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Low recapture rate in PIT marked urban populations of the common toad

100%

Mazgajska J., Mazgajski T. D.

Polish Journal of Ecology

2016

tom 64

nr 4

Individual marking is necessary for determining various elements of species ecology, but toe-clipping — a method frequently used in amphibian studies, is recently being questioned. Three water bodies (of 0.3 to 1.5 ha in size) used by common Bufo bufo for breeding, located within a large city (Warsaw, Central Poland), were chosen for the study. Captured toads had Passive Integrated Transponders (PIT) subcutaneously implanted under laboratory conditions. Marked toads were searched in consecutive breeding seasons. The recapture rate of males in particular ponds was up to 13% — much lower than in other studies carried out in non-urban habitats. 77% of re-trapped individuals were found in the next season after tagging. There were no differences in the frequency of re-trapped individuals in relation to the toe-clipping treatment, as some marked individuals had part of the toe (two phalanges) clipped for skelotochronological analyses. An individual from this group was observed to have regenerated the clipped toe after one year. We did not find any indication of better body condition among the re-trapped individuals when comparing them to the marked toads at the time they were first captured. The important advantage of PIT tagging is the fact that all individuals are marked in the same way and their handling is similar. This makes it possible to compare various demographic parameters (growth rate, survival etc.). In addition, the number of animals that can be permanently marked using PITs is several times higher than through the use of codes resulting from the clipping of fingers and toes.

A comparison of conventional capture versus PIT reader techniques for estimating survival and capture probabilities of big brown bats (Eptesicus fuscus)

84%

Ellison L. E., O'shea T. J., Neubaum D. J., Neubaum M. A., Pearce R. D., Bowen R. A.

Acta Chiropterologica

2007

tom 09

nr 1

We compared conventional capture (primarily mist nets and harp traps) and passive integrated transponder (PIT) tagging techniques for estimating capture and survival probabilities of big brown bats (Eptesicus fuscus) roosting in buildings in Fort Collins, Colorado. A total of 987 female adult and juvenile bats were captured and marked by subdermal injection of PIT tags during the summers of 2001–2005 at five maternity colonies in buildings. Openings to roosts were equipped with PIT hoop-style readers, and exit and entry of bats were passively monitored on a daily basis throughout the summers of 2002–2005. PIT readers ‘recaptured’ adult and juvenile females more often than conventional capture events at each roost. Estimates of annual capture probabilities for all five colonies were on average twice as high when estimated from PIT reader data ( p̂ = 0.93–1.00) than when derived from conventional techniques ( p̂ = 0.26–0.66), and as a consequence annual survival estimates were more precisely estimated when using PIT reader encounters. Short-term, daily capture estimates were also higher using PIT readers than conventional captures. We discuss the advantages and limitations of using PIT tags and passive encounters with hoop readers vs. conventional capture techniques for estimating these vital parameters in big brown bats.

Ograniczanie wyników

1 Acta Chiropterologica

1 Polish Journal of Ecology

1 Bowen R. A.

1 Ellison L. E.

1 Mazgajska J.

1 Mazgajski T. D.

1 Neubaum D. J.

1 Neubaum M. A.

1 O'shea T. J.

1 Pearce R. D.

1 2016

1 2007

Wyniki wyszukiwania

Low recapture rate in PIT marked urban populations of the common toad

A comparison of conventional capture versus PIT reader techniques for estimating survival and capture probabilities of big brown bats (Eptesicus fuscus)