Описание
Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: On 6 July to 9 August 1992, as part of a larger study, Alaska harbor porpoise (Phocoena phocoena) abundance was investigated during an aerial survey off Kodiak Island. Employing a Twin Otter as the survey platform, the first of three identical sawtooth tracklines was flown at an altitude of 152.2 m (500 ft) and at an airspeed of 185 km/h. Line-transect methodology was used, and only those observations made during optimal conditions were analyzed. Density of harbor porpoises was calculated using line transect estimates based on perpendicular distances of sightings to the cruise track of the airplane. On average, porpoise group size and density off Kodiak Island was 1.41 (SE = 0.13) and 1.85 groups/100 km2 (SE = 6.03). Purpose: Although harbor porpoises, Phocoena phocoena, are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal Laboratory initiated a 3 year study on Alaska harbor porpoises. The objectives of this program were to: 1) Obtain minimum population estimates in coastal waters using line transect methodology with a coefficient of variation for density estimates of less than 30% for each survey area, and 2) Establish a baseline for detecting changes in abundance through time, for analysis of trends. During the present study, it was not fiscally possible to survey all areas of the state in any one year. Accordingly, we selected sections of the state to survey in consecutive years to maximize the likelihood of including all of the animals for a particular area surveyed while minimizing the likelihood of significant movement between areas among survey years. Supplemental information: This dataset and associated effort data were updated on Sept 8, 2005. Those who downloaded them before that date should renew them.
Записи данных
Данные этого occurrence ресурса были опубликованы в виде Darwin Core Archive (DwC-A), который является стандартным форматом для обмена данными о биоразнообразии в виде набора из одной или нескольких таблиц. Основная таблица данных содержит 73 записей.
Данный экземпляр IPT архивирует данные и таким образом служит хранилищем данных. Данные и метаданные ресурсов доступны для скачивания в разделе Загрузки. В таблице версий перечислены другие версии ресурса, которые были доступны публично, что позволяет отслеживать изменения, внесенные в ресурс с течением времени.
Версии
В таблице ниже указаны только опубликованные версии ресурса, которые доступны для свободного скачивания.
Как оформить ссылку
Исследователи должны дать ссылку на эту работу следующим образом:
Dahlheim, M., A. York, R. Towell, J. Waite, and J. Breiwick. 2000. Harbor porpoise (Phocoena phocoena) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993. Marine Mammal Science. 16(1): 28-45.
Права
Исследователи должны соблюдать следующие права:
Публикующей организацией и владельцем прав на данную работу является OBIS-SEAMAP. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.
Регистрация в GBIF
Этот ресурс был зарегистрирован в GBIF, ему был присвоен следующий UUID: 2fa30a14-8bbd-439c-b8a7-8f8c94dc9834. OBIS-SEAMAP отвечает за публикацию этого ресурса, и зарегистрирован в GBIF как издатель данных при оподдержке Ocean Biodiversity Information System.
Ключевые слова
Occurrence,Aircraft,Sightings,harbor porpoise,Phocoena phocoena,abundance,aerial survey,marine mammal survey,survey,marine mammal,cetacean; Observation; Occurrence
Внешние данные
Ресурс также доступен в других форматах
| OBIS-SEAMAP Dataset Page | http://seamap.env.duke.edu/dataset/132 UTF-8 Interactive map |
|---|---|
| FGDC Metadata | http://seamap.env.duke.edu/dataset/132/xml UTF-8 XML |
Контакты
- Owner ●
- Originator ●
- Point Of Contact
- Metadata Provider ●
- Distributor
Географический охват
Kodiak Island,Alaska
| Ограничивающие координаты | Юг Запад [56,277, -155,024], Север Восток [58,689, -151,491] |
|---|
Таксономический охват
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
| Order | Cetacea (cetaceans), Cetacea (cetaceans) |
|---|---|
| Species | Phocoenoides dalli (Dall's Porpoise), Balaenoptera physalus (Fin Whale), Eschrichtius robustus (Gray Whale), Phocoena phocoena (Harbor Porpoise), Megaptera novaeangliae (Humpback Whale), Orcinus orca (Killer Whale) |
Временной охват
| Дата начала / Дата окончания | 1992-07-06 / 1992-07-30 |
|---|
Данные проекта
Описание отсутсвует
| Название | NMML Harbor Porpoise Aerial Survey, Kodiak Island, Replicate 1, 1992 |
|---|---|
| Финансирование | NA |
Исполнители проекта:
- Owner
- Owner
Методы сбора
NA
| Охват исследования | NA |
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Описание этапа методики:
- NA
Данные коллекции
| Название коллекции | zd_132 |
|---|---|
| Идентификатор коллекции | zd_132 |
| Идентификатор родительской коллекции | OBIS-SEAMAP |
Дополнительные метаданные
marine, harvested by iOBIS
| Цель | Although harbor porpoises, Phocoena phocoena, are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal Laboratory initiated a 3 year study on Alaska harbor porpoises. The objectives of this program were to: 1) Obtain minimum population estimates in coastal waters using line transect methodology with a coefficient of variation for density estimates of less than 30% for each survey area, and 2) Establish a baseline for detecting changes in abundance through time, for analysis of trends. During the present study, it was not fiscally possible to survey all areas of the state in any one year. Accordingly, we selected sections of the state to survey in consecutive years to maximize the likelihood of including all of the animals for a particular area surveyed while minimizing the likelihood of significant movement between areas among survey years. |
|---|---|
| Альтернативные идентификаторы | http://ipt.env.duke.edu/resource?r=zd_132 |