Hermann's tortoise

The specific epithet, hermanni, honors French naturalist Johann Hermann.[4]

The subspecific name, boettgeri, honors German herpetologist Oskar Boettger.[4]

Testudo hermanni can be found throughout southern Europe. The western population (T. h. hermanni) is found in eastern Spain, southern France, the Balearic islands, Corsica, Sardinia, Sicily, south and central Italy (Tuscany). The eastern population (T. h. boettgeri ) inhabits Serbia, Kosovo, North Macedonia, Romania, Bulgaria, Albania, Turkey and Greece, while T. h. hercegovinensis populates the coasts of Bosnia and Herzegovina, Croatia, and Montenegro.

Hermann's tortoises are small to medium-sized tortoises from southern Europe. Young animals and some adults have attractive black and yellow-patterned carapaces, although the brightness may fade with age to a less distinct gray, straw, or yellow coloration. They have slightly hooked upper jaws and, like other tortoises, possess no teeth,[5] just strong, horny beaks.[6] Their scaly limbs are greyish to brown, with some yellow markings, and their tails bear a spur (a horny spike) at the tip.[6] Adult males have particularly long and thick tails,[7] and well-developed spurs, distinguishing them from females.[6]

The eastern subspecies T. h. boettgeri is much larger than the western T. h. hermanni, reaching sizes up to 28 cm (11 in) in length. A specimen of this size may weigh 3–4 kg (6.6–8.8 lb). T. h. hermanni rarely grows larger than 18 cm (7.1 in). Some adult specimens are as small as 7 cm (2.8 in).

• 
  Male of T. h. hermanni
• 
  Female of T. h. hermanni
• 
  Female of T. h. boettgeri

In 2006, Hermann's tortoise was suggested to be moved to the genus Eurotestudo and to bring the subspecies to the rank of species (Eurotestudo hermanni and Eurotestudo boettgeri).[8] Though some factors indicate this might be correct,[9] the data at hand are not unequivocally in support and the relationships between Hermann's and the Russian tortoise among each other and to the other species placed in Testudo are not robustly determined. Hence, it seems doubtful that the new genus will be accepted for now. The elevation of the subspecies to full species was tentatively rejected under the biological species concept at least, as there still seems significant gene flow.[10]

Of note, the rate of evolution as measured by mutations accumulating in the mtDNA differs markedly, with the eastern populations have evolved faster. This is apparently due to stronger fragmentation of the population on the mountainous Balkans during the last ice age. While this has no profound implications for taxonomy of this species, apart from suggesting that two other proposed subspecies are actually just local forms at present, it renders the use of molecular clocks in Testudo even more dubious and unreliable than they are for turtles in general.[11][12][10]

Early in the morning, the animals leave their nightly shelters, which are usually hollows protected by thick bushes or hedges, to bask in the sun and warm their bodies. They then roam about the Mediterranean meadows of their habitat in search of food. They determine which plants to eat by the sense of smell. In captivity, they eat a variety of wildflowers, however care must be taken regarding which are made available, as some flowers such as buttercups are toxic to them. Certain plants such as dandelion and kale are high in oxalic acid, which can build up over time causing renal failure, it is therefore important to carefully monitor their diet and give a varied selection of wildflower leaves. All pre prepared food pellets are bad for Hermann's tortoises, proving addictive, often resulting in unnatural growth rates and the refusal to eat natural foods. Certain foods may prove toxic despite the tortoises enjoyment of them, including legumes, tomatoes and cabbage. The animals eat small amounts of fruits as supplementary nutrition, however this should only be given occasionally

Around midday, the sun becomes too hot for the tortoises, so they return to their hiding places. They have a good sense of direction to enable them to return. Experiments have shown they also possess a good sense of time, the position of the sun, the magnetic lines of the earth, and for landmarks. In the late afternoon, they leave their shelters again and return to feeding.

