説明
Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: From 4 to 13 August 1991, as part of a larger study, Alaska harbor porpoise (Phocoena phocoena) abundance was investigated during an aerial survey throughout the coastal waters of Bristol Bay. A Twin Otter was used as the survey platform. The surveys were flown at an altitude of 152.2 m (500 ft) and at an airspeed of 185 km/h. A single zigzag trackline was flown along the north side of Bristol Bay, and the first of three identical sawtooth tracklines was flown along the south side. Line-transect methodology was used, and only those observations made during optimal conditions were analyzed. Density of harbor porpoises was calculated using line transect estimates based on perpendicular distances of sightings to the cruise track of the airplane. On average, porpoise group size and density for Bristol Bay was 1.17 (SE = 0.35) and 4.48 groups/100 km2 (SE = 1.38). Purpose: Although harbor porpoises, Phocoena phocoena, are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal Laboratory initiated a 3 year study on Alaska harbor porpoises. The objectives of this program were to: 1) Obtain minimum population estimates in coastal waters using line transect methodology with a coefficient of variation for density estimates of less than 30% for each survey area, and 2) Establish a baseline for detecting changes in abundance through time, for analysis of trends. During the present study, it was not fiscally possible to survey all areas of the state in any one year. Accordingly, we selected sections of the state to survey in consecutive years to maximize the likelihood of including all of the animals for a particular area surveyed while minimizing the likelihood of significant movement between areas among survey years. Supplemental information: This dataset and associated effort data were updated on Sept 8, 2005. Those who downloaded them before that date should renew them.
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、38 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。:
Dahlheim, M., A. York, R. Towell, J. Waite, and J. Breiwick. 2000. Harbor porpoise (Phocoena phocoena) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993. Marine Mammal Science. 16(1): 28-45.
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: b3be552e-b48c-4f62-8ace-d53f5f85d65d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,Aircraft,Sightings,harbor porpoise,Phocoena phocoena,abundance,aerial survey,marine mammal survey,survey,marine mammal,cetacean; 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/128 UTF-8 Interactive map |
|---|---|
| FGDC Metadata | http://seamap.env.duke.edu/dataset/128/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
Alaska,Bristol Bay
| 座標（緯度経度） | 南 西 [55.465, -163.298], 北 東 [58.979, -158] |
|---|
生物分類学的範囲
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
| Order | Cetacea (cetaceans) |
|---|---|
| Species | Delphinapterus leucas (Beluga), Eschrichtius robustus (Gray Whale), Phocoena phocoena (Harbor Porpoise), Orcinus orca (Killer Whale), Balaenoptera acutorostrata (Minke Whale), Lagenorhynchus obliquidens (Pacific White-sided Dolphin) |
時間的範囲
| 開始日 / 終了日 | 1991-08-04 / 1991-08-13 |
|---|
プロジェクトデータ
説明がありません
| タイトル | NMML Harbor Porpoise Aerial Survey, Bristol Bay, Replicate 1, 1991 |
|---|---|
| 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
- データ所有者
収集方法
NA
| Study Extent | NA |
|---|
Method step description:
- NA
コレクションデータ
| コレクション名 | zd_128 |
|---|---|
| コレクション識別子 | zd_128 |
| Parent Collection Identifier | OBIS-SEAMAP |
追加のメタデータ
marine, harvested by iOBIS
| 目的 | Although harbor porpoises, Phocoena phocoena, are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal Laboratory initiated a 3 year study on Alaska harbor porpoises. The objectives of this program were to: 1) Obtain minimum population estimates in coastal waters using line transect methodology with a coefficient of variation for density estimates of less than 30% for each survey area, and 2) Establish a baseline for detecting changes in abundance through time, for analysis of trends. During the present study, it was not fiscally possible to survey all areas of the state in any one year. Accordingly, we selected sections of the state to survey in consecutive years to maximize the likelihood of including all of the animals for a particular area surveyed while minimizing the likelihood of significant movement between areas among survey years. |
|---|---|
| 代替識別子 | http://ipt.env.duke.edu/resource?r=zd_128 |