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Evidence for differential maternal allocation to eggs in relation to manipulated male attractiveness in the pied flycatcher (Ficedula hypoleuca)
(SPRINGER, 2006-10)
We present evidence of differential maternal allocation to eggs in response to manipulated male attractiveness in the migratory pied flycatcher (Ficedula hypoleuca). We manipulated the size of a male secondary sexual trait, ...
Loss of male secondary sexual structures in allopatry in the Neotropical butterfly genus Arcas (Lycaenidae: Iheclinae: Eumaeini)
(APOLLO BOOKSSTENSTRUP, 2012)
Male secondary sexual characters in Lepidoptera may be present or absent in species that otherwise appear to be closely related, an observation that has led to differences of opinion over the taxonomic usefulness of these ...
Moenkhausia andrica (Characiformes: Characidae): a new species from the rio Tapajós basin, Brazil, with minute fin hooklets in females
(2021-10-01)
In this study, a new species of Moenkhausia is described from the upper rio Juruena, rio Tapajós basin, Brazil. It is distinguished from all congeners by the presence of minute bony hooks in all fins of both mature females ...
Morphometric analysis of the mud crab Hexapanopeus paulensis Rathbun, 1930 (Decapoda, Xanthoidea) from the southeastern coast of Brazil
(Pontificia Universidad Católica de Valparaíso, 2017)
Allometry of the secondary sexual characters of the shore crab Pachygrapsus transversus (Gibbes, 1850) (Brachyura, Grapsidae)
(Brill Academic Publishers, 1999-12-01)
The allometric growth of secondary sexual characters in Pachygrapsus transversus is investigated from the 2(nd) crab stage onward. Clear sexual dimorphism is restricted to abdominal morphology, but ANCOVA analyses showed ...
From erotic excrescences to pheromone shots: structure and diversity of nuptial pads in anurans
(Wiley Blackwell Publishing, Inc, 2018-05)
The nuptial pad is a secondary sexual character found in anuran amphibians. It includes modified epidermal and dermal tissues and is usually located on the first digit of the hand of males. In this study, we review the ...
Male reproductive traits of the marine snail Buccinanops deformis (King, 1832), (Gastropoda: Nassariidae): Size and age at maturity and sperm morphology
(Elsevier Gmbh, 2017-07)
Size and age at sexual maturity in males was studied in Buccinanops deformis through analysis of gonadal tissue samples, secondary sexual characters and mating behavior in Golfo San Matías, Patagonia. Gonadal maturity ...
Morphometric analysis of the mud crab Hexapanopeus paulensis Rathbun, 1930 (Decapoda, Xanthoidea) from the southeastern coast of BrazilAnálisis morfométrico del cangrejo de fango Hexapanopeus paulensis Rathbun, 1930 (Decapoda, Xanthoidea) del litoral sureste de Brasil
(2014-01-01)
In this study, we estimated the size at onset of maturity (carapace width, CW50) and analyzed the relative growth of some body parts and the heterochely of the mud crab Hexapanopeus paulensis. A total of 800 crabs were ...
Bone mineralization among male adolescents: Critical years for bone mass gain
(2004-12-01)
Objective: To verify the behavior of the mineral bone content and density in male adolescents according to age and secondary sexual characters. Methods: 47 healthy adolescents between 10 and 19 years old were assessed ...