals grew on the blocks mixing with Ecklonia. This might be caused by the higher water turbidity, stronger wave action, drift sand and insolation than on the natural rocks. The results obtained in this study provide a basic information in creation of artificial macrophyte beds, in selecting suitable sites and proper planning of artificial substrata.

115p.

Hokkaido University (北海道大学). 博士(環境科学)

目次

  1. 目次 / (0003.jp2)
  2. 第1章 研究の目的および方法概要 / p1 (0004.jp2)
  3. 1. 研究の背景 / p1 (0004.jp2)
  4. 2. 既存研究の整理 / p2 (0005.jp2)
  5. 3. 本研究の目的 / p5 (0006.jp2)
  6. 4. 方法の概要 / p5 (0006.jp2)
  7. 第2章 アラメ・カジメ類の生息制限要因 / p7 (0007.jp2)
  8. 1. 現地調査地点の選定 / p7 (0007.jp2)
  9. 2. 要因別の検討 / p8 (0008.jp2)
  10. 3. 要約 / p17 (0012.jp2)
  11. 第3章 三浦半島西部におけるアラメおよびカジメ群落 / p18 (0013.jp2)
  12. 1. 海底地形および底質の分布 / p18 (0013.jp2)
  13. 2. アラメ,カジメおよび大型藻色動物の分布 / p22 (0015.jp2)
  14. 3. 群落の季節変化 / p30 (0019.jp2)
  15. 4. 群落の形成過程 / p33 (0020.jp2)
  16. 5. 群落の光および水質環境 / p36 (0022.jp2)
  17. 6. 要約 / p38 (0023.jp2)
  18. 第4章 砂底と接する岩礁でのアラメおよびカジメ群落 / p40 (0024.jp2)
  19. 1. 方法 / p41 (0024.jp2)
  20. 2. 結果 / p44 (0026.jp2)
  21. 3. 考察 / p70 (0039.jp2)
  22. 4. 要約 / p74 (0041.jp2)
  23. 第5章 アラメおよびカジメの生育への砂の被覆の影響 / p76 (0042.jp2)
  24. 1. 方法 / p77 (0042.jp2)
  25. 2. 結果 / p81 (0044.jp2)
  26. 3. 考察 / p84 (0046.jp2)
  27. 4. 要約 / p87 (0047.jp2)
  28. 第6章 砂底に設置した実験用ブロックでのカジメ群落の構造 / p88 (0048.jp2)
  29. 1. 方法 / p88 (0048.jp2)
  30. 2. 結果 / p93 (0050.jp2)
  31. 3. 考察 / p95 (0051.jp2)
  32. 4. 要約 / p98 (0053.jp2)
  33. 第7章 総合考察 / p100 (0054.jp2)
  34. 適用 / p103 (0055.jp2)
  35. 要結 / p105 (0056.jp2)
  36. 謝辞 / p106 (0057.jp2)
  37. 参考文献 / p108 (0058.jp2)
  38. Summary / p114 (0061.jp2)
2アクセス

各種コード

  • NII論文ID(NAID)
    500000092769
  • NII著者ID(NRID)
    • 8000000092995
  • DOI(NDL)
  • 本文言語コード
    • jpn
  • NDL書誌ID
    • 000000257083
  • データ提供元
    • 機関リポジトリ
    • NDL-OPAC
    • NDLデジタルコレクション
ページトップへ