Inggar Damayanti, Iskandar Z. Siregar and Sri Rahayu, “Asosiasi Pohon dengan Epifit Hoya spp. di Taman Nasional Bukit Duabelas,” Jurnal Silvikultur Tropika 8(3):191–196 (December 2017). Journal record · Original PDF. The journal page lists an online publication date of 19 March 2018.

What was studied

From 30 August to 12 September 2015, the authors sampled nine 20 × 20 m plots selected around known Hoya in Bukit Duabelas National Park, Jambi. They report four taxa (H. rintzii, H. revoluta, H. coronaria and provisionally identified H. cf. caudata) on 12 of 71 trees. The measured associations between a particular Hoya and tree species were weak in this sample; the study does not establish a rule for every site or species.

Reading limits

Methods list three Hoya taxa, whereas Results list four. The paper states nine plots yet gives plot-frequency percentages that do not readily reconcile with nine; it also prints 25.64% for crown positions in Table 1 and 25.66% in the narrative. It calls 68.75% visual canopy cover the proportion of light reaching the ground, but canopy cover is not a light measurement. Air temperature (26.90–30.90 °C) and relative humidity (76.60–85.10%) describe the short survey at these plots. The exploratory habitat associations and co-occurring ant nests do not establish cultivation targets or a causal mechanism.