Author : Quinn T. Smith
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (229 download)
Book Synopsis Spatial Variation and Evidence for Multiple Transport Pathways for Dungeness Crab (Cancer Magister) Late-stage Larvae in Southeastern Alaska by : Quinn T. Smith
Download or read book Spatial Variation and Evidence for Multiple Transport Pathways for Dungeness Crab (Cancer Magister) Late-stage Larvae in Southeastern Alaska written by Quinn T. Smith and published by . This book was released on 2008 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Time series of larval abundance collected with light traps reveal large pulses of Dungeness crab (Cancer magister) late-stage larvae (megalopae) in Glacier Bay, with high variability among years. Because it is unclear whether processes affecting larval supply in Glacier Bay are broadly applicable to the larger region of southeastern Alaska, and whether larval abundances inside a marine reserve are different from areas with commercial fishing, I investigated megalopae abundance in the surrounding region. Megalopae abundances in Berner's Bay, 60 km further inland was 56 times smaller than the Glacier Bay site. In 2006, I increased the geographic extent of sampling along a 350 km gradient from the outer coast to the inside waters. I found that Glacier Bay had, on average, five times more megalopae than other sites. A 2-D tidal circulation model suggests a circulation barrier east of Glacier Bay. Morphometric differences in megalopae suggest a difference in larval size on either side of the barrier, indicating that larvae may have multiple transport pathways into inside waters. In summary, C. magister megalopae abundance in southeastern Alaska is highly spatially variable; circulation patterns in southeastern Alaska are complex, and multiple transport pathways for early stages of C. magister are likely"--Leaf iii.