Yasmina is a humble dry lake at the base of the impressive Erg Chebbi Dunes, on the northern fringe of the Sahara Desert in Morocco. It is in a relatively remote area in the heart of the Maghreb, attracting tourism for camel caravans and for wayfaring birders with a taste for sandstorms. An early spring inspection of the tamarisk trees bordering Yasmina’s shores will reveal a great assemblage of Phylloscopus and Sylvia warblers nervously hopping around the trees and understory. They are here making a migratory stopover- a stop of a few days to weeks to replenish energy reserves after having just crossed the formidable Sahara. Upon successfully refueling fat and muscle reserves at Yasmina, the birds then continue their journey to European breeding grounds.
A keen observer would notice a great deal of the Subalpine Warblers (Sylvia cantillans) are wearing colorful plastic rings on their legs. This species is particularly interesting to me because they obtain and aggressively defend small transient territories. Subalpine Warblers are often heard broadcasting their chattering songs signaling to their neighbors the boundaries of their territories. If these boundaries are intruded upon, a chase or physical altercation often ensues. But again, this is not their breeding site, so why are these birds spending valuable time and energy (both are limiting currencies for migration and subsequently for life history strategies) where there is no mate to defend in a location that is still far from their breeding areas? To begin elucidating this phenomenon I am examining the interactions between stopover behavior, refueling performance and hormonal programs. Every day I map each individual’s home range (by sighting their individualized color-ring combinations) and assess territoriality with playback experiments and hormone analysis.
However, now in the later part of spring, a new suite of species dominates the stopover site. The Reed, Isabelline, Saharan Olivaceous, and Melodious Warblers are some of the commoner tenants in our nets. These four members of the Acrocephalidae family, exhibit markedly diverse stopover strategies. For example, upon arrival, some spend the entire day hidden in the shade of a tree to conserve energy and immediately leave when night falls- while others actively forage in the heat and stay for weeks. In addition these species spend winters in different habitat types- therefore adaptations to desert conditions may vary. Here, along with Ivan Maggini, I am examining the relationship between stopover strategy, physiology and habitat adaptations. We are measuring physiological output with a respirometry device and collecting tissues for stable isotope analysis that provide us with information about each individual’s wintering habitat. These birds are then fitted with activity tags that send signals to an antenna and are stored on a hard drive. From the changes in tag signal strength we can infer movement patterns and calculate activity budgets. We hope to understand how activity levels in a dry and hot desert are influenced by physiology and non-migratory habitat adaptations.
Whether from hyper aggressive territoriality, or physiological adaptations, birds display a great diversity of strategies to make use of desert stopover sites every year on their incredible trans-continental journeys. A worthwhile phenomenon to study in further detail!
We are happy to announce that the data collection for this year’s spring migratory field season on the island of Ponza has officially started in the beginning of April! PhD students Andrea Ferretti and Julia Slezacek and Master students Benjamin Kostner and Caroline Denechaud have spent the beginning of this month setting up the field site laboratory and field equipment to kick off this year’s data collection. Indeed, the preparatory work has already paid off and we have been able to collect the first samples and host the first Garden Warblers (Sylvia borin) and Common Whitethroats (Sylvia communis) in our registration cages for this season’s studies. This year we are investigating the influence of gut hormones on behaviour and physiology during stopover with a great focus on the hormone ghrelin and the genetics of the bird ghrelin system. In addition, we continue collecting data on sleep behaviour and have started a novel project on bird gut microbiota during migration.
For detailed information on the ringing activities and regular updates on the progress of the ringing season please check out our collaborator’s and local ringing station’s website.
If you would like to get involved in our research on migration physiology next spring season 2020, please contact Julia Slezacek for more information.
Hi, I am Elisa Perinot, I am launching a crowdfunding campaign on Experiment.com to collect funds to buy several GNSS loggers for my project on costs and benefits of flight formation. These loggers are necessary to track the birds while flying and I will use them to collect data during my next field season, in the summer.
You can help me to conduct my research by funding my project (see in the link)! Moreover, you can also share the campaign, so that I reach out to more people. For any question or curiosity, you are welcome to contact me.
Thank you very much!
On February 27th, 2019, this year’s field season in the oasis of Yasmina, Morocco, will kick off. The focus of the station, jointly run by the Konrad Lorenz Institute of Ethology and the Institut Catala’ d’Ornitologia, is to investigate different strategies used during stopover of migratory birds when landing in the desert. Armando Aispuro will be investigating territorial behaviour in Subalpine Warblers (Sylvia cantillans) and Woodchat Shrikes (Lanius senator). In addition, we will study the link between physiological adaptations to arid environments (e.g. differences in evaporative water loss) and behaviour at stopovers using automated radiotelemetry. We will study four closely related species along a gradient of arid habitat adaptations: Saharan Olivaceous Warbler (Iduna pallida reiseri), Western Olivaceous Warbler (Iduna opaca), Melodious Warbler (Hippolais polyglotta), and Eurasian Reed Warbler (Acrocephalus scirpaceus).
The field site will function as a bird ringing station and volunteers are welcome. Click on the link below for more information:
We welcome collaborations with people interested in the field site for their own research. Please contact Dr. Ivan Maggini (email@example.com).
Monti, F., Duriez, O., Dominici, J. M., Sforzi, A., Robert, A., Fusani, L., & Grémillet, D. (2018). The price of success: integrative long‐term study reveals ecotourism impacts on a flagship species at a UNESCO site. Animal Conservation 21: 448–458 .
This paper is the result of a collaborative project together with French and Italian partners aimed at understanding the impact of tourism on Mediterranean Osprey population. You can access the full paper at this link.
In summer 2018 we started a new project entitled ‘Learning to be attractive’. The aim is to understand if and how Australian spotted bowerbirds learn aspects of their courtship display from other males.Read More