Effects of temperature and aerial exposure on three tropical oyster species, Crassostrea belcheri, Crassostrea iradelei and Saccostrea cucullata

Gross mismatch between thermal tolerances and environmental temperatures in a tropical freshwater snail: Climate warming and evolutionary implications

“…In contrast to the findings that upper TSMs for equatorial lizards and insects vary in breadth from a few degrees to < 12ºC Kellerman et al, 2012;Logan et al, 2013), our assessment for the freshwater snail Clea nigricans suggests it possesses a TSM for heating of approximately 20ºC. A similar value was obtained for the lower TSM for cooling (around 20ºC) in this snail, in accordance with other gastropods from lowland warm temperate and subtropical regions and other tropical shallow marine molluscs, which have thermal tolerances distinctly unrelated to and well below habitat thermal minima (Davenport and Wong, 1992;Lai et al, 2011;Miranda et al, 2010). These contradictory circumstances for C. nigricans reflect the lack of information and poor current understanding of the evolution of thermal tolerance in land dwelling (freshwater and terrestrial) gastropods.…”

Gross mismatch between thermal tolerances and environmental temperatures in a tropical freshwater snail: Climate warming and evolutionary implications

“…In contrast to the findings that upper TSMs for equatorial lizards and insects vary in breadth from a few degrees to < 12ºC Kellerman et al, 2012;Logan et al, 2013), our assessment for the freshwater snail Clea nigricans suggests it possesses a TSM for heating of approximately 20ºC. A similar value was obtained for the lower TSM for cooling (around 20ºC) in this snail, in accordance with other gastropods from lowland warm temperate and subtropical regions and other tropical shallow marine molluscs, which have thermal tolerances distinctly unrelated to and well below habitat thermal minima (Davenport and Wong, 1992;Lai et al, 2011;Miranda et al, 2010). These contradictory circumstances for C. nigricans reflect the lack of information and poor current understanding of the evolution of thermal tolerance in land dwelling (freshwater and terrestrial) gastropods.…”

Variability in age and growth of common rock oysterSaccostrea cucullata(Bivalvia) in Ascension Island (central-east Atlantic)

“…The results of the present study showed that S. cucullata accelerated their growth in cooler winter months and decelerated the growth in warmer summer months of the southern hemisphere. It is known that the heat tolerance of S. cucullata is high (43°C) and these oysters do not take any oxygen from the air because of the risk of desiccation (Davenport and Wong, 1992). However, their body temperature is taken from the rock (Davenport and Wong, 1992) that might be heated >40°C during tidal exposure.…”

“…It is known that the heat tolerance of S. cucullata is high (43°C) and these oysters do not take any oxygen from the air because of the risk of desiccation (Davenport and Wong, 1992). However, their body temperature is taken from the rock (Davenport and Wong, 1992) that might be heated >40°C during tidal exposure. Thus, increased sun radiation in summer months could depress the growth of oysters, forming a seasonal mark in the shell microstructure.…”

Comparative low temperature tolerance of small juvenile European, Ostrea edulis L., and Pacific oysters, Crassostrea gigas Thunberg

“…Tolerance limits of some other warmwater oyster species are similar to that determined here for C. gigas. For example, Crassostrea belcheri (Sowerby) and Saccostrea cucullata (Born) are tolerant down to 5.0 and 4.8°C, respectively, below which high mortalities are recorded (Davenport & Wong 1992). Small juvenile American oysters, Crassostrea virginica Gmelin, may be over-wintered at 0-6°C for up to 6 months, with survival greater than 80%, by storage in humid air (Hidu, Chapman & Mook 1988).…”

Gross mismatch between thermal tolerances and environmental temperatures in a tropical freshwater snail: Climate warming and evolutionary implications

“…In contrast to the findings that upper TSMs for equatorial lizards and insects vary in breadth from a few degrees to < 12ºC Kellerman et al, 2012;Logan et al, 2013), our assessment for the freshwater snail Clea nigricans suggests it possesses a TSM for heating of approximately 20ºC. A similar value was obtained for the lower TSM for cooling (around 20ºC) in this snail, in accordance with other gastropods from lowland warm temperate and subtropical regions and other tropical shallow marine molluscs, which have thermal tolerances distinctly unrelated to and well below habitat thermal minima (Davenport and Wong, 1992;Lai et al, 2011;Miranda et al, 2010). These contradictory circumstances for C. nigricans reflect the lack of information and poor current understanding of the evolution of thermal tolerance in land dwelling (freshwater and terrestrial) gastropods.…”

