When your environment is clean you feel happy motivated and healthy.
~Lailah Gifty Akita
I mentioned in an earlier post that we finally got around to cleaning out our two water gardens (aka salamander pools) in November. One had sprung a leak mid-way up its height a couple of years ago. It still held enough water for some critters but was choked with duckweed. The other sprung a leak this fall and drained, leaving a mud flat and lots of aquatic vegetation and their tangled root mats. These liners have been in for over 20 years (they are typically rated for 10) so I consider us lucky. We have a fairly narrow window for pond repairs as I want it to be late enough that cold weather has set in and numbed any Copperheads that might be hanging out in the rock walls, but before the Spotted Salamander breeding season, which can start as early as late December some years. I checked prices locally and online and purchased the liners at a place in Raleigh (prices have increased in 20 years!). I won’t bore you with the details, but I was pleased it only took us about a day each to totally re-do each pond, including cleaning out all the muck, putting in the new liner, and rebuilding and stabilizing their rock walls.
After getting the liners in place, the difficult part is rebuilding a sturdy rock wall around each pond. Years ago, I purchased some flat rocks and then filled in with the irregular shaped stones that are so abundant on the property.
The waterfall pool is great because we can hear the moving water from our screen porch so I like to think I am somewhere in the mountains when I hear it. The real advantage is as a possible additional attractant for birds (they love the sound of moving water), especially the neo-tropical migrants that move through our woods, so we will see what this season brings.
Our first good salamander rainfall didn’t occur until mid-February. We had a small run of salamanders and we ended up with about ten egg masses. About a month later we had a couple more nights of perfect weather for salamanders, and the bottoms of both pools were covered with spermatophores, followed a couple of nights later by lots of egg masses.
I’ve been keeping tabs on the development of the eggs in the two pools over the last few weeks. Most have turned greenish in color due to the presence of an algae that is specific to Spotted Salamander egg masses. The algae probably gain nutrients like nitrogen from the waste products of the developing larvae and the larvae probably get oxygen from the photosynthesizing algae. Egg hatch time is temperature dependent and usually takes 4 to 6 weeks.
The gel matrix holding the egg mass together starts to break down close to the time of hatching. I went out last week and lifted some of the twigs holding the egg masses and the jelly blobs started to fall apart. I gently placed one in a clear container and went inside to get my phone to photograph it. By the time I returned, there was a lot of activity in the container. Here is a quick video clip…
If you pause the video and look closely, you can see the tiny straight appendages dangling down near the head that serve as balancers for the newly hatched larva (there are also branched external gills at the head). After a couple of days, the balancers are reabsorbed when the larva is stronger and can swim and maintain an upright position in the water column.
I dipped in the pool yesterday and found one larva that has grown considerably and is now an active swimmer. Here’s hoping that many of them survive and transform into terrestrial juveniles in a couple of months. I look forward to their return on some cold and rainy nights in the years to come.