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

Abstract

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 an(f CTMin boundaries was 519.7°C2. Acclimation response ratios ranged between 0.05 and 0.28.

Limited thermal plasticity may constrain ecosystem function in a basally heat tolerant tropical telecoprid dung beetle, Allogymnopleurus thalassinus (Klug, 1855)

“…The responses of A. thalassinus to acclimation, termed acclimation response ratio (ARR) was calculated for CT max using the formula: where ΔCT max = recorded change in (CT max ) (°C), and ΔAcclimation = Difference between holding and acclimation temperature (°C) following methods by 44 , 76 , 77 . This was compared to ARRs from literature to interpret how the magnitude of plasticity of thermal tolerance may likely buffer A. thalassinus under changing climates.…”

Portunus pelagicus (Linnaeus, 1758) as a Sentinel Species to Assess Trace Metal Occurrence: A Case Study of Kuwait Waters (Northwestern Arabian Gulf)

“…Critical thermal maxima (CTmax) and minima (CTmin) were determined for P. pelagicus acclimated at 15, 20, 24, 25, 28, 30, 32, and 35 °C [ 33 , 34 ]. The CTmax ranged from 38.17 °C to 44.38 °C, while the CTmin ranged from 12.28 °C to 19.30 °C [ 33 , 34 ], and both increased directly with temperature [ 34 ].…”

“…Critical thermal maxima (CTmax) and minima (CTmin) were determined for P. pelagicus acclimated at 15, 20, 24, 25, 28, 30, 32, and 35 °C [ 33 , 34 ]. The CTmax ranged from 38.17 °C to 44.38 °C, while the CTmin ranged from 12.28 °C to 19.30 °C [ 33 , 34 ], and both increased directly with temperature [ 34 ]. The high critical thermal maximum indicates the potential of this species to adapt to a wide range of temperatures and justifies its consideration as an invasive alien species.…”

“…Heat tolerance plays an important role in the successful invasion of aquatic invertebrates [ 35 , 36 ]. The acclimation response ratio ranged from 0.25 to 0.51 [ 34 ] and from 0.05 to 0.28 [ 33 ]. The juvenile and larval stages of P. pelagicus are reported to be vulnerable at temperatures below approximately 17 °C [ 37 ].…”