Descrição
Original provider: Blue Whale Study Inc. Dataset credits: Blue Whale Study Inc. Abstract: Wind-forced cold water upwelling occurs seasonally along the continental shelf of south-east Australia, where pygmy blue whales aggregate to forage. Seasonality and variability are apparent for both blue whale encounter rates and upwelling, within and between seasons. Here we quantify upwelling variability over 11 seasons (2001/02 to 2011/12) and relate it to blue whale encounter rates. Two indices, cumulative wind stress (Intensity) quantifying physical forcing, and surface chlorophyll-a (chl-a) quantifying the ocean’s biological response, revealed variability in upwelling at a variety of temporal scales. Within seasons, upwelling Intensity peaked during February, and chl-a during February–March. Blue whale encounter rate from 52 aerial surveys was modelled against upwelling indices and the climate signal SAM (Southern Annular Mode), at individual survey- and aggregated season-levels, using General Additive Models (GAMs). Survey-level GAMs showed that encounter rate increased with increasing chl-a, and with increasing upwelling Intensity to a point beyond which further increases in Intensity resulted in declining encounter rates. This indicated the importance of productivity, as well as relaxation of upwelling, in producing optimal blue whale foraging conditions. In exploratory season-level models, a strong influence of SAM was apparent, with higher encounter rates associated with positive SAM during the preceding 12 months. Including chl-a improved the model, indicating that both broad-scale climatic signals inherently incorporating environmental variability and uncertainty, as well as more proximal regional factors may influence blue whale occurrence in the study area. Measuring the complex relationships between whale occurrence and upwelling is complicated by the fact that the population of blue whales using the Bonney Upwelling is open, and moves between alternate foraging areas. The findings were interpreted in the context of blue whale foraging ecology in this system. Purpose: Relate variability in blue whale relative abundance to variability in upwelling off southern Australia
Registros de Dados
Os dados deste recurso de ocorrência foram publicados como um Darwin Core Archive (DwC-A), que é o formato padronizado para compartilhamento de dados de biodiversidade como um conjunto de uma ou mais tabelas de dados. A tabela de dados do núcleo contém 87 registros.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
Versões
A tabela abaixo mostra apenas versões de recursos que são publicamente acessíveis.
Como citar
Pesquisadores deveriam citar esta obra da seguinte maneira:
Gill, P. 2015. Blue Whale Study aerial surveys, southern Australia, 2007-2012. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/1281) on yyyy-mm-dd.
Direitos
Pesquisadores devem respeitar a seguinte declaração de direitos:
O editor e o detentor dos direitos deste trabalho é OBIS-SEAMAP. This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF Registration
Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: 424d81c1-d67a-4791-8a89-f445b9569abe. OBIS-SEAMAP publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por Ocean Biodiversity Information System.
Palavras-chave
Occurrence,Marine Animal Survey,Marine Biology,Marine mammals,Visual Sighting,Aircraft; Observation; Occurrence
Dados externos
Os dados de recurso também estão disponíveis em outros formatos
| OBIS-SEAMAP Dataset Page | http://seamap.env.duke.edu/dataset/1281 UTF-8 Interactive map |
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| FGDC Metadata | http://seamap.env.duke.edu/dataset/1281/xml UTF-8 XML |
Contatos
- Proprietário ●
- Originador ●
- Ponto De Contato
- Provedor Dos Metadados ●
- Distribuidor
Cobertura Geográfica
Australia
| Coordenadas delimitadoras | Sul Oeste [-39,41, 139,52], Norte Leste [-37,531, 143,364] |
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Cobertura Taxonômica
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
| Subespécie | Balaenoptera musculus brevicauda (Pygmy blue whale) |
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Cobertura Temporal
| Data Inicial / Data final | 2007-11-09 / 2012-03-28 |
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Dados Sobre o Projeto
Nenhuma descrição disponível
| Título | Blue Whale Study aerial surveys, southern Australia, 2007-2012 |
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| Financiamento | NA |
O pessoal envolvido no projeto:
- Proprietário
Métodos de Amostragem
NA
| Área de Estudo | NA |
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Descrição dos passos do método:
- NA
Dados de Coleção
| Nome da Coleção | zd_1281 |
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| Identificador da Coleção | zd_1281 |
| Identificador da Coleção Parental | OBIS-SEAMAP |
Metadados Adicionais
marine, harvested by iOBIS
| Propósito | Relate variability in blue whale relative abundance to variability in upwelling off southern Australia |
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| Identificadores alternativos | http://ipt.env.duke.edu/resource?r=zd_1281 |