scholarly journals Behavior of Female Dungeness Crabs, Cancer Magister, in a Glacial Southeast Alaska Estuary: Homing, Brooding-Site Fidelity, Seasonal Movements, and Habitat Use

2002 ◽  
Vol 22 (2) ◽  
pp. 481-492 ◽  
Author(s):  
Robert P. Stone ◽  
Charles E. O'Clair
Keyword(s):  
Habitat Use ◽  
Site Fidelity ◽  
Cancer Magister ◽  
Southeast Alaska ◽  
Seasonal Movements ◽  
Dungeness Crabs

scholarly journals Ventilation, Oxygen Uptake and Haemolymph Oxygen Transport, Following Enforced Exhausting Activity in the Dungeness Crab Cancer Magister

1979 ◽  
Vol 80 (1) ◽  
pp. 271-285 ◽  
Author(s):  
B. R. McMAHON ◽  
D. G. McDONALD ◽  
C. M. WOOD
Keyword(s):  
Cardiac Output ◽  
Oxygen Uptake ◽  
Oxygen Transport ◽  
Lactate Concentration ◽  
Fold Increase ◽  
Oxygen Extraction ◽  
Oxygen Release ◽  
Cancer Magister ◽  
Metabolic Scope ◽  
Dungeness Crabs

Scaphognathite and heart-pumping frequencies, ventilation volume, cardiac output, oxygen uptake and oxygen transport by haemolymph have been studied in unrestrained Dungeness crabs (Cancer magister) before, immediately after, and during recovery from 20 min of enforced exhausting activity. Exercise increased oxygen uptake 4-fold. This increase was achieved by more than 2-fold elevation of both ventilation volume and cardiac output and by greater participation of haemocyanin in oxygen delivery. The elevated ventilation volume resulted entirely from an increase in scaphognathite pumping frequency, while the rise in cardiac output resulted largely from increase in stroke volume. Prior to exercise haemocyanin accounts for less than 50% of the oxygen delivered to the tissues. Following exercise this increases to over 80%, the additional oxygen release being mediated by a depression of prebranchial oxygen tension and a substantial Bohr effect resulting from build up of lactate ion in the haemolymph and subsequent fall in pH. These changes allowed % oxygen extraction from branchial water to be maintained at 28% despite a 2-fold increase in ventilation volume, and allowed an increase in %. oxygen extraction by the tissues. Despite these changes oxygen supply fell below demand during exercise, and considerable anaerobic metabolism resulted, as evidenced by a 9-fold increase in haemolymph lactate concentration. The resulting oxygen debt required 8–24 h for repayment. Aerobic metabolic scope, and mechanisms of increasing oxygen uptake and transport in this crab are compared with those of a range of fish species.

Seasonal Movements and Habitat Use of Female White-Tailed Deer Associated with an Urban Park

2002 ◽  
Vol 66 (1) ◽  
pp. 123 ◽  
Author(s):  
Marrett D. Grund ◽  
Jay B. McAninch ◽  
Ernie P. Wiggers
Keyword(s):  
Habitat Use ◽  
Urban Park ◽  
Seasonal Movements

scholarly journals Site fidelity, vertical movement, and habitat use of nearshore reef fishes on offshore petroleum platforms in southern California

2019 ◽  
Vol 95 (4) ◽  
pp. 657-682 ◽  
Author(s):  
Carlos Mireles ◽  
Christopher JB Martin ◽  
Christopher G Lowe
Keyword(s):  
Habitat Use ◽  
Site Fidelity ◽  
Fish Habitat ◽  
Reef Fishes ◽  
Vertical Movement ◽  
San Pedro ◽  
Ecological Importance ◽  
Bottom Depth ◽  
Petroleum Platforms ◽  
Offshore Petroleum

