Pale blue eggs were more frequent among cuckoos than parrotbills, but the biological significance of this difference is unclear, as it may simply have resulted from the huge inequality in sample sizes of host and cuckoo eggs.
Furthermore, the population size of hosts is effectively infinite and intra-host drift is not considered.
Evidence for the importance of host density explaining specialization by parasites came mainly from plant-phytophagous insect systems [see, [ 4]] where apart from size of hosts, host density per se is an important variable reflecting predictability of resources for adults or larvae.
When comparing the body size of hosts infected versus uninfected, we pooled exposed but uninfected and non-exposed individuals as they did not differ in size (linear model with data from Experiment 2, P > 0.5; and with data from Experiment 4, P > 0.05).
Compared with free-living bacteria, symbionts that undergo strict vertical transmission experience some important differences in lifestyle, including population bottlenecks every generation from vertical transmission, further restriction by the population size of hosts, and asexuality (Moran 1996; Mira and Moran 2002).
Or they could point out that, in 2001, Britain ranked only ninth among EU countries for the number of asylum applications it received, relative to the size of host populations.
The findings were seen not only to be applicable to the management of grouse populations but also to be indicative of how regional changes in climate could result in local changes in parasite burdens that lead to concurrent changes in the size of host populations.
This result indicates that inclusion of H2 atom within empty small cage changes size of host cages depending on type of guest molecule.
The cost of eviction is also likely to vary with the size of host eggs and nestlings, as well as the nest structure [12], [17].
