Title page for ETD etd-04142009-102814

Type of Document Dissertation
Author Villamagna, Amy Marie
Author's Email Address amv@vt.edu
URN etd-04142009-102814
Title Ecological effects of water hyacinth (Eichhornia crassipes) on Lake Chapala, Mexico
Degree PhD
Department Fisheries and Wildlife Sciences
Advisory Committee
Advisor Name Title
Murphy, Brian R. Committee Co-Chair
Trauger, David L. Committee Co-Chair
Karpanty, Sarah M. Committee Member
Webster, Jackson R. Committee Member
  • water hyacinth
  • Eichhornia crassipes
  • waterbirds
  • community ecology
  • aquatic invertebrates
  • freshwater ecology
  • invasive species
Date of Defense 2009-04-01
Availability unrestricted
Water hyacinth (Eichhornia crassipes) is a floating non-native plant that has been reoccurring in Lake Chapala, Jalisco, Mexico for more than 100 years. In this research, I explore the effects of water hyacinth on freshwater ecosystems worldwide and specifically on Lake Chapala.

In chapter 1, I reviewed studies conducted on water hyacinth worldwide and found that the effects of water hyacinth on water quality are similar but the magnitude of effects is dependent on the percent cover and potentially the spatial configuration of water hyacinth mats. Water hyacinth’s effect on aquatic invertebrates, fish, and waterbirds is less predictable and dependent on conditions prior to invasion. In chapter 2, I tested for relationships between percent water hyacinth cover and waterbird abundance, species diversity, community composition, and habitat use. In general, I found a weak positive relationship or no relationship between these variables. In Chapter 3, I monitored habitat use by American Coots (Fulica americana) in a variety of habitats around Lake Chapala. I found that the time spent in water hyacinth positively corresponded to the percent water hyacinth cover and that the time foraging in water hyacinth was positively related to the time spent in water hyacinth.

In Chapter 4, I compared invertebrate assemblages in open water to those within and at the edge of water hyacinth mats, emergent vegetation, and submerged trees. I also examined invertebrate assemblages within the roots of water hyacinth plants and compared assemblages between patch and shoreline water hyacinth plants. I found that density and taxonomic richness of water column invertebrates were generally higher in association with water hyacinth, but that mean percent cover of water hyacinth affected the magnitude of differences among habitats and vegetation types. I did not find significant differences in root invertebrate density and taxonomic richness between patch and shoreline water hyacinth plants. In chapter 5, I discuss how water hyacinth affected dissolved oxygen and water transparency on a small, localized scale, but was not the driving factor for seasonal differences. The overall results suggest that water hyacinth had a minimal ecological effect on Lake Chapala during this study.

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