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Geographical variation in egg size dimorphism in rockhopper penguins
(Springer, 2010-04)
All crested penguins present a unique reversed hatching asynchrony: the larger second-laid egg (B-egg) hatches before the smaller first-laid egg (A-egg). Although both eggs often hatch, the A-chick generally dies of ...
Compensatory effect of egg size dimorphism on hatching asynchrony in Magellanic penguin
(Wiley Blackwell Publishing, Inc, 2021-07)
Egg laying is one of the most important phases in a female bird’s breeding cycle. Its cost is high because eggs contain all the resources needed for the development of an embryo. Variation in size and quality of eggs can ...
Reproductive ecology of dipsadine snakes, with emphasis on South American species
(HERPETOLOGISTS LEAGUE, 2008)
A relatively large amount of variation occurs in the reproductive ecology of tropical snakes, and this variation is generally regarded as being a consequence of seasonality in climate and prey availability. In some groups, ...
Contrasting patterns of sexual size dimorphism in the grasshoppers Dichroplus vittatus and D. pratensis (Acrididae, Melanoplinae)
(Orthopterists' Society, 2008-12)
Sexual size dimorphism (SSD) can be the result of sexual selection (SS) or natural selection (NS). Due to male-male competition for access to females, SS could favor an increase in male body size. On the other hand, larger ...
Sexual dimorphism in the shell of a nassariid gastropod. A 3D geometric morphometrics approach
(Cambridge University Press, 2017-03)
Among gastropods, dimorphism is reported in shell size, radular characteristic, and to a lesser extent in shell shape. The relationship of dimorphic characters of the shell with spawning is scarcely studied in literature. ...
Egg-laying site, fecundity and degree of sexual size dimorphism in frogs
(Oxford Univ Press, 2020-11-01)
Female fecundity is an important selective force leading to female-biased sexual size dimorphism (SSD) in frogs. Because anurans exhibit diverse reproductive modes, we investigated whether variation in SSD and fecundity ...
Male-male competition and repeated evolution of terrestrial breeding in Atlantic Coastal Forest frogs*
(2020-02-01)
Terrestrial breeding is a derived condition in frogs, with multiple transitions from an aquatic ancestor. Shifts in reproductive mode often involve changes in habitat use, and these are typically associated with diversification ...
Reproduction and activity of the snail-eating snake, Dipsas albifrons (Colubridae), in the Southern Atlantic Forest in Brazil
(Swets Zeitlinger Publishers, 2002-08-01)
The reproduction and activity of Dipsas albifrons (Sauvage, 1884) from the southern Atlantic Forest, Brazil, were studied by analysing 144 preserved specimens. Females attained larger body sizes than males. Contrary to ...
Reproductive biology of the nest building vizcacheras frog Leptodactylus bufonius (Amphibia, Anura, Leptodactylidae), including a description of unusual courtship behaviour
(British Herpetol Soc, 2017-01-01)
We describe the reproductive biology and sexual size dimorphism of a population of the vizcacheras frog Leptodactylus bufonius in the Brazilian Chaco. Reproduction takes place during the rainy months (September-March). ...
Reproductive biology of the nest building vizcacheras frog Leptodactylus bufonius (Amphibia, Anura, Leptodactylidae), including a description of unusual courtship behaviour
(2017-01-01)
We describe the reproductive biology and sexual size dimorphism of a population of the vizcacheras frog Leptodactylus bufonius in the Brazilian Chaco. Reproduction takes place during the rainy months (September–March). ...