Interacting with the EGU displays: Choose your own adventure!

<p>You log on to a computer in a dimly lit room. The screen shines with a yellowish, night-setting tint since you discovered that it’s more comfortable for your eyes that way. You sift through the many, many open windows, documents and spreadsheets, looking for the one — the one you know will take you to the next level: the browser window. Finding it, you nervously type in the address that had been whispered to you through the ether (of social media, email and video chats)…</p> <p> </p> <p><strong>Which one do you type?</strong></p> <p>www.egu2020.eu (<em>go to paragraph 2</em>)</p> <p>https://egu2020.eu/sharing_geoscience_online/ (<em>go to paragraph 2</em>)</p> <p>As you enter the text into the browser window, you are thrust, sci-fi style, through a glowing tunnel of light as your roommate enters the room and turns on the annoyingly bright overhead light. After you turn it off and they apologise by making you a hot beverage, you return to the screen and notice an icon – your #shareEGU20 material that you uploaded last week now has a comment!</p> <p> </p> <p><strong>What do you do?</strong></p> <p>Click on the comment notification email (<em>go to paragraph 3</em>)</p> <p>Navigate to your abstract and click on the speech bubble icon (<em>go to paragraph 3</em>)</p> <p>You click. Straight away the comment pops up – someone likes your work! They want to collaborate with you on an idea sparked by your material, and <em>it sounds like there is funding!</em></p> <p> </p> <p><strong>What do you do next?</strong></p> <p>Reply to the comment (<em>go to your material upload</em>)</p> <p>Web search the person, then reply to the comment (<em>go to your personal programme</em>)</p> <p>Get up, do a little happy dance, then reply to the comment (<em>go to the short courses playlist on Youtube</em>)</p> <p>This is the beginning of a big adventure. Throughout the week of #shareEGU20 and beyond, we are providing a range of ways for you to interact about your research with the global Earth, planetary and space science community. You will have to choose which one works for you, be it commenting on your material, live chat during your session slot, or discussions on social media using one of our official hashtags. Whichever method you choose, we hope you’ll reach out to others and discuss your ideas.</p> <p>I’m sure you will choose well, DARING ADVENTURER!</p>

Further Observations on the Response of Rainbow Trout, Salmo gairdneri, to Overhead Light

The response of rainbow trout (Salmo gairdneri Richardson) to overhead light changed with the growth of the fish. No response was evident until the age of 7 months, after which the response became more pronounced with age. Trout exhibited a significant preference for the darkest chamber when given a choice of five intensities of artificial light. Minimum light threshold for 10-month-old fish was between 0.01 and 0.005 lux. However, 24-month-old fish had a lower level of light threshold between 0.005 and 0.001 lux.

A laboratory study of vertical migration

In a tank filled with a suspension of indian ink in tap water, a population of Daphnia magna will undergo a complete cycle of vertical migration when an overhead light source is cycli­cally varied in intensity. A ‘dawn rise’ to the surface at low intensity is followed by the descent of the animals to a characteristic maximum depth. The animals rise to the surface again as the light decreases, and finally show a typical midnight sinking. The light intensities at the level of the animals in this experiment are of the same order as those which have been reported in field observations; the time course of the movement also repeats the natural conditions in the field. The process is independent of the duration of the cycle and is related only to the variation in overhead light intensity. At low light intensity the movement of the animal is determined solely by positive photo-kinesis; the dawn rise is a manifestation of this, and is independent of the direction of the light. At high light intensities there is an orientation response which is superimposed upon an alternating positive (photokinetic) phase and a negative phase during which movement is inhibited. The fully oriented animal shows a special type of positive and negative phototaxis, moving towards the light at reduced light intensities and away from it when the light intensity is increased. In this condition it follows a zone of optimum light intensity with some exactness. Experiments show that an animal in this fully oriented condition will respond to the slow changes of intensity characteristic of the diurnal cycle, while being little affected by tran­sient changes of considerable magnitude.