說明
9793 Benthic marine invertebrate records sampled using a research demersal trawl net off the west and south coasts of South Africa during the years 2011 to 2022.
資料紀錄
此資源出現紀錄的資料已發佈為達爾文核心集檔案（DwC-A），其以一或多組資料表構成分享生物多樣性資料的標準格式。 核心資料表包含 9,793 筆紀錄。
此 IPT 存放資料以提供資料儲存庫服務。資料與資源的詮釋資料可由「下載」單元下載。「版本」表格列出此資源的其它公開版本，以便利追蹤其隨時間的變更。
版本
以下的表格只顯示可公開存取資源的已發布版本。
如何引用
研究者應依照以下指示引用此資源。:
Atkinson LJ SAEON Offshore invertebrate research trawl programme.
權利
研究者應尊重以下權利聲明。:
此資料的發布者及權利單位為 South African National Biodiversity Institute。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF 註冊
此資源已向GBIF註冊，並指定以下之GBIF UUID: ab1d732a-2b19-4faa-b927-b2e4eccaeaaf。 South African National Biodiversity Institute 發佈此資源，並經由South African Biodiversity Information Facility同意向GBIF註冊成為資料發佈者。
關鍵字
Porifera; Cnidaria; Annelida; Arthropoda; Bryozoa; Branchiopoda; Mollusca; Echinodermata; Chordata; Hemichordata. Demersal; offshore marine epifauna; Invertebrates; research Trawl.; Observation
聯絡資訊
- 元數據提供者 ●
- 出處 ●
- 連絡人
地理涵蓋範圍
West and South coasts of South Africa, extending from the border with Namibia at the Orange River Mouth to Port Alfred
| 界定座標範圍 | 緯度南界 經度西界 [-36.75, 14.6], 緯度北界 經度東界 [-28.75, 26.9] |
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分類群涵蓋範圍
All marine invertebrates that are retained in the research trawl net from each trawl deployed are identified and recorded. These surveys take place in collaboration with the annual demersal research surveys conducted by the Fisheries Department, currently under the Department of Forestry, Fisheries and Environment (DFFE).
| Genus | Psilaster |
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Total of 316 species belonging to 10 marine Phyla
| Genus | Haliporoides |
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時間涵蓋範圍
| 起始日期 / 結束日期 | 2011-01-05 / 2022-02-08 |
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取樣方法
Samples were collected using a research demersal trawl net towed for 30 minutes per trawl, unless hard ground was encountered or net was damaged in which case shorter tow durations are noted. Sampling unit is nautical miles squared.
| 研究範圍 | Demersal research trawl gear are used to collect invertebrates as bycatch during fish surveys. The trawl gear used is German Otter trawl with otter trawl boards and a footrope rope-wrapped chain. The mesh size of the codend liner was 40 mm stretched mesh. See Atkinson et al 2011 doi: 10.2989/1814232X.2011.572378 and Axelsen and Johnsen 2015 doi:10.1111/fog.12079 |
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| 品質控管 | Data were validated by engaging with experts where necessary and using various field guides. Coordinates of the start position of the trawl are provided and due to the depths at which the trawls operate and the uncertainty of where the vessel is in relation to the trawl net on the seafloor, no further useful co-ordinate uncertainty can be provided. |
方法步驟描述:
- N/A
額外的詮釋資料
Acknowledgement required by Egagasini Node, South African Environmental Observation Network.