Variations of Abundance and Hatch Timing of Dungeness Crab Larvae in Southeastern Alaska: Implications for Climate Effect

다국어 초록 (Multilingual Abstract)

Variations of larval abundance and hatch timing
of Dungeness crabs, Cancer magister Dana 1852, were
investigated. Dungeness crab larvae were monthly collected
at 16 stations arrayed in four transects, Upper Chatham, Icy
Strait, Cross Sound, and Icy Point, in southeastern Alaska
from May to September 1997-2004. Larval abundance at all
transects was the highest in June except in the Icy Point
transect. Larval abundance was the highest in the Icy Strait
transect, moderate in the Upper Chatham and Cross Sound
transects, and the lowest in the Icy Point transect. Zoeae I
(ZI) was predominated in May; thereafter ZI decreased and
late zoeal stages occurred. In May and June, small numbers
of late stage larvae unusually co-occurred with ZI in three
transects. These late stage larvae may have been transported
from where hatching occurs earlier. The timing of ZI
occurrence varied interannually and was related to degreedays
during the egg incubation period of Dungeness crabs:
later larval hatching in 1997 and 2002 when temperatures
were colder, while earlier larval hatching in 1998 when
temperatures were warmer. The distribution patterns of
Dungeness crab larvae in southeastern Alaska were markedly
different from those reported from other areas of the species
distribution ranges: larvae occurring much later in the year,
and late stage larvae occurring in inland waters.

다국어 초록 (Multilingual Abstract)

Variations of larval abundance and hatch timing
of Dungeness crabs, Cancer magister Dana 1852, were
investigated. Dungeness crab larvae were monthly collected
at 16 stations arrayed in four transects, Upper Chatham, Icy
Strait, Cross Sound, and Icy Point, in southeastern Alaska
from May to September 1997-2004. Larval abundance at all
transects was the highest in June except in the Icy Point
transect. Larval abundance was the highest in the Icy Strait
transect, moderate in the Upper Chatham and Cross Sound
transects, and the lowest in the Icy Point transect. Zoeae I
(ZI) was predominated in May; thereafter ZI decreased and
late zoeal stages occurred. In May and June, small numbers
of late stage larvae unusually co-occurred with ZI in three
transects. These late stage larvae may have been transported
from where hatching occurs earlier. The timing of ZI
occurrence varied interannually and was related to degreedays
during the egg incubation period of Dungeness crabs:
later larval hatching in 1997 and 2002 when temperatures
were colder, while earlier larval hatching in 1998 when
temperatures were warmer. The distribution patterns of
Dungeness crab larvae in southeastern Alaska were markedly
different from those reported from other areas of the species
distribution ranges: larvae occurring much later in the year,
and late stage larvae occurring in inland waters.

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