On the respiratory quotient (RQ) of termites (Insecta: Isoptera).
On the respiratory quotient (RQ) of termites (Insecta: Isoptera).
复制标题
关于白蚁（昆虫纲：等翅目）的呼吸商（RQ）。
DOI：
10.1016/s0022-1910(97)00036-x
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发表时间：
1997
影响因子：
2.2
通讯作者：
P. Eggleton
中科院分区：
文献类型：
--
作者：
L. Nunes;D. Bignell;N. Lo;P. Eggleton
采用Warburg测压法测定了来自喀麦隆Mbalmayo森林保护区的23种白蚁和英国实验室培养的3种亚热带白蚁以及澳大利亚新鲜采集的白蚁在28°C时的呼吸商（RQ）。这些数据与其他最近报道的RQs（由测压法或气相色谱测定）和测量的ch4排放率一起制成表格，以提供29种物种的调查，涵盖所有主要营养（功能）类别的低级和高级白蚁。在所有物种中，除了取食木材的acinaciformis Coptotermes和取食土壤的Cubitermes fungifaber外，观测到的平均值（根据已知的h24和CH4通量进行测压校正）都在1.00或远高于1.00。土壤取食形式（除C. fungifaber外）普遍表现出较高的表观RQ（未校正H2）， 13种中有9种在1.20以上，6种在1.30以上。实验表明，在4小时的孵育过程中，RQ随时间的推移呈下降趋势，但仍大于1.00。观察到的RQs与碳水化合物是所有营养和分类类别中支持呼吸的主要底物一致，木质素或其他多芳香物质的降解很少或没有贡献。然而，在许多物种中（特别是土食性动物），观察到的RQ大于假设碳水化合物是呼吸底物的O2、co2和ch4的已知通量所预期的RQ。这假设有一个大的氢汇（除了ch4的产生），可能是H2gas的排放，和/或存在未解决的消化机制或电子路线。讨论了白蚁测压法的不确定性。
The respiratory quotient (RQ) at 28°C was determined by Warburg manometry in 23 species of termites from the Mbalmayo Forest Reserve (Cameroon) and three sub-tropical species cultured under laboratory conditions in the U.K. or freshly collected in Australia. The data are tabulated with other recently reported RQs (determined by manometry or GC) and with measured CH4emission rates to provide a survey of 29 species covering both lower and higher termites in all major trophic (functional) categories. In all species, except the wood-feeding Coptotermes acinaciformis and the soil-feeding Cubitermes fungifaber, the observed mean values (with manometry corrected for known fluxes of H2and CH4) were at or well above 1.00. Soil-feeding forms (except C. fungifaber) generally showed a high apparent RQ (not corrected for H2), with nine species (out of 13) above 1.20 and six species above 1.30. Well-replicated laboratory experiments with Reticulitermes lucifugus showed that there was a tendency for RQ to fall with time over a 4-h incubation, although remaining greater than 1.00. The observed RQs are consistent with carbohydrate being the principal substrate supporting respiration in all trophic and taxonomic categories, with little or no contribution from the degradation of lignin or other polyaromatic materials. However, in many species (especially soil-feeders), the observed RQ is greater than that expected from known fluxes of O2, CO2and CH4on the assumption that carbohydrate is the respiratory substrate. This presupposes that there is a large hydrogen sink (additional to CH4production), possibly the emission of H2gas, and/or the existence of unresolved digestive mechanisms or electron routings. Uncertainties in the use of manometry with termites are discussed.