Results 31 to 40 of about 1,828 (138)

Morphological analysis and description of the ovaries of female silky sharks, Carcharhinus falciformis (Müller & Henle, 1839) [PDF]

, 2013
This work aims to study the female reproductive tract of silky sharks, Carcharhinus falciformis, captured in the South and Equatorial Atlantic Ocean.
Carrier J. C., Castro J. A., Coelho R., Davenport I. R., Dodd J. M., Fernanda O. Lana, Fábio H. V. Hazin, Hamlett W. C., Hamlett W. C., Hazin F. H. V., Joaquim Evêncio Neto, Keilla Regina L. S. Torres, Koob T. J., Maria Goretti Soares, Mariana G. Rêgo, Matthews L. H., Natália L. Santos, P. G. V. Oliveira, Pollyana C. G. Roque, Pratt H. L., Rui Coelho, Stehmann M. F. W., Teshima K., Wourms J. P., Wourms J. P.   +24 more
core   +2 more sources

Molecular mechanism of nutrient uptake in developing embryos of oviparous cloudy catshark (Scyliorhinus torazame)

PLoS ONE, 2022
Forms of embryonic nutrition are highly diverse in cartilaginous fishes, which contain oviparity, yolk-sac viviparity and several types of matrotrophic viviparity (histotrophy, oophagy, and placentotrophy). The molecular mechanisms of embryonic nutrition
Yuki Honda, Nobuhiro Ogawa, Marty Kwok-Shing Wong, Kotaro Tokunaga, Shigehiro Kuraku, Susumu Hyodo, Wataru Takagi   +6 more
doaj   +3 more sources

Demography Meets Climate Change: Life History Challenges for a Neotropical Viviparous Lizard. [PDF]

Ecol Evol
Considering the current biodiversity crisis, it is crucial to understand the impact of global environmental changes on natural populations. Analyzing demographic parameters from long‐term studies is the most effective approach to uncovering patterns that describe population dynamics.
Santos MLG, de Sousa HC, Machado LPC, Colli GR.   +3 more
europepmc   +2 more sources

Skrjabinelazia rizzoi n. sp. (Nematoda: Seuratoidea) from a Sicilian lacertid, with comments on specific and biological diversity in the genus

Parasite, 2008
Skrjabinelazia rizzoi n. sp. (Seuratoidea), from Podarcis sicula captured at Cammarata, Agrigento Province, Sicily, is distinct from the 13 known species of the genus, including Skrjabinelazia sp. Rizzo from Catania.
Lhermitte N., Bain O., Virga A.
doaj   +1 more source

Zygoparity and sex steroid hormone profiles in bluemouth Helicolenus dactylopterus [PDF]

, 2017
Two hundred and seven individuals (103 females and 104 males) of bluemouth Helicolenus dactylopterus (Scorpaeniformes, Sebastidae), a commercially important deep-water species with an unusual reproductive strategy, from the eastern Atlantic Ocean ranging
Barcellos, Brown-Peterson, Canario, Dahle, Eldridge, Grier, Grier, Guerreiro, Howell, Hureau, Kime, Kobayashi, Liley, Matsuyama, Muñoz, Muñoz, Nagahama, Rinchard, Schulz, Scott, Sequeira, Sequeira, Sequeira, Sequeira, Shimizu, Shinomiya, Takano, Vila, Wallace, West, Wourms   +30 more
core   +1 more source

Evolutionary transitions in body plan and reproductive mode alter maintenance metabolism in squamates

BMC Evolutionary Biology, 2018
Background Energy (resources) acquired by animals should be allocated towards competing demands, maintenance, growth, reproduction and fat storage. Reproduction has the second lowest priority in energy allocation and only is allowed after meeting the ...
Lin Zhang, Kun Guo, Guang-Zheng Zhang, Long-Hui Lin, Xiang Ji   +4 more
doaj   +1 more source

Does the oviparity-viviparity transition alter the partitioning of yolk in embryonic snakes?

BMC Evolutionary Biology, 2017
Background The oviparity-viviparity transition is a major evolutionary event, likely altering the reproductive process of the organisms involved. Residual yolk, a portion of yolk remaining unutilized at hatching or birth as parental investment in care ...
Yan-Qing Wu, Yan-Fu Qu, Xue-Ji Wang, Jian-Fang Gao, Xiang Ji   +4 more
doaj   +1 more source

Viviparous mothers impose stronger glucocorticoid‐mediated maternal stress effects on their offspring than oviparous mothers

Ecology and Evolution, 2021
Maternal stress during gestation has the potential to affect offspring development via changes in maternal physiology, such as increases in circulating levels of glucocorticoid hormones that are typical after exposure to a stressor.
Kirsty J. MacLeod, Geoffrey M. While, Tobias Uller   +2 more
doaj   +1 more source

Terrestrial gastropods - how do they reproduce? [PDF]

Invertebrate Survival Journal, 2017
Molluscs are the most diverse group in respect of sexual systems and strategies. They can be dioecious with separate sexes or hermaphroditic. Within hermaphroditism, it is possible to distinguish a number of modifications of this type of reproduction ...
K S Zajac, P E Kramarz
doaj   +1 more source

Embryonic Growth and Yolk Depletion during Incubation in the Chinese Skink, Plestiodon chinensis [PDF]

, 2019
We collected 24 gravid female Chinese skinks (Plestiodon chinensis) to study embryonic growth and yolk depletion during incubation. Females laid eggs between late May and mid-June. Eggs were incubated at 24 (± 0.3) °C.
Kun GUO, Li MA, Shan SU, Xiang JI
core   +1 more source