Spatial and Temporal Assessment of Fish Habitat and Environmental-nearshore Fish Community Relationships in the Eastern Lake Erie Basin [microform] PDF Download
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Author: Sapna Sharma
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612915800
Category :
Languages : en
Pages : 364
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Book Description
Environmental conditions were used to determine relationships with the nearshore fish assemblage of the eastern basin and to model habitat for different life stages of walleye in the eastern Lake Erie basin adjacent to the outflow of the Grand River. Optimal walleye habitat tended to be found along the shoreline of the lake and dependent on the Grand River plume. Generally, there was very little optimal walleye habitat found in the lower reaches of the Grand River. The nearshore fish assemblage tended to be size-structured and related to specific environmental conditions, such as conductivity, temperature, dissolved organic carbon, chloride concentrations, alkalinity, sampling date and abundances of emergent and submergent plants. Improvements in both biotic and abiotic features of habitat in the nearshore and tributaries will enhance the amount of habitat optimal for specific fish species, and thereby the potential abundance of these fish species.
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Author: Sapna Sharma
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612915800
Category :
Languages : en
Pages : 364
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Book Description
Environmental conditions were used to determine relationships with the nearshore fish assemblage of the eastern basin and to model habitat for different life stages of walleye in the eastern Lake Erie basin adjacent to the outflow of the Grand River. Optimal walleye habitat tended to be found along the shoreline of the lake and dependent on the Grand River plume. Generally, there was very little optimal walleye habitat found in the lower reaches of the Grand River. The nearshore fish assemblage tended to be size-structured and related to specific environmental conditions, such as conductivity, temperature, dissolved organic carbon, chloride concentrations, alkalinity, sampling date and abundances of emergent and submergent plants. Improvements in both biotic and abiotic features of habitat in the nearshore and tributaries will enhance the amount of habitat optimal for specific fish species, and thereby the potential abundance of these fish species.
Author: Martin Albert Simonson
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 36
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Book Description
Approximately 80% of fishes from the Laurentian Great Lakes use the nearshore zone in some way (e.g., feeding, spawning, or nursery area) for at least part of the year. Extensive shoreline alteration and development along Ohio's Lake Erie coast has reduced habitat complexity and changed ecological connections at the interface of land, water, and air. We hypothesized that shoreline features affect the nearshore fish community composition. To determine relationships between shoreline types and the nearshore fish community, habitat features such as terrestrial vegetation, shoreline armor structure and a shoreline's exposure to wave energy were classified at 51 coastal sites in the western and central basins of Lake Erie where fish were sampled between 2011 and 2016. Changes in the predicted total and relative abundances of nearshore fish community groups was modeled based on shoreline classifications. We found that wave energy was negatively correlated with fish species richness as well as total abundance of nearly all fish groups. Understanding the impacts of shoreline modification on nearshore fish community attributes is critical to employing best management practices and maintaining critical fish habitats.
Author: C. R. Dolan
Publisher:
ISBN:
Category : Fishery resources
Languages : en
Pages : 206
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Book Description
Author: P. A. Ryan
Publisher:
ISBN:
Category : Fish communities
Languages : en
Pages : 68
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Book Description
Author: Gene S. Helfman
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 560
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Book Description
Author: Anna Kathleen Ormiston
Publisher:
ISBN:
Category : Cyanobacteria
Languages : en
Pages : 103
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Book Description
Through close interactions with biotic and abiotic environments, microbial communities in lakes mediate numerous biogeochemical processes that are essential in regional and global cycles of C, N and P. However, the relationship between bacterial community compositions and environmental conditions is still unclear. Lake Erie's natural gradient of nutrient supply and many other environmental parameters from the Sandusky Bay to the Central Basin provides an ideal experiment to examine how well bacterial community composition tracks environmental changes spatially and temporally. Surface water samples were collected along a transect that ran from the Sandusky Bay (hypereutrophic) via Sandusky Sub-basin (mesoeutrophic) to the Central Basin (oligotrophic) in June, July and August 2012. Zooplankton sample were also collected at each basin in June, July and August to see whether they respond to environmental conditions and to the changing bacterioplankton communities. Physico-chemical parameters were measured in situ. Bacterioplankton was collected on filters and filtrates were used for nutrient analyses, including ammonium, dissolved organic carbon, total dissolved nitrogen, nitrate, nitrite and soluble reactive phosphorus. Chlorophyll a concentration measurements