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Influence of native macrophytes and ...

Ott, Richard A., Jr.

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Influence of native macrophytes and herbivory on establishment and growth of Hydrilla verticillata in pond-scale mesocosms.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Influence of native macrophytes and herbivory on establishment and growth of Hydrilla verticillata in pond-scale mesocosms./
Author:	Ott, Richard A., Jr.
Description:	138 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2925.
Contained By:	Dissertation Abstracts International66-06B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3179100
ISBN:	9780542189395

Influence of native macrophytes and herbivory on establishment and growth of Hydrilla verticillata in pond-scale mesocosms.
Ott, Richard A., Jr.

Influence of native macrophytes and herbivory on establishment and growth of Hydrilla verticillata in pond-scale mesocosms. - 138 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2925.

Thesis (Ph.D.)--Stephen F. Austin State University, 2005.

This study assessed the ability of three native macrophyte species to resist invasion, expansion, and biomass accumulation of exotic Hydrilla ( Hydrilla verticillata). Experiments were carried in four 0.25 ha (hectare) research ponds over three years on the LAERF (Lewisville Aquatic Ecosystem Research Facility) facility in Lewisville, TX. Native species were planted in protective exclosures and given 13 months of preemption prior to introduction of hydrilla. During the growing season, plant growth was recorded by cover class. At the end of the experiment biomass samples were collected and the pond-scale macrophyte community was mapped. Sediment nitrogen samples were collected by treatment twice a year and water quality parameters were collected on approximately 2-week intervals during the second and third years. Comparison of treatments was based on cover class through time and biomass accumulation at the end of the experiment. In one pond out of four, water star-grass (Heteranthera dubia), and wild celery ( Vallisneria americana), significantly resisted radial expansion of hydrilla compared to controls, but no difference was detected in biomass accumulation between hydrilla in treatments or controls. Hydrilla did not appear to limit expansion or biomass accumulation of treatment species compared to controls. No consistent change in sediment nitrogen was detected and sediment nitrogen concentration appeared to be influenced more by the actions of aquatic animals than aquatic plants. Differences in environmental conditions between ponds and unexpected invasion by red swamp crayfish (Procambarus clarkii ) confounded results. Wild celery appeared to be more resistant than other species tested to adverse environmental conditions including herbivory by crayfish and grass carp (Ctenopharyngodon idella), and rooting by common carp (Cyprinus carpio) and may be a better candidate for restoration than was previously recognized.

ISBN: 9780542189395Subjects--Topical Terms:

1017726
Biology, Ecology.

Influence of native macrophytes and herbivory on establishment and growth of Hydrilla verticillata in pond-scale mesocosms.
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