Gary D. Grossman

Gary D. Grossman
University of Georgia | UGA · Warnell School of Forestry and Natural Resources

PhD

About

155
Publications
39,417
Reads
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7,498
Citations
Citations since 2016
41 Research Items
2146 Citations
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2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Introduction
Gary D. Grossman currently works at the Warnell School of Forestry and Natural Resources, University of Georgia. Gary does research in Ecology, Fisheries, and STEM education.
Additional affiliations
July 1981 - present
University of Georgia
Position
  • Professor (Full)
October 1976 - June 1981
University of California, Davis
Position
  • PostDoc Position
February 1974 - May 1975
University of California, Berkeley
Position
  • student worker

Publications

Publications (155)
Article
Full-text available
Habitat loss and degradation are causing collapses in freshwater fish in the Mediterranean region, where habitat restoration actions are still hampered by poor understanding of fish habitat selection and fitness. Here, we combined field surveys and laboratorial experiments to investigate how water velocity, body size and intra-specific interactions...
Article
We quantified microhabitat use of Etheostoma inscriptum (Turquoise Darter) in 2 streams in the Oconee River watershed in the Georgia Piedmont using snorkeling observations during September 2020. This species has a restricted distribution, and little is known about its habitat associations. Principal component analysis indicated that Turquoise Darte...
Article
Optimality theory is useful for modeling habitat use in animals, although many models have not been rigorously tested. We evaluated the ability of the Grossman et al. net‐energy‐intake (NEI) optimal foraging model for drift‐feeding stream fishes, to predict the holding velocity (microhabitat) of native brook charr (BC; Salvelinus fontinalis) inhabi...
Article
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Habitat selection in drift feeding fishes, the majority of stream fishes in North America, is strongly affected by velocity, as well as other environmental and intrinsic characteristics of an individual drift feeder (e.g., size and dominance status). Our study subject, the Brook Charr (Salvelinus fontinalis Mitchill), is a widely distributed and ec...
Article
Open Educational Resources (OERs) represent any form of educational resource that is available free of charge. Few OERs exist for courses in fisheries or other life science courses, and the onset of the COVID‐19 epidemic only exacerbates the need for such resources. To rectify this shortcoming, we build on earlier work (Grossman and Chernoff 2018)...
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We quantified student perceptions of an active learning exercise, based on open-educational video resources, in both a first-year seminar class (Natural Environment of Athens and Georgia, three sections), and a larger lecture class (Natural History of Georgia [FANR 1200, two sections), designed for nonscience majors. Evaluation of STEM pedagogical...
Article
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Publication in peer–reviewed journals is essential for scientific progress including: (1) advancement of knowledge, (2) societal benefits including scientifically–based decision–making, (3) evaluation of researcher productivity, and (4) obtaining and retaining a research or faculty position and facilitating future scientific contributions. As scien...
Article
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We reviewed 199 published data sets (21 species) to assess the relative frequency of various density‐dependent processes in salmonids. We examined studies for the presence or absence of density‐dependence: in growth, mortality, fecundity and recruitment. Based on data from all studies pooled 71% showed density‐dependence in growth, 23% found densit...
Article
Although intraspecific interactions likely affect habitat choice and foraging behaviour in animals, our knowledge regarding how these factors interact is frequently limited to either lab or field studies, but not both. We observed pairs of dominant and subordinate drift-foraging Dolly Varden char (Salvelinus malma) in an Alaskan stream, and quantif...
Article
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Writing promotion and tenure evaluations for life scientists: thoughts on structure and content. Experts in a discipline are frequently called upon to provide external evaluations of promotion and tenure (P/T) candidates at other universities and research agencies. Nonetheless, there is scant published information on the techniques and strategies u...
Article
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Experts in a discipline are frequently called upon to provide external evaluations of promotion and tenure (P/T) candidates at other universities and research agencies. Nonetheless, there is scant published information on the techniques and strategies used to produce a thorough and insightful P/T evaluation. External P/T evaluations must be matched...
