cine solution for 12–24 h (Kligerman and Bloom 1977). Adult
, 2005, 36(1), 45–47.
frogs, on the other hand, will need to be injected with a small
2005 by Society for the Study of Amphibians and Reptiles
amount of colchicine (1 mg/ml deionized water) using a 23-gauge
PIT Tag Retention in Trachemys and Pseudemys
needle (1.9 cm in length). To ensure circulation throughout thetorso the colchicine solution should be injected through the skinof the dorsum and into the abdomen at a depth of ca. 3 mm. A frog
ALIYE L. RUNYAN
5 cm in length, such as Gray Treefrogs, should be injected with
PETER A. MEYLAN
ca. 0.5 cc of the solution. Frogs of larger or smaller size should be
Eckerd College, St. Petersburg, Florida 33711, USA
injected with amounts scaled up or down relative to the amount
used for adult Gray Treefrogs. Once injected, adult frogs should
be placed into a container with a moist paper towel at 30°C for10–12 h (Bogart 1967).
Passive integrated transponders are small microprocessors en-
Once the specimens (either tadpole or adult frog) have been
cased in glass that transmit a unique identification number to an
subjected to the colchicine solution for the correct time, they should
electronic reader when the tag is activated by the reader with a
be sacrificed by the application of Orajel® to the top of the head
low frequency radio signal at close range (Balazs 1999). PIT tags
(Altig 1980). Once sacrificed, the specimens can be dissected and
were originally developed to census fish populations (Boarman et
tissue samples may be taken from various locations on the speci-
al. 1998) and to track fish migration (Prentice et al. 1987). How-
men. Leg buds, gills, and intestinal tissue samples were the most
ever, their use has become widespread in the identification and
successful from tadpoles and intestinal tissue worked best for adult
monitoring of individuals of other vertebrate groups. PIT tags have
frogs. The tissue sample should be no longer than 0.5 cm in length
been successfully used in studies of mammals, such as otters, rats,
and should be placed in a small vial containing about 10 times
bats, mice, ferrets (Elbin and Burger 1994), and voles (Harper and
their volume of 0.4% KCl hypotonic solution and should be al-
Batzli 1996). PIT tagging has been used on a variety of amphib-
lowed to sit for 20–30 min (Kligerman and Bloom 1977). Trans-
ians and reptiles, including lizards, alligators, frogs, and toads
fer the tissue into 2–3 changes of fixative (3:1 ethanol:acetic acid
(Elbin and Burger 1994), neonatal snakes (Keck 1994), caiman
solution) for ca. 30 min each time (Kligerman and Bloom 1977).
hatchlings (Dixon and Yanosky 1993), and rattlesnakes
Mount chromosomes on slides using heat fixation. This can be
(MacGregor and Reinert 2001). In freshwater turtles (Elbin and
accomplished by heating blank slides 46–48°C. The tissue sample
Burger 1994; Buhlmann and Tuberville 1998), and sea turtles
should then be placed into a separate vial containing 100 µl 50%
(Balazs 1999; McDonald and Dutton 1996), PIT tags have also
acetic acid (Kligerman and Bloom 1977). Tap the vial for 60–90
been proven successful. In a study of PIT tag utility, Camper and
sec to break apart the tissue and form a cell suspension. Using a
Dixon (1988) tagged 24 individuals of eight different species of
pipetman, draw the cell suspension into the tip and expel it onto
freshwater turtles, including eight Trachemys scripta elegans.
the slide. Quickly withdraw the suspension back into the pipet tip,
PIT tag effectiveness has been discussed in a number of differ-
leaving as little liquid on the slide as possible.
ent studies, including one on the Pine Snake (Elbin and Burger
Stain chromosomes with 4% Geimsa made up in 0.01 M phos-
1994), and another on a large group of Desert Tortoises (Boarman
phate buffer at pH 7 for 10 min. Air-dry the slides and place in
et al. 1998). Both of these studies came to the conclusion that PIT
xylene for 10 min to remove excess water. Once dried, the slides
tags were an efficient and reliable method of marking and track-
can completed by using Permount and a cover slip over the fixed
ing their respective subjects. There have been relatively few re-
ports on tag retention in freshwater turtles, Buhlmann andTuberville (1998) being the only one with large sample sizes known
—We thank P. Villani for assisting with digital im-
to us. Balazs (1999) discussed some of the advantages and disad-
ages of the chromosome spreads. This study was supported by two grants
vantages of tagging sea turtles with PIT tags. Advantages of the
from the Augustana Research Foundation, Augustana College: Bernsten
tags include virtually no loss or damage over time from breakage
Award to LG, and Faculty Research Grant to SBH.
