Areas delivering more effective ancillary or secondary biodiversity conservation, such as water catchment areas and traditional land management systems that maintain high levels of biodiversity.
Ardaloedd sy'n darparu cadwraeth bioamrywiaeth ategol neu eilaidd fwy effeithiol, megis dalgylchoedd dŵr a systemau rheoli tir traddodiadol sy'n cynnal lefelau uchel o fioamrywiaeth.