1 / 31

Decadal Changes in Seabird Abundance in the Northwest Atlantic: Hotspots and Predictability

Explore the aggregation of seabirds, ranging densities, and the persistence of seabird distributions in the Northwest Atlantic. Discover large-scale changes in seabird abundance using broadscale surveys from 1970 to 2011. This study funded by BOEM(RE), USFWS/ACJV, NSF Polar Programs, and NOAA AMLR sheds light on predictability and spatial differences in seabird abundance over decades.

bikita
Download Presentation

Decadal Changes in Seabird Abundance in the Northwest Atlantic: Hotspots and Predictability

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hotspots of, and Decadal Changes in, Seabird Abundance in the Northwest Atlantic Richard R. Veit1, Jarrod A. Santora2, Timothy P. White1, Marie Martin1, Andrew Gilbert3 and Melanie J. Steinkamp4 1 CSI/CUNY Graduate Center 2 NOAA SW Fisheries Science Center 3 USGS Patuxent MD 4 ACJV/USFWS Patuxent MD

  2. Funded by BOEM(RE), USFWS/ACJV,NSF Polar Programs,NOAA AMLR

  3. 1.) seabirds are aggregated2.) densities range from 0.01 to 10003.) many zeroesNevertheless4.) There is predictability

  4. 1.) HOTSPOTS

  5. Effort

  6. Abundance (left), Diversity (right) Only CELLS that were sampled in BOTH time periods. 1991-2011 1991-2011 1970-1990 1970-1990

  7. 2.) CHANGES IN ABUNDANCE

  8. Northern Fulmar P=10-16

  9. Northern Fulmar 1970-1990 1990-2010

  10. Great Shearwater P= 10-16

  11. Great Shearwater 1970-1990 1990-2010

  12. Northern Gannet P=10-16

  13. Northern Gannet 1970-1990 1990-2010

  14. Dovekie P=0.001

  15. Dovekie 1970-1990 1990-2010

  16. Razorbill P=0.5

  17. Razorbill 1970-1990 1990-2010

  18. Conclusions 1.) Persistence is evident is sebird distributions 2.) Large scale changes can be detected with broadscale surveys

  19. Anomaly of Species Richness: (left) 1970-1990 and (right) 1990-2011.

  20. Spatial difference in effort between 1970-1990 (+) and 1991-2011 (-) 1991-2011 1970-1990

  21. Anomaly of Abundance: (left) 1970-1990 and (right) 1990-2011.

More Related