[OANNES Foro] Raking the ocean surface : new patterns of coordinated motion in seabirds

[Mario Cabrejos]

Journal of Avian Biology

First published: 23 March 2020

 <https://doi.org/10.1111/jav.02258> https://doi.org/10.1111/jav.02258

Raking the ocean surface : new patterns of coordinated motion in seabirds


<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Assali%
2C+Camille> Camille Assali
<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Bez%2C+
Nicolas> Nicolas Bez
<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Trembla
y%2C+Yann> Yann Tremblay

Abstract

Coordinated movements of seabirds exploiting a prey patch are known to
increase prey encounter and capture rates of individuals. These behaviours,
based on effective cooperation between seabirds, have only been reported at
small scale, i.e. the scale of the prey patch. However, the efficient prey
exploitation by seabirds in vast oceans require larger scale processes such
as information transfers between individuals. Indeed, information transfers
between foraging seabirds (e.g. changes in behaviour) reduce their search
cost while increasing their prey encounter rate. Whether or not these
information transfer processes imply active cooperation is unknown. Using
images from fishing boat radars in the eastern tropical Atlantic, we show
the existence of frequent medium‐scale patterns of coordinated flights of
seabird groups, consisting in seabird fronts (“rake” patterns) of 0.3 to
4.4 km width, displacing cohesively over 1.2 to 10.6 km and lasting between
2 and 19 min. For these rakes to be maintained, seabird groups have to
adjust their flight speeds and directions, while they are on average distant
of 500 m from each other, what cannot occur by chance. These findings
suggest the existence of collective and coordinated movements in seabirds
during prey searching at several kilometres' scale. This potential
cooperation between foraging seabird groups brings new insight in the
evolutionary trajectories of seabirds life‐style.





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