Spatial and Temporal Variability of Benthic Infaunal Communities in the Soft-substrates of the Elkhorn Slough, Moss Landing, California PDF Download
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Author: Katherine Hotchkiss Fenn
Publisher:
ISBN:
Category : Benthic animals
Languages : en
Pages : 146
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Book Description
Author: Katherine Hotchkiss Fenn
Publisher:
ISBN:
Category : Benthic animals
Languages : en
Pages : 146
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Book Description
Author: Jane M Caffrey
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 304
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Author: Dale R. Hopkins
Publisher:
ISBN:
Category : Benthos
Languages : en
Pages : 116
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Author: John Steven Oliver
Publisher:
ISBN:
Category : Aquatic animals
Languages : en
Pages : 198
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Author: Natalie Stauffer-Olsen Janelle
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ISBN:
Category :
Languages : en
Pages : 142
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An understanding of the spatial and temporal diversity of benthic invertebrates is necessary to understand, manage, and protect freshwater habitats. Benthic invertebrates are important components of aquatic ecosystems and are frequently used in bioassessment and biomonitoring programs. Benthic invertebrates can also play a role in nutrient cycling in lentic environments through bioturbation activities. This dissertation uses a range of techniques and analyses to understand the arrangement of benthic invertebrate diversity in Upper Klamath Lake, Oregon, and several watersheds in northern southern California. Upper Klamath Lake (UKL) is a large, shallow, naturally eutrophic lake that has experienced declines in water quality, which has led to annual cyanobacterial blooms of Aphanizomenon flos-aquae. Benthic invertebrates can increase autochthonous nutrient cycling through benthic bioturbation activities. In order to better understand the role that benthic invertebrates play in UKL, I studied the density, taxonomic richness, and species composition of benthic invertebrate assemblages in three geographic regions (north, central, and south) and three habitats (littoral, open-water and trench) across UKL. I also characterized sediment composition and water quality at each collection site and determined which environmental variables correlated with differences in benthic invertebrate composition. This research is located in Chapters 1 and 3 of this dissertation. Like benthic invertebrates in UKL, the mayfly Baetis tricaudatus is an abundant and ecologically important organism of freshwater ecosystems. Despite its widespread distribution, B. tricaudatus cannot be consistently and accurately identified and belongs to a species group known to have cryptic species diversity. While previous studies have examined the spatial distribution of this diversity, none have studied the temporal distribution. To better understand the temporal arrangement of diversity at the cytochrome oxidase subunit 1 (CO1) mitochondrial gene region, I collected B. tricaudatus specimens from 3 sites over 4 years and used haplotype networks to visualize diversity. Because my results were different than those from other studies on the same taxon, for my final chapter I analyzed Baetis rhodani group COI sequences from northern and southern California using Bayesian phylogenetic analyses and haplotype networks. This research contributes to our understanding of genetic diversity, which is an important component to biodiversity.
Author: 梁士倫
Publisher:
ISBN: 9781374784635
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Biotic communities
Languages : en
Pages : 302
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Author: Katherine E. Huotari
Publisher:
ISBN:
Category : Benthos
Languages : en
Pages : 57
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Changes in particle size of sediment as a result of erosion can have potential impacts on benthic community structure. To examine the potential impacts, a 2x2 factorial design was used to evaluate the effects of particle size and particle heterogeneity on the intertidal community structure of Elkhorn Slough using data provided by Moss Landing Marine Laboratories. In this study, changes in functional guild roles with respect to particle size and particle heterogeneity were examined, rather than traditional biological measures, because functional guild roles are more directly related to physical changes in the environment. The results showed that particle size and particle heterogeneity affected functional roles. Increases in particle size showed a corresponding decrease in number of surface-dwelling species and of surface and subsurface individuals. In addition, increases were observed in the number of domicile guilds, tube-dwelling species, suspension species, deposit-feeding species, and deposit-feeding individuals. Decreases in particle heterogeneity corresponded with a decrease in the number of feeding guilds. This research indicates that the benthic community in Elkhorn Slough may change radically over time, particularly in response to changes in particle size.
Author:
Publisher:
ISBN:
Category : Biotic communities
Languages : en
Pages : 46
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Author: John S. Oliver
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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This report deals with the patterns of benthic succession in soft-bottom marine communities. The primary study objective was to elucidate and evaluate the mechanisms that control these patterns. Benthic succession is the pattern of community recovery following a perturbation. Controlled perturbations of bottom communities were effected by the dredging of locations in Moss Landing Harbor and by the disposal of dredged material in Monterey Bay, Calif. The general pattern of succession was highly dependent upon the nature of the physical environment and the structure of surrounding communities. The open coast communities of Monterey Bay are numerically dominated by small crustaceans and polychaetes. Succession was divided into an early and a late phase. The early phase was characterized by the immigration of peracarid crustaceans and the settlement of the larvae of relatively opportunistic species of polychaetes. The latter have relatively short generation times, small size, low fecundity and high larval availability (frequency and abundance of larve in the water). These opportunistic are uncommon in the natural, undisturbed bottom community. The later phase of succession was characterized by the gradual reestablishment of the less mobile crustaceans and less opportunistic polychaetes that inhabited the areas prior to the experimental distrubances. It was concluded that the management of benthic marine resources and dredging operations should involve an analysis of the natural distrubance regime at a potential dredging or disposal site and its relation to the associated bottom communities.
