Appearance matters: sedimentation effects on different sponge morphologies
| Autor: | Nicole S. Webster, M. Carmen Pineda, Alan Duckworth |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
0301 basic medicine 010604 marine biology & hydrobiology Sediment Aquatic Science Sedimentation Biology biology.organism_classification 01 natural sciences law.invention Dredging 03 medical and health sciences Sponge 030104 developmental biology Microbial population biology Callyspongia law Environmental chemistry Botany Filtration Total suspended solids |
| Zdroj: | Journal of the Marine Biological Association of the United Kingdom. 96:481-492 |
| ISSN: | 1469-7769 0025-3154 |
| Popis: | Dredging activity poses an environmental risk to sponges as sediments from the dredge or disposal site may smother the sponge surface, potentially affecting water filtration and light penetration. Dredge-related sedimentation effects may also vary between sponge morphologies, potentially impacting community structure and functioning. To test this, 10 sponge species encompassing four different morphologies (massive, erect, cup and encrusting), were exposed to a single pulse treatment of three different sediment concentrations (0, 250 and 500 mg l−1) and followed over 2 weeks, in 1000 l tanks. Total suspended solids (TSS) and sedimentation rates (SR) were recorded throughout the study. A sharp decrease in TSS was recorded within the first 2–3 h and a total settlement of sediments occurred within the first 48 h of the pulse exposure (0, 8 and 16 mg cm−2in the control, medium and high sediment treatments, respectively). The effects of high sedimentation included mortality of cup-shapedCallyspongia confoederataand small areas of tissue necrosis in other species, with massive, encrusting and wide cup morphologies particularly affected. However, the sediment concentrations tested in this experiment did not cause changes in the concentration of sponge pigments or the structure of the symbiotic microbial community in any species. These results indicate that a single pulse of sediments less than 16 mg cm−2is not detrimental to most of the sponge species studied. |
| Databáze: | OpenAIRE |
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