Mating Preferences and Consequences of Choosing Sibling or Non-Sibling Mates by Females of the Predator Podisus nigrispinus (Heteroptera: Pentatomidae)
Keywords:
biological control, choice mate, sexual selection, stinkbugAbstract
The sex with the greater investment in offspring is more careful in selecting sexual partners. Mating preferences and consequences of choosing sibling or non- sibling males by Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) females were investigated. Females of this predator were placed with sibling, non- sibling or both types of males in 500 mL plastic containers. The numbers of matings and egg masses per female were registered after 12 h. Eggs were transferred to Petri dishes (9.5 × 1.5 cm) and the number of nymphs that hatched were recorded daily until 10 days after each oviposition. Female longevity with sibling, nonsibling or both types of males was registered and adults were weighed and measured after their deaths. Females of P. nigrispinus did not discriminate between sibling or non- sibling males, which can lead to inbreeding. However, the greater number of eggs laid and the higher egg viability of P. nigrispinus females that mated with non- sibling males indicate that this predator can avoid inbreeding depression including reduced fitness by mating with unrelated males.
O sexo que mais investe na prole é mais seletivo na escolha dos parceiros sexuais. Preferências e consequências da escolha de parentes (irmãos) ou não-irmãos por fêmeas de Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) foram estudadas. Fêmeas desse predador foram colocadas com machos irmãos ou não-irmãos em recipientes plásticos (500 ml). O número de acasalamentos e o de massas de ovos foram registrados por fêmea em intervalos de 12 horas. Os ovos foram transferidos para placas de Petri (9,5 × 1,5 cm) e o número de ninfas eclodidas observado, diariamente, até 10 dias após cada oviposição. A longevidade de fêmeas copuladas com machos irmãos, não-irmãos ou ambos foi registrada e após a morte, os adultos foram pesados e medidos. Fêmeas de P. nigrispinus não discriminam entre machos irmãos ou não-irmãos, indicando que este predador pode evitar a endogamia incluindo redução da aptidão por meio de cruzamentos com machos não relacionados.
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