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Male mating signals are sexual traits that may provide females with information about the physiological quality of the individual. Males of the yellow mealworm beetle, Tenebrio molitor, use pheromones to attract mating partners. The level of pheromone production in males has been identified as a signal of the male condition. We tested whether male sex pheromones also signal the oxidative stress status...
Immune response is evolutionary costly, but it is not clear whether these costs affect energetic expenditure (short-term cost), growth (medium-term cost), or reproduction (long-term cost). We tested the costs of immune memory in Tenebrio molitor against Metarhizium brunneum. To do this, we used two groups of T. molitor larvae: (a) the control group, which was injected first with Tween solution and...
It has been proposed that given that males should invest in sexual traits at the expense of their investment in immune response, females are better immunocompetent than males. Typically, this idea has been tested in monomorphic species, but rarely has been evaluated in polymorphic male species. We used Paraphlebia zoe, a damselfly with two male morphs: the black‐winged morph (Black‐W) develop black...
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