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Biodiversity and Conservation

, Volume 23, Issue 12, pp 3091–3100 | Cite as

Sighting frequency decreases over two decades in three populations of Testudo hermanni from central Italy

  • Luca LuiselliEmail author
  • Massimo Capula
  • Russell L. Burke
  • Lorenzo Rugiero
  • Dario Capizzi
Original Paper

Abstract

Sighting frequency of tortoises (Testudo hermanni), standardized by the number of person-hours of field effort, was studied between 1992 and 2013 at three different study areas in central Italy. Although the frequency of tortoise sightings fluctuated substantially across years and among study areas, there was a significant declining trend in all the three areas, with GLM analyses showing also a significant interaction between study area and sampling year. The decreasing trend was higher in Castel Fusano than in the other two sites, with yearly frequency of sightings being independent of search effort in all of the study areas. These trends may indicate population declines, because no other explanations seem plausible. Total rainfall from previous autumn to the study period was positively correlated to tortoise sightings in only one locality. The yearly frequency of sightings of juvenile tortoises did not vary significantly among study areas and across years, thus indicating that simple differences in detectability cannot explain the observed patterns. Summer fires and forest overgrowing seem to explain the tortoise decline in two study areas (Castel Fusano and Oriolo) whereas we were not able to identify any specific reason for tortoise decline in the third study area (Manziana).

Keywords

Italy Tortoise Long-term monitoring Conservation 

Notes

Acknowledgments

This study was conducted under authorizations of the Regione Lazio. No animals were damaged during the execution of this study. Three anonymous referees substantially improved the quality of the submitted draft.

