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Though newts are exclusively carnivorous predators, non-prey items (silt, plants, skin sloughs) also have been found in their stomachs. There are no previous studies on this topic apart from casual reports. We conducted a dietary study of Alpine newts (Mesotriton alpestris) at two localities in the Czech Republic, focusing on the influence of sex, locality, month, and weight of digested prey on consumption of non-prey items. Localities were two fishless ponds (surface area <40 m2, depth <1 m) at an elevation of about 450 m. Both ponds were isolated from other water bodies and inhabited also by Smooth newts (Lissotriton vulgaris L.) and Common frogs (Rana temporaria L.). Newts were captured by net from the shores and stomach contents were extracted using a stomach flushing technique. We sampled 190 individuals. At least one non-prey item (i.e. silt, plants, skin sloughs) was found in 44% of newts. stomachs. The most numerous items were plant fragments. The weight of consumed prey did not affect the presence of non-prey items in stomachs of newts. Locality (probably relating to prey availability) affected frequency of newts with plants and silt in their digestive tracts, but skin sloughs were consumed at both localities with the same frequencies. All non-prey items were consumed mainly at the beginning of the breeding season (year 1997) and with no difference in frequencies between males and females.
Czasopismo
Rocznik
Tom
Strony
631--635
Opis fizyczny
Bibliogr. 23 poz.,
Twórcy
autor
autor
autor
autor
- Department of Zoology and Fish Farming, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences, Prague, Kamycka 957, Praha 6-Suchdol 165 21, Czech Republic, kopeckyo@af.czu.cz
Bibliografia
- 1. Arntzen J.W. 2002 – Seasonal variation in sex ratio and asynchronous presence at ponds of male and female Triturus newts – J. Herpetol. 36: 30–35.
- 2. Cicort-Lucaciu A.-S., Ardeleanu A., Cupsa D., Dalea A. 2005 – The trophic spectrum of a Triturus cristatus (Laurenti 1768) population from Plopis Mountains area (Bihor County, Romania) – North-West. J. Zool. 1: 31–39.
- 3. Denoël M., Andreone F. 2003 – Trophic habits and aquatic microhabitat use in gilled immature paedomorphic and metamorphic Alpine newts (Triturus alpestris apuanus) in a pond in central Italy – Belg. J. Zool. 133: 95–102.
- 4. Dolmen D., Koksvik J.I. 1983 – Food and feeding habits of Triturus vulgaris (L.) and T. cristatus (Laurenti) (Amphibia) in two bog tarns in central Norway – Amphibia-Reptilia, 4: 17–24.
- 5. Ferner J.W. 1979 – A review of marking techniques for amphibians and reptiles – Herpetol. Circ. 9: 1–41.
- 6. Griffiths R.A. 1986 – Feeding niche overlap and food selection in smooth and palmate newts, Triturus vulgaris, and T. helveticus, at a pond in mid-Wales – J. Anim. Ecol. 55: 201–214.
- 7. Griffiths R.A. 1996 – Newts and Salamanders of Europe – Poyser and Poyser, London.
- 8. Griffiths R.A., Mylotte V.J. 1987 – Microhabitat selection and feeding relations of smooth and warty newts, Triturus vulgaris and T. cristatus, at an upland pond in mid-Wales – Holarctic Ecol. 10: 1–7.
- 9. Heyer W.R., Donnelly M.A., McDiarmid R.W., Hayek L.C., Foster M.S. 1994 – Measuring and Monitoring Biological Diversity: Standard Methods for Amphibians – Smithsonian Institution Press, Washington.
- 10. Kopecký O., Šusta F. 2006 – Vliv kondice na vstup do vodní fáze u čolka horského (Triturus alpestris, Laurenti 1768) – Východočeský Sborník Přírodovědný – Práce a studie, 13: 211–217 (in Czech).
- 11. Kopecký O., Vojar J., Denoël M. 2010 – One pond is not enough for newts: Movements between aquatic habitats during a breeding season – Amphibia-Reptilia, 31: 109–116.
- 12. Kutrup B., Cakir E., Yilmaz N. 2005 – Food of the Banded newt, Triturus vittatus ophryticus (Berthold, 1846) at different sites in Trabzon – Turk. J. Zool. 29: 83–89.
- 13. Luiselli L., Capizzi D., Filippi E., Anibaldi C., Rugiero L., Capula M. 2007 – Comparative diets of three populations of an aquatic snake (Natrix tessellata. Colubridae) from Mediterranean streams with different hydric regimes – Copeia, 2: 426–435.
- 14. Opatrný E. 1968 – Příspěvek k poznání potravy našich vodních skokanů (Rana ridibunda Pallas, Rana esculenta Linné) – Acta Universitae Palackinae Olomoucensis, Facultaes Rerum Naturalium, 28: 133–139 (in Czech).
- 15. Opatrný E. 1980 – Food sampling in live amphibians – Věstník Československé Společnosti Zoologické, 44: 268–271 (in Czech).
- 16. R Development Core Team 2009 – R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria.
- 17. Rulík M. 1993 – Contribution to the knowledge of the diet of the newt Triturus alpestris – Folia Zool. 42: 33–45.
- 18. Schabetsberger R., Jersabek Ch.D. 1995 – Alpine newt (Triturus alpestris) as top predators in a high-altitude karst lake: daily food consumption and impact on the copepod Arctodiaptomus alpinus – Freshwater Biol. 33: 47–61.
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- 20. Ultsch G.R. 1973 – Observations on the life history of Siren lacertina – Herpetologica, 29: 304–305.
- 21. Vitt L.J., Caldwell J.P. 2009 – Herpetology, An Introductory Biology of Amphibians and Reptiles (3rd edition) – Academic Press, Burlington, MA, USA.
- 22. Weddeling K., Hachtel M., Sander U., Tarkhnishvili D. 2004 – Bias estimation of newt population size: a field study at five ponds using drift fence, pitfalls and funnel traps – Herpetol. J. 14: 1–7.
- 23. Weldon P.J., Demeter B.J., Rosscoe R. 1993 – A survey of shed skin/eating (dermatophagy) in amphibians and reptiles – J. Herpetol. 27: 219–228.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-3303-2809