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Although studies classify the polygynous mating system of a given species into female defense polygyny (FDP) or resource defense
polygyny (RDP), the boundary between these two categories is often slight. Males of some species may even shift between these
two types of polygyny in response to temporal variation in social and environmental conditions. Here, we examine the mating
system of the Neotropical harvestman Acutisoma proximum and, in order to assess if mate acquisition in males corresponds to FDP or RDP, we tested four contrasting predictions derived
from the mating system theory. At the beginning of the reproductive season, males fight with other males for the possession
of territories on the vegetation where females will later oviposit, as expected in RDP. Females present a marked preference
for specific host plant species, and males establish their territories in areas where these host plants are specially abundant,
which is also expected in RDP. Later in the reproductive season, males reduce their patrolling activity and focus on defending
individual females that are ovipositing inside their territories, as what occurs in FDP. This is the first described case
of an arachnid that exhibits a shift in mating system over the reproductive season, revealing that we should be cautious when
defining the mating system of a species based on few observations concentrated in a brief period.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
2.
Summary. The opilionid, Parampheres ronae, has
a pair of orange markings on its carapace at a location where some other opilionids
discharge yellowish, quinone-containing defensive fluid. P. ronae
itself produces a defensive secretion, but the fluid is quinone-free and nearly
translucent. We suggest that the orange markings in P. ronae
are aposematic in the sense that they are imitative of the glandular emissions of
quinone-producing opilionids. 相似文献
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