English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Temperate bird species usually have breeding seasons that begin in the spring, when reproduction starts synchronously. Gonadal development is controlled by the photoperiod in many temperate bird species (e. g., Lofts & Murton 1973). For tropical birds, however, change in photoperiod has not been regarded as a proximate environmental cue for the timing of reproduction, because the change in photoperiod is small in the tropics (e. g., Voous 1950, Miller 1959). However, recent studies indicate that many tropical birds do breed seasonally, and that gonadal development responds to slight changes in photoperiod (Chandola-Saklani et al. 1990, Hau et al. 1998, Stutchbury & Morton 2001). A neotropical bird, the Spotted Antbird (Hylophylax n. naevioides), even responded physiologically to a photoperiod increase of only 17 minutes (Hau et al. 1998). Photoperiod is probably an initial cue for physiological preparation for reproduction in many tropical birds, as it is in numerous temperate-zone birds. However, tropical birds may use supplementary cues, such as rainfall and temperature change, to fine-tune the onset of reproductive activities. For example, Baya Weavers (Ploceus philippinus) in India prepare physiologically for reproduction when day length increases, and they then use rainfall as a final stimulus for nest-building and egg-laying (Chandola-Saklani et al.1990). Heron Island Silvereyes (Zosterops lateralis) engage in nest-building activity after heavy rainfall (Kikkawa & Wilson 1983), and two species of Darwin's Finch on Isla Daphne Major, Geospiza fortis and G. scandens, begin breeding shortly after the onset of rain (Boag & Grant 1984). In these species, rainfall was associated with an abundance of insects and seeds, on which the birds feed. The Rufous Vanga (Schetba rufa) is endemic to Madagascar and inhabits both dry deciduous forest and rainforest (Langrand 1990). From 1994 to 2000, we conducted a field study of the Rufous Vanga at Ampijoroa Forest Station in Ankarafantsika Strict Nature Reserve (16°15'S, 46°48'E), which is characterized by dry deciduous forest and

Environmental Cues that Initiate Reproduction in the Rufous Vanga(Schetba rufa).