Jeffrey C Johnson

Jeffrey C Johnson
University of Florida | UF · Department of Anthropology

Ph.D., Preeminent Professor of Anthropology

About

106
Publications
37,028
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,253
Citations
Additional affiliations
August 1986 - present
University of Florida
Position
  • Professor

Publications

Publications (106)
Article
Full-text available
One goal of ecosystem-based management is studying an ecosystem and its people, the socio-ecological system, in a qualitative and quantitative modeling approach that can provide management agencies with possible outcomes of their actions using scenario forecasting. Ecosystem-based fisheries management strives to use the socio-ecological system appr...
Article
Full-text available
What drives the formation and evolution of the global refugee flow network over time? Refugee flows in particular are widely explained as the result of pursuits for physical security, with recent research adding geopolitical considerations for why states accept refugees. We refine these arguments and classify them into explanations of people follow...
Article
There can be few indoor workplaces that are more subject to the meteorological and atmospheric conditions of their locations than permanent stations on the high, inland polar plateau of Antarctica. The US Amundsen-Scott South Pole Station is such a workplace, totally isolated during the 8–9 months of the austral winter, more than 800 miles (1287 km...
Article
Full-text available
Sample size determination for open-ended questions or qualitative interviews relies primarily on custom and finding the point where little new information is obtained (thematic saturation). Here, we propose and test a refined definition of saturation as obtaining the most salient items in a set of qualitative interviews (where items can be material...
Data
GLM statistical model results for the 28 examples. (DOCX)
Data
The original data for the 28 examples. (XLSX)
Preprint
Full-text available
Trawling has been shown to cause high mortality of discarded species (bycatch) and short-term ecological disturbance to bottom communities in coastal systems, resulting in lowered benthic biomass. Here we report evidence of a trawling-induced trophic cascade resulting in an increase in biomass of benthic polychaetes after the end of the shrimp traw...
Article
This article offers a way to measure agreement in participatory mapping. We asked subject matter experts (SMEs) to draw where Sudanese ethnic groups were located on a map. We then used an eigenanalysis approach to determine whether SMEs agreed on the location of ethnic groups. We used minimum residual factor analysis to assess the extent of interin...
Article
We show how land-use change can affect fisher-harvesting behavior. We test whether fisher harvesting behavior can be predicted by landscape change patterns at local (~ 200 km) and regional (~ 1200 km) levels. Our data suggest that fishers harvesting in areas near tree plantations reduced benthic-invertebrate harvests in favor of demersal and pelagi...
Article
Full-text available
We report on a rapid and practical method to assess social dimensions of performance in small-scale and industrial fisheries globally (Social Wellbeing in Fisheries Tool (SWIFT)). SWIFT incorporates aspects of security (fairness and stability of earnings, benefits of employment to local fishing communities, worker protection, and personal safety an...
Article
Full-text available
We inductively tested if a coherent field of inquiry in human conflict research emerged in an analysis of published research involving "conflict" in the Web of Science (WoS) over a 66-year period (1945-2011). We created a citation network that linked the 62,504 WoS records and their cited literature. We performed a critical path analysis (CPA), a s...
Data
A keyword visualization of “conflict” articles from the Web of Science in 2010. In this visualization, words were linked if that keyword combination appeared >59 times. Topics included all aspects of conflict, including biomedical, health, evolution, interpersonal, and organizational, in addition to governance, ethnic, environmental, and climate in...
Data
Pajek Commands used to create the critical path. (PDF)
Article
Full-text available
Humans who interact directly with local ecosystems possess traditional ecological knowledge that enables them to detect and predict ecosystem changes. Humans who use scientific ecological methods can use species such as mollusks that lay down annual growth rings to detect past environmental variation and use statistical models to make predictions a...
Article
We used stable isotope ratios of nitrogen (15N/14N) as a validation tool for determining the accuracy of the effective trophic levels computed in network analysis models for Core Sound, North Carolina, USA. Ecological network models (using Ecopath) were assembled for two trawling management areas, closed areas where shrimp trawling has been restric...
Article
The management of the spiny dogfish (Squalus acanthias) is a matter of international concern, as this species was a candidate for inclusion in lists for trade regulation. The major demand for its meat is from the European Union (EU) market, with the US and Canada as its two major contributors. The US has yet to support a spiny dogfish listing, alth...
Article
Today researchers need an efficient and valid approach to mine and analyze the large amount of textual information that is available. Automated coding approaches offer promise but a major concern is the accuracy of such codes in capturing the meaning and intent of the original texts. We compare the recall (number of codes identified) and precision...
Article
Full-text available
Mining textual sources of data can be used to design studies and test theories at temporal and spatial scales unheard of in the past. This opens up new opportunities for conflict studies and ethnographic research. We conducted a semi-automated network analysis of the 2003–2010 Sudan Tribune online news articles and modeled ethnic-group conflict in...
Conference Paper
A core question in ecology concerns the relative functional importance of species in communities and ecosystems. This information is useful for fisheries management as it can identify ecosystem components relevant for managing target species. Here, we apply the centrality concept from social network analysis to characterize the relative importance...
