Digital Repository

Measurement of growth in the lichen Rhizocarpon geographicum using a new photographic technique

DSpace/Manakin Repository

Show simple item record

dc.contributor.author Henry, Nicole M.
dc.date.accessioned 2012-03-30T16:41:07Z
dc.date.available 2012-03-30T16:41:07Z
dc.date.issued 2012-03-30
dc.identifier.uri http://hdl.handle.net/10464/3941
dc.description.abstract Lichenologists and users of lichenometry have long used calipers or photogrammetry to measure the growth of crustose lichens. Now, digital photography and popular computer software provide methodological alternatives. This thesis developed and tested a new methodology for tracking change and growth of the lichen, Rhizocarpon geographicum. Adobe Photoshop CS3 Extended software and a photographic time series (1996,2003,2006 and 2007) were used to measure thallus diameter, area, prothallus width and areolae area in 115 small R. geographicum thalli (0.53-1049.88 mm2 ). Measures of 8 diameters per thallus showed that change in diameter was highly variable and is a weak index of growth. Thallus area was a reliable measure of growth (power correlation, R2 = 0.89). Rapid, highly irregular growth occurred in small thalli «30 mm2 ), and steady, uniform growth occurred in larger thalli (>30 mm2 ). This new methodology is tedious but can potentially generate accurate and precise measures for even the tiniest of lichens. en_US
dc.subject Lichens -- Monitoring en_US
dc.subject Lichens -- Ecophysiology en_US
dc.subject Photography -- Digital techniques en_US
dc.title Measurement of growth in the lichen Rhizocarpon geographicum using a new photographic technique en_US
dc.degree.name M.Sc. Biological Sciences en_US
dc.degree.level Masters en_US
dc.contributor.department Department of Biological Sciences en_US
dc.degree.discipline Faculty of Mathematics and Science en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search The Repository


Browse

My Account

Statistics


About the Digital Repository