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    Fragment reattachment, reproductive status, and health indicators of the invasive colonial tunicate Didemnum vexillum with implications for dispersal

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    divex frag manuscript_working draft_revised after comments.pdf (732.0Kb)
    Date
    2012-04
    Author
    Morris, James A.  Concept link
    Carman, Mary R.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5183
    As published
    https://doi.org/10.1007/s10530-012-0219-8
    Keyword
     Didemnum vexillum; Invasive species; Tunicate 
    Abstract
    The invasive colonial tunicate Didemnum vexillum is now widespread in coastal and offshore waters of New England, USA. D. vexillum can inflict ecological and economic damage through biofouling and habitat modification. Natural and anthropogenic processes that fragment colonies of D. vexillum may be accelerating the spread of this invader. Reattachment success and fragment viability were confirmed in the laboratory after four weeks of suspension in experimental aquaria. The shape of suspended D. vexillum fragments progressed from flattened to globular spheres and then flattened again after reattachment to the substrate. Reproductive activity, confirmed by the presence of eggs and larvae, was observed for fragments suspended up to three weeks suggesting that D. vexillum is capable of reproducing while in a fragmented, suspended state. An index of colony health was used to monitor change in D. vexillum health while in suspension. Overall, colony health declined with time in suspension although colonies that appeared dead (black and gray in overall color) still contained a substantial number of healthy live zooids. These results suggest that activities that cause fragmentation can significantly facilitate the spread of D. vexillum. Coastal managers should consider reducing or eliminating, when practical, activities that return fragmented colonies of D. vexillum to the water. In-water cleaning of biofouling and dredging are likely expediting the spread of this invasive species unless biofouling can be contained and removed from the water.
    Description
    This manuscript is not subject to U.S. copyright. The definitive version was published in Biological Invasions 14 (2012): 2133-2140, doi:10.1007/s10530-012-0219-8.
    Collections
    • Biology
    Suggested Citation
    Preprint: Morris, James A., Carman, Mary R., "Fragment reattachment, reproductive status, and health indicators of the invasive colonial tunicate Didemnum vexillum with implications for dispersal", 2012-04, https://doi.org/10.1007/s10530-012-0219-8, https://hdl.handle.net/1912/5183
     

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