Refine Results
Species Category

Harbor Porpoise Results

7 results match your filter criteria.

Copper River Delta Carcass Surveys - Final Reports

Biologists conducted survey flights of the shifting sand shoals of the Copper River Delta to search for marine mammal carcasses and to conduct necropsies of any observed carcasses in order to establish the cause of death and collect biological samples.
May 03, 2021 - Other Reports ,

Temporal Changes In Abundance Of Harbor Porpoise (Phocoena Phocoena) Inhabiting The Inland Waters Of Southeast Alaska

Abundance of harbor porpoise (Phocoena phocoena) was estimated from data collected during vessel surveys conducted throughout the inland waters of Southeast Alaska. Line-transect methods were used during 18 seasonal surveys spanning 22 years (1991–2012). Estimates were derived from summer surveys only because of the broader spatial coverage and greater number of surveys during this season than during other seasons. Porpoise abundance varied when different periods were compared (i.e., 1991–1993, 2006–2007, and 2010–2012); however, persistent areas of high porpoise densities occurred in Glacier Bay and Icy Strait, and off the town of Wrangell and Zarembo Island. Overall abundance of harbor porpoise significantly declined from the early 1990s (N=1076, 95% confidence interval [CI]=910–1272) to the mid-2000s (N=604, 95% CI=468–780). This downward trend was followed by a significant increase in the early 2010s (N=975, 95% CI=857–1109) when abundance rose to levels similar to those observed 20 years earlier. Potential factors that could contribute to the downward trend were examined. The 2 regions with high densities of harbor porpoise (i.e., Glacier Bay and Icy Strait as well as Wrangell and Zarembo islands), that were consistently occupied by this species, and the different trend values of these 2 regions indicate that some fine-scale population structuring may exist for harbor porpoise inhabiting the inland waters of Southeast Alaska.
September 06, 2018 - Assessments ,

Acoustic Monitoring And Prey Association For Beluga Whale, Delphinapterus Leucas, And Harbor Porpoise, Phocoena Phocoena, Off Two River Mouths In Yakutat Bay, Alaska

Yakutat Bay on the eastern Gulf of Alaska is a glacial fjord influenced by the activity of major tidewater glaciers at its head and is a region of high marine biodiversity. Two marine mammal species that live there year-round are the beluga whale, Delphinapterus leucas, and the harbor porpoise, Phocoena phocoena.
September 06, 2018 - Assessments ,

Harbor Porpoise, Phocoena Phocoena Vomerina, In Cook Inlet, Alaska

The harbor porpoise is among the smallest of the six porpoise species in the Family Phocoenidae, with an adult length of 1.4 m to 1.9 m (4.6–6.2 ft). They are rotund, have a stubby beak with small, spade-shaped teeth, and a triangular-shaped dorsal fin. In general, their dorsal surface is dark gray, becoming lighter gray on the sides, with a white underbelly. The sounds they make when breathing have earned them the nickname “puffing pig.” This species is rarely active at the surface but instead presents a low profile when surfacing and often travels alone. They generally forage on small, pelagic schooling fish in waters less than 200 m (656 ft) deep.
September 06, 2018 - Assessments ,

Harbor Porpoise Research in Alaska

We assess harbor porpoise populations and their response to environmental change in Alaskan waters.
HARBOR PORPOISE - SEAK_07-Jul-16_DC-SS_DLW_183crop-2.jpg

A Little Bit of Seawater Is Helping Scientists Study Elusive Harbor Porpoise off the Coast of Alaska

Scientists hope genetic approaches can help them determine the number of harbor porpoise populations in Southeast Alaska.
August 08, 2018 - Feature Story ,
Porpoise_credit NOAA D.Webster.jpg