1 / 15

Spring Chinook Adult Migration Timing at Bonneville Dam (Update with 2010 Data)

Spring Chinook Adult Migration Timing at Bonneville Dam (Update with 2010 Data). Brandon R. Chockley Fish Passage Center TMT Year End Review – December 8, 2010. Historic Adult Counting at BON. Prior to 2001, counting at BON began on March 15 th and ran through November 15 th

reilly
Télécharger la présentation

Spring Chinook Adult Migration Timing at Bonneville Dam (Update with 2010 Data)

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. Spring Chinook Adult Migration Timing at Bonneville Dam(Update with 2010 Data) Brandon R. Chockley Fish Passage Center TMT Year End Review – December 8, 2010

  2. Historic Adult Counting at BON Prior to 2001, counting at BON began on March 15th and ran through November 15th Since 2001, counting at BON is year round Video counts from Nov. 1st to Mar. 31st Direct counts from Apr 1st to Oct. 31st All Chinook counted from Jan 1st to May 31st, are considered spring Chinook Adults are those > 22 inches in length Jacks are those < 22 inches in length

  3. Historic Adult Timing at BON FPC adult count database has daily counts at BON back to 1977 Daily counts allowed for estimation of 10%, 50%, and 90% passage date for each year Passage dates for spring Chinook adults and jacks were estimated separately Compared adult and jack spring Chinook passage dates of most recent 11 years (2000-2010) to earlier years (1977-1999) Timing comparisons based on historic counting dates, beginning on March 15th

  4. Historic Adult Timing at BON Across years, passage dates are highly variable 10% passage date for 2010 (Apr. 16th) earlier than 2009 (Apr. 25th) Average 10% passage date among recent years (2000-2010) is later Average 10% Passage Date (1977-1999) is April 10th Average 10% Passage Date (2000-2010) is April 16th

  5. Historic Adult Timing at BON 50% passage date for 2010 (Apr. 29th) earlier than 2009 (May 8th) Average 50% passage date among recent years (2000-2010) is later Average 50% Passage Date (1977-1999) is April 25th Average 50% Passage Date (2000-2010) is April 29th

  6. Historic Adult Timing at BON 90% passage date for 2010 (May 16th) earlier than 2009 (May 24th) Average 90% passage date among recent years (2000-2010) is later Average 90% Passage Date (1977-1999) is May 14th Average 90% Passage Date (2000-2010) is May 19th

  7. Historic Jack Timing at BON Spring Chinook jacks have later arrival timing at BON adults

  8. Historic Jack Timing at BON 10% passage date in 2010 (May 2nd) was earlier than 2009 (May 5th) Average 10% passage date among recent years (2000-2010) is later Average 10% Passage Date (1977-1999) is April 23rd Average 10% Passage Date (2000-2010) is May 1st

  9. Historic Jack Timing at BON 50% passage date in 2010 (May 12th) is earlier than 2009 (May 14th) Average 50% passage date among recent years (2000-2010) is later Average 50% Passage Date (1977-1999) is May 8th Average 50% Passage Date (2000-2010) is May 12th

  10. Historic Jack Timing at BON 90% passage date in 2010 (May 26th) is later than 2009 (May 23rd) Average 90% passage date among recent years (2000-2010) is later Average 90% Passage Date (1977-1999) is May 22nd Average 90% Passage Date (2000-2010) is May 24th

  11. Adult Timing and Environmental Variables Linear regression used to investigate relationships between environmental variables and 10% passage 10% passage date used was for adults and jacks combined Environmental variables were average temperature and average flow during period of March 15th to April 1st Describes conditions encountered at beginning of run Temperature data used were from Warrendale TDG gauge Located approximately 6 miles downstream of BON Temperature data available back to 1994 Flow data for analysis were total outflow at BON (Kcfs) Analyzed return years 1994 to 2010

  12. Adult + Jack Timing and Temperature ~May 5 y = -3.789(x) + 275.677 R2 = 0.376 Significant relationship between average temperature (Mar 15-Apr 1) and 10% Passage Date (p = 0.005) Later 10% passage dates were associated with cooler temperatures ~Apr. 1

  13. Adult + Jack Timing and Flow ~May 5 y = -0.005(x) + 107.138 R2 = 0.00 No significant relationship between average flow (Mar 15-Apr 1) and 10% Passage Date (p = 0.886) ~Apr. 1

  14. Summary Based on the years we used to describe recent years (2000-2010), timing of spring Chinook adults and jacks is later than previous years (1977-1999) 4-6 days for spring Chinook adults 2-7 days for spring Chinook jacks Temperature seems to have an effect on timing of spring Chinook adults at BON Cooler temperatures associated with delayed passage timing Flow does not have an effect on timing of spring Chinook adults at BON

  15. Adult Timing and Temperature ~May 5 y = -3.564(x) + 264.898 R2 = 0.353 When using adult only, still sig. relationship between average temp. (Mar 15-Apr 1) and 10% Passage Date (p = 0.007) Later 10% passage dates were associated with cooler temperatures ~Apr. 1

More Related