Results 121 to 130 of about 15,807 (147)

Genetic Diversity, Species Phylogeny and Historical Biogeography of the Aquarius paludum Group (Heteroptera: Gerridae)

open access: yesInsect Systematics and Evolution, 2003
We investigated genetic diversity and phylogeny of all water strider species assigned to the Aquarius paludum species group on basis of 425 bp DNA sequence data from the mitochondrial gene encoding cytochrome oxidase subunit I (COI).
Herbert Zettel, Jakob Damgaard
exaly   +3 more sources
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Sensitive Stages in the Photoperiodic Determination of Wing Forms and Reproduction in the Water Strider, Aquarius paludum (Fabricius)

open access: yesZoological Science, 1997
Abstract The present work was performed to clarify the photosensitive stage for wing-form determination and reproduction in Aquarius paludum. Only 40–60% of the adults were long winged when they were reared under 12 hr light-12 hr dark (12L-12D) during the first two instars and under 15.5L-8.5D during the rest of nymphal stage. However, all became long-
Tetsuo Harada
exaly   +2 more sources

Polyandry, multiple mating, and female fitness in a water strider Aquarius paludum

Behavioral Ecology and Sociobiology, 2009
Contrary to Bateman’s principle, polyandry appears to be a common female mating strategy. Several hypotheses have been proposed to explain the evolution of polyandry. It is assumed that females gain either material or genetic benefits from multiple matings, or that they are coerced into mating by males. In water striders, mating is generally assumed to
Katri Ronkainen   +2 more
openaire   +1 more source

Morphology and neurophysiology of tarsal vibration receptors in the water strider Aquarius paludum (Heteroptera: Gerridae)

Journal of Insect Physiology, 2009
Substrate vibratory information receptors are extensively studied in insects and spiders, however for water surface dwelling species little data is available. We studied the vibration receptive organs in tarsi of the water strider Aquarius paludum, using light, transmission and scanning electron microscopes, and recorded the neural activity of the ...
Pablo, Perez Goodwyn   +2 more
openaire   +2 more sources

Role of body size in dominance interactions between male water striders, Aquarius paludum

Journal of Ethology, 2009
Water striders are a model system for the study of sexual size dimorphism, but the effect of body size on the dominance relationship between individuals has not been experimentally tested. In 34 staged contests between males of the water strider Aquarius paludum, we determined the effect of body size difference between contestants on the outcome of the
Chang S. Han, Piotr G. Jablonski
openaire   +1 more source

How do water striders, Aquarius paludum, react to brackish water simulated by NaCl solutions?

Naturwissenschaften, 2005
Several stages, from eggs to adults, of the water strider, Aquarius paludum (Fabricius), inhabiting fresh water are sometimes conveyed by heavy flow in the rainy or typhoon seasons in Japan to lotic brackish water in the mouth of rivers. The water striders might then respond to salinity either by remaining to wait for extensive rainfall to reduce ...
Manabu, Kishi   +2 more
openaire   +2 more sources

Cost of oviposition site selection in a water strider Aquarius paludum insularis: Egg mortality increases with oviposition depth

Journal of Insect Physiology, 2010
Females generally avoid selecting sites for oviposition which have a high predation risk to increase offspring survival. Previous studies have focused on costs to ovipositing females. However, although offspring may also incur costs by being oviposited at low predation risk sites, no studies have focused on costs to offspring.
Hiroyuki, Hirayama, Eiiti, Kasuya
openaire   +2 more sources

The oviposition process in two direct breeding generations in a water strider, Aquarius paludum (Fabricius)

Journal of Insect Physiology, 1992
Abstract In the first generation (nymphal stage, about 20°C on average in Kochi) of a water strider, Aquarius paludum (Fabricius), the preoviposition period was longer than in the second generation (> 27°C) in both macropterous and brachypterous forms under natural conditions.
openaire   +1 more source

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