The influence of introduced European green crabs (Carcinus maenas) on habitat selection by juvenile native blue crabs (Portunus pelagicus)

2007 ◽  
Vol 30 (4) ◽  
pp. 601-606 ◽  
Author(s):  
Jason E. Tanner
Keyword(s):  
Habitat Selection ◽  
Carcinus Maenas ◽  
Blue Crabs ◽  
Portunus Pelagicus

Thermal tolerance of the marine crab, Portunus pelagicus (Brachyura, Portunidae)

Crustaceana ◽  
2014 ◽  
Vol 87 (7) ◽  
pp. 827-833 ◽  
Author(s):  
S. A. Qari
Keyword(s):  
Blue Crab ◽  
Thermal Tolerance ◽  
Blue Crabs ◽  
Portunus Pelagicus ◽  
Critical Thermal Maxima ◽  
Acclimation Response

Critical thermal maxima (CTMax) and minima (CTMin) were determined for the blue crab, Portunus pelagicus acclimated at 15, 20, 25, 30, and 35° ± 1°C. The CTMax of blue crabs at those acclimation temperatures were 38.17, 39.08, 40.07, 41.26, and 42.66°C, respectively. The corresponding CTMin values were 12.28, 12.57, 14.84, 16.34, and 16.57°C, respectively. The zone of thermal tolerance assessed using the CTMax and CTMin boundaries was 519.7°C2. Acclimation response ratios ranged between 0.05 and 0.28.

scholarly journals Predatory blue crabs induce stronger nonconsumptive effects in eastern oystersCrassostrea virginicathan scavenging blue crabs

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3042 ◽  
Author(s):  
Avery E. Scherer ◽  
Miranda M. Garcia ◽  
Delbert L. Smee
Keyword(s):  
Habitat Selection ◽  
Food Webs ◽  
Crassostrea Virginica ◽  
Prey Availability ◽  
Oyster Tissue ◽  
Alarm Cues ◽  
Blue Crabs ◽  
Nonconsumptive Effects ◽  
Diet Cues ◽  
Reduced Risk

By influencing critical prey traits such as foraging or habitat selection, predators can affect entire ecosystems, but the nature of cues that trigger prey reactions to predators are not well understood. Predators may scavenge to supplement their energetic needs and scavenging frequency may vary among individuals within a species due to preferences and prey availability. Yet prey reactions to consumers that are primarily scavengers versus those that are active foragers have not been investigated, even though variation in prey reactions to scavengers or predators might influence cascading nonconsumptive effects in food webs. OystersCrassostrea virginicareact to crab predators by growing stronger shells. We exposed oysters to exudates from crabs fed live oysters or fed aged oyster tissue to simulate scavenging, and to controls without crab cues. Oysters grew stronger shells when exposed to either crab exudate, but their shells were significantly stronger when crabs were fed live oysters. The stronger response to predators than scavengers could be due to inherent differences in diet cues representative of reduced risk in the presence of scavengers or to degradation of conspecific alarm cues in aged treatments, which may mask risk from potential predators subsisting by scavenging.

Ca++-ATPase activity in the hepatopancreas cells of Oniscus asellus

1992 ◽  
Vol 50 (1) ◽  
pp. 820-821
Author(s):  
G.M. Vernon ◽  
A. Surace ◽  
R. Witkus
Keyword(s):  
B Cells ◽  
Epithelial Cell ◽  
Atpase Activity ◽  
Calcium Transport ◽  
Carcinus Maenas ◽  
Cell Types ◽  
Molt Cycle ◽  
Copper And Zinc

The hepatopancreas consists of a pair of bilobed tubules comprised of two epithelial cell types. S cells are absorptive and accumulate metals such as copper and zinc. Ca++ concentrations vary between the S and B cells and during the molt cycle. Roer and Dillaman implicated Ca++-ATPase in calcium transport during molting in Carcinus maenas. This study was undertaken to compare the localization of Ca++-ATPase activity in the S and B cells during intermolt.

Hierarchical habitat selection by woodland caribou: its relationship to limiting factors

Ecography ◽  
2000 ◽  
Vol 23 (4) ◽  
pp. 466-478 ◽  
Author(s):  
W. James Rettie ◽  
Francois Messier
Keyword(s):  
Habitat Selection ◽  
Limiting Factors ◽  
Woodland Caribou

Does food-searching ability determine habitat selection? Foraging in sand of three species of gerbilline rodents

Ecography ◽  
2000 ◽  
Vol 23 (1) ◽  
pp. 122-129 ◽  
Author(s):  
Boris R. Krasnov ◽  
Georgy I. Shenbrot ◽  
Luis E. Rios ◽  
Maria E. Lizurume
Keyword(s):  
Habitat Selection ◽  
Searching Ability

Freshwater inflows and blue crabs: the influence of salinity on selective tidal stream transport

2014 ◽  
Vol 514 ◽  
pp. 137-148 ◽  
Author(s):  
KM Bittler ◽  
LP Scheef ◽  
EJ Buskey
Keyword(s):  
Blue Crabs ◽  
Tidal Stream ◽  
Selective Tidal Stream Transport ◽  
Stream Transport ◽  
Freshwater Inflows

Linking eelgrass decline and impacts on associated fish communities to European green crab Carcinus maenas invasion

2016 ◽  
Vol 548 ◽  
pp. 31-45 ◽  
Author(s):  
K Matheson ◽  
CH McKenzie ◽  
RS Gregory ◽  
DA Robichaud ◽  
IR Bradbury ◽  
...  
Keyword(s):  
Carcinus Maenas ◽  
Fish Communities ◽  
Green Crab ◽  
European Green Crab
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