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Trade-offs in male display activity with lek size
(2016-09-01)
In lek mating systems, males aggregate and defend arenas where they display for females; females select and mate with a male and then solely raise their offspring. Generally, female visits and copulations increase and ...
Males of Neotropical social wasps (Vespidae, Polistinae, Epiponini) recognize colonies with virgin females
(Pensoft Publ, 2014-01-01)
Male behavior of Neotropical swarm-founding wasps has rarely been observed. The few published observations about male activities only describe their behavior during the short period they spend inside nests. In consequence, ...
Territoriality and male-biased sexual size dimorphism in Argia reclusa (Odonata: Zygoptera)
(SPRINGER HEIDELBERGHEIDELBERG, 2012)
In Odonata, many species present sexual size dimorphism (SSD), which can be associated with male territoriality in Zygoptera. We hypothesized that in the territorial damselfly Argia reclusa, male-male competition can favor ...
Ascorbic acid co-administered with rosuvastatin reduces reproductive impairment in the male offspring from male rats exposed to the statin at pre-puberty
(2018-08-01)
Obesity during childhood and adolescence is closely related to dysfunctions on lipid profile in children. Rosuvastatin is a statin that decreases serum total cholesterol. Ascorbic acid is an important antioxidant compound ...
Burrow ornamentation in the fiddler crab (Uca leptodactyla): female mate choice and male–male competition
(2016-09-02)
Non-biological ornamentation is found in the nests and burrows of different kinds of animals. We evaluated here whether sand hoods constructed by male fiddler crabs (Uca leptodactyla) are one of the signals used by males ...
Perinatal exposure to parasiticide ivermectin: Long-term effects on reproductive parameters of adult male rats
(2011-02-01)
Ivermectin is one of the most widely used antiparasitic drugs globally. The aim of this study was to evaluate the chronic effects of perinatal exposure to ivermectin on male reproductive parameters in rats. Pregnant rats ...
Fertility of male adult rats submitted to forced swimming stress
(Associação Brasileira de Divulgação Científica (ABRADIC), 2003-05-01)
We investigated whether stress interferes with fertility during adulthood. Male Wistar rats (weighing 220 g in the beginning of the experiment) were forced to swim for 3 min in water at 32ºC daily for 15 days. Stress was ...
Prenatal exposure to ethinylestradiol alters the morphologic patterns and increases the predisposition for prostatic lesions in male and female gerbils during ageing
(2016-02-01)
Ethinylestradiol (EE) is an endocrine disruptor (ED) which acts as an oestrogen agonist; this compound is known as an oral contraceptive. Male and female rodents exposed to EE during critical time points of development, ...
Breeding activity of the neotropical treefrog Hyla elegans (Anura, Hylidae)
(1996-12-01)
Breeding of Hyla elegans was monitored from August 1991 to July 1992 at a temporary pond in Ubatuba, State of Sao Paulo, southeastern Brazil. Males began to call as they entered the chorus, and defended their calling sites ...