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周防灘におけるメイオベントスの生態学的研究
https://fra.repo.nii.ac.jp/records/2003262
https://fra.repo.nii.ac.jp/records/20032627442dd11-ebdc-407b-bc79-2bdea9fc48b2
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2024-04-25 | |||||
| タイトル | ||||||
| タイトル | 周防灘におけるメイオベントスの生態学的研究 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Ecological Studies of Meiobenthos in Suo-nada | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
酒井, 保次
× 酒井, 保次 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | A good deal of attention is being paid to the importance of meiobenthos in coastal shallow waters, for their significance as food for demersal fish and other marine organisms. Meiobenthos is also useful as the indicator organism to identify the quality of bottom sediments from environmental aspects. From the fisheries point of view, the ecological characteristics of meiobenthos are important in relation to the feature of bottom sediments and to the fishing ground of demersal fish. By the present investigation, the distribution of meiobenthos in Suo-nada, Seto Inland Sea, was first clarified. Then, the relations between the amout of catch of demersal fish and the findings in the present study were analysed for respective area and species. 1. The mean number of individuals of meiobenthos in Suo-nada was about 800 per 100 cm2, and consisted mainly of nematodes, polychaetes and benthic copepods. These animals were found abundantly close to the surface of sediments. They actually distributed more deeper in sandy mud than muddy bottom, and were found from the surface down to 5cm in depth. 2. Meiobenthos was abundant in autumn, while scarce during the summer time. Concerning the regional distribution, the number of individuals was numerous in the eastern and northern areas, but less abundant in the central, southern and western areas. Concerning the percentage occurrence of principal meiobenthos, in nematodes, Sabatiera was found abundantly in the entire Suo-nada, while, Desmodora appeared in large number in the eastern and Terschellingia in the western areas. In polychaetes, Prionospio cirrifera distributed abundantly from the central to the western areas, while Cossura coasta and Lumbrineris longifolia were numerous in northern and eastern areas. Harpacticoids a benthic copepod group, was collected abundantly from the entire area. 3. The relation between the individual number of meiobenthos and the depth of their distribution was then analysed. Although individual numbers of nematodes were few during summer and winter at depths between 20 and 40 meters, they increased the number in company with the increase of depth of water in other seasons. In polychaetes, the numbers were abundant in the water deeper than from 30 to 40 meters. On the contrary, the benthic copepods were noticed scarcely in water deeper than 30 to 40 meters. The investigation on the relation between the occurrence of meiobenthos and the mud-content of sediment revealed that nematodes became less abundant in company with the increase of mud content. The similar tendency was also observed in polychaetes excpt in spring. Benthic copepods were less abundant in sediments with mud-content from 50 to 75%, while they appeared abundantly in sediments with mud-content more than 75%. 4. Based on the quantity and the ranking of occurrence of three major meiobenthos (nematodes, polychaetes, and benthic copepods), the distibutional patterns of meiobenthos are divided into four types, viz. Polychaeta-Nematoda type, Nematoda-Polychaeta type, Polychaeta-Copepoda type, Copepoda-Polychaeta & Nematoda type. From the mean composition and biomass of these species, four types could then be arranged into two categories: Polychaeta-Nematoda group and Polychaeta-Copepoda group. The former group is seen in the coarse sandy-mud bottom of the eastern portion of Suho-nada, and characterized by two polychaete species Cossura coasta and Lumbrineris longifolia and two nematode genera Sabatiera and Desmodora. The latter group is seen in the fine mud bottom of the shallow western water and characterized by a polychaete species Prionospio cirrifera