Egg diversity

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Bowerbird eggs in the ANWC collection

We’re spending a few days in Canberra at the amazing egg collection in the Australian National Wildlife collection, measuring variation in size, coloration and patterning across the Australian passerines. The data will be analysed as part of our ongoing research into the way that the environment affects nesting and reproductive investment. The collection holds specimens from most species and reveals the stunning diversity across birds in the amount of pigmentation and patterning.

 

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Why is there so much variation in colour and patterning?

Drone workshop at Fowlers

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A UAV working at Gap Hills, one of our long-term study sites at Fowlers Gap

UAV’s or drones are┬áincreasingly being used┬áin environmental science, as a great way of gathering imagery and deploying sensors. In mid September, Richard Lucas, from UNSW organised a fantastic meeting, which brought together a range of different UAV’s and sensors for a few days of frenetic data gathering. We were lucky enough to get involved, and helped to set up ‘challenges’ and ground truth some of the data acquired. The data that has now been gathered in Lake Paddock (the central area for the chestnut-crowned babbler project), and Gap Hill (the key area for our work on zebra finches), will provide excellent insight into the link between landscape, vegetation and avian ecology, once it is all processed and analysed.

The evolution of nest shape

Although not yet published there is a nice story in Science News about our work on the

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The domed nest of a zebra finch

evolution of nest shape. The story can be found here. The work is currently under review for publication but was presented by lead author Jordan Price at the recent North American Ornithological Congress. Jordan did this work with us whilst on Sabbatical early this year.

The cost of being social

One of the papers from Enrico Sorato’s PhD work was published today in the Journal of Animal Ecology. In the paper, we showed that in the chestnut-crowned babbler,

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Chestnut-crowned babbler (picture Jodie Crane)

individuals suffer a cost of hanging around with their group mates, even if they are not actively involved in feeding offspring. That’s because over the course of a breeding attempt the foragers have to move further into the territory away from the nest to find enough food, incurring greater costs of moving and foraging. This cost, which has not been considered before may help to understand individual decisions about when to stay and when to leave a social group, and will contribute to the optimal group size. The paper is entitled The price of associating with breeders in the cooperatively breeding chestnut-crowned babbler: foraging constraints, survival and sociality, and can be found here.

Sam arrives in Norway to work on the SNP data from the Australian sparrows

SamNorwayASam is currently in Norway working with the house sparrow genetics group in Trondheim to look at SNP data from the Australian sparrows. During his trip, he is being hosted by Glenn-Peter Saetre in Oslo and Henrik Jensen at NTNU in Trondheim. This molecular work should provide a high level of coverage for population genetics and history and hopefully also for looking at selection across the different Australian climates.