Research
Although intraspecific interactions likely affect habitat choice and foraging behaviour in animals, our knowledge regarding how these factors interact is frequently limited to either lab or field studies, but not both. We observed pairs of dominant and subordinate drift-foraging Dolly Varden char (Salvelinus malma) in an Alaskan stream, and quantif...
Article
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Species conservation requires understanding the mechanistic processes of habitat selection and their effects on fitness. Nonetheless, there are few fitness‐based habitat selection models for aquatic organisms. We examined multiple aspects of foraging behaviour of nonanadromous Dolly Varden Charr (Salvelinus malma) in Panguingue Creek, Alaska, USA a...
Article
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Little is known about the genetically distinct southern strain of Salvelinus fontinalis Mitchell (Brook Charr), a species that is likely to be negatively affected by global climate change at the southern extent of its range. We tagged 35 Southern Brook Charr between March and October of 2011 and sampled for movements in May and October 2011 and May...
Article
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Due to widespread stocking, Rainbow Trout (Oncorhynchus mykiss Walbaum) are perhaps the most widely distributed invasive species in the world. Nonetheless, little is known about the effects of stocked Rainbow Trout on native non‐game species. We conducted experiments in an artificial stream to assess the effects of hatchery Rainbow Trout on home ra...
Article
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Most fishes residing in temperate streams in the Northern Hemisphere are drift-feeders. Despite this fact, little is known about the mechanisms of drift-feeding itself. We used Alaskan Arctic grayling (Thymallus arcticus), an abundant boreal drift-feeder, to examine the effects of water velocity on several aspects of drift-feeding behavior and test...
Article
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Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time se...
Article
Full-text available
Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time se...
Article
Full-text available
Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community led open-source database of biodiversity time se...
Article
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We evaluated student perceptions of an inquiry-based, karaoke video exercise in six university classes ranging from first year to graduate level. Students created a 3-4 minute karaoke video on a topic relevant to class. Student responses to the project based on questionnaires and triangulation interviews were strongly positive. Students did not dem...
Article
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Habitat selection is an important phenomenon that may greatly affect individual fitness. Using an artificial stream, we examined the relationship between the percentage of prey captured, reactive distance, dominance, and water velocity for juvenile Chinook Salmon (Oncorhynchus tshawytscha) from the Chena River, Alaska, and tested the fitness-based...
Article
Full-text available
Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time se...
Article
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In this essay I describe aspects of the interactions between authors, reviewers and editors with the goal of helping early–career biologists navigate the publication process. Multiple authors and editors have commented on the current difficulties of obtaining quality referees for manuscript reviews, and as a consequence, the frequencies of rejectio...
Article
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We examined the relationship between density-independent and density-dependent factors on the demography of a dense, relatively unexploited population of brown trout in Spruce Creek Pennsylvania between 1985 and 2011. Individual PCAs of flow and temperature data elucidated groups of years with multiple high flow versus multiple low flow characteris...
Article
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Fisheries pedagogy frequently uses outdated instructional models, even though newer approaches, such as multimodal and active instruction, may result in better educational outcomes. We discuss a variety of innovative instructional approaches for fisheries classes, including multimodal learning via music videos, student karaoke videos, and active le...
Article
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A River Between Us (DVD, 90 minutes; Green Planet Films, 2015; http://www.greenplanetfilms.org) The struggle in the West over water has been long and bitter, pitting family farmers against Native Americans, fishers, and environmentalists. No case has brought more attention to these multiuser conflicts than the fight over habitat restoration for th...
Article
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The Sacramento-San Joaquin Delta (Delta) is a heterogeneous, highly modified aquatic system. I reviewed relevant predator-prey theory, and described extant data on predator-prey relationships of Delta fishes. I ranked predator consumption rates as occasional, moderate, and common, based on frequency-of-occurrence data, and evaluated the frequency,...
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This article discusses why one should vote for Hillary Clinton now that she has secured the Democratic nomination for president.
