Winds and the Demic Structure of a Population of Yellow Perch (Perca flavescens)

1993 ◽  
Vol 50 (3) ◽  
pp. 496-501 ◽  
Author(s):  
S. K. Aalto ◽  
G. E. Newsome
Keyword(s):  
Environmental Effects ◽  
Yellow Perch ◽  
Census Data ◽  
Perca Flavescens ◽  
Embryonic Stage ◽  
Egg Mass ◽  
Instantaneous Rate ◽  
Study Lake ◽  
The Relationship

Variations in year-class strengths of populations of fish are often attributed to environmental effects such as wind or temperature. Previously, we have presented evidence showing that the yellow perch (Perca flavescens) in a lake are composed of demes or subpopulations that vary independently. Here, we explore the relationship between winds from different directions and the independent variations of the demes of yellow perch in the study lake. We present a model that includes an instantaneous rate of mortality due to winds during the embryonic stage of yellow perch. The variables used to explain the observed egg-mass counts and thus the variations in the size of the demes are lagged egg-mass counts and winds, each of which varies yearly. Using wind and egg-mass census data, we were able to find statistically significant models that explain much of the variation (52–61%) in the independently varying demes (four of six investigated) of yellow perch in our study lake. We also present data that show that water temperatures vary in different ways at different sites in the same year, and in different ways at the same site in different years.

Evidence of Demic Structure for a Population of Yellow Perch (Perca flavescens)

1989 ◽  
Vol 46 (2) ◽  
pp. 184-190 ◽  
Author(s):  
S. K. Aalto ◽  
G. E. (Buck) Newsome
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
Extended Period ◽  
Behavior Patterns ◽  
Egg Mass ◽  
Spawning Behavior ◽  
Study Lake ◽  
Additional Support ◽  
And Behavior ◽  
Number Of Authors

A number of authors suggest that yellow perch (Perca flavescens and P. fluviatilis) populations are composed of subpopulations which persist over various periods of time. If the period of time is sufficiently long, then subpopulations may be demes or stocks of perch. These observations are based on the results of tagging studies, comparative growth studies, and behavior patterns of yellow perch. In this paper, evidence is presented which provides additional support for demic structure of yellow perch populations. This evidence consists of yearly egg-mass counts over an extended period of time (1978–87) at a number of distinct sites in a study lake and trapping data by sex, age, and date during one spawning season (1984) at a number of distinct sites in the same lake. Several models concerning perch spawning behavior are introduced to provide a framework for analyzing the data. Analysis of the data not only provides support for demic models of perch population structure, but also provides an estimate of the separation of the demes (0.4–0.5 km).

scholarly journals Dynamics of One-Species Populations of Fishes in Ponds Subjected to Cropping and Additional Stocking

1970 ◽  
Vol 30 (1-8) ◽  
pp. 69-165
Author(s):  
Homer Buck ◽  
Charles F. Thoits
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
Single Species ◽  
Smallmouth Bass ◽  
Production Data ◽  
Fish Production ◽  
Pomoxis Annularis ◽  
Relationship Of ◽  
The Relationship ◽  
Related Population

This report is based on several years of intensive studies of the production and related population dynamics of six kinds of warmwater fishes maintained as single species in 1-acre ponds. Species involved included the largemouth bass, Micropteriis salmoides (Lacepede); smallmouth bass, M. dolomieiii Lacepede; bluegill, Lepomis macrochiriis Rafinesque; yellow perch, Perca flavescens (Mitchill); brown bullhead, Ictahiriis uebulosus (LeSueur); and the white crappie, Pomoxis annularis Rafinesque. Most production data published for these species have originated primarily from studies involving complex, multispecies populations. The principal aims of this investigation were to 1 ) increase our knowledge of the carrying capacities of ponds for warmwater fishes, 2) consider the relationship of carrying capacity to standing crop and to rate of production, and 3) measure the influence of controlled population increases and decreases on fish production.