References

  1. Alessandrini A, Blasi S, Biondi F, Chiocchini U, Di Filippo A, Eusepi G, Piovesan G, Santarelli G (2008) Geopedologia, auxologia e dendroclimatologia di un ceduo. Alberi e Territorio 6:13–17Google Scholar
  2. Aresco MJ, Guyer C (1999) Growth of the tortoise Gopherus polyphemus in slash pine plantations of Southcentral Alabama. Herpetologica 55:499–506Google Scholar
  3. Bertolero A, Carretero MA, Llorente GA (2005) An assessment of the reliability of growth rings counts for age determination in the Hermann’s tortoise Testudo hermanni. Amphib-Reptil 26:17–23CrossRefGoogle Scholar
  4. Bertolero A, Cheylan M, Hailey A, Livoreil B, Willemsen RE (2011) Testudo hermanni (Gmelin 1789)—Hermann’s Tortoise. In: Rhodin AGJ, Pritchard PCH, Van Dijk PP, Saumure RA, Buhlmann, KA, Iverson, JB, Mittermeier RA (eds) Conservation biology of freshwater turtles and tortoises: a compilation project of the IUCN/SSC tortoise and freshwater turtle specialist group.Chelonian Research Monographs, vol. 5, pp. 070.1–070.10. doi: 10.3854/crm.5.059.hermanni.v1.2011, http://www.iucn-tftsg.org/cbftt/
  5. Buhlmann KA, Akre TSB, Iverson JB, Karapatakis D, Mittermeier RA, Georges A, Rhodin AGJ, van Dijk PP, Gibbons JW (2009) Global analysis of tortoise and freshwater turtle distributions with identification of priority conservation areas. Chelonian Conserv Biol 8:116–149CrossRefGoogle Scholar
  6. Burke RL, Cox J (1989) Evaluation and review of field techniques used to study and manage gopher tortoises. In: Management of amphibians, reptiles and small mammals in North America. USDA Forest Service General Technical Report RM-166, pp 205–215Google Scholar
  7. Capula M, Rugiero L, Capizzi D, Milana G, Vignoli L, Franco D, Petrozzi F, Luiselli L (2014) Long-term, climate-change-related shifts in monthly patterns of roadkilled Mediterranean snakes. Herpetol J 24:97–102Google Scholar
  8. Cheylan M (2004) Incendies: lourd tribu pour les tortues d’Hermann. Espace Nat 1:5–10Google Scholar
  9. Corti C, Capula M, Luiselli L, Razzetti E, Sindaco R (2010) Fauna d’Italia Vol. XL Reptilia. Calderini, Bologna, pp 1–869. ISBN 978-88-506-5390-4Google Scholar
  10. Corti C, Bassu L, Biaggini M, Bressi N, Capula M, Di Cerbo AR, Di Francesco N, Di Tizio L, Fiacchini D, Lo Cascio P, Mastropasqua F, Nulchis V, Oneto F, Ottonello D, Richard J, Romano A, Satta MG, Scillitani G, Spilinga C, Vanni S (2013) Aggiornamento sulla distribuzione italiana delle testuggini terrestri appartenenti al genere Testudo. In: Di Tizio L, Brugnola L, Cameli A, Di Francesco N (eds) Atti II Congresso SHI Abruzzo Molise “Testuggini e Tartarughe”, Ianieri Edizioni, Pescara, pp. 153–170Google Scholar
  11. Coututier T, Tillion-Lacazale L, Besnard A, Astruc G, Cheylan M (2014) Déclin d’une population de Tortue d’Hermann (Testudo hermanni hermanni Gmelin, 1789) en milieu forestier. Effets combines de plusieurs facteurs anthropiques. Revue d’Ecologie (Terre et Vie) 69:142–150Google Scholar
  12. Del Vecchio S, Burke RL, Rugiero L, Capula M, Luiselli L (2011) The turtle is in the details: microhabitat choice by Testudo hermanni is based on microscale plant distribution. Anim Biol 61:249–261CrossRefGoogle Scholar
  13. Diemer JE (1986) The Ecology and Management of the Gopher Tortoise in the Southeastern United States. Herpetologica 42:125–133Google Scholar
  14. Fèlix J, Budo J, Capalleras X, Farré M (1989) Estructura de una poblacion de tortuga mediterranea (Testudo hermanni robertmertensi, Wermuth), antes y después de un incendio forestal. Treballs de la Societat Catalana d’Ictiologia i Herpetologia 2:210–223Google Scholar
  15. Garber SD, Burger J (1995) A 20-Yr study documenting the relationship between turtle decline and human recreation. Ecol Appl 5:1151–1162CrossRefGoogle Scholar
  16. Germano DJ, Bury RB (1998) Age determination in turtles: evidence of annual deposition of scute rings. Chelonian Conserv Biol 3:123–132Google Scholar
  17. Hailey A (2000) The effects of fire and mechanical habitat destruction on survival of the tortoise Testudo hermanni in northern Greece. Biol Conserv 92:321–333CrossRefGoogle Scholar
  18. Hailey A, Coulson IM (1996) Temperature and the tropical tortoise Kinixys spekii: constraints on activity level and body temperature. J Zool 240:523–536CrossRefGoogle Scholar
  19. IUCN (2013) IUCN red list of threatened species. Version 2013.2. www.iucnredlist.org Accessed 20 Feb 2014
  20. Lagarde F, Louzizi T, Slimani T, El Mouden H, Ben Kaddour K, Moulherat S, Bonnet X (2012a) Home range area in the tortoise Testudo hermanni in relation to habitat complexity: implications for conservation of biodiversity. Biodivers Conserv 10:1131–1140Google Scholar
  21. Lagarde F, Louzizi T, Slimani T, El Mouden H, Ben Kaddour K, Moulherat S, Bonnet X (2012b) Bushes protect tortoises from lethal overheating in arid areas of Morocco. Environ Conserv 39:172–182CrossRefGoogle Scholar
  22. Lambert MRK (1981) Temperature, activity and field sighting in the Mediterranean spur- thighed or common garden tortoise Testudo graeca L. Biol Conserv 21:39–54CrossRefGoogle Scholar
  23. Lohoefener R, Lohmeier L (1981) Comparison of Gopher Tortoise (Gopherus polyphemus) habitats in young slash pine and old longleaf pine areas of Southern Mississippi. J Herpetol 15:239–242CrossRefGoogle Scholar
  24. Luiselli L, Madsen T, Capizzi D, Rugiero L, Pacini N, Capula M (2011) Long-term population dynamics in a Mediterranean aquatic snake. Ecol Res 26:745–753CrossRefGoogle Scholar
  25. Mazzotti S (2004) Hermann’s tortoise (Testudo hermanni): current distribution in Italy and ecological data on a population from the north Adriatic coast (Reptilia, Testudinidae). Ital J Zool 71(S1):97–102CrossRefGoogle Scholar
  26. Pitzalis M, Bologna MA, Luiselli L (2013) Is evenness altered by fire in natural assemblages of soil arthropods? Acta Oecol 49:64–70CrossRefGoogle Scholar
  27. Reading CJ, Luiselli L, Akani GC, Bonnet X, Amori G, Ballouard JM, Filippi E, Naulleau G, Pearson D, Rugiero L (2010) Are snake populations in widespread decline? Biol Lett 6:777–780PubMedCrossRefPubMedCentralGoogle Scholar
  28. Rugiero L, Milana G, Capula M, Amori G, Luiselli L (2012) Long term variations in small mammal composition of a snake diet do not mirror climate change trends. Acta Oecol 43:158–164CrossRefGoogle Scholar
  29. Rugiero L, Milana G, Petrozzi F, Capula M, Luiselli L (2013) Climate-change-related shifts in annual phenology of a temperate snake during the last 20 years. Acta Oecol 51:42–48CrossRefGoogle Scholar
  30. Sanz-Aguilar A, Anadón JD, Giménez A, Ballestar R, Graciá E, Oro D (2011) Coexisting with fire: the case of the terrestrial tortoise Testudo graeca in Mediterranean shrublands. Biol Conserv 144:1040–1049CrossRefGoogle Scholar
  31. Van Djik PP, Stuart BL, Rhodin AGJ (2000) Asian turtle trade. Chelonian Res Monogr 2:1–164Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Luca Luiselli
    • 1
    • 2
    Email author
  • Massimo Capula
    • 3
  • Russell L. Burke
    • 4
  • Lorenzo Rugiero
    • 1
  • Dario Capizzi
    • 5
  1. 1.Centre of Environmental Studies DemetraRomeItaly
  2. 2.Niger Delta Ecology and Biodiversity Conservation Unit, Department of Applied and Environmental BiologyRivers State University of Science and TechnologyRivers StateNigeria
  3. 3.Museo Civico di ZoologiaRomeItaly
  4. 4.Department of BiologyHofstra UniversityHempsteadUSA
  5. 5.Biodiversity and GeodiversityRegional Park Agency (ARP)RomeItaly

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