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A timeline for the urbanization of wild birds: The case of the lesser kestrel

The Lesser kestrel (Falco naumanni) evolved as a separate species in the Old-World kestrel radiation starting in the late Miocene. Given that the first cities were erected in the Holocene, this urban colonial raptor has only become a major town dweller recently in its evolutionary history. Today, more than 95% of lesser kestrel colonies in Spain and other Mediterranean countries are on buildings, and the remaining few are on rocky outcrops, that may have been the original nesting substrate for this cavity-nesting bird. Lesser kestrel fossils are well represented in cave sites, and their paleontological distribution, spanning from the Early Paleolithic to the Epipaleolithic, agrees well with its current breeding distribution. According to classical sources, such as the works of Columella and Pliny the Elder, and the presence of a skeletal remain in a Roman villa near Madrid, lesser kestrels may have nested in buildings and in urban settings for at least 2000e2500 years. However, there are no surviving colonies in structures older than 1400 years in Andalusia, nor in Spain. For a sample of 349 colonies on ancient buildings, a majority of the structures had been erected between the 15th and 17th centuries, this putting a time limit of about 300-600 years to the existence of those seemingly immemorial colonies. For specific towns and buildings, written references for the presence of lesser kestrel colonies do not go back more than two centuries. In fact, the Cathedral of Sevilla may be the structure with the longest continuous occupation by lesser kestrels recorded up to present time, from 1834 to 2020. Lesser kestrels were possibly too common in human settlements in the past as to be noted as special. This may explain the scarcity of references to the species until the 19th century. In any case, the same lack of information affects the other major Eurasian urban birds, as no timeline exist for the urbanization process of any other bird species. Here authors propose that lesser kestrels became urban breeders when both adequate cavities in buildings and cereal fields, where they capture their invertebrate prey, became available in their breeding range, several millennia ago. However, urban colonies, in contrast with the ones on stable geological substrates, have been forced to move from building to building when older ones became ruinous or were rebuilt, but new structures with suitable cavities became available throughout History. informacion[at] Negro et al (2020) A timeline for the urbanization of wild birds: The case of the lesser kestrel. Quaternary Sci Rev
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The role of immigration in the growth of a population of glossy ibis in Doñana

The role of immigration in the growth of a population of glossy ibis in Doñana

Immigration and local recruitment play a central role in determining the growth rate of breeding populations. Unravelling these processes in newly-established populations is of great importance to increase understanding of how species change their distributions in response to global change. In this study, these processes were analyzed through the monitoring of a glossy ibis population in Doñana from the settlement of the colony in 1996. The impressive growth of this population due to immigration (from 7 couples to over 8,000 in twenty years) has directly fueled the expansion of the species in the Mediterranean area and Western Europe. In terms of metapopulation, the Doñana population has rapidly changed its status from sink to source population, thanks mainly to immigration. The pull factors in Donana must have been very significant considering the high values of local demographic parameters such as reproductive success (average of 2.1 fledglings per pair) and the rate of self-recruitment which was particularly high (>80%)  for first-year individuals. Finally, this study highlights as immigration not only support populations at the limit of its range, but may also indirectly play a key role in the expansion process of a species. informacion[at] Santoro et al (2016) Immigration enhances fast growth of a newly-established source population. Ecology doi:10.1890/14-2462