In late February, Hermann's tortoises emerge from under bushes or old rotting wood, where they spend the winter months hibernating, buried in a bed of dead leaves.[6] Immediately after surfacing from their winter resting place, Hermann's tortoises commence courtship and mating.[6] Courtship is a rough affair for the female, which is pursued, rammed, and bitten by the male, before being mounted. Aggression is also seen between rival males during the breeding season, which can result in ramming contests.[7]

Between May and July, female Hermann's tortoises deposit between two and 12 eggs into flask-shaped nests dug into the soil,[7] up to 10 cm (3.9 in) deep.[6] Most females lay more than one clutch each season.[7] The pinkish-white eggs are incubated for around 90 days and, like many reptiles,[7] the temperature at which the eggs are incubated determines the hatchlings sex. At 26 °C, only males will be produced, while at 30 °C, all the hatchlings will be female.[6] Young Hermann's tortoises emerge just after the start of the heavy autumn rains in early September and spend the first four or five years of their lives within just a few metres of their nests.[7] If the rains do not come, or if nesting took place late in the year, the eggs will still hatch, but the young will remain underground and not emerge until the following spring. Until the age of six or eight, when the hard shell becomes fully developed, the young tortoises are very vulnerable to predators and may fall prey to rats, badgers, magpies, foxes, wild boar, and many other animals. If they survive these threats, the longevity of Hermann's tortoises is around 30 years.[6] One rare record of longevity is 31.7 years.[14] Compared to other tortoises (e.g. Testudo graeca),[14] the longevity might be underestimated and many sources are reporting they might live 90 years[15] or more.

Breeding

A female of T. h. boettgeri subspecies laying eggs in soil pit

A hatchling of T. h. hermanni

Breeding and upbringing of Hermann's tortoises are quite easy if kept in species-appropriate environments. The European Studbook Foundation maintains stud books for both subspecies. With the help of ultraviolet light-emitting bulbs (UVa and UVb, such as Repti Glo and Creature World), the correct environment for breeding can be created and bring tortoises into breeding condition.

• Mediterranean tortoise
• List of reptiles of Italy
• Jackson ratio

This article incorporates text from the ARKive fact-file "Hermann's tortoise" under the Creative Commons Attribution-ShareAlike 3.0 Unported License and the GFDL.

Wikimedia Commons has media related to Testudo hermanni (Hermann's tortoise).

• Avise, John C.; Bowen, Brian W.; Lamb, Trip; Meylan, Anne B. & Bermingham, Eldredge (1992). "Mitochondrial DNA evolution at a turtle's pace: evidence for low genetic variability and reduced microevolutionary rate in the Testudines". Mol. Biol. Evol. 9 (3): 457-473. PDF fulltext.
• de Lapparent de Broin, France; Bour, Roger; Parham, James F. & Perälä, Jarmo (2006). "Eurotestudo, a new genus for the species Testudo hermanni Gmelin, 1789 (Chelonii, Testudinidae)". Les Comptes rendus de l'Académie des sciences 5 (6): 803-811. doi:10.1016/j.crpv.2006.03.002 PDF fulltext. (in English with French abstract).
• Fritz, Uwe; Kiroký, Pavel; Kami, Hajigholi; Wink, Michael (2005). "Environmentally caused dwarfism or a valid species - Is Testudo weissingeri Bour, 1996 a distinct evolutionary lineage? New evidence from mitochondrial and nuclear genomic markers". Mol. Phylogenet. Evol. 37 (2): 389–401. doi:10.1016/j.ympev.2005.03.007 PDF fulltext.
• Fritz, Uwe; Auer, Markus; Bertolero, Albert; Cheylan, Marc; Fattizzo, Tiziano; Hundsdörfer, Anna K.; Sampayo, Marcos Martín; Pretus, Joan L.; Široký, Pavel; Wink, Michael (2006). "A rangewide phylogeography of Hermann's tortoise, Testudo hermanni (Reptilia: Testudines: Testudinidae): implications for taxonomy". Zool. Scripta 35 (5): 531-548. doi:10.1111/j.1463-6409.2006.00242.x PDF fulltext.
• van der Kuyl, Antoinette C.; Ballasina, Donato L. Ph.; Zorgdrager, Fokla (2005). "Mitochondrial haplotype diversity in the tortoise species Testudo graeca from North Africa and the Middle East". BMC Evol. Biol. 5: 29. doi:10.1186/1471-2148-5-29 (HTML/PDF fulltext + supplementary material).
• Henley, Jon (December 9, 2005). "Rare tortoise puts brakes on high-speed train link". The Guardian. Retrieved 2008-07-22.
• Hermann's tortoise media from ARKive .
• Guide to keeping Hermann's Tortoises.
• Breeding Hermann's Tortoises.