説明
Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: Visual line-transect surveys for cetaceans were conducted in the southeastern Bering Sea (SEBS) from 10 June to 3 July 2000, in association with a pollock stock assessment survey aboard the NOAA ship Miller Freeman. Observers scanned for cetaceans with 25x (Big Eye) binoculars from the flying bridge (platform height = 12 m) at survey speeds of 18.5-22 km h-1 (10-12 knots). Transect survey effort was 2,194 km in 2000, in a study area 158,561 km2. An additional 402 km of trackline was surveyed in 2000 while in transit to or from pollock survey way points. Fin whales (Balaenoptera physalus) were the most common large whale, and Dall's porpoises (Phocoenoides dalli) were the most common small cetacean. In the SEBS 2000, uncorrected abundance estimates were: 683 (CV = 0.32) fin whales, 102 (CV = 0.50) humpback whales (Megaptera novaeangliae), 1,003 (CV = 0.26) minke whales, 9,807 (CV = 0.20) Dall's porpoise, and 1,958 (CV = 0.21) harbor porpoise. Non-pollock echosigns observed near cetaceans, some of which may have been cetacean prey, were not routinely identified during trawl sampling because the research focus was on pollock abundance assessment. Clearly, additional surveys and concomitant assessment of cetacean prey are needed to better define their role in the Bering Sea ecosystem. Such surveys, combined with measures of local hydrography and prey field should be the goal of future cetacean assessments. Purpose: Cetacean distribution and abundance in the Bering Sea is poorly described, with even recent reviews of cetaceans' role in the ecosystem reliant on data from the commercial whaling era. Commercial harvests of baleen whales (mysticetes) were extensive in the North Pacific and Bering Sea, especially between 1835 and 1850 for North Pacific right whales and between 1965 and 1979 for fin and humpback whales. The effect of these large-scale removals on the marine ecosystem is largely unknown. Similarly, some species of toothed whales (odontocetes) are sometimes killed in the course of commercial fishing operations. Pelagic dolphins and Dall's porpoise were especially vulnerable during high seas driftnet fishing in the North Pacific in the 1980s, and once again the long-term ramifications of these removals are unknown. One reason for this uncertainty is the lack of data on current cetacean distribution and estimates of abundance in pelagic environments. Surveys to determine distribution and abundance are costly and, therefore, often confined either to coastal waters where the logistics are most practical, or to areas of the ocean where marine mammal mortality associated with commercial fishing is particularly high. The pelagic waters of the Bering Sea have not met either criteria and so are comparatively undersampled for cetaceans. Cruises were undertaken in association with the Alaska Fisheries Science Center/Resource Assessment and Conservation Engineering (AFSC/RACE) division to conduct visual surveys for cetaceans during the semi-annual acoustic trawl surveys for walleye pollock (Theragra chalcogramma) on the Bering Sea shelf. Biologists from the AFSC/National Marine Mammal Laboratory (NMML) were able to join subsequent surveys in the southeastern Bering Sea (SEBS) in 2000, providing an opportunity to describe cetacean distribution and calculate abundance over a broad area of the Bering Sea shelf.
データ レコード
この オカレンス(観察データと標本) リソース内のデータは、1 つまたは複数のデータ テーブルとして生物多様性データを共有するための標準化された形式であるダーウィン コア アーカイブ (DwC-A) として公開されています。 コア データ テーブルには、428 レコードが含まれています。
この IPT はデータをアーカイブし、データ リポジトリとして機能します。データとリソースのメタデータは、 ダウンロード セクションからダウンロードできます。 バージョン テーブルから公開可能な他のバージョンを閲覧でき、リソースに加えられた変更を知ることができます。
バージョン
次の表は、公にアクセス可能な公開バージョンのリソースのみ表示しています。
引用方法
研究者はこの研究内容を以下のように引用する必要があります。:
Waite, J. 2006. NMML Bering Sea Cetacean Survey 2000. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/122) on yyyy-mm-dd.
権利
研究者は権利に関する下記ステートメントを尊重する必要があります。:
パブリッシャーとライセンス保持者権利者は OBIS-SEAMAP。 This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.
