說明
Between 28 January and 10 February 2018, the National Institute of Water and Atmospheric Research and collaborators conducted a voyage to attach satellite tracking devices to pygmy blue whales in the Taranaki region of New Zealand. The aim of this voyage was to examine the movement and habitat utilization of pygmy blue whales in New Zealand waters. This paper provides a summary of preliminary data collected during this research voyage. In total, we spent 72.51 hours (1637.54 km) actively searching for blue whales over eight survey days. Eleven blue whale sighting events were made (16 animals). Two blue whales were sighted twice, meaning that a total of 14 unique individuals were encountered. Other sightings included Bryde’s (possibly sei) whales, common dolphins, Hector’s dolphins, and fur seals. Two satellite tags were successfully deployed and six skin/blubber samples were collected from four blue whales. Photo-identification data were collected for eleven individual blue whales. Overall, blue whales were found further south, in lower numbers, and were not observed surface feeding, likely due to the La Niña anomalous oceanographic conditions. This resulted in warmer temperatures (4 - 6 °C higher than average climatology), reduced west wind flows, and consequent reduction in upwelling, significantly impacting the high productivity characteristic of the Taranaki region. All photo-identification data will be provided to a collaborative Southern Hemisphere Blue Whale Catalogue, supported by IWC and collaborations have been established with other researchers to share and compare data.
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如何引用
研究者應依照以下指示引用此資源。:
Goetz K, Childerhouse S, Paton D, Ogle M, Hupman K, Constantine R, Double M, Andrews-Goff V, Zerbini A, Olson P (2024). Pygmy blue whales seen on a 2018 survey, New Zealand. Version 1.0. The National Institute of Water and Atmospheric Research (NIWA). Occurrence dataset. https://nzobisipt.niwa.co.nz/resource?r=pygmy_bluewhale_2018_nz&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 The National Institute of Water and Atmospheric Research (NIWA)。 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: 37688194-45ab-40cd-b3ea-a307e41d30dd。 The National Institute of Water and Atmospheric Research (NIWA) 發佈此資源，並經由GBIF New Zealand同意向GBIF註冊成為資料發佈者。
關鍵字
Occurrence; Observation
聯絡資訊
- 元數據提供者 ●
- 出處 ●
- 連絡人
- 出處
- 出處
- 出處
- 出處
- 出處
- 出處
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地理涵蓋範圍
northern West Coast, South Island and South Taranaki Bight, New Zealand
| 界定座標範圍 | 緯度南界 經度西界 [-42.5, 170.5], 緯度北界 經度東界 [-39.5, 173.5] |
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時間涵蓋範圍
| 起始日期 / 結束日期 | 2018-01-28 / 2018-02-10 |
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取樣方法
Visual surveys for blue whales were conducted from the M/V Star Keys operated by Western Workboats. A smaller six-meter vessel ‘Brig’ outfitted with a specialized bowsprit was housed on-board for tagging and biopsy operations. Due to the limited time available, survey effort was initially focused in the Taranaki region due to a previously described high density of blue whale sightings in the area (Torres 2013; Torres et al. 2017). The research team consisted of Kimberly Goetz (NIWA, voyage leader), Simon Childerhouse (Blue Planet Marine, tagger), Dave Paton (Blue Planet Marine, small boat driver), Mike Ogle (Department of Conservation, biopsy collector), and Krista Hupman (NIWA, photo-identification).
| 研究範圍 | Northern coast of West Coast, South Island and South Taranaki Bight |
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方法步驟描述:
- All visual surveys were conducted on an outdoor platform located above the wheelhouse, approximately 7 m above the water. During each survey, the research team rotated between three positions (left observer, recorder, right observer) and alternated between searching with and without 7x 50 binoculars. Each observer spent an hour at each position (three hours on-effort) followed by two hours off-effort to minimize fatigue. A custom-built survey program was used to record all survey information which consisted of sighting (position, date, number of individuals, behavior) and weather data (Beaufort, swell, sun position, glare, horizon visibility). Additional aerial surveys were undertaken to provide wider search effort for the survey.
- Upon sighting a suspected blue whale, the vessel was guided towards the whale for species confirmation. If conditions were suitable, the Brig was launched and the main vessel acted as a safety and support vessel. The boat driver approached the animal to within 5-10 m while the tagger attached a satellite tag (SPOT-303F with a 45-sec repetition rate, Wildlife Computers) using a compressed air powered deployment (ARTS system) and collected a biopsy sample using Paxarm biopsy system. A biopsy was only attempted after tag attachment or when conditions were not suitable for tagging.
- Because there is often only one chance to get within 10 m of a blue whale, the tasks were prioritized as follows: 1) tag deployment, 2) biopsy sample, 3) photo-identification.
- When collected, biopsy samples were split and either frozen or stored in 70% ethanol for the following analyses: 1) genetic composition (ethanol), 2) stable isotope analysis (frozen), 3) hormone analysis (frozen). If the size of the biopsy sample allowed, a small portion was stored in ethanol to be housed in the tissue archive maintained by the University of Auckland. Before, during, and after tagging and biopsy operations, attempts were made to take photos for photo-identification using high resolution digital SLR cameras. However, given the priority of operations and time constraints, obtaining photographs of both right and left sides of individual animals was not possible. All data were archived at the end of each day for later quality control and reconciliation.
引用文獻
- Satellite tracking of blue whales in New Zealand waters, 2018 voyage report. Available from: https://www.researchgate.net/publication/337006236_Satellite_tracking_of_blue_whales_in_New_Zealand_waters_2018_voyage_report
- Goetz, K.T., Childerhouse, S., Paton, D., Ogle, M., Hupman, K., Constantine, R., Double, M.C., Andrews-Goff, V., Zerbini, A.N. and Olson, P.A., 2018. Satellite tracking of blue whales in New Zealand waters, 2018 voyage report. Bled, Slovenia.
額外的詮釋資料
marine, harvested by iOBIS