Here, we present empirical data on the species richness of woodland-dependent birds collected systematically from 24 landscapes (each 100 km2) that sample a gradient in habitat cover from <2% to 60%.
Thirty-six fromes from the fourth example of Pileated escape flight, which most resembled the flight path of the Luneau video bird, were analysed systematically frame by frame.
However, no global dosage compensation mechanisms have been detected in the two independent ZW systems that have been studied systematically (birds and silkworm), leading to the suggestion that lack of global dosage compensation may be a general feature of female-heterogametic species.
Model performance degraded continuously with increasing grain size, both in habitat generalist and habitat specialist bird species, and was systematically lower in habitat generalists.
The birds proceeded slowly and systematically, incrementally working out each transition (e.g., from C to B, and B to A).
As these rates may have been influenced by local publicity, we quantified incidence in a network of garden sites where diseased birds were searched for systematically according to a defined protocol throughout the study period.
Birds were located by systematically traversing each study site and searching for individuals of each focal species (Vanderwerf 1994; Pejchar et al. 2005).
In most regions, sampling among wild birds was only done systematically after a poultry outbreak in that region, except in the central northwest, central north, and central central regions.
According to the RSPB, the last two breeding pairs of hen harriers in England failed this year to produce eggs for the first time in 60 years and are now on the point of extinction because gamekeepers working for rogue moorland estate owners have systematically persecuted the bird to protect baby grouse which live on the moors.
In these experiments, we systematically controlled for bird density, pen size, and previous social experience in groups of different sizes.
