Habitat suitability mapping highlighted (1) the influence of deep-water overwintering wetlands on suitable habitat for four of five anuran species encountered; (2) the lack of overlap between areas of core habitat for both the northern leopard frog and wood frog compared to the core habitat for both toad species; and (3) the importance of conservation programs in providing grassland components ...

Metamorphosis of anuran tadpoles is controlled by thyroid hormone (TH). Here we demonstrate that transgenic Xenopus laevis tadpoles expressing a dominant negative form of TH receptor-alpha are resistant to a wide variety of the metamorphic changes induced by TH. This result confirms that TH receptors mediate both early and late developmental programs of metamorphosis as diverse as growth in the...

A low molecular weight, basic, nonpeptidic factor that possesses sodium transport inhibitory properties has been prepared from bovine hypothalamus by acid/acetone extraction and gel filtration. Concentration and partial purification was achieved by ion-exchange chromatography. This substance inhibits active Na+ transport across anuran membranes, inhibits ouabain binding to frog urinary bladder,...

Researchers have reported that the phenolic antioxidants vitamin E and butylated hydroxyltoluene (BHT) effect on cultured cells and human low-density lipoprotein is disrupted by various synthetic chemical compounds and Cu2+ involved in reactive oxygen species (ROS) generation by redox reaction. In this paper, information involved in prooxidative action of vitamin E and BHT in cultured anuran le...

The time series of dates the end wintering and beginning spawning migrations marsh frog in valley middle reaches Medveditsa river (Don basin, Saratov region) was analyzed. It has been established that period from 1892 to 2021, phenological norm this phase annual cycle shifted earlier by an average 6 days (from May 2 April 26) against background climate warming. Possible consequences transformat...

Occupancy models that account for imperfect detection are often used to monitor anuran and songbird species occurrence. However, presence–absence data arising from auditory detections may be more prone to observation error (e.g., false-positive detections) than are sampling approaches utilizing physical captures or sightings of individuals. We conducted realistic, replicated field experiments u...