confirmed the expected gradient of primary productivity among sites. Terminal restriction fragment length polymorphism (T-RFLP) analysis was conducted to compare of the microbial community structure and diversity along this natural gradient from the Sandusky Bay to the Central Basin. Additionally, zooplankton community structure and diversity was compared along the transect. Results showed that the free-living bacterioplankton structure differed significantly among sampling time, which was likely contributed by temporal variations in nutrient concentrations. As for the zooplankton community, Cyclopidae, Branchionidae and Synchaetidae were identified as major families (>78.4% of total zooplankton) in all samples. Zooplankton family structure had no clear separation based on site location on site location or sampling time. In addition, no significant correlation was identified between zooplankton community structure and environmental parameters or with zooplankton community structure and bacterioplankton community structure. Zooplankton diversity tests revealed significant differences in zooplankton diversity among sites and months. This research contributes a better understanding of the zooplankton and bacteria community structure found in Lake Erie. Along with this natural nutrient gradient found in Lake Erie, harmful cyanobacterial blooms (cyanoHABS) is also a serious issue that affects wildlife, human health, recreation and local economics. CyanoHABs produce cyanotoxins, such as microcystins that lead to skin irritation, illness and liver tumors. Natural bacterial degradation of these microcystins play a key role in lakes by transforming these harmful toxins to less harmful metabolites that can be consumed by other organisms without a detrimental affect on their health and ecosystem health. Microcystin-LR is a toxin produced in harmful cyanobacteria blooms in Lake Erie and in Grand Lake St. Marys. This experiment specifically compared bacterial community structure and diversity from lakes with previous CyanoHAB exposure and their response to amended Microcystin-LR levels. Water samples were collected in June 2012 in the western basin, Sandusky sub-basin and central basin of Lake Erie and three recreational sites in Grand Lake St. Mary’s. Particulate-associated bacterioplankton was filtered out of the water samples, and the remaining filtrate was starved of all carbon and incubated in the dark for 1 week. After incubation, water samples were divided into triplicate microcosms. Microcystin-LR additions were added to the water samples as the sole carbon source for the naturally existing bacterioplankton community. After the microcystin-LR addition cell counts and microcystin concentrations were measure every 24 hours for two days. T-RFLP analysis was conducted to compare original bacterial community structure and diversity for each site to the Microcystin-LR amended bacterial community structure and diversity. Significant differences between start and end MC-LR concentrations (p 0.05) measured in the incubation experiment indicated MC-LR degradation. Shannon diversity indices for bacterioplankton T-RF percent abundances were not significantly different between treatments for both lakes (ANOVA, p 0.05). T-RFLP results showed that bacterioplankton community structures were significantly different between microcystin amended and original free-living bacterioplankton communities for Grand Lake St. Mary samples, but there was no significant difference between community structure for MC-amended treatments and non amended controls. In contrast, Lake Erie’s MC-amended communities experienced no shift in community structure. Non-amended controls had natural occurring MC-concentration, which suggests that there is a large subset of bacterioplankton that could degrade MC-LR before the treatments were administered. The extensive CyanoHAB history found in both lakes can explain these results. There are two dominating cyanobacterial species in Grand Lake St. Mary’s and four in Lake Erie, which suggests that these differences may affect the differences in MC degraders found in both lakes and the overall bacterioplankton community structure. Evidence of MC-degradation could be explained by bacterioplankton using MC-LR as an energy source.
Author: M. Munawar
Publisher:
ISBN:
Category : Biotic communities
Languages : en
Pages : 576
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Book Description
Author: Ryan Michael Laurich
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages :
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Book Description
Author: University of Washington. Fisheries Research Institute
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 220
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Book Description
Author: Great Lakes Laboratory for Fisheries and Aquatic Sciences
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This report presents a prototype methodology for use in the Great Lakes for pre- and post-development assessment of inshore fish habitat, focusing on shoreline development projects that involve construction of headlands or offshore structures such as islands. The purpose of the methodology is to provide a quantitative, defensible assessment protocol which project proponents and fish managers can use to assess compliance of projects with the federal policy of no net loss of fish habitat in development. The protocol combines published habitat requirements of three thermal guilds of Great Lakes fishes with areal estimation of lost or modified inshore habitat. The method also attempts to estimate adjacent habitat indirectly affected by the structures. A case study of a marina in Hamilton Harbour illustrates use of the protocol in assessing such matters as the effect of the development on fish habitat suitability and fish productivity.