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We used long-term population data for rosyside dace (Clinostomus funduloides), a numerically dominant member of a stochastically organised fish assemblage, to evaluate the relative importance of density-dependent and density-independent processes to population persistence. We also evaluated the potential impacts of global climate change (GCC) on th...
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We describe the use of original music videos as instructional aides for a large non-science major course in natural history. The course meets university general education requirements for life sciences and environmental literacy. Over two class years (Fall 2012 and 2013), the senior author wrote and recorded five music videos to reinforce class lec...
Article
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Few studies have assessed the ecological role of regulated small rivers in the environmental biology of invasive largemouth bass Micropterus salmoides in Iberian waters.Size structure, diet, physical condition, and developmental stress of largemouth bass populations were compared between two contrasting habitats in the Iberian Peninsula, the Encina...
Article
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We hypothesized that distribution and microhabitat use by imperilled chub Squalius torgalensis in the Torgal stream, Portugal, during low flows, were related to spatial patchiness in physical resources and shifts in ontogenetic preferences. We mapped fish abundance and sampled microhabitat use and availability via snorkelling. We used the coefficie...
Article
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I discuss current issues in reviewing and editorial practices in ecology and evolutionary biology and suggest possible solutions for current problems. The reviewing crisis is unlikely to change unless steps are taken by journals to provide greater inclusiveness and incentives to reviewers. In addition, both journals and institutions should reduce t...
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Brook trout are the one of the only Salvelinus species native to eastern North America and range from Canada to Georgia. Very little is known, however, about the ecology of the southern form of this species. We quantified microhabitat use of southern brook trout in Ball Creek NC, a third-order stream, during six seasonal samples (summer 2010, autum...
Article
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Currently, there are few mechanistic fitness-based habitat selection models for stream fishes and most models used by management agencies focus on physical habitat alone. In this review, I describe the historical development and the status of mechanistic, fitness-based, habitat selection models for both water column (i.e., drift-feeding) and benthi...
Article
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Factors shaping individual behavior remain poorly understood for European cyprinids. We examined the effects of extrinsic (temperature and year) and intrinsic factors (body size and shoal size) on the daily activity of chub Squalius torgalensis, a critically endangered cyprinid found in the Torgal stream, Portugal. We quantified chub behaviors whil...
Article
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Rainbow trout have been introduced to six of the seven continents and currently are widely stocked for sport fishing. Despite their broad distribution, outside of New Zealand, little is known about the effects of rainbow trout on native species, especially fishes. We conducted experiments in an artificial stream to assess hypotheses that stocked ra...
Article
When members of a population choose patches that maximise individual net energy gain without interference, they are input matching, a strategy derived from the ideal free distribution (IFD) that results in equal rewards across all patches. We investigated the input matching abilities of yellowfin shiner, a recent invader, and rosyside dace, a commo...
Article
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1. Fisheries models generally are based on the concept that strong density dependence exists in fish populations. Nonetheless, there are few examples of long-term density dependence in fish populations. 2. Using an information theoretical approach (AIC) with regression analyses, we examined the explanatory power of density dependence, flow and wate...
Article
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Abstract Biological invasions are a major threat to global freshwater biodiversity. Competition is a frequent negative interaction between non‐native and native species, and this process is commonly quantified using indirect methods (e.g. dietary overlap, comparison of habitat use/selection). However, direct observation can provide crucial informat...
Conference Paper
Although the majority of drift-feeding fishes are cyprinids or other non-salmonid taxa, the majority of habitat selection models for drift feeders have been developed and tested with trout, charr, and salmon. We describe the development and current status of the drift-feeder microhabitat selection model of Grossman et al. 2002. This model has been...
Article
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We experimentally examined the effects of competition for space between rainbow trout (Oncorhynchus mykiss) and rosyside dace (Clinostomus funduloides) in an artificial stream. These species generally do not exhibit statistically significant differences in microhabitat use in Coweeta Creek, North Carolina, USA. Two competition (trout and dace) and...
