EFFECTS OF PRE-EXISTING SUBMERSED MACROPHYTES ON THE INVASION SUCCESS OF HYDRILLA VERTICILLATA
| dc.contributor.advisor | Engelhardt, Katharina | en_US |
| dc.contributor.author | Chadwell, Todd Byron | en_US |
| dc.contributor.department | Marine-Estuarine-Environmental Sciences | en_US |
| dc.contributor.publisher | Digital Repository at the University of Maryland | en_US |
| dc.contributor.publisher | University of Maryland (College Park, Md.) | en_US |
| dc.date.accessioned | 2004-08-27T05:20:05Z | |
| dc.date.available | 2004-08-27T05:20:05Z | |
| dc.date.issued | 2004-07-06 | en_US |
| dc.description.abstract | I evaluated (1) the effects of a native submersed aquatic plant species, <i>Vallisneria americana<i>, on the colonization success of a non-native and highly invasive submersed aquatic species, <i>Hydrilla verticillata<i>, through field and greenhouse experiments; and (2) the effects of <i>H. verticillata<i> propagule density on its colonization success of patches dominated by the native species. Results of the field study, located in a tidal freshwater region of Chesapeake Bay, suggest that pre-existing vegetation did not have significant negative effects on <i>H. verticillata<i> colonization. However, pre-existing <i>H. verticillata<i> biomass and <i>H. verticillata<i> colonization success were strongly correlated. In contrast, results from the greenhouse study showed that <i>V. americana<i> had a strong inhibitory effect on <i>H. verticillata<i> colonization by fragments and increasing <i>H. verticillata<i> fragment density again increased colonization success. Reduced water column nutrient concentrations, resulting from <i>V. americana<i> growth, appeared to negatively affect successful rooting and subsequent colonization by <i>H. verticillata<i>. | en_US |
| dc.format.extent | 845638 bytes | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/1903/1722 | |
| dc.language.iso | en_US | |
| dc.subject.pqcontrolled | Biology, Ecology | en_US |
| dc.subject.pquncontrolled | colonization | en_US |
| dc.subject.pquncontrolled | invasive species | en_US |
| dc.subject.pquncontrolled | Hydrilla verticillata | en_US |
| dc.subject.pquncontrolled | priority effect | en_US |
| dc.subject.pquncontrolled | submersed macrophyte | en_US |
| dc.subject.pquncontrolled | Vallisneria americana | en_US |
| dc.title | EFFECTS OF PRE-EXISTING SUBMERSED MACROPHYTES ON THE INVASION SUCCESS OF HYDRILLA VERTICILLATA | en_US |
| dc.type | Thesis | en_US |
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