Derek H. Ogle

Derek H. Ogle
Northland College · Natural Resources

23.98
 · 
PhD

About

33
Publications
6,478
Reads
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421
Citations
Introduction
I have an appointment in Mathematical Sciences at Northland College, where I teach primarily statistics courses. My research interests are related to the invasive ruffe, fish growth analysis, teaching statistics and fisheries science with R, and other projects of interest to my undergraduate students. I maintain the fishR webpage and wrote "Introductory Fisheries Analyses with R." derekogle.com
Research Experience
September 1996 - present
Northland College
Position
  • Professor (Full, Associate, Assistant)
September 1996 - present
Northland College
Position
  • Professor (Full)
May 1992 - September 1996
University of Minnesota Twin Cities
Position
  • Research Assistant
Description
  • PhD program
Education
May 1992 - September 1996
University of Minnesota Twin Cities
Field of study
  • Fisheries and Wildlife
May 1989 - May 1992
University of Minnesota Twin Cities
Field of study
  • Fisheries and Wildlife
September 1985 - May 1989
Northland College
Field of study
  • Environmental Studies (Biophysical)

Publications

Publications (33)
Book
Unfortunately, I cannot provide full text to this book. You may be interested in the on-line materials for the book, including a link to how to purchase it, but also links to supplements and R code scripts, at http://derekogle.com/IFAR/ https://www.crcpress.com/Introductory-Fisheries-Analyses-with-R/Ogle/9781482235203
Article
Full-text available
Estimating the time required (i.e., age) for fish in a population to reach a specific length (e.g., legal harvest length) is useful for understanding population dynamics and simulating the potential effects of length-based harvest regulations. The age at which a population reaches a specific mean length is typically estimated by fitting a von Berta...
Article
Recreational fisheries are valued at $190B globally and constitute the predominant way in which people use wild fish stocks in developed countries, with inland systems contributing the main fraction of recreational fisheries. Although inland recreational fisheries are thought to be highly resilient and self-regulating, the rapid pace of environment...
Article
Growth is an important metric in fisheries and aquaculture. Growth of small fish over relatively short periods of time is commonly modelled with an exponential function using instantaneous growth rate (g). Instantaneous growth rates are logarithmic and inherently difficult to interpret, but specific growth rates (SGR) express growth as the intuitiv...
Article
Full-text available
Age estimates of Lake Superior Kiyis Coregonus kiyi from scales and otoliths were compared and 12 years (2003–2014) of length frequency data were examined to assess year-class strength and validate age estimates. Ages estimated from otoliths were precise and were consistently older than ages estimated from scales. Maximum otolith-derived ages were...
Article
Full-text available
Pauly et al. (1992; Australian Journal of Marine and Freshwater Research 43:1151–1156) introduced a modified von Bertalanffy seasonal growth function that allowed for a period of no growth. Pauly et al. (1992) provided special purpose software to fit the model to length-at-age data, but this software is no longer available and specific details to i...
Poster
Full-text available
An index of biotic integrity (IBI) provides fishery professionals a single value to rapidly assess aquatic communities and evaluate restoration efforts within those communities. An IBI accounts for the structure, composition, and functional organization of the biological community. To address the difficulty of characterizing fish assemblages in lar...
Article
Full-text available
Gray Jays (Perisoreus canadensis) are resident, boreal birds of northern Wisconsin, typically associated with Black Spruce (Picea mariana) bogs. Gray Jays cache perishable food items for over-winter consumption, and are therefore dependent on cold weather and the antibacterial and antifungal properties of the Black Spruce trees in which they store...
Article
Full-text available
Pygmy Whitefish ";Prosopium coulterii" are a small, glacial relict species with a disjunct distribution in North America and Siberia. In 2013 we collected Pygmy Whitefish at 28 stations from throughout Lake Superior. Total length was recorded for all fish and weight and sex were recorded and scales and otoliths were collected from a subsample. We c...
Poster
Full-text available
In the Laurentian Great Lakes, nonnative Rainbow Smelt (Osmerus mordax) provide forage for Lake Trout (Salvelinus namaycush) and other predatory fish and are potential competitors with and predators of young Coregonus species. In recent years, their populations have declined across the Laurentian Great Lakes. This study is centered on Whitefish Bay...
Article
Full-text available
Burrowing mayflies (Ephemeroptera: Ephemeridae) are sensitive to pollution and have been used as environmental indicators in the Great Lakes. Hexagenia limbata and Ephemera simulans population abundance and biomass estimates from Chequamegon Bay, Lake Superior, were compared between the years 2002 and 2012 as well as inside and outside the Northern...
Article
The growth of many organisms is seasonal, with a dependence on variation in temperature, light, and food availability. A growth model proposed by Somers (Fishbyte 6:8–11, 1988) is one of the most widely used models to describe seasonal growth. We point out that three different formulae (beyond numerous typographical errors) have been used in the li...
Article
Full-text available
