Table 2: Evaporation from individual shoots of antarctic mosses ...

• Main Authors: Noakes, T D, Longton, R E
• Format: Dataset
• Language: English
• Published: PANGAEA 1988
• Subjects: Parameter; Unit; Specification; Andreaea gainii; Drepanocladus unicinatus; Schistidium antarctici; Polytrichum alpinum; Bartrania patens; Tide gauge station; SeaLevel; Antarc*; Antarctic; Signy Island; South Orkney Islands
• Online Access: https://dx.doi.org/10.1594/pangaea.762899; https://doi.pangaea.de/10.1594/PANGAEA.762899

Experimental observations on pathways of water movement are discussed in relation to anatomical and micromorphological features of five moss species from Signy Island, South Orkney Islands. Significant internal uptake of water was recorded only in the mesic species Polytrichum alpinum (internal=>60% of total) and Bartramia patens (internal=c.30% of total), in experiments in which uptake by cut shoots was compared in individuals with the external pathway blocked, and others with both external and internal pathways open. Internal uptake maintained shoot water content close to full turgor in P. alpinun and at 30% of full tugor in B. patens, whereas water content fell to 12-15% dry wt. in the lithophytes Andreaea gainii and Schistidium antarctici and in the mesic/hydric species Drepanocladus uncinatus, with the external pathway blocked. Where both pathways were open water uptake from below maintained water content at or above full turgor in shoots of all five species. External water uptake by capillarity ... : Evaporation during 24 h at 10°C and 80% RH (VPD=245 Pa). Figures in brackets are sample standard deviations. Percentages show internal movement as a proportion of total. ...