or corrosion, which offers the possibility of long-term reliable re-tention in sea turtles. Disadvantages include migration within body
tissue, inability to detect a tag without a reader, and overall highercost for the PIT tags (US $6.00 each) and reader (~ US $400) as
ALTIG, R. 1980. A convenient killing agent for amphibians. Herpetol. Rev.
compared to external tags. PIT tags appear to have no adverse
BOGART, J. P. 1967. Chromosome of the South American amphibian fam-
effects upon the freshwater turtles into which they are injected
ily Ceratophridae with a reconsideration of the taxonomic status of
Can. J. Genet. Cytol. 9:531–542.
During the course of a study of the impact of the invasive turtle
GOSNER, K. L. 1960. A simplified table for staging anuran embryos and
Trachemys scripta elegans
on native Pseudemys floridana
larvae with notes on identification. Herpetologica 16:183–190.
populations in St. Petersburg, Florida, PIT tags were in-
KLIGERMAN, A. D., AND S. E. BLOOM. 1977. Rapid chromosome prepara-
jected into each captured turtle in order to recognize individuals
tions from solid tissues of fishes. J.
Fish. Res. Board Can. 34:266–269.
of all three species. Our goal here is to examine tag retention and
WASSERMAN, A. O. 1970. Polyploidy in the common tree toad Hyla versi-
tag movement in the turtles marked for that study and to report on
. Science 167:385–386.
the utility of a specific injection site between the pelvis and plas-tron. Furthermore, we assess the impact of PIT tags on femalereproduction.
Since April of 1998, retention and movement of PIT tags from
the site of implantation in turtles of three species were studiedusing x-rays. Throughout the study, x-rays were taken to deter-mine if captured females were carrying eggs (Gibbons and Greene1979). This also allowed the presence and movement of PIT tagsto be observed. Most of our data are from adult female T. scriptaelegans
; however, small samples of female Pseudemys floridana
and P. nelsoni
were also tagged, recaptured, and x-rayed, as weresmall samples of males of all three species. Females were keptovernight to be x-rayed at a veterinarian’s office. Three males,two P. floridana
and one T. s. elegans
, were x-rayed to confirmthe location of the PIT tag after a number of years. Turtles werereleased into the ponds from which they were captured.
Turtles were captured using hoop traps (Nylon Net Co.) in six
ponds on the Eckerd College campus, St. Petersburg, Florida (Emer2004; Hutchinson 1992). Upon first capture, each turtle was givena unique three-letter code that was drilled into their marginal scutes(Gibbons and Greene 1979), which was used to identify turtles incase of PIT tag loss. Beginning in April 1998, PIT tags were usedalong with scute drilling. Prior to injection, the turtle was placedon its carapace. The tag was injected with a 13-gauge needle intomuscles and connective tissue between the pelvis and plastron justlateral to the midline. This location was chosen because it is be-tween two plates of bone that move little relative to one another,subjecting the tag to the least disturbance possible. The needlewas inserted just through the skin into the tissue dorsal to thexiphiplastron and ventral to the ischium, lateral to the cloaca. Thetag was delivered into connective tissue and muscle by a plungerbuilt into the syringe. Care was taken to avoid any inadvertentlateral tail movement during insertion of the needle. When turtleswere recaptured, PIT tags were read using an AVID, Inc. scannerby placing the scanner along the interanal seam of the plastron.
