Critical Thermal Maximum of the Green Lynx Spider, Peucetia Viridans (Araneae, Oxyopidae)

Hanna, Chadwick J.; Cobb, Vincent A.

doi:10.1636/sh06-01.1

Cited by 22 publications

(24 citation statements)

References 12 publications

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“…In the laboratory, ant walking speed rapidly increased at temperatures between 20 and 30°C. These temperatures may indicate a point of thermal discomfort at which rapid movement is initiated (Hanna and Cobb, 2007). At temperatures above 30°C, walking speed remained relatively constant around maximum walking speed until the CT max was reached (Fig.8A).…”

Section: Temperature Tolerance and Activity Times In The Diurnal Antmentioning

confidence: 94%

Different effects of temperature on foraging activity schedules in sympatric Myrmecia ants

Jayatilaka

Narendra

Reid

et al. 2011

Journal of Experimental Biology

101

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SUMMARYAnimals avoid temperatures that constrain foraging by restricting activity to specific times of the day or year. However, because temperature alters the availability of food resources, it is difficult to separate temperature-dependent effects on foraging and the occupation of temporal niches. By studying two congeneric, sympatric Myrmecia ants we isolated the effect of temperature and investigated whether temperature affects foraging schedules and causes the two ants to be active at distinct times of the day or year. We monitored foraging activity and identified the ants' temperature tolerance in the laboratory by determining (1) critical thermal minima and maxima (CT min and CT max ) and (2) the relationship between walking speed and temperature. Ants of Myrmecia croslandi were diurnal throughout the year, but ceased above-ground activity during winter. Surface temperature at the onset of foraging was 9.8-30.1°C, while their laboratory CT min and CT max were 10.4 and 48.5°C, respectively. Time of foraging onset was significantly influenced by surface temperature at time of sunrise and of onset. Ants of Myrmecia pyriformis were nocturnal throughout the year. Surface temperature at the onset of foraging was 5.4-26.2°C, while their laboratory CT min and CT max were 8.2 and 41.6°C, respectively. Time of foraging onset was not influenced by surface temperature, but solely by sunset time. We conclude that temperature determines the timing of foraging as well as the daily and seasonal foraging activity in M. croslandi, but has less obvious effects on M. pyriformis. In both species, CT max was greater than temperatures at the natural foraging times.

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Section: Temperature Tolerance and Activity Times In The Diurnal Antmentioning

confidence: 94%

Different effects of temperature on foraging activity schedules in sympatric Myrmecia ants

Jayatilaka

Narendra

Reid

et al. 2011

Journal of Experimental Biology

101

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“…the point at which the organism first exhibits signs of thermal stress). CTM has been widely used for a range of organisms including terrestrial spiders (Hanna & Cobb, 2007). In contrast, the static method, which is equivalent to the incipient lethal temperature (ILT) technique (Fry, 1947;Beitinger et al 2000), involves holding duration constant whilst temperature is varied, with assessments based on survival of a proportion of a sample (Terblanche et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Critical Thermal Maxima of aquatic macroinvertebrates: towards identifying bioindicators of thermal alteration

2011

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Water temperature is an important abiotic driver of aquatic ecosystems. It influences many aspects of an organism's existence including its growth, feeding and metabolic rates; emergence; fecundity; behaviour and ultimately survival. All organisms have an optimum temperature range within which they survive and are able to thrive. Determining upper thermal limits provides insight into the relative sensitivity of organisms to elevated temperatures. Thermally sensitive taxa may be useful as bioindicators of thermal alteration and used in the generation of target thermal thresholds for aquatic systems. This study determined the upper thermal limit (CTmax) of a range of aquatic macroinvertebrates from rivers in the south-western Cape, South Africa, using the dynamic Critical Thermal Method. The study focused on the taxonomic level of family as an initial screening tool for ranking thermal sensitivity. Of the 27 families examined, four were both thermally sensitive and highly suitable as test organisms, including Paramelitidae, Notonemouridae, Teloganodidae and Philopotamidae. Five families were moderately sensitive and highly suitable, including Palaemonidae, Heptageniidae, Leptophlebiidae, Corydalidae and Aeshnidae. Preliminary experiments to determine potential sources of variation in CTmax revealed that thermal sensitivity was relatively uniform within families, but that acclimation temperature influenced CTmax. Further investigation of the influence of thermal history, acclimation temperature and rate of temperature change on CTmax is necessary. Target water temperatures for river management will be derived using CTmax data, in addition to longer duration experimental data, which will be linked to in situ temperature data.

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“…observation). In aquatic insects CTM has been widely used for a range of organisms including terrestrial spiders (Hanna and Cobb, 2007) and is comparatively quick and requires a relatively small sample size of test organisms (approximately n ¼30). The static method, which is equivalent to the incipient lethal temperature (ILT) technique (Fry, 1947;Beitinger et al, 2000), involves holding duration constant while temperature is varied, with assessments based on survival of a proportion of a sample (Terblanche et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Upper thermal limits of aquatic macroinvertebrates: Comparing critical thermal maxima with 96-LT50 values

Dallas

Ketley

2011

Journal of Thermal Biology

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Critical Thermal Maximum of the Green Lynx Spider, Peucetia Viridans (Araneae, Oxyopidae)

Cited by 22 publications

References 12 publications

Different effects of temperature on foraging activity schedules in sympatric Myrmecia ants

Different effects of temperature on foraging activity schedules in sympatric Myrmecia ants

Critical Thermal Maxima of aquatic macroinvertebrates: towards identifying bioindicators of thermal alteration

Upper thermal limits of aquatic macroinvertebrates: Comparing critical thermal maxima with 96-LT50 values

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