說明
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.
資料紀錄
此資源sampling event的資料已發佈為達爾文核心集檔案（DwC-A），其以一或多組資料表構成分享生物多樣性資料的標準格式。 核心資料表包含 27 筆紀錄。
亦存在 2 筆延伸集的資料表。延伸集中的紀錄補充核心集中紀錄的額外資訊。 每個延伸集資料表中資料筆數顯示如下。
此 IPT 存放資料以提供資料儲存庫服務。資料與資源的詮釋資料可由「下載」單元下載。「版本」表格列出此資源的其它公開版本，以便利追蹤其隨時間的變更。
版本
以下的表格只顯示可公開存取資源的已發布版本。
如何引用
研究者應依照以下指示引用此資源。:
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
權利
研究者應尊重以下權利聲明。:
此資料的發布者及權利單位為 Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node。 This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF 註冊
此資源已向GBIF註冊，並指定以下之GBIF UUID: 27b24738-02ef-4c81-b470-bfe639cd0c37。 Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node 發佈此資源，並經由Ocean Biodiversity Information System同意向GBIF註冊成為資料發佈者。
關鍵字
Samplingevent
聯絡資訊
- 元數據提供者 ●
- 出處 ●
- 連絡人
地理涵蓋範圍
Tongareva Lagoon, Cook Islands
| 界定座標範圍 | 緯度南界 經度西界 [-9.04, -158.01], 緯度北界 經度東界 [-8.98, -157.92] |
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分類群涵蓋範圍
Pasua giant clams
| Species | Tridacna maxima (Pasua) |
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時間涵蓋範圍
| 起始日期 / 結束日期 | 2006-05-03 / 2006-05-24 |
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取樣方法
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.
| 研究範圍 | Tongareva Lagoon, Cook Islands |
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方法步驟描述:
- 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.
引用文獻
- Chambers, C. 2007. Pasua (Tridacna maxima) size and abundance in Tongareva Lagoon, Cook Islands. SPC Trochus Information Bulletin #13 – July 2007, pg. 7-12.
額外的詮釋資料
marine, harvested by iOBIS