Brief description
The study aims to determine the seasonal photosynthetic variation in Posidonia sinuosa, Posidonia australis and Halophila ovalis. Sampling was conducted in in-situ seagrasses over eight months, from spring 2004 to autumn 2004 at Woodman Point, Western Australia.Lineage
Maintenance and Update Frequency: notPlanned
Statement: - Chlorophyll fluorescence measurements -
Measurements were made on seven occasions from 10 October 2003 to 27 May 2004, between 0730 and 1130 h. Measurements were not carried out in winter due to frequency of storms. Chlorophyll fluorescence measurements were carried out as described in section 2.2.2.1 of the thesis.
Rapid light curvers (RLCs) were measured at the base of rank two (second youngest) Posidonia leaves (40 - 60 mm from the leaf sheath) and at the centre of the blade of Halophila leaves. None of the leaves carried visible epiphytic growth. Leaves were shaded from ambient light during the measurement of RLCs. Ambient irradiances were recorded from within the canopy at the location where RLC measurements were made. Absorptance factors used in this study were 0.64 for P. sinuosa, 0.59 for P. australis and 0.55 for H. ovalis, as calculated in section 2.2.1. of thesis. The number of replicates for each measurement varied between 5 and 24.
Measurements were made on seven occasions from 10 October 2003 to 27 May 2004, between 0730 and 1130 h. Measurements were not carried out in winter due to frequency of storms. Chlorophyll fluorescence measurements were carried out as described in section 2.2.2.1 of the thesis.
Rapid light curvers (RLCs) were measured at the base of rank two (second youngest) Posidonia leaves (40 - 60 mm from the leaf sheath) and at the centre of the blade of Halophila leaves. None of the leaves carried visible epiphytic growth. Leaves were shaded from ambient light during the measurement of RLCs. Ambient irradiances were recorded from within the canopy at the location where RLC measurements were made. Absorptance factors used in this study were 0.64 for P. sinuosa, 0.59 for P. australis and 0.55 for H. ovalis, as calculated in section 2.2.1. of thesis. The number of replicates for each measurement varied between 5 and 24.
Created: 10 08 2007
Data time period: 2003-10-10 to 2004-05-27
text: westlimit=115.65; southlimit=-32.29; eastlimit=115.78; northlimit=-32.12
text: uplimit=2; downlimit=1
Subjects
63 605002 |
63 617002 |
63 617003 |
BIOSPHERE |
EARTH SCIENCE |
ECOLOGICAL DYNAMICS |
ECOSYSTEM FUNCTIONS |
Halophila ovalis |
Oceans | Marine Biology | Marine Plants |
Photosynthesis |
Posidonia australis |
Posidonia sinuosa |
Seagrass |
chlorophyll fluorescence |
oceans |
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Other Information
global : be3a7d90-46ed-11dc-9f4a-00188b4c0af8
Identifiers
- global : cfb4d560-4a31-11dc-85e1-00188b4c0af8
