On a recent bird watching trip with the Mississippi Coast Audubon Society,
I was excited to see one of the neatest creatures to be found in our freshwater
ponds and lakes – Moss Animals, or
more properly called Bryozoans. OK,
yes it sounds like the name of a monster in a “B Movie”, and that may well be
how the “blob” was inspired, but Bryozoans are so much more interesting.
The Moss Animals that we found in Lower Rines Lake in the
Pascagoula Wildlife Management Area are far from sinister and actually help to
filter the water. What we found is actually a colony of many individuals
(called zoids) known as the Magnificent
Bryozoan, Pectinatella magnifica.
The proper name for Moss Animals is based on the Greek word for moss (bryon) and
the Latin word for animal (zoa). Pectinatella translates to “having narrow
projections or divisions”, or in this case, oval clusters, as described below.
As the name “magnificent” implies our species can be quite
large, in some cases reaching the size of soccer balls in freshwater lakes
across the eastern United Sates. They are usually attached to dead branches but
are occasionally free-floating. The cool part is that this colonial organism
grows in size as the clusters of individuals grow across the surface – seen as
oval to circular clusters, usually whitish in appearance. As these clusters
grow, the central mass of gelatinous material also grows.
Each individual zoid has a ring of sticky tentacle-like arms
that collect microscopic organisms like diatoms that are swept into the central
mouth. The combination of hundreds to thousands of zoids on a large colony, and
many such colonies, can act to filter the water in which these colonies live.
Some fish and insects may feed upon the zoids and some snails may graze on the
surface. Otherwise these Moss Animals have the pond or lake to themselves. Most
often seen in late summer as large masses, these organisms form cold-resistant
cells that overwinter, emerging in the spring to form new colonies.
And no, these creatures will not sting you, but may leave a
bit of slime behind should you encounter them. To get a chance to see them in
person, head up to Rines Lakes in the Pascagoula River Wildlife Management Area,
just west of Lucedale. Look for them attached to submerged branches from the
wooden piers at either lake. Please note that visits to the state’s Wildlife
Management Areas (WMA) require a “WMA Use
Permit”, obtained where fishing licenses are sold. Please do not let that
stop you from visiting, as this modest fee ($15 for residents) helps keep these
areas open for hunting, fishing, birding, and seeing Magnificant Bryozoans. If
you go in the month of September, you many also get to see Wood Storks, Bald
Eagles and any number of fall-migrating birds.
Many thanks to Lucy Costilow Jacobson for use of her photo.
Hope to see you in our great outdoors!!!