Haemolymph Amino Acid, Sugar and Glycerol Levels in the Namib Desert Tenebrionid Stips stali During Dehydration and Rehydration

Naidu, S.G

doi:10.1016/s1095-6433(97)00454-6

Cited by 8 publications

(15 citation statements)

References 35 publications

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“…Haemolymph was taken once only from each insect. Haemolymph sugars and glycerol were determined by gas chromatography, as described previously (Naidu, 1998), and total amino acids were determined by a modified ninhydrin assay described earlier (Naidu, 1998).…”

Section: Methodsmentioning

confidence: 99%

“…For assessment of the relative contributions of the haemolymph constituents to osmoregulation during dehydration and rehydration, the measured concentration of each of the constituents was converted to the total millimoles for that constituent (Wall, 1970;Nicolson, 1980;Naidu, 1998): mmol/l × µl haemolymph = total millimoles (estimates of molal concentrations were projected at 5% above molar values, assuming a haemolymph density of 1.05 g/ml). The osmotic contributions of the measured haemolymph constituents for Physadesmia globosa during dehydration and rehydration are shown in Table 2.…”

Section: Osmotic Contributions Of Haemolymph Constituentsmentioning

confidence: 99%

“…Despite high concentrations of amino acids and sugars being found in the haemolymph of insects (Mullins, 1985), the literature does not abound with information on the contribution of these organic constituents to haemolymph osmotic pressure (OP) and to osmoregulation. The contribution of amino acids in the regulation of haemolymph OP during dehydration and rehydration has been examined in the Negev desert tenebrionid beetle Trachyderma philistina (Broza et al, 1976), in Onymacris marginipennis larvae (Coutchie & Crowe, 1979), in the desert meloid beetle Cysteodemus armatus (Cohen et al, 1986), and in the Namib desert tenebrionid beetles Stips stali, Onymacris rugatipennis and Stenocara gracilipes (Naidu, 1998(Naidu, , 2001a. Sugar contributions as osmolar effectors, and to osmoregulation, have been examined in O. marginipennis larvae (Coutchie & Crowe, 1979), and in S. stali, O. rugatipennis and S. gracilipes (Naidu, 1998(Naidu, , 2001a.…”

Section: Introductionmentioning

confidence: 99%

“…The contribution of amino acids in the regulation of haemolymph OP during dehydration and rehydration has been examined in the Negev desert tenebrionid beetle Trachyderma philistina (Broza et al, 1976), in Onymacris marginipennis larvae (Coutchie & Crowe, 1979), in the desert meloid beetle Cysteodemus armatus (Cohen et al, 1986), and in the Namib desert tenebrionid beetles Stips stali, Onymacris rugatipennis and Stenocara gracilipes (Naidu, 1998(Naidu, , 2001a. Sugar contributions as osmolar effectors, and to osmoregulation, have been examined in O. marginipennis larvae (Coutchie & Crowe, 1979), and in S. stali, O. rugatipennis and S. gracilipes (Naidu, 1998(Naidu, , 2001a. Furthermore, while a number of studies have suggested an osmolar effector role for glycerol (Asahina et al, 1954;Marek, 1979), glycerol levels in the haemolymph have been found to contribute significantly to haemolymph OP and to osmoregulation only in the strictly nocturnal Namib tenebrionid beetle S. stali (Naidu, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Sugar contributions as osmolar effectors, and to osmoregulation, have been examined in O. marginipennis larvae (Coutchie & Crowe, 1979), and in S. stali, O. rugatipennis and S. gracilipes (Naidu, 1998(Naidu, , 2001a. Furthermore, while a number of studies have suggested an osmolar effector role for glycerol (Asahina et al, 1954;Marek, 1979), glycerol levels in the haemolymph have been found to contribute significantly to haemolymph OP and to osmoregulation only in the strictly nocturnal Namib tenebrionid beetle S. stali (Naidu, 1998). The present study, therefore, examines haemolymph amino acids, sugars, and glycerol in Physadesmia globosa (Haag) during dehydration and rehydration.…”

Section: Introductionmentioning

confidence: 99%

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Haemolymph amino acid, sugar and glycerol levels in the Namib Desert tenebrionid Physadesmia globosa (Coleoptera: Tenebrionidae) during dehydration and rehydration

Naidu¹

2006

Eur. J. Entomol.

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Section: Methodsmentioning

confidence: 99%

Section: Osmotic Contributions Of Haemolymph Constituentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Haemolymph amino acid, sugar and glycerol levels in the Namib Desert tenebrionid Physadesmia globosa (Coleoptera: Tenebrionidae) during dehydration and rehydration

Naidu¹

2006

Eur. J. Entomol.

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Fog and fauna of the Namib Desert: past and future

et al. 2020

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The future of fog-dependent habitats under climate change is unknown but likely precarious; many have experienced recent declines in fog. Fog-dependent deserts particularly will be threatened, because, there, fog can be the main water source for biota. We review the interactions between fog and fauna of the Namib Desert, about which there is 50 yr of research. We resynthesize the data, seeking patterns and mechanisms that could provide a framework for predicting outcomes of changes in fog regime in other fog-dependent deserts. In the Namib, fog constitutes the most-predictable form of free water. At least 48 Namib animal species consume free water from fog, or are likely to do so, employing both liquid and vapor phase. Fog also sustains plants that form the base for metabolic water production and wets the diet to provide pre-formed water. So fog provides or underpins all the water intake of Namib fauna. Only a few species are active fog-harvesters, though. Among Namib beetles, two species are unique in that they fog-bask; they assume stereotyped postures in wind-driven fog and droplets deposit on their carapaces. Some Namib beetle species construct surface ridges that trap fog water, which they consume. Some arthropods emerge from their subsurface habitats, or occupy its wet top layers, to access fog water, at times and in conditions outside their usual surface activity. Many more taxa, including vertebrates, use fog water opportunistically. They do not actively seek it out but use it when available. Acquiring fog water from droplets requires overcoming spherical surface tension so is possible only for animals heavier than~100 mg. Smaller animals extract water from films or acquire it in the vapor phase. Some Namib animals use hygroscopic surfaces to extract vapor from unsaturated air, at ambient humidities attained in fog or sometimes between fogs. Rapid acquisition of water during episodic fog events creates problems for storage and osmoregulation, which some Namib animals have solved in enterprising ways, including long-term internal storage of water and sequestering of osmolytes.Although not yet comprehensive, the body of research reviewed, and the principles that we have elucidated underlying fog usage, should inform future research on fauna throughout fog-dependent deserts.

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Water balance and osmoregulation in Stenocara gracilipes, a wax-blooming tenebrionid beetle from the Namib Desert

Naidu

2001

Journal of Insect Physiology

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Haemolymph Amino Acid, Sugar and Glycerol Levels in the Namib Desert Tenebrionid Stips stali During Dehydration and Rehydration

Cited by 8 publications

References 35 publications

Haemolymph amino acid, sugar and glycerol levels in the Namib Desert tenebrionid Physadesmia globosa (Coleoptera: Tenebrionidae) during dehydration and rehydration

Haemolymph amino acid, sugar and glycerol levels in the Namib Desert tenebrionid Physadesmia globosa (Coleoptera: Tenebrionidae) during dehydration and rehydration

Fog and fauna of the Namib Desert: past and future

Water balance and osmoregulation in Stenocara gracilipes, a wax-blooming tenebrionid beetle from the Namib Desert

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