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PDF 2.16 MB - Rīgas Zooloģiskais Dārzs

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2008, good results were attained using Fitoekol, an agent manufactured in Latvia for use in eradication<br />

of fungus infections in plants. In 2008 we started to experiment with use of medical herbs, notably garlic.<br />

Colleagues from Russia (Oleg Seletkin, Perm Zoo) suggested the use of live garlic plants in terrariums. The<br />

results exceeded any expectations – animal losses were reduced to minimum, and this method did not<br />

affect breeding negatively. Use of another herb, St John’s Wort Hypericum perforatum, gave good results,<br />

too. Ilze Dunce gave the presentation on use of medical plants during Bombina bombina LIFE project final<br />

conference in Germany. Currently the use of garlic is adopted by several other amphibian collections in<br />

Europe.<br />

Reptiles<br />

At the end of 2009, there were 63 species in Riga Zoo’s reptile collection. Four species bred in 2009,<br />

including Asian Water Dragons Physignathus cocincinus (17 young hatched in the incubator), Great Plated<br />

Lizards Gerrhosaurus major (3), Madagascar Giant Day Geckos Phelsuma madagascariensis (5) and Green<br />

Crested Basilisks Basiliscus plumifrons (19).<br />

Juvenile Nile Crocodile Crocodylus niloticus that was housed temporarily by the zoo in Tropical House<br />

grew well and became increasingly active, so we had to remove the animal from the exhibit to more safe<br />

accommodation in off-public premises. Search for a new home for the animal was started, and the end of<br />

the year brought good news that the young female crocodile will be welcome to Tropicario, Helsinki.<br />

The former Mississippi Alligator exhibit in Tropical House could be more convenient for keeping smaller<br />

crocodile species. On 20 October five young Dwarf Crocodiles Osteolaemus tetraspis were brought from<br />

Plzen Zoo.<br />

On 18 March 10 young Veiled Chameleons Chamaeleo calyptratus arrived from Lodz Zoo. That gave us<br />

a possibility to renew the species exhibit in Terrarium. Towards the end of the year all the three females<br />

started laying.<br />

Another additions to our reptile collection were three Asian ratsnake species and subspecies – Elaphe<br />

mandarina, E. porphyracea laticincta and E. porphyracea coxi.<br />

Birds<br />

At the end of 2009, there were 82 bird species in Riga Zoo’s collection. 13 species bred in 2009. The year<br />

was not very happy for our bird collection, though.<br />

Several prospective bird pairs were lost during 2009. Deaths included female Hamerkop Scopus umbretta<br />

(ovaritis and egg binding), female Great Grey Owl Strix nebulosa lapponica (metabolic problems) and male<br />

Hawk Owl Surnia ulula (the most probable cause was thyroid hyperfunction). The loss of Hawk Owl was<br />

especially disappointing as only a month ago a female for pair forming arrived from Monticello Breeding<br />

and Conservation Centre. Egg binding occurred to our female Laughing Kookaburra Dacelo novaeguineae,<br />

too, but it was possible to save the bird.<br />

Snowy Owl Nyctea scandiaca chicks were lost for the second time, most probably wild Marten activity<br />

was to blame. East Great Cormorant Phalacrocorax carbo sinensis nest colony was devastated by wild Fox. A<br />

Sulphur-crested Cockatoo Cacatua galerita chick hatched on 27 January but died due to trauma on 17 April,<br />

in the next day after fledging.<br />

During last years Turkey Vulture Cathartes aura ruficollis breeding went without success, too. Of two eggs<br />

laid in February one disappeared, and the chick from the second egg died after hatching. Two next eggs of<br />

March resulted in dead embryos. The last two eggs were laid in May and broken by parents later on.<br />

The breeding attempts of Cinereous Vultures Aegypius monachus were unsuccessful for the third breeding<br />

season. First egg, laid on 6 March, was broken by parents after 10 days of incubation. On 10 April the second<br />

egg was laid, but embryo died just before hatching.<br />

Stanley Cranes Anthropoides paradisea had two clutches but all four eggs proved to be unfertile. The two<br />

previous breeding attempts had given the same result. Our observations showed that most possibly the<br />

male was not successful in copulation. The bird not only has got a pinioned wing but also fails to respond<br />

to female calls.<br />

Common Crane Grus grus grus pair produced three eggs. Two of them were destroyed by female, the third<br />

embryo died after ca. 3 weeks of development.<br />

The year of 2009 brought pleasant events, too. Manchurian Cranes Grus japonensis produced another two<br />

chicks. Several birds were distributed to other collections. Two young of this year went to Bussolengo Zoo,<br />

two young cranes from previous year were sent to Overloon Zoo and Cleres Zoo respectively. Our second,<br />

22

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