Variability in age and growth of common rock oysterSaccostrea cucullata(Bivalvia) in Ascension Island (central-east Atlantic)

“…The results of the present study showed that S. cucullata accelerated their growth in cooler winter months and decelerated the growth in warmer summer months of the southern hemisphere. It is known that the heat tolerance of S. cucullata is high (43°C) and these oysters do not take any oxygen from the air because of the risk of desiccation (Davenport and Wong, 1992). However, their body temperature is taken from the rock (Davenport and Wong, 1992) that might be heated >40°C during tidal exposure.…”

“…It is known that the heat tolerance of S. cucullata is high (43°C) and these oysters do not take any oxygen from the air because of the risk of desiccation (Davenport and Wong, 1992). However, their body temperature is taken from the rock (Davenport and Wong, 1992) that might be heated >40°C during tidal exposure. Thus, increased sun radiation in summer months could depress the growth of oysters, forming a seasonal mark in the shell microstructure.…”

Comparative low temperature tolerance of small juvenile European, Ostrea edulis L., and Pacific oysters, Crassostrea gigas Thunberg

“…Tolerance limits of some other warmwater oyster species are similar to that determined here for C. gigas. For example, Crassostrea belcheri (Sowerby) and Saccostrea cucullata (Born) are tolerant down to 5.0 and 4.8°C, respectively, below which high mortalities are recorded (Davenport & Wong 1992). Small juvenile American oysters, Crassostrea virginica Gmelin, may be over-wintered at 0-6°C for up to 6 months, with survival greater than 80%, by storage in humid air (Hidu, Chapman & Mook 1988).…”

Gross mismatch between thermal tolerances and environmental temperatures in a tropical freshwater snail: Climate warming and evolutionary implications

“…In contrast to the findings that upper TSMs for equatorial lizards and insects vary in breadth from a few degrees to < 12ºC Kellerman et al, 2012;Logan et al, 2013), our assessment for the freshwater snail Clea nigricans suggests it possesses a TSM for heating of approximately 20ºC. A similar value was obtained for the lower TSM for cooling (around 20ºC) in this snail, in accordance with other gastropods from lowland warm temperate and subtropical regions and other tropical shallow marine molluscs, which have thermal tolerances distinctly unrelated to and well below habitat thermal minima (Davenport and Wong, 1992;Lai et al, 2011;Miranda et al, 2010). These contradictory circumstances for C. nigricans reflect the lack of information and poor current understanding of the evolution of thermal tolerance in land dwelling (freshwater and terrestrial) gastropods.…”

Variability in age and growth of common rock oysterSaccostrea cucullata(Bivalvia) in Ascension Island (central-east Atlantic)

“…The results of the present study showed that S. cucullata accelerated their growth in cooler winter months and decelerated the growth in warmer summer months of the southern hemisphere. It is known that the heat tolerance of S. cucullata is high (43°C) and these oysters do not take any oxygen from the air because of the risk of desiccation (Davenport and Wong, 1992). However, their body temperature is taken from the rock (Davenport and Wong, 1992) that might be heated >40°C during tidal exposure.…”

“…It is known that the heat tolerance of S. cucullata is high (43°C) and these oysters do not take any oxygen from the air because of the risk of desiccation (Davenport and Wong, 1992). However, their body temperature is taken from the rock (Davenport and Wong, 1992) that might be heated >40°C during tidal exposure. Thus, increased sun radiation in summer months could depress the growth of oysters, forming a seasonal mark in the shell microstructure.…”

Comparative low temperature tolerance of small juvenile European, Ostrea edulis L., and Pacific oysters, Crassostrea gigas Thunberg

“…Tolerance limits of some other warmwater oyster species are similar to that determined here for C. gigas. For example, Crassostrea belcheri (Sowerby) and Saccostrea cucullata (Born) are tolerant down to 5.0 and 4.8°C, respectively, below which high mortalities are recorded (Davenport & Wong 1992). Small juvenile American oysters, Crassostrea virginica Gmelin, may be over-wintered at 0-6°C for up to 6 months, with survival greater than 80%, by storage in humid air (Hidu, Chapman & Mook 1988).…”