A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.
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Transcript of A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.
![Page 1: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/1.jpg)
A problem in paradise: The vanishing Picobar Tree Frog
Geoff HydeNCBSYETI 2009Bangalore
![Page 2: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/2.jpg)
Species Unique to Picobar346 plants209 insects37 birds14 mammals11 reptiles and amphibians
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Picobar Tree Frog
Dyscophus picobari
DiurnalInsectivorousMid-altitudesPopulation declining
How can the population decline of the Picobar Tree Frog be halted?
![Page 4: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/4.jpg)
Possible players in the population decline of the Picobar Tree Frog
Rat Snake(Ptyas mucosa)Introduced 1999
Picobar Lady Beetle(Harmonia picobari)Threatened by fungi
![Page 5: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/5.jpg)
Is population decline due to increased predation or decreased prey?
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If increased predation…..
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… we should see snakes eating frogs
Objective 1: Do starved captive rat snakes eat Picobar Tree Frogs?
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Preparation for exposure to frogs
27oC + 36oC
Replication : 20 snakes
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Snakes offered two species of frogs
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Snakes ate the brown frogs
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Tree frogs uneaten after one week
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What if snakes do not have a choice?
27oC
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Tree frogs only, offered for one week
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Snakes sometimes attacked tree frogs...
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...but quickly spat them out.
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After one week, no frogs eaten
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Objective 1: Do starved captive rat snakes eat Picobar Tree Frogs?
No
![Page 18: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/18.jpg)
If decreased prey, frogs should strongly prefer Lady Beetles
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Objective 2: Do starved, captive Picobar Tree Frogs
strongly prefer Picobar Lady Beetles ?
![Page 20: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/20.jpg)
27oC
Preparation for exposure to insects
Replication : 20 frogs
![Page 21: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/21.jpg)
Frogs offered five species of insects
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Frogs targeted the Lady Beetles
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5% Lady Beetles, 75% Brown Beetles, 100% of other species remain after a week
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27oC
What if frogs can't choose Lady Beetles?
Replication : 20 frogs
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Frogs offered 4 species (no Lady Beetles)
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45% of Brown Beetles, 100% of other species, remain after a week
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Objective 2: Do starved, captive Picobar Tree Frogs strongly prefer Picobar Lady
Beetles ?
Yes
![Page 28: A problem in paradise: The vanishing Picobar Tree Frog Geoff Hyde NCBS YETI 2009 Bangalore.](https://reader033.fdocuments.in/reader033/viewer/2022051516/56649ebc5503460f94bc49ab/html5/thumbnails/28.jpg)
• Very unlikely due to Rat Snakes
Is decline of Picobar Tree Frogs due to increased Rat Snake predation or
decreased availability of Lady Beetles?
• Results support Lady Beetle hypothesis- need support from field studies - preliminary data is suggestive
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• Breed fungal-resistant Lady Beetles
• Captive breeding program for tree frogs
Suggestions for management of population decline
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