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    • Pinniped Monitoring for the NPS Inventory and Monitoring San Francisco Bay Area Network: 1983-2025 - Data Package

    Metadata Updated: October 23, 2025

    Within the order Carnivora, the Pinnipedia sub-order is a group of marine mammals that includes sea lions, fur seals, true seals, and walruses. Pinnipeds are keystone species who serve as excellent indicators of marine ecosystem health because they respond quickly to changing oceanic conditions. Conservation concerns include effects of climate change, human disturbance, oil spills, fishing activities (operational and biological), natural and anthropogenically enhanced toxic algal blooms, preservation of haul out habitats, biomagnified contaminants, and disease.

    Monitoring focuses on the two numerically dominant pinniped species that breed, haul out, and molt in San Francisco Bay Area Network (SFAN) parks: the Pacific Harbor Seal (Phoca vitulina richardii) and Northern Elephant Seal (Mirounga angustirostris). This information contributes significantly to the regional and stock-wide understanding of these species required under the Marine Mammal Protection Act of 1972. Ancillary data on other pinniped species are collected concurrently, but are not the primary targets of this monitoring protocol.

    Monitoring is performed annually at two SFAN parks: Point Reyes National Seashore (PORE) and Golden Gate National Recreation Area (GOGA). Objectives are to 1) determine the long-term trends in population size and seasonal distribution of seal populations at primary sites in the SFAN parks during the breeding and molt seasons, 2) determine long-term trends in reproductive success of seals through annual estimates of pup production at PORE and GOGA, and 3) determine the long-term trends in sources, frequency, and level of effects of natural and anthropogenic disturbances on harbor seal haul out use and productivity.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: us-pd

    Downloads & Resources

    Dates

    Metadata Created Date October 4, 2025
    Metadata Updated Date October 23, 2025

    Metadata Source

    Harvested from DOI NPS DCAT-US

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date October 4, 2025
    Metadata Updated Date October 23, 2025
    Publisher National Park Service
    Maintainer
    Identifier http://datainventory.doi.gov/id/dataset/nps-datastore-2315921
    Data First Published 2025-09-30T00:00:00Z
    Data Last Modified 2025-09-30T00:00:00Z
    Category Data Package
    Public Access Level public
    Bureau Code 010:24
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://ddi.doi.gov/nps-data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 2c804a3b-5d43-43f2-b77a-bfa6ff31b17c
    Harvest Source Id d917c1a9-26b7-43ea-b8c5-c77ec750a850
    Harvest Source Title DOI NPS DCAT-US
    Homepage URL https://irma.nps.gov/DataStore/Reference/Profile/2315921
    License http://www.usa.gov/publicdomain/label/1.0/
    Old Spatial -123.0286,37.4338,-122.2767,38.2447
    Program Code 010:119, 010:118
    Source Datajson Identifier True
    Source Hash a3bf774b2762189e81ba0c4cdfa857d9b5b0ded061b878c89de35de52efefee9
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -123.0286, 37.4338, -123.0286, 38.2447, -122.2767, 38.2447, -122.2767, 37.4338, -123.0286, 37.4338}

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