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Any fast moving object (i.e. bee, dragonfly, leaf, etc.) that enters a territory will be quickly chased. The chase allows the male bee to determine if a female is unmated, or if an enemy male is in his territory. If it is a male bee, the territory owner will chase it out, but not beyond the boundary of the territory.
In the orb-weaving spider Zygiella x-notata, for example, adult females have a larger body size than adult males. [46] Size dimorphism shows a correlation with sexual cannibalism , [ 47 ] which is prominent in spiders (it is also found in insects such as praying mantises ).
No, it's not a BBC Nature Video. It's a short video documenting the fight for survival between a bumble bee and a spider, and it's shot (and beautifully narrated) by London musician Keith John Adams.
The variance in male body size of T. plumipes is 44.4, twice that of other male spiders of similarly sized species. This is because smaller males are less likely to be detected and cannibalized by females before copulation, but larger males can exclude small males from the central hub of the web where mating takes place.
The term comes from the Greek γυνή (gynē) 'female', ἀνήρ (anēr) 'male', and μορφή (morphē) 'form', and is used mainly in the field of entomology. Gynandromorphism is most frequently recognized in organisms that have strong sexual dimorphism such as certain butterflies, spiders, and birds, but has been recognized in numerous ...
A male Eresus sandaliatus. Sexual selection in spiders shows how sexual selection explains the evolution of phenotypic traits in spiders.Male spiders have many complex courtship rituals and have to avoid being eaten by the females, with the males of most species surviving only a few matings and consequently having short life-spans.
Adult female marbled orbweavers have a body length of up to 14 mm or more, with a very large oval, sub-spherical abdomen. Adult males are smaller, with a body length of up to 7 mm. Two main color forms are found. A. marmoreus var. marmoreus has an orange abdomen with brown to black marbling. It usually has a distinct folium with dark edging.
Females can reach a body length of 22 mm, males up to 15 mm. This species is much darker than others of the same genus. While subadult spiders have a greyish opisthosoma with a marking similar to Segestria senoculata, adults are of a uniform black, sometimes with a green iridescent shine, especially on the chelicerae, [2] which reflect with a striking green.