Risso’s Dolphin / Grampus Seasonal Occurrence & Geographic Distribution

SEASONAL OCCURRENCE GRAPH OF RISSO’S DOLPHINS / GRAMPUS (Grampus griseus)

The graph below shows the number and date of all Risso’s Dolphin sightings on all Texas Pelagics from 1994 to 2014:

 

RISSO’S DOLPHINS DISTRIBUTION OFF S PADRE ISLAND

This map shows the geographic distribution of Risso’s Dolphin sightings on 27 Texas Pelagics mostly from South Padre Island, but also includes 1 trip from Port Aransas and 2 trips from Port O’Connor. Sighting coordinates from the remaining 25 + Texas Pelagics are not available.

Risso’s Dolphins are typically restricted to deep pelagic waters beyond the shelf edge

 

MARINE MAMMAL DISTRIBUTION OFF S PADRE ISLAND

View Marine Mammals in a larger map

Click on the box in the upper left of the map to view the map legend.

Click on each sighting symbol and the data label will appear showing the time, date and the number of birds seen.

Click on the link on the bottom of the map to view a larger map.

 

RISSO’S DOLPHIN DISTRIBUTION IN NORTHERN GULF OF MEXICO³:

3: U.S. Atlantic and Gulf of Mexico Marine Mammal Stock Assessments – 2012 Volume 1; Gordon T. Waring, Elizabeth Josephson, Katherine Maze-Foley, and Patricia E. Rosel, Editors

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