Heat coma temperature, relative contents of saturated/unsaturated fatty acids and reproductive maturation in the oceanic sea skaters Halobates micans

Takenaka, Shiho; Katagiri, Chiaki; Košťál, Vladimı́r; Harada, Tetsuo

doi:10.1016/j.aspen.2014.06.004

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Insect bodies contain lipids that have various functions, such as storing energy and as components in cell membranes (Takenaka et al, 2014). Many insects use lipids as an energy source and fatty acids are stored in the fat body in the form of triacylglycerol (Ghaedi and Andrew, 2016).…”

Section: Discussionmentioning

confidence: 99%

Physiological Metabolic Responses of Ophraella communa to High Temperature Stress

et al. 2019

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Considering the predicted rising temperatures under current climate change and heat wave scenarios, organisms are expected to suffer more intense and frequent thermal stress. Induced heat is accumulated by organisms and can cause a variety of physiological stress responses. Ophraella communa is an effective biological control agent of common ragweed, Ambrosia artemisiifolia , but the responses of this biocontrol agent to heat stress have not been fully elucidated and, therefore, its potential responses to climate change are uncertain. We investigated the physiological metabolism of subsequent O. communa adults after: (1) different developmental stages (egg, larval, pupal, and adult) were exposed to thermal stress for 3 h each day for 3, 5, 5, and 5 days, respectively (by stage); and (2) individuals were exposed to thermal stress throughout the egg-to-adult period for 3 h each day. The high temperatures of 40, 42, and 44°C were used to induce thermal stress. A control group was reared at 28 ± 2°C. The results showed that short- or long-term exposure to daily phasic high temperatures significantly decreased water and lipid contents and significantly increased glycogen and glycerol contents in all adults (i.e., after exposure of different stages or throughout the egg-to-adult period). However, the total sugar content significantly increased in adults after the eggs and larvae were exposed to brief short-term thermal stress. Compared to the control, the total sugar content was also significantly higher in the adults and pupae exposed to 44°C. Total sugar content in females increased significantly in response to long-term phasic thermal stress at 40°C. However, sugar content of males exposed to 44°C decreased significantly. After long-term phasic thermal stress, water and glycogen contents in males were significantly higher than in females; however, females had higher total sugar and lipid contents. Therefore, our study provides a basic understanding of the metabolic responses of O. communa to thermal stress and offers insights into its potential as a natural biocontrol agent against A. artemisiifolia during the summer season and under predicted climate change scenarios.

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Section: Discussionmentioning

confidence: 99%

Physiological Metabolic Responses of Ophraella communa to High Temperature Stress

et al. 2019

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“…As the rare case, a cross tolerance between higher and lower temperatures have been shown in six temperate and subtropical species belonging to the Drsophila melanogaster species group, and this tolerance can be related to the phospholipids contents especially un-saturated lipids contents [8]. Also in the oceanic sea skaters, H. micans, a positive correlation was detected between heat coma temperature and percentage of an unsaturated fatty acid, palmitoleic acid [21]. Un-saturated phospholipids contents could be effective for a physical flexibility of cell membranes in insects.…”

Section: Cross-tolerance Between Hardiness To Lower and Higher Tempermentioning

confidence: 92%

Relationship between Cool Coma and Heat Coma Temperatures in the Oceanic Sea Skaters Halobates Collected near the Sumatra Island in the Indian Ocean

Furuki¹,

Umamoto²,

Ohoka³

et al. 2017

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In the cruise, MR15-04 by R/V MIRAI, the samplings by the neuston net were performed in 23 rd November to 14 th December 2016 and three species of Halobates (H. germanus, H. micans, H. sp) were used for the temperature tolerance experiments after the collection. The neuston net was towed three times (3 × 15 min) on the starboard side of R/V MIRAI on the water surface with ship speed of 2 knot to water every 3 nights (19:00 -20:00) at the fixed point in the south-western direction which was located at 50 km from the Sumatra island (4˚03'S -4˚05'S, 101˚53'E) in the Indonesia. Experiments on cool coma and heat coma were performed on the three species. Seconds for recovery from cool coma and heat coma were also examined on the Halobates in this study. Cool coma temperatures, gap temperature needed (temperature from the adapted temperature) for the cool coma and seconds for the recover from cool coma ranged 13.0˚C to 25.0˚C, 3.1˚C to 16.1˚C, 1 second to 4370 seconds, respectively. Heat coma temperature, gap temperature needed for the heat coma, seconds for the recover from heat coma ranged 29.4˚C to 43.1˚C, 1.9˚C to 15.5˚C, 2 seconds to 6420 seconds, respectively. The higher temperature of cool coma temperature during the last five days was shown when Madden-Julian Oscillation has passed over the ship, R/V MIRAI than the previous 10 days in the adults of H. germanus collected at the fixed place neat to Sumatra island (One way ANOVA: F-value = 2.314, df = 7, p = 0.028). Adults of un-described species, H. sp lower cool coma temperatures shown by this un-described species might be related to that this species should be a "shore" species inhabiting shore water in which many precipitation could cause the decreased surface temperature from 30˚C -31˚C into about 25˚C. Most of adults which suffered from the cool coma recovered within 20 seconds, whereas adults which suffered heat coma at 38˚C and 39˚C needed more than 200 seconds for the recovery and many of those which did it at more than 40˚C needed more than 1000 second and some ones did not recover at all. All adults who suffered at more than 43˚C did not recover at all. There were significant and negative correlation between cool and heat coma temperatures shown by the adults of H. germanus. This correlation might imply a common physiological mechanism for lower and higher temperature tolerances for this species.

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Phenotypic plasticity, trade-offs and gene expression changes accompanying dietary restriction and switches in Bactrocera dorsalis (Hendel) (Diptera: Tephritidae)

Chen

Hou

Wei

et al. 2017

Sci Rep

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In this study, we investigated the effects of dietary restriction (DR) and variable diets on phenotypes and gene expression in oriental fruit fly, Bactrocera dorsalis (Hendel), one of the most economically important pests in the family Tephritidae around the world. As expected, we found that DR altered the B. dorsalis phenotypes by significantly increasing stress resistance and lifespan, but reduced egg production when compared with the control diet. The results suggested a trade-off between reproduction versus somatic maintenance (stress resistance) and lifespan in B. dorsalis. Diet also had a significant effect on hatchability, and DR could increase the egg hatching success of B. dorsalis. Furthermore, DR up-regulated metabolic pathways involved in energy homeostasis and down-regulated pathways in egg production, which might mediate trade-offs between somatic maintenance and reproduction under DR regimes. The gene expression profiles in response to the acute dietary switches indicated that the digestive and metabolic pathways maybe involved in the adaptability of flies to variable dietary resources. In summary, the research facilitates a better understanding of the molecular mechanisms responsible for the B. dorsalis’ phenotypic adjustments to the different qualities of the available diets.

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Heat coma temperature, relative contents of saturated/unsaturated fatty acids and reproductive maturation in the oceanic sea skaters Halobates micans

Cited by 3 publications

References 16 publications

Physiological Metabolic Responses of Ophraella communa to High Temperature Stress

Physiological Metabolic Responses of Ophraella communa to High Temperature Stress

Relationship between Cool Coma and Heat Coma Temperatures in the Oceanic Sea Skaters Halobates Collected near the Sumatra Island in the Indian Ocean

Phenotypic plasticity, trade-offs and gene expression changes accompanying dietary restriction and switches in Bactrocera dorsalis (Hendel) (Diptera: Tephritidae)

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