Time series of the abundance of the post-larvae of the crabsCancer magister andcancer spp. on the Southern Oregon coast and their cross-shelf transport

Johnson, Jeremiah; Shanks, Alan L.

doi:10.1007/bf02692211

Cited by 19 publications

(19 citation statements)

References 33 publications

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“…Megalopae in early intermolt have been observed beyond the edge of the continental shelf, up to 170 km off the coasts of Washington and Vancouver Island (Jamieson et al 1989) and 185 km off the coast of California (Reilly 1983). Megalopae are then transported back into nearshore areas (Jamieson & Phillips 1993, Eggleston & Armstrong 1995, Johnson & Shanks 2002, Miller & Shanks 2004 where larval settlement occurs (Carrasco et al 1985, Jamieson & Phillips 1988, McConnaughey et al 1992.…”

Section: Settlement Of Dungeness Crabmentioning

confidence: 99%

Transport of Dungeness crab Cancer magister megalopae into Glacier Bay, Alaska

Herter¹,

Eckert²

2008

Mar. Ecol. Prog. Ser.

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Larval behaviors and physical forcing mechanisms contributing to the transport of Dungeness crab Cancer magister megalopae into inlets have been determined for many areas along the coastlines of Washington, Oregon and California, but have never been examined in Alaska. In 2004 and 2005, we observed transport of C. magister megalopae into Glacier Bay through patterns of depth, spatial and temporal variation among 3 sites located at 8, 12 and 18 km from the Bay's mouth using light traps. At each site, 96.5 to 99.4% of megalopae were captured by traps positioned within 1 m of the surface, and few were captured in traps within 1 m of the bottom (10 m depth). Megalopae abundance decreased with increasing distance from the mouth of Glacier Bay, with the highest abundance captured in Bartlett Cove, followed by the South Beardslee Islands, and very few megalopae were captured in the North Beardslee Islands. Transport processes were correlated with proxies for lunar cycle, tidal amplitude, maximum sustained wind speed and interactions among these effects. Few megalopae were captured at any site during 3 ⁄ 4 and full moon periods. High megalopae abundances in Bartlett Cove were associated with new to 1 ⁄ 2 moons and tidal amplitudes of 300 to 499 cm. Pulses of megalopae in the South Beardslee Islands occurred during new and 1 ⁄ 4 moons with tides of 500 to 599 cm and moderate winds. Variation in megalopae supply to sites in lower Glacier Bay may be explained by differences in hydrodynamics, even among sites separated by less than 10 km.

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Section: Settlement Of Dungeness Crabmentioning

confidence: 99%

Transport of Dungeness crab Cancer magister megalopae into Glacier Bay, Alaska

Herter¹,

Eckert²

2008

Mar. Ecol. Prog. Ser.

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“…Most cancrid crabs are found in cold temperate and boreal waters (MacKay, 1943) and provide a huge proportion of crustacean fisheries in those regions (Bennett, 1995;Johnson and Shanks, 2002). Due to their commercial importance population structure and recruitment of cancrid crabs have been the subject of several studies (e. g. Hankin et al, 1997;Eaton et al, 2003;Taggart et al, 2004;Fischer and Thatje, 2008;Fischer et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature on the zoeal development and elemental composition of the cancrid crab, Cancer setosus Molina, 1782 from Pacific South America

Weiss

Heilmayer

Brey

et al. 2009

Journal of Experimental Marine Biology and Ecology

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a b s t r a c t a r t i c l e i n f oTemperature changes during ENSO cause mass mortalities of adult Cancer setosus, but the effects on early life stages are unknown. The influence of temperature on survival, development and biochemical composition was studied in larvae of the hairy crab, C. setosus, from a population off the northern Chilean coast. In rearing experiments conducted at four different temperatures (12, 16, 20, 22°C), zoeal development was only completed at 16 and 20°C, after 78 and 36 days, respectively. Instar duration was negatively correlated with temperature. A multiple linear model relating larval body mass (in carbon) to temperature and developmental time suggests that successful larval development is possible within a narrow temperature range only. The biochemical composition, measured as carbon, hydrogen, and nitrogen (C, H, N) content, show in general the typical oscillating changes during the moult cycle of brachyuran crab larvae. However, at high (22°C) and low (16°C) temperatures, CHN values show deviations from the typical pattern, indicating threshold temperatures for larval activity and survival. These findings indicate that the larval development of C. setosus is compromised under conditions of El Niño, with temperatures exceeding the upper thermal temperature tolerance threshold of larvae. Effects of El Niño on early life history stages and recruitment rates should be increasingly taken into account in fisheries management strategies.

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“…On a diurnal time scale, the hydrographic conditions also showed some variability, as shown by the oscillations of thermo-and oxycline depths (Z therm and Z oxy ). This variability could be related to internal waves that may aVect the vertical dynamics of zooplankton (Pineda 1999;Johnson and Shanks 2002;Rinke et al 2007). The apparent semidiurnal frequency of the observed oscillations indicates tidal forcing of these internal waves, although local surface tidal amplitude is less than 1 m. The observed oscillations in cline depths may be stimulating, or at least enhancing, the "regular" diel vertical migration (descent in the early morning) observed for Centropages brachiatus.…”

Section: Dynamics Of Water Masses and Zooplankton Communitymentioning

confidence: 99%

Zooplankton vertical distribution and migration off Central Peru in relation to the oxygen minimum layer

et al. 2007

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Vertical distribution and diel vertical migration of a zooplankton community were studied at two stations oV Central Peru in April 2006. Zooplankton was collected at Wve depth strata by vertical hauls with Hydo-Bios multinet (300-m mesh, 0.25-m 2 mouth size). The zooplankton community was distributed in relation to a strong, shallow oxycline (1 ml l ¡1 oxygen isopleth generally above 36 m). The highest total abundance was always in the upper, welloxygenated layer. The most important species were: Acartia tonsa (72.86%), Centropages brachiatus (7.5%), and Paracalanus parvus (3.1%); Acartia tonsa was the dominant species at all times. Larvae of the polychaete Magelona sp. (7.5%) and larvae of the brachiopod Discinisca lamellosa (3.5%) were numerically dominant in April and small copepods e.g. Oncaea venusta (3.88%) were numerically dominant during August. Five distinct patterns of vertical distribution and migration in relation to the oxygen minimum layer were distinguished in this study: (1) Ontogenetic vertical migration through the oxycline (Acartia tonsa adults, nauplii, and copepodids), (2) permanent limitation to layers above the oxycline (e.g. Oikopleura sp., most invertebrate larvae), (3) distribution mostly below the oxycline with occasional migration into the layers just above the oxycline (Eucalanus inermis), (4) Diel Vertical Migration (Centropages brachiatus), and (5) reverse Diel Vertical Migration (larvae of the polychaete Magelona sp.).

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Time series of the abundance of the post-larvae of the crabsCancer magister andcancer spp. on the Southern Oregon coast and their cross-shelf transport

Cited by 19 publications

References 33 publications

Transport of Dungeness crab Cancer magister megalopae into Glacier Bay, Alaska

Transport of Dungeness crab Cancer magister megalopae into Glacier Bay, Alaska

Influence of temperature on the zoeal development and elemental composition of the cancrid crab, Cancer setosus Molina, 1782 from Pacific South America

Zooplankton vertical distribution and migration off Central Peru in relation to the oxygen minimum layer

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