説明
Original provider:
Blue Whale Study Inc.
Dataset credits:
Blue Whale Study Inc.
Abstract:
Blue whales Balaenoptera musculus aggregate to feed in a regional upwelling system during November–May between the Great Australian Bight (GAB) and Bass Strait. We analyzed sightings from aerial surveys over 6 upwelling seasons (2001–02 to 2006–07) to assess within-season patterns of blue whale habitat selection, distribution, and relative abundance. Habitat variables were modelled using a general linear model (GLM) that ranked sea surface temperature (SST) and sea
surface chlorophyll (SSC) of equal importance, followed by depth, distance to shore, SSC gradient, distance to shelf break, and SST gradient. Further discrimination by hierarchical partitioning indicated that SST accounted for 84.4% of variation in blue whale presence explained by the model, and
that probability of sightings increased with increasing SST. The large study area was resolved into 3 zones showing diversity of habitat from the shallow narrow shelf and associated surface upwelling of the central zone, to the relatively deep upper slope waters, broad shelf and variable upwelling of
the western zone, and the intermediate features of the eastern zone. Density kernel estimation showed a trend in distribution from the west during November–December, spreading south-eastward along the shelf throughout the central and eastern zones during January–April, with the central zone most consistently utilized. Encounter rates in central and eastern zones peaked in February, coinciding with peak upwelling intensity and primary productivity. Blue whales avoided inshore upwelling centers, selecting SST ~1°C cooler than remotely sensed ambient SST. Whales selected
significantly higher SSC in the central and eastern zones than the western zone, where relative abundance was extremely variable. Most animals departed from the feeding ground by late April.
Purpose:
A primary objective of the present study was to use modelling (i.e., general linear model [GLM]) to assess the relative importance of a range of biophysical habitat variables in explaining whale distribution (see
Redfern et al. 2006 for a review of cetacean habitat modelling). To do this we used blue whale sighting data from aerial surveys over 6 upwelling seasons, in combination with bathymetric, remote sensing, and temperature logger data. Another objective was to explain within-season patterns of distribution and
relative abundance of foraging blue whales in this upwelling system using density kernel estimation and monthly variabililty in encounter rates. Furthermore, the present study presented an opportunity to assess whether the Bonney Upwelling surface plume, representing a shoaling of the thermocline rarely observed in blue whale feeding grounds elsewhere, provided insights into relationships between whales and upwelling in this region.
Reference: Redfern, J.V., M.C. Ferguson, E.A. Becker, K.D. Hyrenbach et al. 2006. Techniques for cetacean-habitat modelling.
Marine Ecological Progress Series 310:271–295.
Supplemental information:
[2015-06-04] The identification of the species is updated from Balaenoptera musculus to Balaenoptera musculus brevicauda.
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、408 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。:
Gill, P. 2015. Blue Whale Study aerial surveys, southern Australia 2002-2007. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/971) 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: e38a459a-06c4-4056-8f2c-4f0d2fc38605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,pygmy blue whales; 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/971 UTF-8 Interactive map |
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FGDC Metadata | http://seamap.env.duke.edu/dataset/971/xml UTF-8 XML |
連絡先
- データ所有者 ●
- 最初のデータ採集者 ●
- 連絡先
- メタデータ提供者 ●
- データ配布者
地理的範囲
Australia
座標(緯度経度) | 南 西 [-39.383, 134.058], 北 東 [-35.053, 143.303] |
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生物分類学的範囲
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
Subspecies | Balaenoptera musculus brevicauda (Pygmy blue whale) |
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時間的範囲
開始日 / 終了日 | 2002-01-19 / 2007-05-16 |
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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 | Blue Whale Study aerial surveys, southern Australia 2002-2007 |
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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_971 |
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コレクション識別子 | zd_971 |
Parent Collection Identifier | OBIS-SEAMAP |
追加のメタデータ
marine, harvested by iOBIS
目的 | A primary objective of the present study was to use modelling (i.e., general linear model [GLM]) to assess the relative importance of a range of biophysical habitat variables in explaining whale distribution (see
Redfern et al. 2006 for a review of cetacean habitat modelling). To do this we used blue whale sighting data from aerial surveys over 6 upwelling seasons, in combination with bathymetric, remote sensing, and temperature logger data. Another objective was to explain within-season patterns of distribution and
relative abundance of foraging blue whales in this upwelling system using density kernel estimation and monthly variabililty in encounter rates. Furthermore, the present study presented an opportunity to assess whether the Bonney Upwelling surface plume, representing a shoaling of the thermocline rarely observed in blue whale feeding grounds elsewhere, provided insights into relationships between whales and upwelling in this region. Reference: Redfern, J.V., M.C. Ferguson, E.A. Becker, K.D. Hyrenbach et al. 2006. Techniques for cetacean-habitat modelling. Marine Ecological Progress Series 310:271–295. |
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代替識別子 | http://ipt.env.duke.edu/resource?r=zd_971 |