Epidermal shedding in Ascophyllum nodosum (Phaeophyceae): seasonality, productivity and relationship to harvesting
| Autor: | Laryssa Halat, Moira E. Galway, Sara Gitto, David J. Garbary |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phycologia. 54:599-608 |
| ISSN: | 2330-2968 0031-8884 |
| DOI: | 10.2216/15-32.1 |
| Popis: | Epidermal shedding, a process that effectively controls epiphyte accumulation on certain long-lived macroalgae, was quantified weekly for over 1 year in a population of Ascophyllum nodosum from Nova Scotia. About 25% of the frond epidermis is shed per week and for at least 9 months of the year, this shedding occurred in population-level cycles of skin shedding followed by reaccumulation of epiphytes. Using a geometric model based on cross-sectional area of branches assigned to one of four size categories, we determined that about 1% of frond biomass is shed during each monthly cycle. Taking into account the differences in frond architecture at 10 sites from around Nova Scotia, an estimated 10% of vegetative frond biomass enters coastal waters each year solely as a result of epidermal shedding. This natural contribution to coastal detritus amounts to about 2 t ha−1 of Ascophyllum beds in Lobster Bay, the primary harvest region for Ascophyllum in Nova Scotia. This is a significant and previously u... |
| Databáze: | OpenAIRE |
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