Ever since Emory acquired Lullwater in 1958, visitors
have been treated to the sight of amateur anglers fishing along
the banks of Candler Lake, located about a quarter-mile inside the
park between Lullwater House and Clairmont Campus. But until now—well,
until this fall—no one could be exactly sure what the fishermen
could catch.
This summer biology lecturer Chris Beck is working with a student
from the University of Texas-San Antonio to catalog the species
of fish living in Candler Lake and study their habitat preferences
and movements. Once the species inventory is completed, it will
be added to the appendices of the Lullwater Management Plan, which
already lists the birds, mammals, amphibians and reptiles that live
in the park.
Beck is supervising the work of rising junior Carlos Lozano, who
is visiting from Texas as part of the Summer Undergraduate Research
Experience (SURE), sponsored by the Center for Science Education
through a grant from the Howard Hughes Medical Institute.
A biology major, Lozano is interested in studying coastal fisheries,
and though the 11.5-acre Candler Lake boasts only a modest measure
of coastline, he said the work is preparing him well for graduate
school.
“I’ve been a fisherman ever since I can remember and
have always loved it—this experience will provide me with
a foundation to build on,” Lozano said. “I have done
marine research in the past, however this is the first time I’ve
worked exclusively with fish.”
Lozano and Beck designed a sampling protocol involving a network
of traps of different sizes placed systematically around the lake;
there are four “minnow traps” that catch small fish,
three turtle traps and one large-fish trap. Twice a day Lozano wades
into the water and records the aquatic species detained inside the
traps. The pair also will use rod and reel to land some of the bigger
fish like bass and catfish.
“We’ve identified eight species so far,” Beck
said. “We’re progressively moving around the perimeter
of the lake, then we’ll move toward the interior.”
To study their movements, he and Lozano are tagging fish with tiny
streamers of colored beads, sequenced to allow for individual identification
later, and recording the exact position in which the fish were caught
using a global positioning system (GPS) device. By the end of the
three-month project, Beck said the pair should have a fairly comprehensive
survey of what’s living in the shallow lake.
Though this project does not tie directly into Beck’s primary
research interests, he said it carries scholarly value; most studies
of fish migration have been performed on a much larger scale, he
said, and small-scale movement patterns have not been well studied
in the ecological literature.
“It will give us insights into habitat preference,”
said Beck, adding that he and Lozano also are mapping the physical
structure of the lake: its depth and its oxygen, pH and light levels.
“With some of the sport species like bass, you could use some
of that knowledge to manage a lake, for instance.”
Candler Lake is named for Walter Candler, third son of Asa Candler
and original owner of Lullwater House and its grounds. Candler created
the lake in 1952 by building a dam on South Fork Peachtree Creek,
but it is not known whether the lake’s species migrated in
via the creek or whether it was stocked with sport fish such as
largemouth bass.
This fall, Beck said he and another student, along with Oxford biology
professor Steve Baker, will survey the fish living in Lullwater’s
many streams. Admitting he is not much of a fisherman, Beck deflects
much of the credit for this summer’s work to his pupil from
San Antonio.
“Carlos brings with him a lot of basic knowledge of freshwater
fish,” Beck said. “Combined with my background in ecology,
we can turn this into an interesting ecological question.”
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