FIG. 1. X-ray of male Pseudemys floridana
showing the location of the
The locations of the PIT tags were followed using x-rays in a
PIT tag; located laterally and to the right of the midline.
total of eleven female T. s. elegans
. In these turtles, the PIT tagsstayed in essentially the same location into which they were in-jected. These eleven females had been PIT tagged over a period of
x-rayed. Two males were x-rayed at recapture; one had retained
five months (April–June 1998). They were found to have retained
the PIT for 36 months, and the other for 14 months between cap-
the tags at subsequent captures, ranging from 30 days to 48 months
tures (Fig. 1). The female was tagged and x-rayed on first capture,
later. In two females, the PIT tags moved from one side of the
but was not recaptured. In the turtles that were checked with the
midline to the other over a period of 16 days to 16 months, respec-
scanner but not x-rayed, tags could be read at subsequent recap-
tively. Another female died during the course of the study of causes
tures, spanning periods of 20–30 months. Only one of three P.
not related to the tag implant; this female had lost a PIT tag and
has been tagged and subsequently recaptured. This adult
had a second one injected. It is believed that this turtle lost the
female had retained the PIT tag for 32 months.
first tag because it was placed too far posterior of the ideal injec-
It appears that PIT tags are reliable if properly injected into the
tion site and was lost through the injection site. The second tag
location described above, and the tags do not get lost when placed
was placed in the proper position and was retained for 45 months
in connective tissue where very little movement occurs. In this
until her death. At least two females developed, carried, and laid
study, the tags did not appear to be more effective than carapacial
clutches of eggs without affecting the position of the PIT tag, nor
drilling. However, if tracking of large numbers of turtles were
did the tag appear to interfere with the normal reproductive pro-
necessary (Boarman et al. 1998), or for tagging of softshell turtles,
cess. One male T.s. elegans
was x-rayed 50 months after implan-
PIT tags would be more efficient. Another consideration with the
tation of the PIT, and the tag was found to be in the same location
use of the PIT tag system is that while electronic readers cost on
into which it was injected originally. Seventeen other males were
average US $400, PIT tags remain expensive at US $6 per tag.
tagged, and retained their PIT tags without loss between captures
This may affect the use of PIT tags in a study that monitors large
spanning from 73 days to 35 months. All tags were readable at
numbers of animals. The tags are an easier and quicker method of
marking turtles than scute drilling, and while carapacial scute
PIT tags in a total of eight Pseudemys floridana
and three P.
markings may grow back after one to two years in juvenile
were also monitored. Two female and six male P. floridana
(Meylan, unpubl.), the PIT tags remain in place and
were tagged, but only one female and two males were subsequently
are readable for at least 50 months after implantation. The lifespan
of a PIT tag is theoretically the lifetime of the animal; because aPIT tag is a passive marking system, as long as it remains inside
the animal, it should be readable. The first successful PIT tag wasmade in the early 1990s, and is still working today, so the lifetime
, 2005, 36(1), 47–49.
is at least 14–15 yrs (AVID, Inc., pers. comm., 16 January 2004).
2005 by Society for the Study of Amphibians and Reptiles
PIT tags are easier to read and provide a check on drilling or notch-ing, thus leading to fewer errors when large numbers of collabora-
Notes on the Captive Husbandry of the King
tors collect data, or when large numbers of animals are used in a
Cobra (Ophiophagus hannah) at the Centre for
Herpetology/Madras Crocodile Bank, India
.—This study has been supported by Eckerd Col-
lege. Many thanks to Diana Huestis, the Eckerd College Herpetology
P.O. Box 21, Tamil Nadu, Chengalpattu 603 002, India
Club, and Drs. Richard Wilkes and Shawna Greene at Bay MooringsAnimal Hospital. Thanks also to Jim Dixon for reviewing and providing
Madras Crocodile Bank/Centre for Herpetology, P.O. Box 4 Mamallapuram
BALAZS, G. H. 1999. Factors to consider in the tagging of sea turtles.
IUCN/SSC Marine Turtle Specialist Group, Publ. No. 4. 101–109.
Carmelaran Post, Sarjapur Rd., Karnataka, Bangalore 560 035, India
BOARMAN, W. L., M. L. BEIGEL, G. C. GOODLETT, AND M. SAZAKI. 1998. A
passive integrated transponder system for tracking animal movements.
Despite being such a large, conspicuous snake, the King Cobra
) was not described until 1836 (Cantor 1836).
BUHLMANN, K. A., AND T. D. TUBERVILLE. 1998. Use of Passive Integrated
To date, little is known regarding its natural history and reproduc-
Transponder (PIT) tags for marking small freshwater turtles. Chelon.
