Spatial and Temporal Variability in Post-larval Yellow Perch Density PDF Download
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Author: Steve Hauschildt
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 116
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Book Description
"Yellow Perch Perca flavescens are important as forage for other species and for sport fishing in many northern lakes. However, estimating post-larval Yellow Perch populations can be difficult because of many environmental factors that cause unexplained variation. The objective of this study was to help reduce unexplained variation by determining a post-larval Yellow Perch population density estimate on Blackduck Lake, MN, provide guidance to help dete1mine the number of trawls required for trawling-based recruitment indices to achieve varying levels of precision, and test for the effects of wind speed and direction on post-larval Yellow Perch spatial variability. This study estimated a density of 0.45 fish/m3 (0.58 SD) during the sampling period (26 Jun - 07 Jul 2017). It was determined that between 10-15 trawls produced a precise density estimate; however, trawls should be taken over multiple days in varying wind speeds to avoid over/under estimation. Trawling should also be performed in-line with wind direction to ensure non-bias estimates are calculated from both upwind and downwind sectors. This study determined wind speed and direction had a significant influence on the distribution of post-larval Yellow Perch, as more fish were caught in the downwind sector until winds reached 15 kmph. At 15 kmph, fish densities were equal in the upwind and downwind sectors of the lake. Wind did not have a significant influence though on how post-larval Yellow Perch were distributed by total length. During high wind events, more fish were found in the upwind sector of the lake, suggesting that post¬larval fish are being moved laterally out of non-towable areas. From the results of this study it appears Yellow Perch must continually relocate back into shallow areas after each high wind event moves them out of the non-towable areas, until they are strong enough to resist the wind."-Abstract.
Author: Steve Hauschildt
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 116
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Book Description
"Yellow Perch Perca flavescens are important as forage for other species and for sport fishing in many northern lakes. However, estimating post-larval Yellow Perch populations can be difficult because of many environmental factors that cause unexplained variation. The objective of this study was to help reduce unexplained variation by determining a post-larval Yellow Perch population density estimate on Blackduck Lake, MN, provide guidance to help dete1mine the number of trawls required for trawling-based recruitment indices to achieve varying levels of precision, and test for the effects of wind speed and direction on post-larval Yellow Perch spatial variability. This study estimated a density of 0.45 fish/m3 (0.58 SD) during the sampling period (26 Jun - 07 Jul 2017). It was determined that between 10-15 trawls produced a precise density estimate; however, trawls should be taken over multiple days in varying wind speeds to avoid over/under estimation. Trawling should also be performed in-line with wind direction to ensure non-bias estimates are calculated from both upwind and downwind sectors. This study determined wind speed and direction had a significant influence on the distribution of post-larval Yellow Perch, as more fish were caught in the downwind sector until winds reached 15 kmph. At 15 kmph, fish densities were equal in the upwind and downwind sectors of the lake. Wind did not have a significant influence though on how post-larval Yellow Perch were distributed by total length. During high wind events, more fish were found in the upwind sector of the lake, suggesting that post¬larval fish are being moved laterally out of non-towable areas. From the results of this study it appears Yellow Perch must continually relocate back into shallow areas after each high wind event moves them out of the non-towable areas, until they are strong enough to resist the wind."-Abstract.
