Occurrence and diversity of Lichens in Abraka and its environs, Delta State, Nigeria
This study evaluates lichens diversity in Abraka and its environs for the period of six months (January – June, 2017). Data were collected by direct observation and transect walks in and around the study area. Photographs were taken to aid identification of the genera encountered with their hosts. Percentage distribution of the species was calculated. The result revealed the percentage occurrence and diversity of three forms of lichens: crustose (57.1%), foliose (28.6%) and leprose (14.3%). The lichen genera recorded with their percentage occurrence included Candelariella (22%), Chaenotheca (2%), Cyphelium (14%), Parmelia (16%), Lecanora (18%), Physcia (18%) and Psilolechia (10%). Monthly distribution showed that month of May had the highest occurrence (30%) of lichens. The weather pattern showed highest temperature in May (30.7°C), highest mean rainfall (442.6mm) and humidity (90.0%) in June. The result showed that the study area has varying lichen diversity which could be employed in bio-monitors of the environment.
Keywords: Occurrence, diversity, Lichen, Abraka.