Since " Polistes " social parasites are very rare, these altitudinal migrations also give them an advantage.
12.
Parallels in altitudinal migration with the equally solitary mockingbird might be taken as indication that the breeding activity peaked around March April.
13.
For example, birds that engage in altitudinal migration might make " trial runs " lasting a few hours that would induce physiological changes that would improve their ability to function at high altitude.
14.
In the tropics there is little variation in the length of day throughout the year, and it is always warm enough for a food supply, but altitudinal migration occurs in some tropical birds.
15.
In New Zealand, " T . sanctus vagans " shows altitudinal migration, with post-breeding movement from higher altitudes to the coast and also from forest to coast and open lands.
16.
Through years of evolution, flora of the lowland rainforest, typical from Sarapiqu?and Tortuguero, had an altitudinal migration to 500-600 m high, and flora of the highlands did not descent to less than 300 m.
17.
Furthermore, climate change may cause seasonal storms and rainfall patterns to change, shifting the timing and / or need for altitudinal migration in the future by shifting availability of resources, which is believed to be a driving cause of altitudinal migration.
18.
Furthermore, climate change may cause seasonal storms and rainfall patterns to change, shifting the timing and / or need for altitudinal migration in the future by shifting availability of resources, which is believed to be a driving cause of altitudinal migration.
19.
This species is believed to be a relict species breeding in open old-growth stands of the conifer Faber's fir ( " Abies fabri " ) at high altitude ( 2, 500-2, 830 m ), although it is thought to undertake localised altitudinal migrations in the winter ( occurring down to at least 1, 600 m ).
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