Recent (post-1930) changes in the extent of subtidal seagrass (Zostera muelleri) beds of the eastern Bay of Islands, New Zealand

Occurrence Observation
Versão mais recente published by Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node on jan. 17, 2024 Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node
Publication date:
17 de janeiro de 2024
Licença:
CC-BY 4.0

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Descrição

The surface areas of 12 subtidal seagrass Zostera muelleri beds at the islands and adjacent mainland shores of the eastern Bay of Islands (35° 12′ S, 174° 10′ E), New Zealand were estimated from aerial images. It appears that little subtidal seagrass existed until after the early-1950s, so significant beds here may be a relatively recent biome. Possible explanations for recent emergence of subtidal seagrass include that debilitating periods of turbid water and pulses of sedimentation associated with the land clearances of the late 1800s had worked through the marine ecosystem. An overall peak in seagrass-cover in the 1960s to 1980s was followed by declines in several beds in the 1990s to 2000s, with recovery since. The temporal presence of seagrass was well-correlated among the three mainland beds, and moderately well among the south-facing beds on the islands, consistent with mechanisms driving seagrass establishment and persistence operating at reasonably broad scales.

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 243 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:

Booth J (2024). Recent (post-1930) changes in the extent of subtidal seagrass (Zostera muelleri) beds of the eastern Bay of Islands, New Zealand. Version 1.4. Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. Occurrence dataset. https://nzobisipt.niwa.co.nz/resource?r=zostrea_boi_nz&v=1.4

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 foi registrado no GBIF e atribuído ao seguinte GBIF UUID: a8786b61-49b6-4d45-afc1-4d50bc434e50.  Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por Ocean Biodiversity Information System.

Palavras-chave

Occurrence; Observation

Contatos

John Booth
  • Provedor Dos Metadados ●
  • Originador ●
  • Ponto De Contato
  • Researcher
Independant Scholar
NZ
Kevin Mackay
  • Usuário

Cobertura Geográfica

Bay of Islands, New Zealand

Coordenadas delimitadoras Sul Oeste [-35,236, 174,161], Norte Leste [-35,212, 174,262]

Cobertura Taxonômica

Seagrass

Espécie Zostrea muelleri (Seagrass)

Cobertura Temporal

Data Inicial / Data final 1935-01-01 / 2017-12-31

Métodos de Amostragem

Interpretation from aerial photography

Área de Estudo Bay of Islands, New Zealand

Descrição dos passos do método:

  1. Aerial images useful in defining the extent of the main subtidal seagrass beds over time were scanned/downloaded, with particular focus on early (pre-satellite) ones. The aim was to acquire a time-series, with at least one image every decade through to the present, that could be used to identify any large-scale (on the order of ≥20%) changes in the seagrass footprint. High-resolution imagery spanning multiple beds was particularly useful because such depictions typically included well-established beds that provided reference for smaller and less well-known ones. Images taken at intervals shorter than a decade – even those separated by a year – were also useful because they could potentially indicate how much the surface manifestation of the seagrass beds changed over short timeframes. (Although plant-condition is important in the dynamics of seagrass, this is not readily assessed from aerial imagery. As it turned out, almost all images were from spring and summer, when this seagrass is typically most lush.

Citações bibliográficas

  1. Booth, J.D., 2019. Recent (post-1930) changes in the extent of subtidal seagrass (Zostera muelleri) beds of the eastern Bay of Islands, New Zealand. New Zealand Journal of Marine and Freshwater Research, 53(1), pp.113-127. https://doi.org/10.1080/00288330.2018.1513409

Metadados Adicionais

marine, harvested by iOBIS

Identificadores alternativos a8786b61-49b6-4d45-afc1-4d50bc434e50
https://nzobisipt.niwa.co.nz/resource?r=zostrea_boi_nz