Communication 2 CASE STUDIES:

Präsentation zum Thema: "Communication 2 CASE STUDIES:"—  Präsentation transkript:

1 Communication 2 CASE STUDIES:
The evolution of the honeybee dance language

2

3 Karl von Frisch 1886-1982 (Nobel prize 1973)

4 How does the dance encode direction?

5 Prof. Lindauer goes to the tropics

6 Apis cerana – the Asian hive bee
                                                                 

7 Apis dorsata – the giant honeybee (or rock bee)
up to 1 inch long

8 Apis florea – the dwarf honeybee
dorsata and florea in comparison

9 Apis florea (dwarf honeybee) nest
dances are performed on the horizontal surface, waggle run directly oriented to the food source

10 The evolution of the dance language

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12 Forager behavior Dornhaus & Chittka, Nature 1999
Excited running for 13s to 10min (average 2,6 min)

13 From: Chittka & Dornhaus 1999

14 How can we measure the adaptive benefits of communication?
The bee dance language as a model

15 Jamming the information content of the waggle dance

16 oriented dance disoriented dance

17 Measuring foraging success
Daily weight changes of a beehive can be measured on a scale - this reflects mostly nectar intake Gewichtsänderungen könne groß sein: bis zu 2kg am Tag Gewinn und einem knappen Kilo Verlust bei einem 10frame Stock -> das kann nur Nektrareintrag bzw. Honigverbrauch sein. Möglichst große Wintervorräte limitierend für Erfolg laut Literatur In unseren Tests: Gewichtsänderung abhängig vom Angebot, bei höherem Angebot mehr eingetragen Ausserdem messen wir die Nektarladungen von einzelnen Sammlerinnen, um den Nektareintrag pro Zeit und Sammlerin zu bestimmen. 12,035 kg

18 Temperate habitat (Central European)

19 Temperate habitat (Mediterranean)

20 Tropical habitat (India)
- days of high nectar intake are missing without location communication

21 Benefits of dance communication are limited to the tropical habitat

22 temperate

23 tropical

24 Spatial aggregation in tropical and temperate habitats
Tropics Temperate

25 The honeybees originated in tropical Asia