Effects of a severe freeze on the shoal grass, Halodule wrightii, were documented through analysis of temporal and spatial trends in below-ground biomass. The coincidence of the second lowest temperature (-10.6??C) in 107 years of record, 56 consecutive hours below freezing, high winds and extremely low water levels exposed the Laguna Madre, TX, to the most severe cold stress in over a century. H. wrightii tolerated this extreme freeze event. Annual pre- and post-freeze surveys indicated that below-ground biomass estimated from volume was Unaffected by the freeze event. Nor was there any post-freeze change in biomass among intertidal sites directly exposed to freezing air temperatures relative to subtidal sites which remained submerged during the freezing period.
|Title||Response of shoal grass, Halodule wrightii, to extreme winter conditions in the Lower Laguna Madre, Texas|
|Authors||D.W. Hicks, C.P. Onuf, J.W. Tunnell|
|Publication Subtype||Journal Article|
|Series Title||Aquatic Botany|
|Record Source||USGS Publications Warehouse|