CUTICULAR HYDROCARBON ANALYSIS OF THE AQUATIC BEETLE AGABUS ANTHRACINUS MANNERHEIM (COLEOPTERA: DYTISCIDAE)

1998 ◽  
Vol 130 (5) ◽  
pp. 615-629 ◽  
Author(s):  
Yves Alarie ◽  
Hélène Joly ◽  
Danielle Dennie
Keyword(s):  
Mass Spectrometer ◽  
Cuticular Hydrocarbons ◽  
Aquatic Insects ◽  
Cuticular Hydrocarbon ◽  
Hydrocarbon Composition ◽  
Gas Chromatograph ◽  
Cuticular Hydrocarbon Profile ◽  
Hydrocarbon Profile ◽  
Hydrocarbon Analysis ◽  
Aquatic Beetle

AbstractRelatively little information concerning the cuticular hydrocarbon composition of aquatic insects is known. The cuticular hydrocarbons of the aquatic beetle Agabus anthracinus Mannerheim have been identified with the aid of a gas chromatograph coupled to a mass spectrometer. The cuticular hydrocarbon profile comprises n-alkanes (46.8%), n-alkenes (27.1%), and methylalkanes (25.9%) and is basically similar to that of terrestrial Coleoptera. However, the hydrocarbons of A. anthracinus differ in that (i) the shorter chain n-alkanes are present in higher proportion, (ii) there is a relatively lower abundance of methylalkanes, and (iii) the proportion of n-alkenes is significantly higher.

scholarly journals Cuticular hydrocarbons discriminate cryptic Macrolophus species (Hemiptera: Miridae)

2012 ◽  
Vol 102 (6) ◽  
pp. 624-631 ◽  
Author(s):  
C. Gemeno ◽  
N. Laserna ◽  
M. Riba ◽  
J. Valls ◽  
C. Castañé ◽  
...  
Keyword(s):  
Biological Control ◽  
Cuticular Hydrocarbons ◽  
Cross Validation ◽  
Molecular Genetic ◽  
Cuticular Hydrocarbon ◽  
Hydrocarbon Composition ◽  
Dark Spot ◽  
Prediction Errors ◽  
Control Activity ◽  
Genetic Studies

AbstractMacrolophus pygmaeus is commercially employed in the biological control of greenhouse and field vegetable pests. It is morphologically undistinguishable from the cryptic species M. melanotoma, and this interferes with the evaluation of the biological control activity of M. pygmaeus. We analysed the potential of cuticular hydrocarbon composition as a method to discriminate the two Macrolophus species. A third species, M. costalis, which is different from the other two species by having a dark spot at the tip of the scutellum, served as a control. Sex, diet and species, all had significant effects in the cuticular hydrocarbon profiles, but the variability associated to sex or diet was smaller than among species. Discriminant quadratic analysis of cuticular hydrocarbons confirmed the results of previous molecular genetic studies and showed, using cross-validation methods, that M. pygmaeus can be discriminated from M. costalis and M. melanotoma with prediction errors of 6.75% and 0%, respectively. Therefore, cuticular hydrocarbons can be used to separate M. pygmaeus from M. melanotoma reliably.

A synopsis of the Brazilian Eucharitidae (Hymenoptera: Chalcidoidea) fauna: an annotated checklist of the family in the country, with a revised key for the New World genera

Zootaxa ◽  
2019 ◽  
Vol 4564 (2) ◽  
pp. 347
Author(s):  
THIAGO S. R. SILVA ◽  
JULIANA M. SILVA-FREITAS ◽  
KARINE SCHOENINGER
Keyword(s):  
High Resolution ◽  
New Record ◽  
New World ◽  
Cuticular Hydrocarbon ◽  
Current Work ◽  
Cuticular Hydrocarbon Profile ◽  
Hydrocarbon Profile ◽  
Annotated List ◽  
The Family ◽  
Annotated Checklist

The current work provides a revised and updated key to the genera of Eucharitidae occurring in the New World, with the major traits of genera illustrated through high-resolution photomicrography. We provide an annotated list of genera and species currently known from Brazil, with a new record for a genus previously unknown for the country. Additionally, we provide a literature revision of the biology and cuticular hydrocarbon profile for the Eucharitidae. The lack of knowledge on the eucharitid Brazilian fauna is briefly discussed. 

scholarly journals Cuticle hydrocarbons in saline aquatic beetles

2017 ◽  
Author(s):  
María Botella-Cruz ◽  
Adrián Villastrigo ◽  
Susana Pallarés ◽  
Elena López-Gallego ◽  
Andrés Millán ◽  
...  
Keyword(s):  
Cuticular Hydrocarbons ◽  
Aquatic Insects ◽  
Selection Pressure ◽  
Principal Component ◽  
Carbon Chain ◽  
Carbon Chain Length ◽  
Gas Chromatograph ◽  
Aquatic Beetles ◽  
Branched Alkanes ◽  
Chain Compounds

Hydrocarbons are the principal component of insects cuticle and play an important role in maintaining water balance. Cuticular impermeability could be an adaptative response to salinity and desiccation in aquatic insects; however, cuticular hydrocarbons have been poorly explored in this group and there are no previous data on saline species. We characterized cuticular hydrocarbons of adults and larvae of two saline aquatic beetles, namely Nebrioporus baeticus (Dytiscidae) and Enochrus jesusarribasi (Hydrophilidae), using a gas chromatograph coupled to a mass spectrometer. The CHC profile of adults of both species, characterized by a high abundance of branched alkanes and low of unsaturated alkenes, seems to be more similar to that of some terrestrial beetles (e.g. desert Tenebrionidae) compared with other aquatic Coleoptera (freshwater Dytiscidae). Adults of E. jesusarribasi had longer chain compounds than N. baeticus, in agreement with their higher resistance to salinity and desiccation. The more permeable cuticle of larvae was characterized by a lower diversity in compounds, shorter carbon chain length and a higher proportion of unsaturated hydrocarbons compared with that of the adults. These results suggest that osmotic stress on aquatic insects could exert a selection pressure on CHC profile similar to aridity in terrestrial species.

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