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Author: Wongyu Park Publisher: ISBN: 9780549069089 Category : Dungeness crab Languages : en Pages : 165
Book Description
Mixing, loss, and distribution of larval Dungeness crabs were investigated inside and outside of Glacier Bay, southeastern Alaska, biweekly from late May to mid-September and monthly in Icy Strait from late May to late August in 2004. Larvae were collected from two different portions of the water column: above and below the thermocline and at four stations in Icy Strait. Larval loss was markedly high for ZI, ZIV, and ZV, and relatively low for ZII and ZIII. ZI occurred from late May to late July. Larval stages progressed seasonally from ZI to ZV and density decreased from ZI through ZV. The larval densities at the inner and outer bay stations and at the shallow and deep depths were similar.
Author: Wongyu Park Publisher: ISBN: 9780549069089 Category : Dungeness crab Languages : en Pages : 165
Book Description
Mixing, loss, and distribution of larval Dungeness crabs were investigated inside and outside of Glacier Bay, southeastern Alaska, biweekly from late May to mid-September and monthly in Icy Strait from late May to late August in 2004. Larvae were collected from two different portions of the water column: above and below the thermocline and at four stations in Icy Strait. Larval loss was markedly high for ZI, ZIV, and ZV, and relatively low for ZII and ZIII. ZI occurred from late May to late July. Larval stages progressed seasonally from ZI to ZV and density decreased from ZI through ZV. The larval densities at the inner and outer bay stations and at the shallow and deep depths were similar.
Author: Quinn T. Smith Publisher: ISBN: Category : Dungeness crab Languages : en Pages : 104
Book Description
"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.
Author: Cairbre Fanslow Publisher: ISBN: Category : Dungeness crab Languages : en Pages : 84
Book Description
Spatial and temporal genetic variation was assessed using mitochondrial DNA from adult and megalopae of Dungeness crabs, Cancer magister, from Fraser Delta in British Columbia, Washington, Oregon, and California. Megalopae were continuously sampled using light traps in one location, Coos Bay, Oregon, and compared with adults sampled across the species' range. While small-scale spatial and temporal variation were evident, there was no significant fit to the Isolation-by-Distance model when considering adult and larvae populations sampled over a coastal length of ~1700 km (Mantel r = 0.059, p = 0.289). Smaller bays showed higher genetic diversity than larger bays, contrary to typical expectations. MtDNA diversity measures (assessed by canonical correlation analysis) were correlated with bay size and depth, suggesting that hydrological patterns or fishing harvests in local areas (or a combination of both) influenced the observed genetic signature. The Dungeness crab ancestral population likely went through a historic population expansion associated with recent glacial relaxation, as evidenced by mismatch distributions and predominance of singleton haplotypes. In larval samples, we commonly observed numerous individuals of a haplotype, which suggests that families of larvae remain aggregated during dispersal. Sampled offspring revealed a low fraction of the adult gene pool (in accordance with the Hedgecock effect), yet high variability in recruitment over time. A realized long distance dispersal of larvae and the additive effects of recruitment from different sources over time may have prevented significant genetic differentiation within the C. magister range.
Author: Food and Agriculture Organization of the United Nations Publisher: Food & Agriculture Org. ISBN: 9251306079 Category : Technology & Engineering Languages : en Pages : 654
Book Description
This report indicates that climate change will significantly affect the availability and trade of fish products, especially for those countries most dependent on the sector, and calls for effective adaptation and mitigation actions encompassing food production.
Author: Wongyu Park
Author: Wongyu Park
Author: Quinn T. Smith
Author: Paul W. Wild
Author: Earl E. Ebert
Author: Earl E. Ebert
Author: Cairbre Fanslow
Author: Kenneth R. Carrasco
Author: Valliammal Chockalingam
Author: Food and Agriculture Organization of the United Nations
Author: Jeffrey J. Duda