Author: Travis Taylor
Publisher:
ISBN:
Category : Lake ecology
Languages : en
Pages : 0
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Author: Ryder Jace Rutko
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Knowledge of fish population structure allows fisheries managers to account for potentially different responses of discrete groups to external stressors. Life history traits are very useful indicators of population structure because they provide information about fish populations that incorporates elements of genetics, environment, and resource use simultaneously. In Lake Huron, the yellow perch (Perca flavescens) is managed based on 17 geographic management units; however, it is unknown if management units accurately represent discrete perch groups. Furthermore, it is unclear whether yellow perch population structure changed temporally over the course of the major ecosystem shift in the early 2000s, where invasive mussels decreased zooplankton and benthic invertebrate abundance, altered nutrient and energy distribution, and reduced lake productivity. Here, I used data from the Ontario Ministry of Natural Resources and Forestry's Lake Huron Index Netting Program to derive sex-specific life history traits for yellow perch including size at maturity, age at maturity, maximum size, lifespan, and growth at age 2 from contemporary (2009-2018) and historical (1990-1999) timeframes. In the first part of my study, I examined how yellow perch were spatially structured in Lake Huron. Generalized linear mixed models showed that yellow perch life history traits varied with location and depth, but primarily with latitude. Male maximum size was 1.1-fold greater at southernmost sites (276.3 ± 4.6 mm) compared to northernmost sites (247.7 ± 3.2 mm), while female maximum size was 1.1-fold greater at southernmost sites (318.5 ± 1.3 mm) compared to northernmost sites (293.9 ± 8.1 mm). Longitudinal and depth-based variation existed in fewer life history traits. Female maximum size was 1.2-fold greater at westernmost sites (293.9 ± 8.1 mm) compared to easternmost sites (244.2 ± 12.4 mm). Male growth at age 2 was 1.2-fold greater at deeper sites (160.0 ± 11.4 mm) compared to shallower sites (131.1 ± 0.3 mm), while female growth at age 2 was 1.2-fold greater at deeper sites (166.1 ± 16.2 mm) compared to shallower sites (139.6 ± 4.0 mm). I found 6 discrete clusters of yellow perch in Lake Huron based on variation in life history trait values, encompassing fish in the (1) South Basin, which were superior in growth, maturity, and lifespan; (2) Main Basin, which grew fast, but died fast; (3) North Channel, which had average growth and maturity, and lived long; (4) northeast Georgian Bay, which were short lived, slow growers; (5) central Georgian Bay, which had slow growth and fast maturity, but died quickly; and (6) south Georgian Bay, which had average growth and maturity, but died quickly. In the second part of my study, I found that yellow perch life history trait values showed no significant temporal variation. The only life history trait that was different before and after the major ecosystem shift was male maximum size, which increased on average 5% from 232.9 ± 23.3 mm to 244.6 ± 30.6 mm. The influence of location and depth varied across timeframes depending on the life history trait analyzed, but did not follow any specific pattern. Clusters of perch identified based on combinations of life history traits were similar in the contemporary and historical datasets. Current management units appear to adequately represent yellow perch population structure in Lake Huron, which suggests that no major change to the spatial arrangement of these management units is necessary. The discovery of no change in life history values over time despite the major ecosystem shift is surprising, and suggests that recent population declines are not via major shifts in the parameters I assessed.
Author: Matthew P. Balge
Publisher:
ISBN:
Category : Alewife
Languages : en
Pages : 224
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Author: Patrice Couture
Publisher: CRC Press
ISBN: 1498730337
Category : Science
Languages : en
Pages : 316
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Book Description
The genus Perca includes only three species of fish, but they are ubiquitous and abundant in freshwater and brackish environments of the northern hemisphere, from North America to Europe and Asia. These species are important both ecologically and economically. In Biology of Perch, world-renowned specialists review and update the biology of these fi
Author: Timothy J. Sullivan (Jr.)
