Ecology and Society, 2009 A key goal in road ecology is to determine which species are most vulnerable to the negative effects of roads on population persistence. Theory suggests that species that avoid roads are less likely to be negatively affected by roads than those that do ...
Julie Bouchard +3 more
doaj +1 more source
Oocyte maturation in the toad Rhinella arenarum (Amphibia, Anura): Evidence of cAMP involvement in steroid production and action [PDF]
, 2018 In this work, we describe the participation of the adenylate cyclase/3′-5′-cyclic adenonsine monophosphate (cAMP) pathway in the seasonal follicular secretion of progesterone (P 4 ) and testosterone (T), and its relationship with the maturation of ...
Arias Torres +48 more
core +1 more source
AMPHIBIAN RESPONSE TO A LARGE-SCALE HABITAT RESTORATION IN THE PRAIRIE POTHOLE REGION [PDF]
, 2016 Over the next half-century, scientists anticipate that nearly one third of the currently recognized 7,450 amphibian species will become extinct. Many organizations have responded to the challenge of conserving amphibian biodiversity, some indirectly ...
Hawkins, Michael J. +4 more
core +2 more sources
An amphibian species of concern prefers breeding in active beaver ponds
Ecosphere, 2016 Changes in water availability threaten to reduce suitable habitat for wildlife in the western United States. Ecosystem engineers, such as beavers (Castor canadensis), potentially mitigate the effects of such habitat changes, particularly in stochastic ...
Victoria H. Zero, Melanie A. Murphy
doaj +1 more source
Characterization of atrazine-induced gonadal malformations in African clawed frogs (Xenopus laevis) and comparisons with effects of an androgen antagonist (cyproterone acetate) and exogenous estrogen (17beta-estradiol): Support for the demasculinization/feminization hypothesis. [PDF]
, 2006 Atrazine is a potent endocrine disruptor that both chemically castrates and feminizes male amphibians. It depletes androgens in adult frogs and reduces androgen-dependent growth of the larynx in developing male larvae.
Collins, Atif +8 more
core +2 more sources
Reproductive Biology and Endocrinology, 2005 Background Gonadal steroids, in particular 5 alpha-dihydrotestosterone (DHT) and 17 beta-estradiol (E2), have been shown to feed back on the hypothalamic-pituitary-gonadal (HPG) axis of the ranid frog.
Jones Jeremy T +3 more
doaj +1 more source
RESPIRATION OF HOMOGENIZED EMBRYOS: RANA PIPIENS AND RANA PIPIENS ♀ x RANA SYLVATICA ♂
The Biological Bulletin, 1957 1. The respiration of phosphate-buffered cell-free homogenates made from R. pipiens embryos increases exponentially with the age of the embryos up until the time at which they are in the tailbud stage, after which the rate declines.2. Addition of 0.2% sodium deoxycholate elevates the respiration of homogenized embryos at any pre-tailbud stage to that ...
JOHN R. GREGG, FRANCES L. RAY
openaire +2 more sources
Amphibian chytridiomycosis : a review with focus on fungus-host interactions [PDF]
, 2015 Amphibian declines and extinctions are emblematic for the current sixth mass extinction event. Infectious drivers of these declines include the recently emerged fungal pathogens Batrachochytrium dendrobatidis and Batrachochytrium salamandrivorans ...
Haesebrouck, Freddy +3 more
core +4 more sources
Progesterone-induced changes in the phosphoryl potential during the meiotic divisions in amphibian oocytes: Role of Na/K-ATPase [PDF]
, 2011 Background Progesterone triggers resumption of the first meiotic division in the Rana pipiens oocyte by binding to the N-terminal external loop of the catalytic subunit of Na/K-ATPase, releasing a cascade of lipid second messengers.
Adele B Kostellow +3 more
core +2 more sources