Arcadiajohn wrote:Answering the questions about light and the canopy, good timing really I have a book coming out entitled lighting for understory species. There is a whole section on dendros in the book. I will quickly explain my findings from the research papers available.if we take all light as 100%, after all absorption from atmosphere and clouds and canopy, the average % of total light making it's way down through emergent, into the canopy and then into the understory via leaf scatter would be about 4-6%. Any shiney or wet surfaces would reflect light and Uv back up into the ecosystem, this could mean that this energy is reusable to animals with adapted skin for absorbing low levels. This is a surprising amount, now we all know that different frogs come from different elevations, the trick is to match your captive environment to the wild. So a species from a higher altitude is provided with more mws2. Dendros are as we all know able to see UV. This is a godsend for them and us! It simply means that we can use higher powered T5 lamps over a small area in the enclosure, decorate the enclosure accordingly so that the frogs can photoregualte from say 40-50cms at the furthest point to 15-20cms at a basking platform, the frogs are the experts!!! They are able to photoregualte very well, they will move in the enclosure to get what they need, when they need it. I would be far happier providing high levels of UV over two thirds of the enclosure even for 6 hours a day and letting the frogs regulate themselves than using a low powered lamp over a wider area for longer! Cool and shade is just as important to the chemical changes in the body as heat, light and UV. Ideally we should all be providing light and shade. We keep bumblebee toads in the office here, they come from a high altitude and are very diurnal, so no supprise that they sit 10cms under a very powerful lamp for sessions of about 10 mins at a time at least 3 or 4 times a day! This is providing around 40-60mws2 with that lamp at that distance. I hope this is helpful!, John.
Just a thanks Jon for everything,ha ha do how you find the time mate!! Great to see you here,and to have your wisdom on this subject,which as you know i believe is so important to our frogs.It never ceases to amaze me that everytime you write something i seem to learn something new,i had no idea that our darts could see UVB!!!!!