Off California, economically important nearshore reef fishes inhabit the shallow (<20 m) regions of offshore petroleum platforms on the San Pedro Shelf (SPS). It is essential to understand the degrees to which platforms support fish over time to indicate whether biological requirements (e.g., shelter, diet, reproduction) are being met. To determine the ecological importance of platforms as fish habitat, the site fidelity and depth/habitat use of adult cabezon, Scorpaenichthys marmoratus (Ayres, 1854), grass rockfish, Sebastes rastrelliger (Jordan and Gilbert, 1880), kelp rockfish, Sebastes atrovirens (Jordan and Gilbert, 1880), and California sheephead, Semicossyphus pulcher (Ayres, 1854) were investigated at platforms Edith (50 m bottom depth) and Eureka (212 m). A total of 63 fish were acoustically tagged and monitored for up to 578 d. Sixty-three percent of individuals were still present at platforms at the end of the study (long-term site fidelity), with 55 individuals detected a mean of 66.9% (SD 36.0%) of their total days at liberty (daily site fidelity). All species displayed a shift in seasonal depth use. The shallowest horizontal level, consisting of various horizontal beams at platform Edith (15 m depth) and Eureka (17 m), was the most utilized habitat by grass rockfish, kelp rockfish, and California sheephead. Cabezon at platform Eureka utilized depths (21–31 m) unassociated with horizontal levels, while at platform Edith they primarily utilized the second horizontal level (30 m). Decommissioning options that remove the shallowest 26 m of structure would eliminate the habitat most utilized by three of the four study species that dominate the nearshore reef fish communities at SPS platforms.

Heat-Pasteurization Process for Inactivation of Nonproteolytic Types of Clostridium botulinum in Picked Dungeness Crabmeat

1997 ◽  
Vol 60 (8) ◽  
pp. 928-934 ◽  
Author(s):  
M. E. PETERSON ◽  
G. A. PELROY ◽  
F. T. POYSKY ◽  
R. N. PARANJPYE ◽  
F. M. DONG ◽  
...  
Keyword(s):  
Clostridium Botulinum ◽  
Temperature Treatment ◽  
Heat Processing ◽  
Type B ◽  
Cancer Magister ◽  
Enrichment Medium ◽  
Heat Resistant ◽  
Heat Pasteurization ◽  
D Values ◽  
Dungeness Crabs

Development of a heat-pasteurization process is described for picked meat of Dungeness crabs (Cancer magister) contained in oxygen-impermeable flexible pouches, For each time-temperature treatment, 30 samples, each inoculated with an equal mixture of three strains of C. botulinum nonproteolytic type B, for a total of 107 spores, provided the basis for calculation of the thermal resistance (a 7D process). Following heat processing, the crabmeat was removed from the pouches and transferred to enrichment medium where it was incubated anaerobically for 150 days. Endpoints at which spores survived were determined by the presence of toxin in the enrichment medium. Process times ranged from 90 min at 88.9°C to 20.3 min at 94.4°C. D values (the time at each temperature required to reduce the inoculum by 1 log) ranged from 12.9 for the 88.9°C process to 2.9 for the 94.4°C process. The relative sterilization value, F0 was .054 and the pasteurization value, , was 240. This pasteurization process safely extends refrigerated shelf life by inactivating spores of Clostridium botulinum nonproteolytic types B, E, and F and also non-spore-forming pathogens such as Listeria monocytogenes. The process does not, however, inactivate the heat-resistant proteolytic strains of C. botulinum or other more heat-resistant spore-formers. The packages and master cartons of the pasteurized product, therefore, should be labeled “Keep refrigerated—Continuous refrigeration below 38°F (3.3°C) required.”

Habitat use, site fidelity and conservation opportunities for juvenile loggerhead sea turtles in the Río de la Plata, Argentina

2016 ◽  
Vol 163 (1) ◽  
Author(s):  
Victoria González Carman ◽  
Ignacio Bruno ◽  
Sara Maxwell ◽  
Karina Álvarez ◽  
Diego Albareda ◽  
...  
Keyword(s):  
Habitat Use ◽  
Site Fidelity ◽  
Sea Turtles ◽  
Rio De La Plata ◽  
Loggerhead Sea Turtles ◽  
Río De La Plata ◽  
La Plata
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