Descripción
The distribution of marine mammal species in many areas remains poorly understood, especially as observations for some taxa are rare and large-scale surveys are time consuming and extremely costly. Here, we present 36 records of 7 cetacean species (Balaenoptera brydei, B. musculus subspp., Delphinus delphis, Globicephala sp., Grampus griseus, Physeter macrocephalus, Pseudorca crassidens) in the New Caledonia Basin, Tasman Sea. Data were derived from a platform of opportunity during a seismic survey that ran between December 2015 and March 2016, inclusively. The two most frequently encountered species were sperm whales (Physeter macrocephalus, 13 sightings, 5 acoustic detections) and blue whales (Balaenoptera musculus subspp., 8 visual detections). All encountered species are known to occur in New Zealand waters at least occasionally, based on historical sightings and stranding records. However, data presented here are the first cetacean records for this specific area and demonstrate that seismic vessels can act as a platform of opportunity for studying cetacean distribution in poorly accessible areas. Such data will aid future research efforts including species distribution models on cetaceans in the South Pacific.
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 36 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:
Peters K J, Stockin K A (2024). Cetacean sighting records during a seismic survey in the New Caledonia Basin, Tasman Sea, 2015-6. Version 1.0. Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. Samplingevent dataset. https://nzobisipt.niwa.co.nz/resource?r=cetaceans_newcaledoniabasin_2015&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: 8c5b8c75-ea71-43f3-ab1a-8706ab732e3b. 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
Occurrence; Observation
Contactos
- Proveedor De Los Metadatos ●
- Originador ●
- Punto De Contacto
- Originador
Cobertura geográfica
Tasman Sea
| Coordenadas límite | Latitud Mínima Longitud Mínima [-38,839, 164,9], Latitud Máxima Longitud Máxima [-31,55, 173,669] |
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Cobertura taxonómica
Cetaceans (whales and dolphins)
| Orden | Cetartiodactyla |
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Cobertura temporal
| Fecha Inicial / Fecha Final | 2015-12-18 / 2016-03-28 |
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Métodos de muestreo
Cetacean surveys were completed in the southern sector of the New Caledonia Basin in the Tasman Sea to the west of New Zealand’s North Island. A total survey area coverage of 205,000 km2 was achieved, from ~200 km from New Zealand’s west coast (171.430609 E, 37.650542 S), extending 1,200 km onto the New Zealand extended continental shelf (163.322699 E, 32.446492 S). Water depth in the basin ranges from 2,000–3,500 m. The geophysical seismic survey vessel Hai Yang Shi You 718 was deployed to conduct a two-dimensional (2D) marine seismic survey between 18 December 2015 and 28 March 2016. As required under the 2013 New Zealand Code of Conduct for Minimising Acoustic Disturbance to Marine Mammals from Seismic Survey Operations, qualified and80trained marine mammal observers and passive acoustic monitoring (PAM) operators maintained a 24-hour monitoring program for cetaceans, this way serving as an opportunistic observational platform.
| Área de Estudio | New Caledonia Basin, Tasman Sea |
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Descripción de la metodología paso a paso:
- Visual observations were completed by two MMOs in rotating shifts (one MMO on duty at any time) during daylight hours (dawn to dusk) from the bridge, bridge deck and wings of the seismic vessel, providing 360° visibility of the area at a height of 16.5 m above sea level. Observers predominantly scanned the area for cetaceans with the naked eye but used binoculars (7 x 50 magnification) to search the horizon and to determine species and estimate group size. When cetaceans were sighted, observers estimated the radial sighting distance to the animal(s) using the binoculars’ reticules following (Lerczak and Hobbs 1998). Time of day, GPS position, water depth and species were further recorded. Species determination included an indication of observer confidence ranging between ‘certain’ (100%), ‘probable’ (75%) and ‘possible’ (50%).
- In addition to the visual observations, passive acoustic monitoring (PAM) was conducted continuously by two experienced PAM operators during the entire survey (one PAM operator on duty at any time). There were three complete Seiche PAM systems onboard. Each system comprised one hydrophone array, one tow cable, one deck cable plus all electronics such as computers and audio interfaces. The towed hydrophone array consisted of four hydrophones (two low-frequency and two high-frequency) towed using a 240 m long cable at a depth of 27 m, 20 m forward of the air guns. The AD/DA audio interfaces were RME Fireface 800 - sampling rates up to 192,000 Hz (Hertz) and NI USB-6251 - sampling rates up to 500,000 Hz. At the PAM workstation, an Intel i5-3570 CPU (central processing unit), 3.40 GHz (Gigahertz) with 8 GB (Gigabyte) RAM (random access memory) was running PAMGuard version 1.14.00 Beta. This was connected to the vessel’s global positioning system (GPS) via the National Marine Electronics Association (NMEA) serial port at a baud rate of 9,600. All three hydrophone arrays were tap tested and calibrated for depth while in transit to the survey area. The final PAMGuard configuration was set to detect endemic and vagrant cetaceans using high and low frequency click detectors with respective ranges of 0–24 kHz (kilohertz) and 10 Hz–250 kHz.
Referencias bibliográficas
- Peters, K. J., & Stockin, K. A. (2022). Cetacean sighting records in the New Caledonia Basin, Tasman Sea, New Zealand. New Zealand Journal of Marine and Freshwater Research, 56(1), 135–149. https://doi.org/10.1080/00288330.2020.1867201
Metadatos adicionales
marine, harvested by iOBIS
| Identificadores alternativos | https://nzobisipt.niwa.co.nz/resource?r=cetaceans_newcaledoniabasin_2015 |
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