說明
Original provider: Giuseppe Notarbartolo di Sciara, Tethys Research Institute Dataset credits: Tethys Research Institute Abstract: The giant devil ray Mobula mobular, the only Mediterranean mobulid, is subject to mortality caused by directed and accidental captures in fisheries throughout the region. Whilst the combination of human impacts, limited range and a low reproductive potential is not inconsistent with its endangered listing, there are insufficient data to enable a quantitative assessment of trends. Without this, it is difficult to assess and prioritise threats and develop effective conservation actions. Using results from aerial surveys conducted between 2009 and 2014 over the Ligurian, Corsican, Sardinian, northern and central Tyrrhenian seas (626,228 km2), this study provides the first quantitative information on giant devil ray abundance and habitat choice in the western Mediterranean. Devil rays were observed in all seasons except winter, with their estimated abundance in the study area peaking in summer. The overall uncorrected mean density in the study area during summer was estimated at 0.0257 individuals km-2 (range: 0.017–0.044), resulting in a total abundance estimate of 6,092 (12.7%CV) individuals at the surface; once corrected for availability bias, this estimate indicates a summer presence of >12,700 devil rays in the study area. Rays were mostly observed alone even if occasionally, larger aggregations up to a maximum of 18 individuals were observed. Although observed throughout the study area, spatial modelling identified their preferred habitat to be over a broad strip connecting the Tuscan Archipelago to Eastern Sardinia, over a wide range of water depths ranging from 10 to 2000m. The observed seasonal changes in giant devil ray distribution in this study, combined with similar evidence from other areas in the Mediterranean, support the hypothesis that the species undertakes latitudinal migrations across the region, taking advantage of highly productive waters in the north during summer, and warmer southern waters during winter. Supplemental information: Some records do not have time part.
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 298 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。:
Notarbartolo di Sciara, G. 2016. Giant Devil Rays in the North-Western Mediterranean Sea. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/1370) on yyyy-mm-dd.
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 OBIS-SEAMAP。 This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.
GBIF 註冊
此資源已向GBIF註冊,並指定以下之GBIF UUID: c9b33318-2033-4f94-afcf-e88ba2ddb272。 OBIS-SEAMAP 發佈此資源,並經由Ocean Biodiversity Information System同意向GBIF註冊成為資料發佈者。
關鍵字
Occurrence,Marine Animal Survey,Marine Biology,Visual Sighting,Aircraft; Observation; Occurrence
外部資料
此資源尚有其他格式可用
OBIS-SEAMAP Dataset Page | http://seamap.env.duke.edu/dataset/1370 UTF-8 Interactive map |
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FGDC Metadata | http://seamap.env.duke.edu/dataset/1370/xml UTF-8 XML |
聯絡資訊
- 元數據提供者 ●
- 散布者
地理涵蓋範圍
Mediterranean Sea
界定座標範圍 | 緯度南界 經度西界 [36.266, 5.854], 緯度北界 經度東界 [44.301, 19.001] |
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分類群涵蓋範圍
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
Species | Mobula mobular (giant devil ray) |
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時間涵蓋範圍
起始日期 / 結束日期 | 2009-07-21 / 2013-08-07 |
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計畫資料
無相關描述
計畫名稱 | Giant Devil Rays in the North-Western Mediterranean Sea |
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經費來源 | NA |
參與計畫的人員:
- 擁有者
取樣方法
NA
研究範圍 | NA |
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方法步驟描述:
- NA
收藏資料
蒐藏名稱 | zd_1370 |
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蒐藏編號 | zd_1370 |
上層採集品識別碼 | OBIS-SEAMAP |
額外的詮釋資料
marine, harvested by iOBIS
目的 | Not available |
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替代的識別碼 | http://ipt.env.duke.edu/resource?r=zd_1370 |