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Painted turtles, male, female, new research

Originally posted on Dear Kitty. Some blog: This 6 May 2018 video from the USA says about itself: In this video I will show you these cute amazing baby painted turtles. These baby turtles are only 1 day old and are so tiny, some of these baby turtles are the size of quarters and smaller. I saved the baby painted turtles from birds and at the end of the video I will let these turtles go. From Iowa State University in the USA: How scientists view sex determination in painted turtle populations August 6, 2019 Summary: A study that looks at how temperature influences the development of painted turtles may lead biologists to rethink the theoretical frameworks they use when analyzing the topic. The study found wide variation within local populations, suggesting temperature sensitivity of embryonic development can vary significantly from one turtle nest to another within a single population. A new study from Iowa State University scientists could flip the established framework for how scientists believe geography influences sex determination in painted turtles on its shell. The study, published Tuesday in the academic journal Functional Ecology, analyzed decades of data concerning painted turtles, a species widely distributed across North America that undergoes temperature-dependent sex determination. That means the temperatures experienced by an incubating painted turtle egg influence whether an embryo develops the physical characteristics biologists describe as male or female. Warmer temperatures tend to produce females, and cooler…

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40,000 bluebirds housed in Idaho, USA

Originally posted on Dear Kitty. Some blog: This 25 July 2019 video from the USA says about itself: The Birdman of Idaho Has Built Homes for Over 40,000 Bluebirds He just might be the biggest bluebird landlord in Idaho. Al Larson has built and placed more than 350 wooden nest boxes throughout the state’s southwest. The birdwatcher started the project in the late 1970s after reading how important the shelters are to the survival of bluebirds. Today, at the age of 97, he is still at it. Larson monitors the little houses to record vital data about the number of eggs and nestlings. To date, Larson has helped fledge over 40,000 bluebirds.

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Plant evolution and gravity, new research

Originally posted on Dear Kitty. Some blog: This October 2016 video, in English with Brazilian Portuguese subtitles, says about itself: Short video explaining a few key facts and concepts on land plant evolution from a phylogenetic perspective. From the Institute of Science and Technology Austria: When plant roots learned to follow gravity Scientists identify key evolutionary steps of gravity-directed root growth August 2, 2019 Summary: Highly developed seed plants evolved deep root systems that are able to sense Earth’s gravity. The ‘how and when’ of this evolutionary step has, until now, remained unknown. Plant biologists have identified crucial components and processes which only developed in seed plants around 350 million years ago to enable fast and efficient gravity-driven root growth. One of the most important events in evolutionary history occurred around 500 million years ago with the spread of plant life from water to land. For plants to thrive in this new environment, root systems had to evolve to grow downwards, following gravity with two primary purposes: anchoring in the soil and providing a source of water and nutrients for growth of the parts of the plant above the ground. This mechanism — called gravitropism — has been extensively studied in flowering plants such as Arabidopsis thaliana. However, it has never been systematically compared throughout the plant kingdom, and its evolutionary origin remains a mystery. Down, down, down — but at different speed Now, Yuzhou Zhang, postdoc in the…

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