GBIF登録
このリソースをはGBIF と登録されており GBIF UUID: eae32224-05a2-4e3c-90f8-77b1d22a850cが割り当てられています。 Ocean Biodiversity Information System によって承認されたデータ パブリッシャーとして GBIF に登録されているOBIS-SEAMAP が、このリソースをパブリッシュしました。
キーワード
Occurrence,survey,cetacean,walleye pollock,trawl. acoustic,Vessels,Sightings; Observation; Occurrence
外部データ
リソース データは他の形式で入手可能です。
OBIS-SEAMAP Dataset Page | http://seamap.env.duke.edu/dataset/122 UTF-8 Interactive map |
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FGDC Metadata | http://seamap.env.duke.edu/dataset/122/xml UTF-8 XML |
連絡先
- メタデータ提供者 ●
- データ配布者
地理的範囲
southeastern Bering Sea,Bering Sea,Alaska
座標(緯度経度) | 南 西 [54.187, -170.296], 北 東 [58.592, -154.979] |
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生物分類学的範囲
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
Order | Cetacea (cetaceans), Cetacea (cetaceans), Cetacea (cetaceans), Cetacea (cetaceans) |
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Suborder | Caniformia (pinnipeds) |
Genus | Mesoplodon (beaked whales) |
Species | Balaenoptera acutorostrata (Minke Whale), Balaenoptera borealis (Sei Whale), Berardius bairdii (Baird's Beaked Whale), Balaenoptera physalus (Fin Whale), Callorhinus ursinus (Northern Fur Seal), Eumetopias jubatus (Steller Sea Lion), Enhydra lutris (Sea Otter), Eschrichtius robustus (Gray Whale), Lagenorhynchus obliquidens (Pacific White-sided Dolphin), Megaptera novaeangliae (Humpback Whale), Orcinus orca (Killer Whale), Odobenus rosmarus (Walrus), Phocoenoides dalli (Dall's Porpoise), Phocoena phocoena (Harbor Porpoise), Phoca vitulina (Harbor Seal) |
時間的範囲
開始日 / 終了日 | 2000-06-10 / 2000-07-02 |
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プロジェクトデータ
説明がありません
タイトル | NMML Bering Sea Cetacean Survey 2000 |
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ファンデイング | NA |
プロジェクトに携わる要員:
- データ所有者
収集方法
NA
Study Extent | NA |
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Method step description:
- NA
コレクションデータ
コレクション名 | zd_122 |
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コレクション識別子 | zd_122 |
Parent Collection Identifier | OBIS-SEAMAP |
追加のメタデータ
marine, harvested by iOBIS
目的 | Cetacean distribution and abundance in the Bering Sea is poorly described, with even recent reviews of cetaceans' role in the ecosystem reliant on data from the commercial whaling era. Commercial harvests of baleen whales (mysticetes) were extensive in the North Pacific and Bering Sea, especially between 1835 and 1850 for North Pacific right whales and between 1965 and 1979 for fin and humpback whales. The effect of these large-scale removals on the marine ecosystem is largely unknown. Similarly, some species of toothed whales (odontocetes) are sometimes killed in the course of commercial fishing operations. Pelagic dolphins and Dall's porpoise were especially vulnerable during high seas driftnet fishing in the North Pacific in the 1980s, and once again the long-term ramifications of these removals are unknown. One reason for this uncertainty is the lack of data on current cetacean distribution and estimates of abundance in pelagic environments. Surveys to determine distribution and abundance are costly and, therefore, often confined either to coastal waters where the logistics are most practical, or to areas of the ocean where marine mammal mortality associated with commercial fishing is particularly high. The pelagic waters of the Bering Sea have not met either criteria and so are comparatively undersampled for cetaceans. Cruises were undertaken in association with the Alaska Fisheries Science Center/Resource Assessment and Conservation Engineering (AFSC/RACE) division to conduct visual surveys for cetaceans during the semi-annual acoustic trawl surveys for walleye pollock (Theragra chalcogramma) on the Bering Sea shelf. Biologists from the AFSC/National Marine Mammal Laboratory (NMML) were able to join subsequent surveys in the southeastern Bering Sea (SEBS) in 2000, providing an opportunity to describe cetacean distribution and calculate abundance over a broad area of the Bering Sea shelf. |
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代替識別子 | http://ipt.env.duke.edu/resource?r=zd_122 |