Fig 1.
Synchronous nesting event (‘arribada’) of Lepidochelys olivacea in the Natural Sanctuary ‘La Escobilla’ (Oaxaca, Mexico).
Fig 2.
Feeding behaviour of Omorgus suberosus in the Natural Sanctuary ‘La Escobilla’ (Oaxaca, Mexico).
Necro–saprophagous behaviour of adult Omorgus suberosus (A) on the Lepidochelys olivacea egg shell, and predation of turtle eggs by O. suberosus larvae (marked by arrow).
Fig 3.
Description of the mass trapping method used for capturing Omorgus suberosus.
A) Diagram of the standard pitfall trap AR970 (ISCA TECHNOLOGIES, USA) used and B) disposition of the trap in the field; pitfall traps were partially buried in order to reduce the distance from the edge to the entrance of the trap.
Table 1.
Profile of volatile compounds in collections from turtle nests and Omorgus suberosus using the HSSE/TD–GC–MS method.
Fig 4.
Compositional similarity analysis of volatile compounds between different food resources and secretions of Omorgus suberosus.
Cluster and SIMPROF analysis based on Whittaker’s index of association as a distance measure of the chemical composition (DH, dead hatchlings; FE, fresh turtle eggs; LE, live turtle eggs; DE, dead turtle eggs) and beetles Omorgus suberosus (OM = males and OF = females). Black lines indicate significant difference (SIMPROF: π = 0.58; P < 0.05) and red lines indicate no statistically significant difference (SIMPROF: P > 0.05).
Fig 5.
EAG-responses of Omorgus suberosus to volatile compounds.
Vertical bars indicate standard errors. Different letters indicate significant differences in the EAG responses among volatile compounds, tested at P < 0.05. Hexane stimulus was used as a control.
Fig 6.
EAG concentration–response curves of Omorgus suberosus to different dose of chemicals.
Vertical bars indicate standard errors. Different letters indicate significant differences in EAG responses among volatile compounds, tested at P < 0.05. Hexane stimulus was used as a control.
Fig 7.
Olfactory response of Omorgus suberosus to active volatile compounds.
Error bars represent standard errors of the mean. Statistical differences are indicated by asterisks at P < 0.05 (*) and P < 0.005 (**) respectively. An empty vial was used as control.
Fig 8.
Capture rates (beetles per trap per day) of Omorgus suberosus, using bait.
Bars indicate the means ± SE of beetles captured; same letter indicates that there was no significant difference, at a probability of 5%. An unbaited pitfall trap was used as control.