Spotted Salamander
Ambystoma maculatum
Wyoming County, NY
Species
Salamanders as a group are moist skinned, four legged,
damp habitat animals. There are approximately 380 species of salamanders
on the planet, 18 of which are found in our range. Like all amphibians
salamanders secrete chemicals from their skin. These secretions can be
harmful to predators, toxic, or protect the salamander from desiccation
in a dry environment. These compounds are responsible for the slimy feel
of a salamander's skin. Many people have allergic reactions to handling
salamanders. Mostly the toxins affect the mucous membranes in the nose
and eyes. Always wash your hands after handling any amphibian.
Lizards superficially
represent salamanders and laymen often confuse the two. Lizards have dry
skin covered with scales, toes that end in sharp claws, and an external
ear opening found anterior to the neck. Throughout most of the range considered
no lizards are found.
All salamanders are carnivorous. The preferred food
of most is invertebrates, although the Spring Salamander prefers other
salamanders and all salamanders will eat almost anything that fits into
their mouths.
Terminology
The study of salamanders, as the study of all groups of life, requires
one to learn the words specific to the group. Some of those words are listed
below.
Reproduction
Most salamanders are bisexual with both male and
female representatives (there are some weird exceptions.) Although the
specifics of the reproductive cycles may vary, many of the basics hold
true throughout the order. Environmental factors stimulate breeding responses.
These factors include increasing or decreasing photoperiod, warm rains,
and temperature. Males and females of many species must wander far distances
from their home territories to ponds or streams where they can breed. Other
species breed on the forest floor or in places far removed from water.
Ritualized courtship is performed where males and females utilize a series
of movements before mating. This is especially true of the mole salamanders.
These movements are very specific from one species to another and are thought
to help the animal recognize whether its potential mate is of the correct
species. After courtship the male and female of some species enter amplexus.
This occurs when the male clasps his forelegs around the female and does
not let go. The act of amplexus stimulates the female to accept the male
as her mate. The male releases his grip and deposits a spermatophore on
the substrate where the mating process is taking place. The female then
picks up the spermatophore with her cloaca and holds it within her body.
Fertilization takes place internally. Individual species have differently
shaped spermatophores making hybridization difficult. If a female picks
up a spermatophore of the wrong species it simply will not fit and fertilization
does not take place. After picking up a spermatophore the female
begins laying her eggs. As an egg passes through the cloaca the spermatophore
releases its sperm, thus fertilizing the egg internally. As the egg is
released the female covers it with a jelly-like coating.
In many species this entire process happens under
water where the eggs hatch and tadpoles become adult salamanders. In other
species, notably the genus Plethodon, the process takes place outside
of the water and the tadpoles undergo the entire metamorphosis process
inside of the egg. The young hatch as miniature forms of the adults. The
major disadvantage to this technique is that a lot of yolk is required
to provide energy to the developing young. As a result fewer eggs are produced
and the females of many of these species guard the eggs so that none will
be lost.
Hellbenders are unique among our salamanders in
that fertilization is external and no spermatophores are produced. Hellbenders
reproduce in a manner similar to fish in that the males and females release
their gametes into the water where the eggs and sperm will randomly find
each other to begin fertilization.
Redback Salamander
Plethodon cinereus
Chemung County, NY
Families
Salamanders are in the Class Amphibia, Order Caudata. There are 18
species of salamanders in our range representing 5 Families.
Family Cryptobranchidae- Giant Salamanders
Family Proteidae- Mudpuppies and Waterdogs
Family Ambystomatidae- Mole Salamanders
Family Salamandridae- Newts
Family Plethodontidae- Lungless Salamanders