Bell Miner Associated Dieback (BMAD) Mapping for the Gondwana Rainforests of Australia Border Region 2013

Bell Miner Associated Dieback (BMAD) mapping for the border region of the Gondwana Rainforests of Australia World Heritage Area most likely undertaken as a Caring for Country project. Prepared for Department of National Parks, Recreation Sport and Racing August 2013 by Tree Crop Technologies Pty Ltd (TCT).\r\n\r\nBell Miner Associated Dieback (BMAD) has been identified as a key threat to Gondwana Rainforests WHA values. BMAD occurs where there is an over-abundance of sap sucking psyllid insects and the associated establishment of dense colonies of Bell Miners, leading to a decline in forest condition. BMAD affects a broad range of sclerophyllous communities, many of them dominated by eucalypt or related species. In many forests affected by BMAD, the ground stratum is lost or dominated by weeds, the original understorey structure is replaced by a dense mid-stratum favourable for high density colonies of Bell Miner, and the upper stratum is subject to a decline in vigour.\r\n\r\nNo severity classes only BMAD infected patches.

钟鸣鸟相关衰退（Bell Miner Associated Dieback, BMAD）制图数据集覆盖澳大利亚世界遗产地冈瓦纳雨林边境区域，该制图工作最有可能作为“乡野保育（Caring for Country）”项目开展。本数据集由树木作物技术私人有限公司（Tree Crop Technologies Pty Ltd, TCT）于2013年8月为国家公园、娱乐、体育与赛车部编制。

钟鸣鸟相关衰退（BMAD）已被认定为威胁冈瓦纳雨林世界遗产地保护价值的关键威胁因子。当吸汁木虱种群过剩，且伴随钟鸣鸟密集种群建立时，便会引发BMAD现象，进而导致森林健康状况下降。BMAD可侵染广泛的硬叶植物群落，其中多数群落以桉树或近缘物种为优势种。在诸多受BMAD影响的森林中，地表植被层消失或被杂草主导，原有的林下结构被利于钟鸣鸟高密度种群栖息的致密中层植被替代，上层植被则出现活力衰退。

本数据集仅标注BMAD感染斑块，未划分严重程度等级。