Southern right whales wintering in the Auckland Islands, 1995-1998

Versão mais recente publicado por Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node em Dec 29, 2019 Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node

Historically, southern right whales were widely distributed in New Zealand waters. This population, was driven to commercial extinction following extensive exploitation during the early 19th century (Dawbin 1986). It was further depleted by illegal Soviet hunting in 1950-1970 (Tormosov et al. 1998). While right whale sightings around mainland New Zealand remain rare, up to 165 whales can be found at the Auckland Is in a single day during winter. Despite what appears to be adequate habitat along the eastern coastline, the whales' distribution is largely limited to Port Ross, Laurie Harbour and waters around Enderby I. The relatively small area where so many whales congregate means that at peak season the density of whales at the Auckland Is is very high (approximately 8 whales/km2). The residency period extends from at least early May to at least the end of September, with peak numbers in July and August.

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 546 registros.

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Versões

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Como citar

Pesquisadores deveriam citar esta obra da seguinte maneira:

Patenaude N (2019): Southern right whales wintering in the Auckland Islands, 1995-1998. v1.0. Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. Dataset/Occurrence. https://nzobisipt.niwa.co.nz/resource?r=southernrightwhales_auck&v=1.0

Direitos

Pesquisadores devem respeitar a seguinte declaração de direitos:

O editor e o detentor dos direitos deste trabalho é Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.

GBIF Registration

Este recurso não foi registrado pelo GBIF

Palavras-chave

Occurrence

Contatos

Quem criou esse recurso:

Nathalie Patenaude
Researcher
School of Biological Sciences, University of Auckland Auckland NZ

Quem pode responder a perguntas sobre o recurso:

Nathalie Patenaude
Researcher
School of Biological Sciences, University of Auckland Auckland NZ

Quem preencher os metadados:

Nathalie Patenaude
Researcher
School of Biological Sciences, University of Auckland Auckland NZ

Cobertura Geográfica

Auckland Islands

Coordenadas delimitadoras Sul Oeste [-50.611, 166.124], Norte Leste [-50.456, 166.385]

Cobertura Taxonômica

Southern right whale

Espécie  Eubalaena australis

Cobertura Temporal

Data Inicial / Data final 1995-08-01 / 1998-08-31

Métodos de Amostragem

In order to determine the minimum number of southern right whales visiting the Auckland Is each winter, combined non-systematic small boat and shore-based surveys of right whales were conducted within Port Ross and surrounding areas. The boat surveys were conducted along the centre-line of the harbour, and visibility (during most surveys) allowed scanning to the extent of both coastlines. Simultaneously, other observers conducted shore-based counts from several elevated vantage points on Enderby and Auckland Is.

Área de Estudo Port Ross, Laurie Harbour and waters around Enderby Island, Auckland Islands, New Zealand

Descrição dos passos do método:

  1. During these surveys, a sighting was considered to include only one individual unless more than one individual could be counted at the surface within one and a half whale body lengths. Thus these censuses represent a minimum estimate of the number of whales observed on each occasion
  2. For all observations, an animal was judged to be a calf when the portion visible at the surface was less than half of the length of an accompanying adult. The accompanying adult was assumed to be the cow.

Citações bibliográficas

  1. Patenaude, NJ., 2000. Southern right whales wintering in the Auckland Islands. Conservation Advisory Science Notes No. 321, Department of Conservation, Wellington. https://www.doc.govt.nz/globalassets/documents/science-and-technical/casn321.pdf

Metadados Adicionais

marine, harvested by iOBIS

Identificadores alternativos https://nzobisipt.niwa.co.nz/resource?r=southernrightwhales_auck