Behavioral thermoregulation and locomotor activity of Perca flavescens

1979 ◽  
Vol 57 (11) ◽  
pp. 2239-2242 ◽  
Author(s):  
William Wallace Reynolds ◽  
Martha Elizabeth Casterlin
Keyword(s):  
Locomotor Activity ◽  
Yellow Perch ◽  
Local Minimum ◽  
Perca Flavescens ◽  
Behavioral Thermoregulation ◽  
Major Peak ◽  
Nocturnal Activity ◽  
Preferred Temperature ◽  
Preferred Temperatures ◽  
The Relationship

Ten yearling yellow perch (Perca flavescens) were tested individually for 3-day periods in electronic shuttleboxes to determine their diel patterns of behavioral thermoregulation and of locomotor activity relative to a natural April photoperiod, and to determine the relationship between preferred temperatures and activity. The perch exhibited a diel rhythm of preferred temperature, with a predawn minimum of 16.7 °C and a dusk maximum of 23.8 °C. The 24-h mean was 20.2 °C; the diurnal mean was 21.5 °C and the nocturnal mean was 18.5 °C. Locomotor activity (quantified as mean photocell-monitored light-beam interruptions per hour) was crepuscular, with a major peak (25 units/h) at dusk, and a smaller peak (14.4 units/h) at dawn. Nocturnal activity was slightly greater (5.3 units/h) than diurnal activity (4.4 units/h). Locomotor activity relative to temperature exhibited a local minimum (0.4–6.2 units/h) at 22.2 °C.

The relationship between piscivory and growth of white sucker (Catostomus commersoni) and yellow perch (Perca flavescens) in headwater lakes of the Canadian Shield

2005 ◽  
Vol 62 (12) ◽  
pp. 2706-2715 ◽  
Author(s):  
Andrea Bertolo ◽  
Pierre Magnan
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
Canadian Shield ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Piscivorous Fish ◽  
Headwater Lakes ◽  
Species Specific ◽  
First Year Of Life ◽  
The Relationship

We used data from a survey of 36 headwater lakes of the Canadian Shield to investigate the relationship between piscivory and growth, abundance, and longevity of white sucker (Catostomus commersoni) and yellow perch (Perca flavescens). The occurrence of northern pike (Esox lucius) and walleye (Sander vitreus) explained variations in the abundance of both white sucker and yellow perch, suggesting strong predation-induced mortality. The longevity of both species tended to be negatively related to increased piscivory. White sucker grew better and had a better condition in lakes with piscivores. Yellow perch showed only small among-lake differences in growth and condition. The superior competitive ability of white sucker over yellow perch could explain why yellow perch did not show improved growth or longevity where population densities were low in lakes with piscivores and white sucker. Furthermore, yellow perch growth was inversely related to the biomass of piscivorous fish in their first year of life. Stomach content data suggest that small yellow perch, which rely on zooplankton, might restrict their use of pelagic resources to reduce their predation risk by piscivores, thus reducing their growth. Our results show that the effects of piscivores can be species-specific and dependent on community structure.

An Egg-Mass Census Method for Tracking Fluctuations in Yellow Perch (Perca flavescens) Populations

1987 ◽  
Vol 44 (6) ◽  
pp. 1221-1232 ◽  
Author(s):  
G. E. (Buck) Newsome ◽  
S. K. Aalto
Keyword(s):  
Environmental Factors ◽  
Physical Environment ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Population Estimates ◽  
Egg Mass ◽  
Juvenile Survival ◽  
Confidence Limits ◽  
Statistical Procedures ◽  
Internal Seiches

Extreme annual fluctuations among yellow perch (Perca flavescens) populations are common and have been related to changes in the physical environment during early stages of the development of a year-class. However, critical investigations of these relationships are often hampered by the lack of accurate techniques for estimating abundance. In this paper an egg-mass census technique is described, and statistical procedures which provide population estimates with confidence limits are given. Also discussed are results of preliminary investigations of environmental factors which may have a dramatic affect on the year-class strengths of perch. Winds play an important role in determining recruitment rates. Wind-generated internal seiches may result in thermal shocking of perch embryos which subsequently affects juvenile survival.

Faktor-Faktor yang Berhubungan dengan Kinerja Penyuluh Pertanian di Kabupaten Ciamis Jawa Barat

2020 ◽  
Vol 4 (4) ◽  
pp. 545
Author(s):  
Nur Puti Kurniawati ◽  
Dwi Sadono ◽  
Endang Sri Wahyuni
Keyword(s):  
Achievement Motivation ◽  
Census Data ◽  
Work Motivation ◽  
Agricultural Extension ◽  
Field Extension ◽  
Need For Achievement ◽  
Extension Agent ◽  
Spearman Correlation Test ◽  
And Performance ◽  
The Relationship

Agricultural extension agent was the main spearhead in carrying out counseling. A good agricultural extension agent can be reflected in their performance. The purpose of this study were: (1) describe the characteristics of agricultural extension agent, (2) describe the level of competence, level of work motivation, and describe level of performance of agricultural extension agent, (3) analyze the relationship between characteristics of agricultural extention agent and the level of performance of agricultural extension agent, (4) analyze the relationship between the level of competency of agricultural extension agent and the level of performance of agricultural extension agent, (5) analyze the relationship between the level of motivation of agricultural extension agent and the level of performance of agricultural extension agent. Responden in this study were 48 field extension agent who are civil servant in Ciamis Regency West Java and selected by census. Data were analyzed using Rank Spearman correlation test. The results showed that agricultural extension agent in Ciamis Regency were dominated by extension agent who were old, undergraduate educated, had little training, and had a long working period. Agricultural extension agent in Ciamis Regency generally have sufficient competency which tends to be high and generally dominated by the need for achievement motivation. The results also show that there is a relationship between managerial competence and performance, social competence with performance, technical competence with performance, level of competency with performance, and the need for achievement with performance.Keywords: Agricultural Extension Agent,Competence, Motivation, Performance.

Oxidation of Olefins Representing Some Structural Units of GR-S

1952 ◽  
Vol 25 (1) ◽  
pp. 21-32 ◽  
Author(s):  
W. C. Warner ◽  
J. Reid Shelton
Keyword(s):  
Phenyl Group ◽  
Kinetic Mechanism ◽  
Oxidation Reactions ◽  
Chain Reaction ◽  
Instantaneous Rate ◽  
Initial Oxygen ◽  
Oxidation Of Olefins ◽  
A Minor ◽  
The Relationship ◽  
Kinetics Of

Abstract Three olefins were oxidized in the liquid phase with molecular oxygen to determine the kinetics of the oxidation reactions and the relationship to oxidation of rubber. The instantaneous rate of oxidation was found to be related to the analytically determined olefin and peroxide concentrations by the equation : Rate=k (unreacted olefin)(peroxide), where rate equals moles of oxygen per mole of original olefin per hour and the parentheses represent molarities. Presence of a phenyl group was found to affect k, but only in a minor way, indicating that the same fundamental kinetic mechanism applies in both aromatic and aliphatic olefins. The data are consistent with the general kinetic mechanism of Bolland involving oxygen attack at the alpha-methylenic group. However, it appears probable that initial oxygen attack can also occur at the double bond, resulting in the formation of a peroxide biradical, which may then react with other olefin molecules, initiating the usual chain reaction mechanism.

Survival to hatching of fishes in sulfate-saline waters, Devils Lake, North Dakota

1995 ◽  
Vol 52 (3) ◽  
pp. 464-469 ◽  
Author(s):  
Todd M. Koel ◽  
John J. Peterka
Keyword(s):  
North Dakota ◽  
Sodium Sulfate ◽  
Yellow Perch ◽  
Hatching Success ◽  
Perca Flavescens ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Devils Lake ◽  
Common Carp Cyprinus Carpio ◽  
Species Survival

Laboratory-based bioassays were conducted to determine concentrations of sodium-sulfate type salinities that limit the hatching success of several fish species. Survival to hatching (SH) was significantly lower (P < 0.05) in sodium-sulfate type waters from Devils Lake, North Dakota, of ≥ 2400 mg/L total dissolved solids (TDS) than in fresh water of 200 mg/L. In waters of 200, 1150, 2400, 4250, and 6350 mg/L TDS, walleye (Stizostedion vitreum) SH was 41, 38, 7, 1, and 0%; northern pike (Esox lucius) SH was 92, 68, 33, 2, and 0%; yellow perch (Perca flavescens) SH was 88, 70, 73, 0, and 0%; white sucker (Catostomus commersoni) SH was 87, 95, 66, 0, and 0%; common carp (Cyprinus carpio) SH was 71, 69, 49, 63, and 25%.

