Description
Original provider: NOAA Southwest Fisheries Science Center (SWFSC) Dataset credits: NOAA Southwest Fisheries Science Center (SWFSC) Abstract: This 1993 line-transect survey was designed to make abundance estimates of the northern stock of common dolphin, Delphinus delphis, in the eastern Pacific. This stock of dolphin is taken in the tropical tuna fishery. The index of relative abundance for this stock, computed from sightings on tuna vessels, has declined substantially in the last decade. However, because tuna vessels cover only the southern portion of the stock's range, the declines in the index may be due to a northward shift in distribution, rather than an actual decline in abundance. The 1993 survey was designed to produce the first range-wide estimates of abundance for the northern common dolphin and its recently described congener, Delphinus capensis. This survey was conducted by the NOAA Southwest Fisheries Science Center aboard NOAA Ships McArthur and David Starr Jordan for a combined total of approximately 32,000 kilometers surveyed from late July to early November 1993. This dataset provides the time-date and geographical coordinates, by species/stock, of all cetaceans detected during the survey, as well as the daily and intra-daily start and end points of the line-transect survey by the NOAA Ship David Starr Jordan. Purpose: The primary objective of the cruise was to survey the area inhabited by the northern stock of common dolphins, and to make an estimate of its absolute abundance in order to assess the impact of the dolphins killed by the United States and international yellowfin tuna purse seine fleet in the eastern tropical Pacific. Supplemental information: [2021-04-12] Updated with additional attributes. SWFSC MMTD Cruise Number: 1509 Perpendicular distance will be released upon permission by the contributor. Please contact the contributor if needed. Attribute descriptions for effort data: dist: Length of the segment (km) Mode: Effort mode type (C = closing mode; P = passing mode)
Data Records
The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 1,147 records.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
Versions
The table below shows only published versions of the resource that are publicly accessible.
How to cite
Researchers should cite this work as follows:
Gerrodette, T. 2004. SWFSC Marine Mammal Survey, PODS 1993, Cruise 1509. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/215) on yyyy-mm-dd.
Rights
Researchers should respect the following rights statement:
The publisher and rights holder of this work is OBIS-SEAMAP. To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.
GBIF Registration
This resource has been registered with GBIF, and assigned the following GBIF UUID: 6ca6f1e1-1ea3-47e1-8b81-1ca92474a6e0. OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.
Keywords
Occurrence,Vessels,Sightings,Cetaceans,Whales,Dolphins,Delphinus,Population,Abundance,Survey,Census,PODS; Observation; Occurrence
External data
The resource data is also available in other formats
| OBIS-SEAMAP Dataset Page | https://seamap.env.duke.edu/dataset/215 UTF-8 Interactive map |
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| FGDC Metadata | https://seamap.env.duke.edu/dataset/215/xml UTF-8 XML |
Contacts
- Owner ●
- Originator ●
- Point Of Contact
- Metadata Provider ●
- Distributor
Geographic Coverage
Pacific,California Current,California,Mexico,Gulf of California
| Bounding Coordinates | South West [18.692, -120.098], North East [32.094, -105.498] |
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Taxonomic Coverage
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
| Order | Cetacea (cetaceans), Cetacea (cetaceans), Cetacea (cetaceans), Cetacea (cetaceans), Cetacea (cetaceans) |
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| Suborder | Caniformia (pinnipeds) |
| Family | Hyperoodontidae, Phocidae (earless seals), Cheloniidae (Sea Turtles) |
| Genus | Delphinus (common dolphins), Mesoplodon (beaked whales), Balaenoptera (baleen whales), Kogia (pygmy sperm whales), Balaenoptera (baleen whales) |
| Species | Stenella coeruleoalba (Striped Dolphin), Steno bredanensis (Rough-toothed Dolphin), Delphinus capensis (Long-beaked Common Dolphin), Delphinus delphis (Short-beaked Common Dolphin), Tursiops truncatus (Common Bottlenose Dolphin), Stenella attenuata (Pantropical Spotted Dolphin), Grampus griseus (Risso's Dolphin), Lagenorhynchus obliquidens (Pacific White-sided Dolphin), Stenella longirostris (Spinner Dolphin), Feresa attenuata (Pygmy Killer Whale), Pseudorca crassidens (False Killer Whale), Globicephala macrorhynchus (Short-finned Pilot Whale), Orcinus orca (Killer Whale), Phocoena sinus (Gulf of California harbor porpoise), Physeter macrocephalus (Sperm Whale), Kogia breviceps (Pygmy Sperm Whale), Kogia sima (Dwarf Sperm Whale), Ziphius cavirostris (Cuvier's Beaked Whale), Balaenoptera acutorostrata (Minke Whale), Balaenoptera edeni (Eden's whale), Balaenoptera physalus (Fin Whale), Balaenoptera musculus (Blue Whale), Megaptera novaeangliae (Humpback Whale), Stenella attenuata (Pantropical Spotted Dolphin), Caretta caretta (Loggerhead Sea Turtle), Dermochelys coriacea (Leatherback Sea Turtle), Lepidochelys olivacea (Olive Ridley), Mirounga angustirostris (Northern Elephant Seal), Zalophus californianus (California Sea Lion) |
| Subspecies | Stenella longirostris orientalis, Stenella attenuata graffmani (coastal spotted dolphin) |
Temporal Coverage
| Start Date / End Date | 1993-07-29 / 1993-11-05 |
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Project Data
No Description available
| Title | SWFSC Marine Mammal Survey, PODS 1993, Cruise 1509 |
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| Funding | NA |
The personnel involved in the project:
- Owner
Sampling Methods
NA
| Study Extent | NA |
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Method step description:
- NA
Collection Data
| Collection Name | zd_215 |
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| Collection Identifier | zd_215 |
| Parent Collection Identifier | OBIS-SEAMAP |
Additional Metadata
marine, harvested by iOBIS
| Purpose | The primary objective of the cruise was to survey the area inhabited by the northern stock of common dolphins, and to make an estimate of its absolute abundance in order to assess the impact of the dolphins killed by the United States and international yellowfin tuna purse seine fleet in the eastern tropical Pacific. |
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| Alternative Identifiers | 6ca6f1e1-1ea3-47e1-8b81-1ca92474a6e0 |
| http://ipt.env.duke.edu/resource?r=zd_215 |