PDF 2.84 MB - Rīgas Zooloģiskais Dārzs

BEZMUGURKAULNIEKI
SAUSZEMES BEZMUGURKAULNIEKI
Insektârija kolekcijâ ir daþâdi sauszemes posmkâji,
to skaitâ skorpioni, putnuzirnekïi, zarkukaiòi, vaboles,
tûkstoðkâji u.c. 2007. gadâ ekspozîcijâ veiksmîgi
atjaunojâm divas iepriekðçjos gados zaudçtas sugas.
Ðogad arî pârskatîjâm kolekciju un atteicâmies no
daþâm mazâk interesantâm sugâm, bet 2008. gadâ
plânojam kolekciju papildinât ar vairâkâm jaunâm.
Jûnijâ mûsu kolekcijâ atgriezâs lapgrieþskudras
Atta cephalotes. Pirms tam pârtraukumu darbâ
izmantojâm formikârija uzlaboðanai, atrisinot tâ
ekspluatâcijas gaitâ raduðâs problçmas.
Atsâkâm eksponçt arî alu circeòus Phaeophilacris
bredoides, jo 2006. gadâ no Amsterdamas kolçìiem
saòemtâ jaunâ populâcija ïoti labi savairojâs.
2006. gadâ no kolçìiem Nîderlandç un Anglijâ
saòçmâm milzu zarkukaiòu Phobaeticus serratipes
olas no divâm daþâdâm populâcijâm. Tâpat kâ notika
mûsu lîdzðinçjâ populâcijâ un daudzâs citâs
kolekcijâs, arî no ðîm olâm izðíîlâs tikai mâtîtes, kas
turpmâk normâli dzîvo un vairojas partenoìençtiski -
izveidojas stabila partenoìençtiska populâcija. Tâ
mums neizdevâs atjaunot pilnvçrtîgu populâciju, kurâ
bûtu arî tçviòi, tomçr ðo zarkukaiòu milzîgâs mâtîtes
visu gadu lieliski "kalpoja” Tropu mâjas ekspozîcijâ.
Turpinâm piedalîties Fregates diþmelnuïu
Polposipus herculeanus EEP. Regulçjot kâpuru
daudzumu, 2007. gadâ uzturçjâm ap 130 vaboïu lielu
populâciju. Pirmâs paaudzes vaboles paðlaik râdâm
ekspozîcijâ Tropu mâjâ, bet otrâs un treðâs paaudzes
vaboles vairojas Insektârija telpâs, un drîz gaidâm
Ilona Roma
Insektârija vadîtâja (sauszemes bezmugurkaulnieki)
Diâna Tîfenberga
Akvârija zoologs (ûdens bezmugurkaulnieki)
Bezmugurkaulnieku kolekcija 2007. gadâ:
58 sugas gada beigâs
Vairojâs 41 suga
Platymeris sp. 'Mombo' - jauna laupîtâjblakðu suga kolekcijâ. Kreisajâ pusç -
jauns, labajâ - pieaudzis kukainis.
Platymeris sp. 'Mombo' - a new assassin bug species in our collection.
Left: larva, right: adult beetle.
Foto: Elîna Gulbe
INVERTEBRATES
At the end of 2007, there are 58 species in Riga Zoo invertebrate collection. 41 species bred in 2007.
In 2007 two species were reestablished in the exhibit at Tropical House. A new colony of Leaf-cutter ants Atta cephalotes arrived in June.
Prior to this, we improved the formicarium and solved the problems that were arisen during the work with the previous A. cephalotes colony.
The second species renewed in exhibit was African cave cricket Phoephidacris bredoides, as the population received from Amsterdam
colleagues in 2006 bred well.
In 2006 we received stick insect Phobaeticus serratipes eggs from two different collections in the Netherlands and UK. Unfortunately we
failed to establish a bisexual population (only females hatched from the eggs), but the gigantic stick insect females served well at the exhibit
in Tropical House.
We continue to maintain the populations of EEP species. Amphibian Department continues to work with Partula snails ( Partula radiolata,
P. tristis and P. varia), and Insectarium continues to work with critically endangered Fregate Island palm beetle Polposipus herculeanus. This
year we did not breed the species intensively, but controlled the number of larvae, maintaining ca. 130 beetles in the population.
In 2007 we received a new assassin bug species, Platymeris sp. 'Mombo' from colleagues from Latgale Zoo, Latvia. This species is
closely related to the other assassin bug species in our collection, P. biguttata, and we plan to exhibit both species in one terrarium.
The experiments with various substrate composition for our flower beetles continued. Following the advice of French colleagues, now we
use a new method of fermentation, as well as add llama faeces to the substrate.
In 2007 we started a new project. We would like to exhibit the Latvian ants to the visitors. Three colonies of Lasius niger (Black ants) were
formed. Currently we are trying to establish a formicarium design for safe keeping of ants. An exhibit of 2-3 native ant colonies would be of
interest for zoo visitors.
Insectarium Department reduced the food insect production this year, stopping the breeding of some insect species readily available from
suppliers ( Gryllus assimilis, Tenebrio molitor). Also, the breeding of fruit flies was taken up by Amphibian Department. We continue to breed
locusts Locusta migratoria and several cockroach species ( Gromphadorrhina portentosa, Shelfordella tartara, Blaptica dubia) in Insect
Quarantine facilities in the Old Elephant House. Insectarium supplied other zoo animal departments with 182.5 kg of live food insects in 2007.
This year we had to move a part of our premises to other facilities. The sanitary and disinfection measures allowed to free our insect
cultures of several pests. At last our collection is free from Phorid flies ( Megaselia scalaris) that previously affected our food insect cultures.
Aquarium Department maintains the exhibit of Marine Aquarium with several soft coral and sea anemone species. Our sea invertebrates
benefited much from installing of an artificial wave system. That improved both their growth and reproduction. During 2007, several new
polyps developed, including those of Litophyton, Discosoma, and Zoanthus.
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