Article
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Quantifying patterns of temporal trends in species assemblages is an important analytical challenge in community ecology. We describe methods of analysis that can be applied to a matrix of counts of individuals that is organized by species (rows) and time-ordered sampling periods (columns). We first developed a bootstrapping procedure to test the n...
Article
Summary1. We used information theoretic statistics [Akaike’s Information Criterion (AIC)] and regression analysis in a multiple hypothesis testing approach to assess the processes capable of explaining long-term demographic variation in a lightly exploited brook trout population in Ball Creek, NC. We sampled a 100-m-long second-order site during bo...
Article
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Stochastic dynamics are central to theory, data analysis, and un-derstanding in the fields of hydrology and population ecology. More importantly, hydrologic variability has been identified as a key process affecting biodiversity and coexistence in stream fish assemblages. Until recently, however, we have lacked tools by which hydrologic variability...
Article
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Studies demonstrating the mechanisms regulating biodiversity are uncommon. Streams and rivers worldwide display a longitudinal gradient in fish biodiversity, and most prior research has used correlative evidence to infer that higher downstream diversity is produced by factors facilitating greater niche separation. We combine 20 years of fish abunda...
Article
Abstract –  We evaluate the putative introduction of the yellowfin shiner, Notropis lutipinnis, in the Little Tennessee river basin. This species has only been noted in the Little Tennessee in the past several decades and appears to be expanding its range, even though there have been many potential historical pathways for dispersal from native drai...
Article
1. Habitat degradation and biological invasions are important threats to fish diversity worldwide. We experimentally examined the effects of turbidity, velocity and intra- and interspecific competition on prey capture location, reactive distance and prey capture success of native rosyside dace (Clinostomus funduloides) and invasive yellowfin shiner...
Article
Abstract – Fish diversity is strongly affected by habitat degradation (e.g., increased turbidity) and invasive species. We examined the effects of turbidity, velocity, length, dominance and intra- and interspecific competition on focal point depth, movement rate, dominance and aggression rate in native rosyside dace (Clinostomus funduloides) and in...
Article
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A resident intertidal fish assemblage at Dillon Beach, California, U.S.A., was persistent and resilient for a 42-month period. Data from a previous study indicated that productivity was the best predictor of several assemblage characteristics; hence, food resources may have been limiting in this assemblage. To determine whether food resource partit...
Article
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During a study of microhabitat use by gilt darters (Percinaevides), we compared two methods for quantifying microhabitat availability in a southern Appalachian stream (USA). The first method used stratified random sampling throughout the site and the second involved taking constrained random measurements within a 2-m radius of the focal fish. Darte...
Article
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We examined the relationship between habitat availability and nest site selection by southern two-lined salamanders (Eurycea cirrigera) during Spring 2002. We added natural slate tiles to two second-order streams in the Georgia Piedmont and surveyed the streams during the nesting season (April). Seventeen nests were found in Boscoe Creek and 20 in...
Article
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Abstract –  We examined microhabitat use by gilt darters (Percina evides) in two streams in the south-eastern USA. Darters were over-represented in erosional microhabitats with higher average velocities and more cobble. Male darters tended to show stronger selection than females. Size-based analyses showed that larger (≥60 mm) gilt darters tended t...
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We quantified the space use behaviors of juvenile and adult mottled sculpin Cottus bairdii over a 3-year period in Shope Fork, western North Carolina. Our objectives were to (1) quantify home range size, (2) determine whether the fish exhibit territorial behaviors, (3) characterize the relative stability of territories, and (4) relate temporal vari...
Article
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We used underwater observations to quantify microhabitat use for blackbanded, Percina nigrofaciata, turquoise, Etheostoma inscriptum, and tessellated, E. olmsteadi, darters in a 116m reach of a Piedmont stream during 2001–2002. The sampling period and the previous 12months were the first and second driest years on record, respectively. Spring 2002...