The ability to reduce a population of ruffe (Gymnocephalus cernuus) with intense repeated bottom trawling was examined at two locations in Chequamegon Bay of Lake Superior. Trawling significantly depleted the population at the Kakagon River site but not at the Second Landing site. At least 93% of the estimated population of ruffe was removed from t...
Article
Full-text available
The temporal signature technique can be used to assign age to fish that show an incomplete or indistinct growth history at the margins of their scales. The temporal signature technique matches part of an individual's "environmental" growth history to characteristic patterns found in a master chronology that was developed from reliably aged specimen...
Article
Full-text available
A Bayesian approach for assigning probabilities to ages assigned by the temporal signature technique is developed and applied to a sample of fish. Temporal signatures are characteristic growth patterns found on fish calcified structures that can be used to assign ages to fish that exhibit only partial growth histories. Bayesí theorem is used to cal...
Article
Full-text available
This study investigated outcomes of a college outdoor orientation program that utilized 3, 4, 5, and 12-day adventure based trips. Sense of community and sense of place were measured using a one-sample pre/post-test design (n = 118). Paired sample t-tests were implemented to explore differences and, in general, students reported significant changes...
Article
Full-text available
Ruffe Gymnocephalus cernuus length–weight data from 141 data sets were obtained from a variety of waters across Europe and the Laurentian Great Lakes for summarization and development of standard weight (Ws) equations. The mean slopes of the length–weight relationships from all populations and for all percentiles except the 95th percentile were not...
Article
Full-text available
The ruffe is a percid native to Europe and Asia that has invaded several new areas in the last several decades. For population studies ruffe are often frozen en masse after collection in the field and thawed at a later time for measurements of length and weight. I determined the effect of freezing and thawing on ruffe total length (TL) and weight (...
Article
Full-text available
More than 200 schools currently use some form of the Outward Bound-adapted model of outdoor orientation (OO). Assisting students with the transition to college is a primary goal of these programs (Bell, Holmes, Vigneault, & Williams, 2008). This study was conducted at a small Midwestern liberal-arts college with a strong environmental mission. Part...
Article
Full-text available
Baited modified minnow traps are often used to collect rusty crayfish (Orconectes rusticus), an invasive species in many areas of North America. However, the use of baited traps as a collection gear for decapods has received considerable scrutiny. We designed a tank-experiment to determine if captured rusty crayfish exclude uncaptured rusty crayfis...
Article
Full-text available
The diet of larval (3-17mm total length) ruffe (Gymnocephalus cernuus) is described from samples collected in 1994 at two locations in the St. Louis River Harbor, a tributary to Lake Superior. Copepoda, Daphnia spp., and Bosmina longirostris dominated the diet of larval ruffe in the St. Louis River Harbor. Larger Copepoda and Daphnia spp. occurred...
Article
Full-text available
The ruffe (Gymnocephalus cernuus), a Percid native to Europe and Asia, has recently been introduced in North America and new areas of Europe. A synopsis of the biology and life history of ruffe suggests a great deal of variability exists in these traits. Morphological characters vary across large geographical scales, within certain water bodies, an...
Article
Full-text available
We investigated two assumptions about scales of hatchery-reared lake trout Salvelinus namaycush stocked as yearlings into Lake Superior: (1) only one check is formed during hatchery life and (2) a “stocking check” forms when the fish are released. We examined four scales from each of 176 fish prior to release from five hatcheries and 55 fish soon a...
Article
Full-text available
The ruffe Gymnocephalus cernuus, an exotic Eurasian percid, recently became es- tablished in the St. Louis River estuary. Lake Superior, after accidental introduction. Management actions (catch regulations and stockings) were enacted in 1989 to increase the density of top-level predators in the estuary, and thus to increase predation on ruffe. We c...
Article
Full-text available
Ruffe Gymnocephalus cernuus, a percid native to Europe and Asia, is established in the Lake Superior drainage and could have negative impacts on native fish through competition for forage and predation on fish eggs. We investigated the diet of ruffes in the 4,654-ha St. Louis River estuary in May–October 1989–1990 and the feeding periodicity of ruf...
Article
Full-text available
—The ruffe Gymnocephalus cernuus, an exotic Eurasian percid, recently became es- tablished in the St. Louis River estuary. Lake Superior, after accidental introduction. Management actions (catch regulations and stockings) were,enacted,in 1989 to increase the density,of top-level predators in the estuary, and thus to increase predation on ruffe. We...

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Projects (2)
Project
The RFishBC package helps fisheries scientists collect growth data from calcified structures and back-calculate estimated lengths at previous ages. The package is intended to replace much of the functionality provided by the now out-dated fishBC software. See http://derekogle.com/RFishBC/
Project
Explore methods to model growth of fishes from lengths recorded at tagging and subsequent recapture times. In particular, explore methods to handle multiple recaptures of individual fish.