New Jürgen Ott - L.U.P.O. / UFZ - Legato · 2016. 12. 16. · predators in the paddy fields...
Transcript of New Jürgen Ott - L.U.P.O. / UFZ - Legato · 2016. 12. 16. · predators in the paddy fields...
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Jürgen Ott - L.U.P.O. / UFZ
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• Philippines: > 300 species and many new ones
• in particular on islands and in remote
mountainous areas
• Vietnam: about 235 species (Do & Dang 2006)
– in 2014 already > 280 (Do pers. comm. 2014)
– actually > 300 (Do pers. comm. 2016)
– also new species near urban areas and even
near cities like Hanoi
• many undescribed, some (or many ?) still
undiscovered
• literature available, but still many gaps to fill
• need for a national database
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• complex ecology
• larvae aquatic
• adults terrestrial
• complex behaviour
• good indicators for:
• biotopes / biotope quality / biotope complexity
• impacts
• climatic and global changes
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„dragonfly food web“: who feeds on what ?
„actors“ involved:
- leafhoppers und planthoppers
- damselflies
- dragonflies
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„dragonfly food web“: who feeds on what ?
damselflies and dragonflies
are very important and
effective predators in the
rice / paddy fields
very beneficial !
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„dragonfly food web“: who much do they eat ?
Ischnura senegalensis
thanks to Dong & Leo (PhilRice)
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„dragonfly food web“: who much do they eat ?
Ischnura senegalensis
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„dragonfly food web“: who much do they eat ?
Ischnura senegalensis
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„dragonfly food web“: who feeds on what ?
GLH /BPH
7 – 12 minutes
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„dragonfly food web“: who feeds on what ?
GLH /BPH
3 – 5 minutes
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„dragonfly food web“: who feeds on what ?
BPH < 0,5 minute - damselfly / dragonfly 3 / 5 minutes
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„dragonfly food web“: who feeds on what ?
results:
- BPH and GLH are preyed by all damsel- and dragonflies
- damselflies prey also on sitting BPH + GLH, dragonflies
only on flying insects
- small damselflies are preyed by bigger damselflies
- all damselflies are preyed by all dragonflies
- smaller dragonflies are preyed by bigger dragonflies
-> damselflies and dragonflies are very important and
effective predators in rice fields – very beneficial !
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• rice fields as biotopes for dragonflies:
• special coenosis
• mostly euryoecious species
• mostly dragonflies and here libellulids (exophytic)
• adapted on the “rice cycle”
• different stages of the paddies
• early after planting: open waters, young paddies
• later: dense rice plants, mature paddies
• abondant paddies: more natural
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• neighboring biotopes for dragonflies:
• biotopes within the paddy-system
• ditches and channels
• brooks / rivers
• ponds
• biotopes in the surrounding area
• ponds / lakes
• marshes
• brooks / rivers
more natural and in / near forests
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• damselflies
Agriocnemis femina
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Brachythemis contaminata
Orthetrum
sabina
Neurothemis
tullia
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• dragonflies
Neurothemis fulvia
Orthetrum pruinosum + O. testaceum
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• dragonflies
Pantala flacescens
Crocothemis servilia
Diplacodes trivialis
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Nannophya pygmaea
Palpopleura sexmaculata
Diplacodes nebulosa
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Tholymis tillarga
Pseudagrion rubriceps
Brachythemis
contaminata
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Ictinogomphus decoratus
Sinictinogomphus clavatus
Trithemis annulata
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Rhodothemis rufa
Copera marginipes
Rhyothemis phyllis
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Heliocypha perforata
Neurobasis chinensis
Euphaea guerini
Mnais mneme
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Mnais mneme
important sources for
recolonisation of
paddy fields
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Mnais mneme
important sources for
recolonisation of
paddy fields
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Management for dragonflies: habitat enrichment
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Management for dragonflies: habitat enrichment
ponds at PhilRice in 2013
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Management for dragonflies: habitat enrichment
ponds at PhilRice in 2016
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- damselflies and dragonflies play a prominent role as
predators in the paddy fields (larvae/adults)
- they are good indicators for the habitat diversity
(species and coenosis/composition)
- easy management measurements through ecological
engeneering can improve their diversity and abundance
(effectiveness)
- they are beneficial, as they are relevant for pest control
and also economically of interest
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• paddy field coenosis / communities are typical
lowland – mountainous
stage: young --- > mature
• to some extent overlapping – potential for recolonisation
• coenosis of channels and brooks are different
• in total > 70 species (some more to be determined)
• mainly libellulids – few damselflies
• one species in all biotopes: Orthetrum pruinosum
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Aristocypha fenestrella
… save the flying dragons
in the rice fields – and nearby !