Conserv. Biol. 3:102–104.
tive biology. For a summary of field observations of reproductive
CAMPER, J. D., AND J. R. DIXON. 1988. Evaluation of a microchip marking
system for amphibians and reptiles. Texas Parks and Wildlife Depart-
Examination of reproductive data reveals some interesting trends.
ment, Research Publication 7100-159:1–22.
In general, mating occurs in the post-winter warming period, egg
DIXON, J. R., AND A. A. YANOSKY. 1993. A microchip marking system for
development within the female occurs in the tropical summer, nest-
identification of caiman hatchlings. Bull. Maryland Herpetol. Soc.
ing and egg laying coincide with pre-monsoon showers, and hatch-
ing occurs at the peak of the monsoon. Captive snakes in locales
ELBIN, S. B., AND J. BURGER. 1994. Implantable microchips for individual
far removed from monsoon seasons remain faithful to this breed-
identification in wild and captive populations. Wildl. Soc. Bull. 22:677–
ing cycle. While the monsoon in Chennai (where no King Cobras
EMER, S. 2004. Growth of a population of Trachemys scripta elegans
occur) is in the winter, reproductive behavior in our captive King
Fox Pond, Eckerd College, Pinellas County, Florida. Herpetol. Rev.
Cobras followed the southwest monsoon cycle of southwestern
GIBBONS, J. W., AND J. L. GREENE. 1979. X-ray photography: a technique
In 1996, we established a conservation-oriented captive-breed-
to determine reproductive patterns of freshwater turtles. Herpetologica
ing program for King Cobras at the Madras Crocodile Bank/Cen-
tre for Herpetology (MCB/CFH). The objectives were to (a) de-
HARPER, S. J., AND G. O. BATZLI. 1996. Monitoring use of runways by
velop methods and a protocol for the breeding of King Cobras in
voles with passive integrated transponders. J. Mammal. 77:364–369.
India, and (b) to offer captive bred King Cobras to zoos in order to
HUTCHINSON, A. M. 1992. A reproducing population of Trachemys scripta
discourage the taking of animals from the wild. Herein, we report
in southern Pinellas County, Florida. Herpetol. Rev. 23:74–75.
KECK, M. B. 1994. Test for detrimental effects of PIT tags in neonatal
husbandry and captive breeding information along with previously
MACGREGOR, G. A., AND H. K. REINERT. 2001. The use of passive inte-
—In 1996, MCB/CFH received seven (three males
grated transponders (PIT tags) in snake foraging studies. Herpetol. Rev.
and four females) adult King Cobras; four of these were on breed-
ing loan from Indian zoos and three had been seized by the Wild-
MCDONALD, D. L., AND P. H. DUTTON. 1996. Use of PIT tags and photo
life Department from snake collectors.
identification to revise remigration estimates of leatherback turtles
A block of eight rooms was constructed of brick and mortar
) nesting in St. Croix, U.S. Virgin Islands, 1979–
with light roofing. Each room measured 3.5 x 1.5 x 2 m (L x W x
1995. Chelon. Conserv. Biol. 2:148–152.
H). At the rear of each room (opposite the door) is a 100-mm air
PRENTICE, E. F., T. A. FLAGG, AND S. MCCUTCHEON. 1987. A study to deter-
mine the biological feasibility of a new fish tagging system, 1986–
duct connected to an air conditioner, which from April to Septem-
1987. Annual Report of Research. U.S. Dept. Energy, Bonneville Power
ber (1000–1600 h) creates a temperature gradient of about 6ºC,
Administration, Division of Fish and Wildlife. 112 pp.
increasing to 30ºC towards the door. Outside the rooms, the ambi-ent temperature may reach 40ºC + during this period. Throughoutthe rest of the year (cooler months with lows of 18– 20ºC), a heat-ing pot containing a 25-watt bulb placed in an upturned mud pot issituated in the rear corner of each room. The surface temperatureof the exposed section of the pot averages 31ºC. Each room has a
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Krieg, Inflation und Fortschritt sind beherrschbar Die fünf Prinzipien für dauerhaften Unternehmenserfolg / Von Christian Stadler Erfolgreiche Unternehmen schaffen es, sich an ein ständig veränderndes Umfeld anzupassen, indem sie intelligent konservativ agieren. Das ist das Ergebnis einer sechsjährigen Studie, die herausragende 100 Jahre alte Unternehmen mit weniger erfolgreichen Mit