Every January, once the confetti has settled from the new year’s celebration, I start thinking a lot about amphibians and preparing for their springtime migration. That behavior, however, is not collectively adopted by all of our local frogs and salamanders. Different species have found different ways to adapt to the challenges of a complex lifecycle that relies on environmental factors to inform physiological changes. Wood frogs, as well as spotted and Jefferson salamanders, have conformed to an early spring breeding strategy. Once the ground thaws and snow melt has raised the water level in vernal pools, they are on the move. Since amphibians in temperate climates hibernate (or more correctly, brumate – the “cold-blooded” equivalent), you might think that their appearance in February and March means that they lead the pack. While this seems a reasonable assumption, it’s actually incorrect.
Biologists and volunteers survey for New Jersey Eastern Tiger Salamanders
by Larissa Smith, biologist/volunteer manager
It’s the time of year when Conserve Wildlife Foundation biologists and volunteers along with Endangered and Nongame Species biologists start to survey for New Jersey’s “tigers,” and by tigers I don’t mean the big striped cats, we’re talking about the Eastern Tiger Salamanders. These large mole salamanders spend most of their life burrowed under the ground and in December begin to emerge to migrate to vernal pools and breed. Eastern Tiger Salamanders are endangered in New Jersey and only found in 15 pools in the most southern part of the state.
Last week dedicated volunteers Wayne Russell, John King and myself went out to check on a few known breeding pools. The water level in the ponds was lower than usual due to the lack of rain, but John found an adult male in one of the pools.
Tiger Salamander found 12/9/15 Photo by W. Russell
We were delighted to find a male in the pool so early in December. At another known breeding pool we found the partial remains of two Eastern Tiger Salamanders that had obviously been eaten by a predator. But the good news was that we also found two tiger salamander egg masses in the same pool.
Predation is just one of the challenges that these salamanders face. Tiger Salamanders themselves are targeted by collectors for the pet trade which is why their breeding locations are kept a secret. Their habitat is declining due to habitat loss and fragmentation, development, pollution, changes in hydrology, and climate change.
Studying the New Jersey Endangered Eastern Tiger Salamander
Conserve Wildlife Foundation is excited to celebrate Amphibian Awareness Month during March 2015! Follow us on social media and be sure to check your email (sign up for our list) for weekly stories on the amphibians of the Garden State and our work to protect them.
Biologists and volunteers go out to pools during the winter months to survey for egg masses to determine if the pools are being used by Tiger Salamanders. The cold winter made getting out to pools difficult due to the ice cover, so now that it is warming up we hoped to still be able to find egg masses that hadn’t yet hatched.
Surveying for Tiger Salamander egg masses
One hundred sixty egg masses were found in the largest pool, some the of eggs had already hatched but others were still intact. Tiger Salamander larvae was seen along with the larvae of the Marbled Salamander. Vernal pools are breeding grounds for many species which is why it is so important to protect them.
Marbled Salamander larvae @ Pat Sutton
In New Jersey, there are only 15 known Tiger Salamander breeding pools in the southern most part of the state. Tiger Salamanders themselves are targeted by collectors for the pet trade which is why their breeding locations are kept a secret. Their habitat is declining due to habitat loss and fragmentation, development, pollution, changes in hydrology, and climate change.
To see what biologists are doing to protect them visit:
