Modeling turbidity type and intensity effects on the growth and starvation mortality of age-0 yellow perch

2014 ◽  
Vol 71 (10) ◽  
pp. 1544-1553 ◽  
Author(s):  
Nathan F. Manning ◽  
Jonathan M. Bossenbroek ◽  
Christine M. Mayer ◽  
David B. Bunnell ◽  
Jeff T. Tyson ◽  
...  
Keyword(s):  
Algal Blooms ◽  
Yellow Perch ◽  
Laboratory Data ◽  
Population Level ◽  
Water Clarity ◽  
Growth Potential ◽  
Feeding Rates ◽  
Turbidity Level ◽  
Consumption Rates ◽  
Visual Predator

We sought to quantify the possible population-level influence of sediment plumes and algal blooms on yellow perch (Perca flavescens), a visual predator found in systems with dynamic water clarity. We used an individual-based model (IBM), which allowed us to include variance in water clarity and the distribution of individual sizes. Our IBM was built with laboratory data showing that larval yellow perch feeding rates increased slightly as sediment turbidity level increased, but that both larval and juvenile yellow perch feeding rates decreased as phytoplankton level increased. Our IBM explained a majority of the variance in yellow perch length in data from the western and central basins of Lake Erie and Oneida Lake, with R2 values ranging from 0.611 to 0.742. Starvation mortality was size dependent, as the greatest daily mortality rates in each simulation occurred within days of each other. Our model showed that turbidity-dependent consumption rates and temperature are key components in determining growth and starvation mortality of age-0 yellow perch, linking fish production to land-based processes that influence water clarity. These results suggest the timing and persistence of sediment plumes and algal blooms can drastically alter the growth potential and starvation mortality of a yellow perch cohort.

Development of a new field-based approach for estimating consumption rates of fishes and comparison with a bioenergetics model for lingcod (Ophiodon elongatus)

2009 ◽  
Vol 66 (4) ◽  
pp. 565-578 ◽  
Author(s):  
Anne H. Beaudreau ◽  
Timothy E. Essington
Keyword(s):  
Size Structure ◽  
Spatial Scales ◽  
Marine Reserves ◽  
Population Level ◽  
Specific Information ◽  
Feeding Rates ◽  
Bioenergetics Model ◽  
Ophiodon Elongatus ◽  
Consumption Rates ◽  
Rocky Habitats

Development of quantitative tools to characterize the nature of predator–prey interactions is an essential component of the science supporting ecosystem-based management and conservation. A common constraint is our capacity to estimate the feeding rates of fishes at the temporal and spatial scales at which predation occurs. This study developed a new field-based modeling approach for estimating consumption rates of large predatory fishes that requires fewer assumptions and may be more flexible than other field-based methods. We compared the field-based model results with consumption estimates from a bioenergetics model for lingcod ( Ophiodon elongatus ), a top predator in nearshore rocky habitats along the west coast of North America. The models were used to determine population-level consumption of rockfishes ( Sebastes spp.) by lingcod in marine reserves and nonreserve areas in the San Juan Channel, Washington, USA. Based on these models, rockfish consumption by lingcod may have been 5–10 times greater in marine reserves than in nonreserves during fall and summer, 2005–2007. Understanding whether lingcod predation may limit the efficacy of marine reserves for rockfish recovery requires site-specific information on the abundance and size structure of lingcod and rockfishes.

Water Quality Trends in Hamilton Harbour: 1987 to 1995

1996 ◽  
Vol 31 (3) ◽  
pp. 473-484 ◽  
Author(s):  
Murray N. Charlton ◽  
Robin Le Sage
Keyword(s):  
Algal Blooms ◽  
Action Plan ◽  
Secchi Depth ◽  
Water Clarity ◽  
Nutrient Loads ◽  
Hamilton Harbour ◽  
Near Shore ◽  
The Media ◽  
Park Area ◽  
Water Quality Trends

Abstract A series of water samples and Secchi depth measurements were conducted in Hamilton Harbour between 1987 and 1995. The data indicate little recent improvement in the harbour generally. Detection of real improvements may require high frequency sampling and a more extensive sample grid once a cause for improvement is in place. Some measures, such as chlorophyll and Secchi depth, approach RAP initial goals sometimes during recent years, but algal blooms still occur, which prevent attainment of satisfactory average conditions. The cause of aesthetic improvements in water clarity reported in the media was investigated with sampling along an inshore-offshore transect and intense Secchi measurements in the LaSalle Park area. The data are consistent with a transient clarifying effect of zebra mussels on structures near shore. The need to reduce nutrient loads as recommended in the Remedial Action Plan continues.

Selection of water source for water transfer based on algal growth potential to prevent algal blooms

2021 ◽  
Vol 103 ◽  
pp. 246-254
Author(s):  
Yongjun Song ◽  
Jing Qi ◽  
Le Deng ◽  
Yaohui Bai ◽  
Huijuan Liu ◽  
...  
Keyword(s):  
Algal Blooms ◽  
Algal Growth ◽  
Water Source ◽  
Water Transfer ◽  
Growth Potential ◽  
Algal Growth Potential ◽  
Selection Of

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.

Seagrass responses to and recovery (?) from seven years of brown tide

1999 ◽  
Vol 5 (4) ◽  
pp. 306 ◽  
Author(s):  
C. P. Onuf
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Seagrass Meadow ◽  
Water Clarity ◽  
Brown Tide ◽  
Halodule Wrightii ◽  
Clear Water ◽  
High Concentration ◽  
Grass Meadow ◽  
Reduced Light

Most harmful algal blooms are relatively short, violent paroxysms to aquatic systems. The Texas brown tide was unique in its 7-year domination of upper Laguna Madre wherein it reduced light penetrating 1 m from 31 to 63% on an annual basis between June 1990 and May 1997. In response, seagrasses declined in biomass in deep areas for two years. Over the next three years, bare areas opened up in the deepest areas of the seagrass meadow and the outer seagrass boundary retreated landward. In the last two years of the brown tide, regression of the dominant species, Halodule wrightii, slowed and stopped, and Halophila engelmanni, a previously minor species, revegetated some areas. Subsequent to cessation of meadow retreat, water clarity improved to pre-brown tide levels, consistent with the hypothesis that regeneration of nutrients from retreating sea grass meadow may have been the source of the nutrient subsidy required to sustain the brown tide at high concentration. However, after a short interlude of clear water and Halodule recovery, a resurgence of the bloom occurred and areas of regrowth succumbed. Although human activities did not seem to be involved in initiation or persistence of the brown tide, nutrients brought in by runoff from agricultural lands may have contributed to the return of bloom conditions.

Differential absorption of biochemical components in the diet of the cockle Cerastoderma edule: enzymatic responses to variations in seston composition

1996 ◽  
Vol 74 (10) ◽  
pp. 1887-1897 ◽  
Author(s):  
I. Ibarrola ◽  
J. I. P. Iglesias ◽  
E. Navarro
Keyword(s):  
Digestive Gland ◽  
Algal Blooms ◽  
Organic Content ◽  
Simultaneous Increase ◽  
Feeding Rates ◽  
Natural Sediment ◽  
Digestive Tube ◽  
Cerastoderma Edule ◽  
Food Quantity ◽  
Biochemical Components

Cockles (Cerastoderma edule (L.)) were fed different diets composed of freshly collected natural sediment and cells of Tetraselmis suecica mixed in different proportions. The experimental diets were designed to reproduce a simultaneous increase in both food quantity and organic content such as that brought about by algal blooms in either phytoplankton or microphytobenthos. Clearance, ingestion, and absorption rates, absorption efficiencies of specific biochemical components, and amylase, cellulase, laminarinase, and protease activities of the digestive gland were measured after 3 days of exposure to the diets. As food availability rises, net absorption rates are maximized by means of two mechanisms: (i) feeding rates are adjusted, with resulting regulation of the total amount of food entering the digestive tube, and (ii) rates of digestive investment contributing to digestion are varied according to food quality. The mass of the digestive gland, as well as specific and total cellulase activities, show positive correlation with the organic content of the food, which results in improved absorption of carbohydrates from high-quality diets. The costs incurred would be mainly in the form of increased metabolic faecal losses, which may explain the recorded negative effects on net absorption of lipids.

Study on the Selective Grazing of Zooplankton in Plankton Ecosystem

2013 ◽  
Vol 864-867 ◽  
pp. 17-21
Author(s):  
Yan Lin Zheng ◽  
Zhuo Ying Lv
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Marine Ecosystem ◽  
Laboratory Data ◽  
Ecosystem Dynamics ◽  
Human Environment ◽  
Grazing Behavior ◽  
Toxic Phytoplankton ◽  
Type Iv ◽  
Selective Grazing

Harmful algal blooms (Habs) caused great harm to the human environment. Habs occurrence was connected with other types of plankton. This relationship may be restrictive, and may also be promotional. Selectivity of zooplankton grazing has an important influence on the Habs. The behavior of zooplankton selective grazing was studied in the plankton ecosystem formed by three populations of nontoxic phytoplankton-toxic phytoplankton-zooplankton (NTP-TTP-Z) system. The selective grazing function of zooplankton on toxic phytoplankton and non-toxic phytoplankton was built based on Holling type IV functional response. Numerical simulation was given depending on the laboratory data. Results show that the models nicely explained the selective grazing behavior of zooplankton in the three species ecosystem, and provided key parameters for the marine ecosystem dynamics models.

Response of yellow perch (Perca flavescens) in Oneida Lake, New York, to the establishment of zebra mussels (Dreissena polymorpha)

2000 ◽  
Vol 57 (4) ◽  
pp. 742-754 ◽  
Author(s):  
C M Mayer ◽  
A J VanDeValk ◽  
J L Forney ◽  
L G Rudstam ◽  
E L Mills
Keyword(s):  
New York ◽  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Water Clarity ◽  
Zebra Mussels ◽  
Oneida Lake ◽  
Zooplankton Size ◽  
Adult Growth

We used long-term data on Oneida Lake, New York, to evaluate hypotheses about the effects of introduced zebra mussels (Dreissena polymorpha) on yellow perch (Perca flavescens). We detected no change in survival, diet, or numbers of young-of-the-year (YOY) yellow perch. YOY growth increased in association with zebra mussel introduction and was marginally correlated with zooplankton size, which increased after zebra mussel introduction. Low numbers of YOY in recent years did not explain their increased growth rate. The percentage of age 3 and older yellow perch that consumed zooplankton and benthos increased after zebra mussel introduction. Water clarity, which has increased since zebra mussel introduction, was inversely related to the percentage of the adult population with empty stomachs and positively related to the percentage that consumed benthos. The percentage of adult yellow perch that consumed zooplankton was positively related to zooplankton size. Despite the increase in percentage of adults consuming both types of invertebrate prey, we detected no changes in adult growth associated with zebra mussel introduction. This suggests that the principal effects of zebra mussels on yellow perch in Oneida Lake were not via benthic pathways but through modifications of water clarity and zooplankton. Thus far, these effects have not been negative for the yellow perch population.

Comprehensive Assessment of Clinical Outcomes for CLL Patients with Trisomy 12 (+12): Results of a Population-Based Analysis of 822 CLL Patients in British Columbia (BC), Canada

Blood ◽  
2012 ◽  
Vol 120 (21) ◽  
pp. 3897-3897
Author(s):  
Alina S. Gerrie ◽  
Steven J.T. Huang ◽  
Helene Bruyere ◽  
Chinmay B. Dalal ◽  
Monica Anne Hrynchak ◽  
...  
Keyword(s):  
Protective Effect ◽  
Clinical Outcomes ◽  
Conflicts Of Interest ◽  
Univariate Analysis ◽  
Laboratory Data ◽  
Population Level ◽  
Population Based ◽  
Exact Test ◽  
Entire Cohort ◽  
Notch1 Mutations

Abstract Abstract 3897 Background: Important advances in the understanding of CLL pathogenesis include the discovery that NOTCH1 mutations are present in ∼28% of pts harboring +12. There is a need for improved understanding of the clinical outcomes of CLL patients (pts) with +12 on a population-level, as this subgroup is rapidly becoming the focus of biologic studies evaluating pathogenesis of disease and clinical trials investigating novel targeted therapies. In the province of BC, population 4.5 million, CLL pts receive uniform evaluation and therapy based on centrally derived protocols with FISH testing implemented since 2004. We sought to characterize the clinical outcomes of +12 in this large unselected population-based cohort of CLL pts. Methods: Clinical and laboratory data on all pts referred for CLL FISH testing at 1 of 3 BC cytogenetic labs from 2004–2011 were entered into the BC Provincial CLL Database and included in this analysis. Pts without a confirmed diagnostic date were excluded. Baseline features of pts with and without +12 were compared using Fisher's exact test for categorical and Wilcoxon rank sum test for continuous (cnts) variables. Primary and secondary endpoints were OS and TFS (defined as time from diagnosis [dx] to first therapy). Percent of abnormal (%abn) nuclei harboring +12 was evaluated for association with OS/TFS. Cox proportional hazard (PH) models were constructed to determine predictors of OS/TFS for the +12 cohort, including age at dx, sex, Rai stage (0, 1–2, 3–4), WBC at dx, CD38 positivity and concomitant 17p-, 11q- or deletion 13q (13q-). Cox PH models were also constructed to determine effect of +12 on TFS/OS for the entire cohort. Results: As of Dec. 2011, 882 pts had CLL FISH testing in BC of which 164 (19%) had +12 on their 1st FISH test: 8 (5%) with concomitant 17p-; 14 (9%) with 11q-; 142 (86%) without either 17p- or 11q-, of which 43 (30%) had 13q-; 16/124 tested (13%) had an IGH translocation [t(IGH)]. Of the 164 +12 pts, median age at dx was 60 yrs (range 35–93), 70% were male, 10% had Rai stage 3–4. At median follow-up of 4.5 yrs (range 0–19), 95 pts (59%) received treatment, 31 (19%) died. For the +12 cohort, median OS was 14.7 yrs (95% CI 9.8–19.0) and median TFS 3.7 yrs (95% CI 2.7–5.4). Of the 658 non +12 CLL pts (N12CPs), prevalence of recurrent cytogenetic abnormalities (RCA) were: 17p-, 10%; 11q-, 11%; 13q-, 60%; t(IGH) 7%. Significant differences between +12 and N12CPs included more CD38+ pts (66% vs 28%, P<0.001), higher t(IGH) incidence (13% vs 7%, P=0.04) and fewer 17p- (5% vs 10%, P=0.03) or 13q- (26% vs 60%, P<0.001) abn among +12 pts. When pts were grouped by hierarchical FISH abn, +12 pts retained an intermediate OS (median 15.9 yrs) and TFS (median 4.2 yrs) when compared to other RCAs (Fig 1A). Multivariate analysis (MVA) for the whole cohort (n=822) demonstrated no significant effect of +12 on OS (HR 0.72, 95% CI 0.36–1.43, P=.35) or TFS (HR 0.86, 95% CI 0.69–1.36, P=.86) after adjustment for covariates. For the +12 cohort (n=162), univariate analysis demonstrated shorter OS associated with age (P=.001), Rai stage (P=.01) and 17p- (P=.07). A longer OS was associated with presence of 13q- (median OS 11.6 vs 18.7 yrs, P=.04), Fig 1B. Shorter TFS was associated with Rai stage (P<.001), WBC at dx (P=.01) and 17p- (P=.04). %abn nuclei harboring +12 was not predictive of OS (P=.33) or TFS (P=.25) as a cnts variable; however those with <20% vs ≥20% abn had a significant improvement in OS (P=.02). MVA for the +12 cohort demonstrated Rai stage (HR 3.26, 95% CI 1.23– 8.63, P=.02) and 11q- (HR 9.07, 95% CI 1.44–57.02, P=.02) as independent risk factors for OS, while 13q- did not retain its protective effect (P=.98). For TFS, MVA found Rai stage (HR 2.92, 95% CI 1.78–4.78, P<.001) and 17p- (HR 5.44, 95% CI 1.52–19.43, P=.01) as negative predictors while 13q- (HR 2.01, 95% CI 1.08–3.75, P=.03) again had a positive effect. Conclusion: We report the largest, population-based cohort of CLL pts with FISH testing and confirm that +12 occurs in 19% of CLL pts and in the absence of 17p- or 11q-, confers an intermediate prognosis. The presence of 13q- had a protective effect on TFS and a trend towards improved OS, thus improving the prognosis of a subset of +12 pts. This finding is consistent with recent observations that NOTCH1 mutations and 13q- are mutually exclusive in +12 pts and may explain the clinical heterogeneity seen in this subgroup. Further research into these distinct subsets of +12 pts is warranted. Disclosures: No relevant conflicts of interest to declare.

Error in Estimation of Feeding Rates from Changes in Mean Body Mass

1988 ◽  
Vol 45 (8) ◽  
pp. 1494-1498 ◽  
Author(s):  
P. A. Cochran ◽  
K. J. Knutsen
Keyword(s):  
Food Intake ◽  
Food Consumption ◽  
Body Mass ◽  
Micropterus Salmoides ◽  
Feeding Rates ◽  
Growth Data ◽  
Typical Application ◽  
Consumption Rates ◽  
Actual Field ◽  
Change In Mean

Because of nonlinear relationships between body mass and many parameters in energetics models, rates of food intake calculated from change in mean body mass (a typical application of energetics models) do not necessarily equal true mean rates of food intake calculated from individual changes in body mass. Using both hypothetical data and actual field data for largemouth bass (Micropterus salmoides) marked with individually numbered tags, we show that discrepancies increase with variability in body mass but are negligible (< 3.5%) in all cases examined. Biased estimates of change in mean body mass, such as might result from size-selective mortality or sampling gear, can lead to substantial errors in energetics model estimates of mean food consumption rates. Use of growth data for individually marked fish in conjunction with an energetics model permits calculation of confidence intervals, statistical comparison of food consumption rates, and examination of relationships between foraging success and individual body mass.

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