Buscar

Mostrando ítems 1-10 de 241

Sperm morphometric in males of the paper wasp Polistes simillimus

Universidade de São Paulo (USP); Universidade Federal de Viçosa (UFV); Universidade Estadual Paulista (Unesp) (Alma Mater Studiorum, Univ Bologna, 2018-06-01)

Intraspecific variation in sperm morphometric is widespread across animal taxa and it might be related to different aspects of sexual selection. Within social insects, it has only been documented for some bee and ant ...

Variability in sperm form and function in the context of sperm competition risk in two Tupinambis lizards

Blengini, Cecilia Soledad; Naretto, Sergio; Cardozo Milanesio, Gabriela Alejandra; Giojalas, Laura Cecilia; Chiaraviglio, Margarita (Wiley, 2014-10)

In polyandrous species, sperm morphometry and sperm velocity are under strong sexual selection. Although several hypotheses have been proposed to explain the role of sperm competition in sperm trait variation, this aspect ...

Sperm morphometric in males of the paper wasp polistes simillimus

Universidade de São Paulo (USP); Universidade Federal de Viçosa (UFV); Universidade Estadual Paulista (UNESP) (2018-01-01)

The Sperm Of Hylodinae Species (anura, Leptodactylidae): Ultrastructural Characteristics And Their Relevance To Interspecific Taxonomic Relationships.

Aguiar, O; Giaretta, A A; Recco-Pimentel, S M (2006)

Sperm competition and reproductive mode influence sperm dimensions and structure among snakes

Tourmente, Maximiliano; Gomendio, Montserrat; Roldan, Eduardo Danilo; Giojalas, Laura Cecilia; Chiaraviglio, Margarita (Wiley Blackwell Publishing, Inc, 2009-10)

The role of sperm competition in increasing sperm length is a controversial issue, because findings from different taxa seem contradictory. We present a comparative study of 25 species of snakes with different levels of ...

A hypothesis about the origin of sperm storage in the Eubrachyura, the effects of seminal receptacle structure on mating strategies and the evolution of crab diversity: How did a race to be first become a race to be last?

McLay, Colin L.; Lopez, Laura Susana (Elsevier Gmbh, 2011-10)

The origins and evolution of sperm storage in Brachyura are enigmatic: sperm is either stored in seminal receptacles, accessible via the vulvae on the sixth thoracic sternite, or in spermathecae at the border between the ...

From storage to delivery: Sperm volume and number of spermatozoa inside storage organs and ejaculates in males of Timogenes elegans (Scorpiones: Bothriuridae)

Vrech, David Eduardo; Olivero, Paola Andrea; Mattoni, Camilo Ivan; Peretti, Alfredo Vicente (American Arachnological Society, 2018-08)

Sperm competition influences the evolution of many reproductive traits such as gonads, sperm or genitalia. Many sperm competition analyses concentrate in testes and ejaculates. Among arachnids, scorpions constitute an ...

Diversity of chromatin condensation patterns, nuclear reorganization, evolution and phylogenetic distribution of sperm nuclear basic proteins in fish

Contreras, Pablo; Zamorano, Mauricio; Ulloa Rodriguez, Patricio; Beltran, Jorge F.; Risopatron, Jennie; Figueroa, Elias; Valdebenito, Ivan; Farias, Jorge G. (SPRINGER, 2021)

Differences in sperm morphology in foam-nesting leptodactyline frogs (Anura, Leptodactylidae)

Universidade Estadual Paulista (Unesp) (Wiley-Blackwell, 2017-01-01)

Sperm morphology is diverse among vertebrates and is influenced by the reproductive strategies adopted by species. In anurans, sperm morphology is associated with reproductive modes and mating systems. Here, we describe ...

Sperm ultrastructure and a new type of spermiogenesis in two species of Pimelodidae, with a comparative review of sperm ultrastructure in Siluriformes (Teleostei : Ostariophysi)

Quagio-Grassiotto, Irani; Oliveira, Claudio (Elsevier Gmbh, Urban & Fischer Verlag, 2014)

1
2
3
4
. . .
25