and two nematode genera Sabatiera and Terschellingia. The mean biomass of Polychaeta-Nematoda group was about 280 mg/m2 in wet weight, and the value of Polychaeta-Copepoda group was only about 120 mg. 5. Although the small-type trawl fishery in Suo-nada is carried out in the entire area, of Suo-nada, the fishing ground of demersal fish are mainly restricted to the eastern area characterized by Polychaeta-Nematoda group is essential. On the contrary, the demersal fishery is not active in the western area characterized by Polychaeta-Copepoda group. The catch of flat fish such as soles, finespotted flounder, Pleuronichtys cornutus, and marbled flounder, Limanda yokohamae, was good in the area characterized by the Polychaeta-Nematoda group, while it was less abundant in the area characterized by Polychaeta-Copepoda group. It is interesting to note that the amount of biomass of meiobenthos was fairly well correlated to the amount of catch of demersal fish in the water defined as the Polychaeta-Nematoda group. This tendency was especially remarkable in the catch of soles. On the other hand, no relation was observed between the biomass of meiobenthos and the catch of demersal fish in the water defined as the Polychaeta-Copepoda group. The results obtained through the present study indicate that the distributional pattern and the biomass of three major meiobenthos (nematodes, polychaetes and benthic copepods) in Suo-nada, Seto Inland Sea, have fairly close relationships to the localities of fishing grounds of flat fish and to the catch of important species such as soleina, finespotted and marbled flounders. | |||||
| 言語 | en | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 沿岸浅海域におけるメイオベントスは,最近になって底魚類や他の水産動物の餌として,また,底質環境の指標生物として注目され始めている。このようなメイオベントスを水産的な見地から,底質や底魚漁場での特性を見い出すために,メイオベントスの分布及び底魚類の漁獲量との関係を海域別,魚種別に検討した。その研究結果を要約すると次のとおりである。1. 周防灘におけるメイオペントスは、平均個体数が10×10cm2当り約800個体で,主として線虫類,多毛類,底生かい脚類によって構成されていた。これらメイオベントスの分布は,海底の表唇近くに多く,また,泥底に比して砂泥底により深く分布しており,底土表面から5cmの深さで出現個体数の80–90%を占めていた。2. メイオベントスの出現分布は,季節的には秋季に出現個体数が多く、夏季に少ない。また海域的には,周防灘の東部から北部に多く,中央部,南部,西部に少ない。メイオベントス主要種の出現割合では,線虫類は Sabatiera 属が全域に,Desmodora 属が東部に,Terschellingia 属が中央部から西部に優占している。多毛類は,Prionospio cirriferaが中央部から西部に,Cossura coasta, Lumbrineris longifolia が北部から東部に優占している。底生かい脚類は Harpacticoids が全域に優占していた。3. メイオベントスの出現分布と水深との関係は,線虫類では夏季と冬季に水深20-40m域で少ないが,他の季節では水深の増加に伴って多くなる。多毛類では,水深30-40m以深に出現個体数が多い。底生かい脚類では,水深30–40m域で少なく,その上下の水深域で多い。メイオベントスの出現分布と含泥率との関係は,線虫類ではどの季節においても,含泥率が高くなるに従って出現個体数が少なくなる。多毛類は春季を除き,含泥率が高くなるに従って少なくなる。底生かい脚類は各季節とも含泥率50-75%で少なく,75%以上で多い。4. メイオベソトス3類の現存量出現順位から周防灘のメイオベントス相は,多毛類一線虫類型,線虫類一多毛類型,多毛類一底生がい脚類型,底生かい脚類一多毛·線虫類型の4型に区分することができる。この4型は,さらに主要出現種の平均組成と平均現存量から多毛類一線虫類型グルーブと多毛類一底生かい脚類型グループの2つに類型化することができる。多毛類–線虫類型の海域は、周防灘の東側の底質の粗い砂泥底域に,多毛類一底生かい脚類 型の海域は,西側の水深が浅く,底質の細かい泥底域に位置している。また,多毛類一線虫類型海域における主な主要種は,多毛類では Cossura coasta, Lumbrineris lomgifolia が,線虫類ではSabatiera 属,Desmodora属が優占している。一方,多毛類一底生かい脚類型海域では,多毛類はPrionospio cirrifera が,線虫類は Sabatiera 属,Terschellingia 属が優占している。多毛類一線虫類型海域の平均現存量は,1m2当り約280mgと多く,多毛類一底生かい脚類型海域では約120mgと少ない。5. 周防灘における小型底びき網漁業は,周防灘全域を一様に利用しているが,底魚類の主な漁場の形成は,多毛類一線虫類型海域に多く、多毛類一底生かい脚類型海域に少ない。また底魚のうち異体類のウシノシタ類,メイタガレイ,マコガレイの漁獲量は,多毛類一線虫類型海域で多く,多毛類一底生かい脚類型海域で少ない。さらに多毛類一線虫類型海域ではメイオベントス現存量と漁獲量とがよく対応し,特にウシノシタ類,メイタガレイでは頭著である。これに反し,多毛類一底生かい脚類型海域では現存量と漁獲量との問に関連が認められない。これらのことから,メイオベントス3類の現存量出現順位による海域区分及び現存量は,ウシノシタ類,メイタガレイ,マコガレイなどの異体類の漁場と漁獲量に密接な関係のあることが明らかになった。 | |||||
| 言語 | ja | |||||
| bibliographic_information |
ja : 南西海区水産研究所研究報告 en : Bulletin of the Nansei Regional Fisheries Research Laboratory 巻 19, p. 53-85, ページ数 33, 発行日 1985-10 |
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| 出版者 | ||||||
| 出版者 | 南西海区水産研究所 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | Nansei Regional Fisheries Research Laboratory | |||||
| 言語 | en | |||||
| item_10002_source_id_9 | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0388-841X | |||||
| item_10002_source_id_11 | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00181988 | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | nnf_k_19_53 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010323091 | |||||
| 言語 | ja | |||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||