Article
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Understanding how variation in reproductive success is related to demography is a critical component in understanding the life history of an organism. Parentage analysis using molecular markers can be used to estimate the reproductive success of different groups of individuals in natural populations. Previous models have been developed for cases wh...
Article
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Identifying links between morphology and performance for ecologically relevant tasks will help elucidate the relationships between organismal design and fitness. We conducted a laboratory study to quantify the relationship between variation in body shape and prey-capture success in four drift-feeding minnow species. We offered drifting prey to indi...
Article
1. Although reservoirs are common aquatic habitats in Europe, there is little quantitative information on the spatial organisation of fish assemblages inhabiting their littoral zones. Consequently, we characterised fish assemblage structure in the littoral zone of a reservoir (Lake Pareloup) in SW France during late spring, summer and early autumn...
Article
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The effects of suspended sediment on nongame fishes are not well understood. We examined the effects of suspended sediment (i.e., turbidity) on reactive distance and prey capture success at spring–autumn (12°C) and summer (18°C) temperatures for rosyside dace Clinostomus funduloides in an artificial stream. Experimental turbidities ranged from 0 to...
Article
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We compared prey-orienting and rheotactic behaviors in a fluvial (Coweeta Creek) and lacustrine (Lake Michigan) population of mottled sculpin. Blinded sculpin from both populations exhibited unconditioned, mechanosensory based rheotaxis to low velocity flows. Whereas Lake Michigan sculpin generally showed increasing levels of positive rheotaxis to...
Article
Abstract— We quantified microhabitat use by members of a southern Appalachian stream fish assemblage over a ten-year period that included both floods and droughts. Our study site (37 m in length) encompassed riffle, run and pool habitats. Previous research indicated that species belonged to either benthic or water-column microhabitat guilds. Most s...
Article
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Microhabitat use was quantified in Barbus graellsii, Cyprinus carpio, Chrondostoma toxostoma, Esox lucius, Gobio gobio and Leuciscus cephalus in the lower Rio Matarrana, Spain. Fluctuations in numerical abundances of assemblage members increased during 1986-1987. These increased fluctuations were due to decreases in the abundances of Ch. toxostoma,...
Article
We used strong inference with Akaike's Information Criterion (AIC) to assess the processes capable of explaining long-term (1984–1995) variation in the per capita rate of change of mottled sculpin (Cottus bairdi) populations in the Coweeta Creek drainage (USA). We sampled two fourth-and one fifth-order sites (BCA [uppermost], BCB, and CC [lowermost...
Article
The reproductive condition of female Oligocottus snyderi Greeley during 18+ months at Dillon Beach, California was examined. Seasonal differences in reproductive condition were identified by diameter measurements of ovarian follicles in pre-vitellogenic, cortical alveoli and vitellogenic stages of development which showed that female O. snyderi app...
Article
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We describe and analyze a spatially explicit, individual-based model for the local population dynamics of mottled sculpin (Cottus bairdi). The model simulated daily growth, mortality, movement and spawning of individuals within a reach of stream. Juvenile and adult growth was based on consumption bioenergetics of benthic macroinvertebrate prey; ben...
Article
Over a 3-year period we examined variability in physical habitat structure and species richness, abundance and assemblage composition of fishes in 13 habitat patches in the Bernecei stream, Hungary. Principal component analysis of habitat structure data from patches elucidated a riffle-run-pool habitat gradient across patches. Temporal habitat vari...
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We studied fish biodiversity using landscape- and island biogeography-based approaches in two relatively undisturbed Hungarian streams in the Danube drainage (Bernecei stream [2nd order] and Kemence stream [3rd order]). We asked whether season, patch type (riffle or pool), stream, and position in the landscape affected fish species richness, assemb...
Article
Streams are characterized by high degrees of patchiness that could influence the role of predators in these systems. Here we assess the impact of predatory benthic fishes on benthic macroinvertebrate density, biomass, and community structure at the patch scale in a fourth order stream in the southern Appalachians. We tested the role of predation in...