Metabolic Stores of Yellow Perch (Perca flavescens): Comparison of Populations from an Acidic, Dystrophic Lake and Circumneutral, Mesotrophic Lakes

1992 ◽  
Vol 49 (12) ◽  
pp. 2474-2482 ◽  
Author(s):  
Jay A. Nelson ◽  
John J. Magnuson
Keyword(s):  
Yellow Perch ◽  
Egg Production ◽  
Glycogen Content ◽  
Physiological State ◽  
Perca Flavescens ◽  
Population Level ◽  
Seasonal Effects ◽  
Life History Strategies ◽  
Dystrophic Lake ◽  
Lipid Contents

Little is known about the animals that occupy naturally acidic habitats. To better understand the physiological state of animals from temperate, naturally acidic systems, we compared metabolite stores and meristics of two yellow perch (Perca flavescens) populations in northern Wisconsin. One population originated from a naturally acidic, dystrophic lake (Acid-Lake-Perch, ALP) and had previously been shown to have enhanced tolerance to low pH. The second population came from two nearby interconnected circumneutral, mesotrophic lakes (Neutral-Lake-Perch, NLP). Perch were collected throughout the year to account for seasonal effects and to discern whether patterns of metabolite utilization differed between populations. ALP had smaller livers containing less glycogen and greater muscle glycogen content than NLP. The ALP also had significantly greater liver and visceral lipid contents, and females from this population committed a greater fraction of their body mass to egg production. We interpret these results as indicative of physiological divergence at the population level in yellow perch. These results are discussed as possible products of H+ -driven changes in metabolism and as possible products of different life history strategies between populations. Our results also show that perch living in acidic, dystrophic Wharton Lake are not acid stressed.

Walleye (Stizostedion vitreum vitreum) and Yellow Perch (Perca flavescens) Populations and Fisheries of the Red Lakes, Minnesota, 1930–75

1977 ◽  
Vol 34 (10) ◽  
pp. 1774-1783 ◽  
Author(s):  
Lloyd L. Smith Jr.
Keyword(s):  
Growth Rate ◽  
Yellow Perch ◽  
Climatic Factors ◽  
Perca Flavescens ◽  
Growing Season ◽  
Commercial Fishery ◽  
Class Strength ◽  
Parent Stock ◽  
Catch Statistics

In an investigation of the commercial fishery of Red Lakes, Minnesota, for the 46-yr period 1930–75, catch statistics were analyzed, and the dynamics of the perch and walleye populations were examined. Mean annual yields of walleye for two statistical periods, 1930–53 and 1954–75, were 309,900 and 245,100 kg, respectively for walleyes, and 96,400 and 109,500 kg for perch. Annual abundance (CPE based on average catches per day per 5-net units of gill nets) varied from 3.8 to 64.6 kg for walleye, and from 2.5 to 34.4 kg for perch. Causes of fluctuations in harvestable stock were directly related to strength of year-classes and to growth rate during the season of capture. Year-class strength was not related to the abundance of parent stock or of potential predators. The respective strengths of year-classes of perch and walleye in the same year were positively correlated (r = 0.859, P < 0.01), and are directly related to climatic factors. Growth rate of walleye in different calendar years varied from +30.7 to −42.2% of mean growth, and that of perch from +13.4 to −8.6% (1941–56). Growing season began in mid-June and was almost over by September 1. Walleye yield could be enhanced by starting harvest July 1 instead of early June. Perch yield could be improved by harvesting small perch. Key words: Percidae, Perca, population dynamics, Stizostedion, long-term yield

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