Fire Suppression as Well as Seed Dispersal Play Critical Role in the Establishment of Forest Tree Species in Tropical Woodland

This study examined the mechanisms of facilitation and importance of seed dispersal during establishment of forest tree species in a tropical woodland. Seedling survival of Syzygium guineense ssp. afromontanum seedling (forest tree species) was monitored for 2.5 years in four different microsites in savannah-woodland in Malawi under Ficus natalensis (a potential nurse plant), Brachystegia floribunda (a woodland tree), and Uapaca kirkiana (a woodland tree), and in a treeless site. S. guineense ssp. afromontanum seed deposition was also monitored in the four sites, and the natural establishment of forest tree species was observed to confirm the importance of seed dispersal. Protection from fire was found to be the most important facilitation mechanism in this area, with a total fire-induced mortality rate of 43%. However, the rate was comparatively low under F. natalensis, where fire is thought to be inhibited due to the lack of light-demanding C4 grasses. B. floribunda also offered protection from fire, and seedling survival did not differ between these two microsites. However, only a few individual forest tree species naturally established under B. floribunda, indicating that the facilitative mechanism of fire suppression is not the only factor affecting establishment in this tropical woodland. A higher rate of seed dispersal was also observed under F. natalensis compared with the other three microsites, suggesting that dispersal processes are also critical for the establishment of forest tree species in woodland in this region.

First confirmed record of Chestnut-backed Button-quail Turnix castanotus in Queensland

The Chestnut-backed Button-quail Turnix castanotus is widely distributed in monsoonal tropical woodland but previously known only from the Northern Territory and Western Australia. Here we provide the first verified record in Queensland. We observed at least eight birds during October and November 2020 at Westmoreland Station, which is located in far north-western Queensland. These observations represent a significant (~215 km) easterly range extension and are the first confirmed records of this species for Queensland. Chestnut-backed Button-quail had gone undetected in Queensland likely owing to the difficulty in locating and identifying button-quail generally and the low number of birdwatchers in the region. A potential record made by W.R. McLennan in 1910 may represent a previously unreported record of this species in Queensland. Here we describe our observations in 2020 and the habitat where the species was recorded.