Descripción
Pasua (Tridacna maxima), also known as pa’ua, are one of two species of giant clams native to the Cook Islands. Pasua are a culturally significant food item throughout the Cook Islands, and in the Northern Cooks remain a staple food source. Pasua are rare in the southern Cook Islands as a consequence of previous overharvesting but increasing numbers of pasua from the northern Cook Islands, especially Tongareva, are available for sale in Rarotonga. In response to declining numbers in the southern Cook Islands, a giant clam hatchery was established on Aitutaki in 1990 by the Cook Islands Ministry of Marine Resources (MMR) to help reintroduce clams to the lagoon.
The specific aims of the survey were to assess the size distribution, abundance and density of pasua in Tongareva Lagoon.
In addition, this survey aimed to provide baseline information for the Island Council regarding the establishment of specific size limits, the possible need for a rahui (harvest closure), and the ideal location of such a rahui if required.
Registros
Los datos en este recurso de evento de muestreo han sido publicados como Archivo Darwin Core(DwC-A), el cual es un formato estándar para compartir datos de biodiversidad como un conjunto de una o más tablas de datos. La tabla de datos del core contiene 27 registros.
también existen 2 tablas de datos de extensiones. Un registro en una extensión provee información adicional sobre un registro en el core. El número de registros en cada tabla de datos de la extensión se ilustra a continuación.
Este IPT archiva los datos y, por lo tanto, sirve como repositorio de datos. Los datos y los metadatos del recurso están disponibles para su descarga en la sección descargas. La tabla versiones enumera otras versiones del recurso que se han puesto a disposición del público y permite seguir los cambios realizados en el recurso a lo largo del tiempo.
Versiones
La siguiente tabla muestra sólo las versiones publicadas del recurso que son de acceso público.
¿Cómo referenciar?
Los usuarios deben citar este trabajo de la siguiente manera:
Chambers C N (2024). Pasua (Tridacna maxima) size and abundance in Tongareva Lagoon, Cook Islands. Version 1.0. Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. Samplingevent dataset. https://nzobisipt.niwa.co.nz/resource?r=tongareva_clams&v=1.0
Derechos
Los usuarios deben respetar los siguientes derechos de uso:
El publicador y propietario de los derechos de este trabajo es Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. Esta obra está bajo una licencia Creative Commons de Atribución/Reconocimiento (CC-BY 4.0).
Registro GBIF
Este recurso ha sido registrado en GBIF con el siguiente UUID: 27b24738-02ef-4c81-b470-bfe639cd0c37. Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node publica este recurso y está registrado en GBIF como un publicador de datos avalado por Ocean Biodiversity Information System.
Palabras clave
Samplingevent
Contactos
- Proveedor De Los Metadatos ●
- Originador ●
- Punto De Contacto
Cobertura geográfica
Tongareva Lagoon, Cook Islands
| Coordenadas límite | Latitud Mínima Longitud Mínima [-9,04, -158,01], Latitud Máxima Longitud Máxima [-8,98, -157,92] |
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Cobertura taxonómica
Pasua giant clams
| Especie | Tridacna maxima (Pasua) |
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Cobertura temporal
| Fecha Inicial / Fecha Final | 2006-05-03 / 2006-05-24 |
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Métodos de muestreo
The survey took place over 14 days from 3–17 May 2006 with a follow-up survey at sites Te Vo, Tepetepe and between Ahuamiria and Atutahi on 24 July 2006. Fieldwork was conducted by the author, Mataora Marsters and Taimana Manata from the Tongareva Marine Research Centre (TMRC) with additional assistance from Tomas Samuela Jr., Tuku Marsters, Martin Chambers and Baar Tapu. Site selection was designed in an attempt to survey a wide cross section of the lagoon environment, for example toka (distinct coral heads), tuarai (small scattered coral heads close to shore) and kauniho (reef edges). Sites were stratified according to the section of the lagoon (e.g. far southern section) and were selected by travelling in a boat within these sections in a relatively straight line (e.g. parallel to the shore) for a set period of time (e.g. 10 minutes) until suitable habitat was encountered. From preliminary observations and based on existing biological information concerning pasua (Lewis 1987), suitable habitat was defined as toka and tuarai down to a depth of 10 metres, and kauniho, which weren’t predominately sandy.
| Área de Estudio | Tongareva Lagoon, Cook Islands |
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Descripción de la metodología paso a paso:
- The survey area was delineated by four 50-m ropes, which were knotted to form a square. This was then placed randomly over the survey site although in the case of kauniho, the lines were placed at the edge of the kauniho extending towards the shoreline. Five transect lines were then placed within the square at 10-m intervals. All pasua found within 5 m on each side of the transect line were counted and a proportion of the total population measured. In cases where low numbers of pasua were present, every second pasua was measured but in situations where large numbers were found, measurements varied from every tenth to every one-hundreth pasua.
- The size distribution of pasua was evaluated by recording the length, measured in centimetres, along the shell opening (lip) using callipers. The census of pasua abundance in the lagoon was calculated by counting the number of pasua within each survey area; density was calculated as the total.
Referencias bibliográficas
- Chambers, C. 2007. Pasua (Tridacna maxima) size and abundance in Tongareva Lagoon, Cook Islands. SPC Trochus Information Bulletin #13 – July 2007, pg. 7-12.
Metadatos adicionales
marine, harvested by iOBIS
| Identificadores alternativos | https://nzobisipt.niwa.co.nz/resource?r=tongareva_clams |
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