Publisher:
ISBN:
Category : Biogeography
Languages : en
Pages : 117
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Book Description
The genetic structure of a species encompasses the distribution of genetic diversity and composition among its component populations, providing important insight for conservation and management. This knowledge can be used to evaluate life history, gene flow, recruitment dynamics, and responses to exploitation and habitat changes. Discerning the changes or consistencies in population genetic patterns over time can provide important insights into the mechanisms that regulate genetic resiliency. Ultimately, analyses of spatial and temporal population genetic patterns may be used to conserve genetic diversity, unique variability, and adaptive potential. The yellow perch Perca flavescens (Percidae: Teleostei) provides an opportunity to investigate these patterns, as its population groups have experienced variable annual recruitment, high exploitation as a popular fishery in the Laurentian Great Lakes, and have not been evaluated previously for temporal consistency in genetic patterns. The objective of this thesis is to analyze the spatial and temporal genetic diversity and divergence of yellow perch spawning groups in order to better understand its life history responses and advance knowledge aiding its management. Population genetic patterns of yellow perch spawning groups are assessed across the Huron-Erie Corridor (HEC) and from locations in Lakes St. Clair, Erie, and Ontario using 15 nuclear DNA microsatellite loci. Results of this thesis research indicate that yellow perch spawning groups have appreciable genetic diversity and are distinguished from one another by considerable genetic differences. For example, the group spawning at the Belle Isle restoration site in the Detroit River has relatively high genetic diversity, with an appreciable number of alleles and private alleles. Yellow perch spawning at sites in Lakes St. Clair, Erie, and Ontario also show substantial genetic diversity whose levels are consistent over time. However, the genetic composition of yellow perch spawning at some given locations varied among different sampling years. Some age cohorts born in specific years who spawned together at Dunkirk NY (1980-2008) and Monroe MI (1997-2004), genetically varied across age groups. This pattern did not correspond to a pattern of isolation by time (i.e., there was not a consistent trend). The effective population size of yellow perch spawning at the Dunkirk, NY location is relatively modest and appears to have remained relatively consistent in size over the past 30 years. These spatial and temporal patterns likely are linked to life-history characters, such as kin-aggregation, natal site fidelity, and/or a sweepstakes model of reproduction. Genetic monitoring and development of long-time data sets like those assembled here are recommended to provide an important management assessment tool for monitoring and conserving fishery populations.
![Spatially-explicit Habitat Characterization, Suitability Analysis, Verification, and Modelling of the Yellow Perch Perca Flavescens (Mitchell 1814) Population in Long Point Bay, Lake Erie [microform] PDF](https://books.google.com/books/content/images/frontcover/qWVjXwAACAAJ?fife=w80-h100)
Author: Susan Elisabeth Doka
Publisher: Library and Archives Canada = Bibliothèque et Archives Canada
ISBN: 9780494045015
Category : Fish populations
Languages : en
Pages : 317
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Book Description
Different approaches were used to characterize, assess, test and model the fish-habitat interactions of yellow perch in Long Point Bay. Chapter 1 describes the methodologies for explicitly characterizing spatial and temporal habitat through mapping and modelling. Chapter 2 connects habitat and ontogenetic niche shifts in perch life history, with the aim of determining suitable habitat availability for the Long Point Bay perch population. Habitat suitability indices and models were used to map and identify the areas of suitable habitat, including thermal habitat. Chapter 3 compares a known distribution of yellow perch larvae with HSI predictions of habitat suitability as a validation exercise. Abundance and size distributions from the survey were compared to thermal and HSI predictions of suitable habitat to test for correspondence. The relationship between food availability and habitat characteristics, especially vegetation, were also tested. A model was developed in Chapter 4 that concentrated on the first year of life and the effect of consecutive constraints on early life stages with different habitat requirements. The purpose of the model was to compare the potential growth and survival of consecutive life stages in a spatially explicit manner when different habitat-based rules are imposed. The results highlight the importance of life history theory and knowledge of mechanisms used in habitat selection for determining limits to fish production.
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 804
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Author:
Publisher:
ISBN:
Category : Aquatic sciences
Languages : en
Pages : 738
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Author: R.C. Chambers
Publisher: Springer Science & Business Media
ISBN: 9400914393
Category : Science
Languages : en
Pages : 616
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Book Description
Many of the processes influencing recruitment to an adult fish population or entry into a fishery occur very early in life. The variations in life histories and behaviours of young fish and the selective processes operating on this variation ultimately determine the identities and abundance of survivors. This important volume brings together contributions from many of the world's leading researchers from the field of fish ecology. The book focuses on three major themes of pressing importance in the analysis of the role that the early life history of fishes plays in the number and quality of recruits: the selective processes at play in their early life history; the contributions of early life history to the understanding of recruitment.
