c. How are gradients incorporated in to sampling?
The distribution of seagrasses is largely influenced by environmental gradients in depth , light availability, water clarity, temperature, current speed, salinity, etc. Given that seagrasses are often found in estuaries and shallow coastal areas where gradients are steep, studies should include the variability in seagrasses associated with major gradients through sample design or by collecting ancillary environmental information. For example, if production in a seagrass community a being assessed and production varies with depth, sample collection could include a similar number of replicates at each of three depths (Chapter 7), referred to as stratified sampling. In this case, sampling is stratified by depth. Alternatively, the depth relative to mean water level could be measured at each sample location, providing a regression variable (covariable). Similar adjustment can be made to sampling designs to account for temporal (e.g., seasonal) variation.
c. How are gradients incorporated in to sampling? The distribution of seagrasses is largely influenced by environmental gradients in depth , light availability, water clarity, temperature, current speed, salinity, etc. Given that seagrasses are often found in estuaries and shallow coastal areas where gradients are steep, studies should include the variability in seagrasses associated with major gradients through sample design or by collecting ancillary environmental information. For example, if production in a seagrass community a being assessed and production varies with depth, sample collection could include a similar number of replicates at each of three depths (Chapter 7), referred to as stratified sampling. In this case, sampling is stratified by depth. Alternatively, the depth relative to mean water level could be measured at each sample location, providing a regression variable (covariable). Similar adjustment can be made to sampling designs to account for temporal (e.g., seasonal) variation.
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