Conference Paper
Full-text available
Humans have caused significant impacts to ecological networks because of their fishing in coastal food webs – they are “keystone” species. Intensive fishing by humans often causes a trophic cascade (indirect effect), disproportionately affecting other species not the target of the fishery. To examine the potential for such indirect effects in both...
Conference Paper
Full-text available
Bottom trawling captures shrimp and a large number of non-target fish and invertebrate species (by-catch). Although 11,700 trawling trips have been recorded in Core Sound in areas open to trawling since 2001, this number has recently been declining to low levels. We used biological sampling and harvests from the North Carolina Division of Marine Fi...
Conference Paper
Core Sound, North Carolina, is an inshore estuarine area composed of nursery areas (closed to trawling) as well as waters open to trawling, creating an opportunity to study the ecological network impacts of commercial shrimp trawling. We used field collections, fisheries data from the NC Trip Ticket program, and Ecopath with Ecosim 6 to create four...
Conference Paper
Full-text available
The spiny dogfish is a shark of significant international commercial value and there is concern over its conservation status. The major demand for its meat is in the EU, where the species have been drastically over-fished. The US is one of the major exporters to this market, with a high demand for large adult females. The market demand led to over-...
Article
Full-text available
Mining textual sources of data can be used to design studies and test theories at temporal and spatial scales unheard of in the past. This opens up new opportunities for conflict studies and ethnographic research. We conducted a semi-automated network analysis of the 2003–2010 Sudan Tribune online news articles and modeled ethnic-group conflict in...
Article
Full-text available
When faced with understanding what is going on in a contested region or a military experiment it is often necessary to rapidly process vast quantities of textual data, assess the underlying situation, and identify changes early on. A human-in-the-loop approach for rapidly extracting the social and organizational networks, key activities, issues and...
Article
Full-text available
The US Long Term Ecological Research (LTER) program began in 1980 with the mission of addressing long-term ecological phenomena through research at individual sites, as well as comparative and synthetic activities among sites. We applied network science measures to assess how the LTER program has achieved its mission using intersite publications as...
Article
Full-text available
Population growth in U.S. coastal areas has spawned conflicts due to increasing competition between commercial and leisure uses of coastal resources. Organizations representing different user groups routinely misrepresent the causes and severity of environmental stresses to further their political and economic agendas, often predicting extinctions...
Article
This chapter examines the methods employed in research exploring the relationships between systems of human relations, or social networks, and people's interactions with various elements of natural ecosystems. Social networks are fundamental to understanding cultural systems of resource sharing; cooperation in hunting, fishing, and agricultural pro...
Article
Full-text available
Ecosystem components interact in complex ways and change over time due to a variety of both internal and external influences (climate change, season cycles, human impacts). Such processes need to be modeled dynamically using appropriate statistical methods for assessing change in network structure. Herewe use visualizations and statistical models o...
Article
Full-text available
Ethnobiologists debate whether folk biological classifiers are natural historians attending primarily to the morphology of organisms or are pragmatists concerned primarily with utility. We argue that this question is best understood as a problem in intracultural variation: the relative importance of form and function depends on who is asked to judg...
Article
Full-text available
In this chapter, we present two datasets from Africa, one rural and one urban, in which we examine the correlates of individual-level demographics and trusting and trustworthy behavior in economic experiments. We use a slightly modified version of the Joyce Berg, John Dickhaut, and Kevin McCabe investment game (1995). Our primary original contribut...
Article
Full-text available
This chapter examines how the stigma of AIDS results in negative attitudes and a lack of empathy toward persons with AIDS among high school students in Zambia. It describes attitudes toward HIV/AIDS and people living with HIV/AIDS among 204 male and female public high school students in Lusaka. The findings reveal that the pervasiveness of AIDS in...
Article
Full-text available
COMMERCIAL FISHERMEN HAVE BEEN characterized as a homogeneous collection of economically conservative, staunchly independent individuals living in relatively rural, highly integrated communities along the coast. Several factors are presently affecting these traditional communities, changing their character and changing commercial fishing itself. Th...
Article
Full-text available
Participant observation approaches have been important components of ethnographic research. Generally, however, observation has been emphasized over participation. But there are many ethnographic contexts in which active participation by the ethnographer is advantageous, if not essential, to the collection of quality data. This article provides a f...
Article
Full-text available
Monoclonal antibodies have begun to show great clinical promise for the treatment of cancer. Antibodies that can directly affect a tumor cell's growth and/or survival are of particular interest for immunotherapy. Previously, we described monoclonal antibody DMF10.62.3 that had antiproliferative and proapoptotic effects when it bound an antigen of u...
Chapter
Full-text available
Assessments of trophic structure through ecological network analysis (ENA) have been done in a wide variety of estuarine and coastal environments. For example, some have used it to compare trophic structures within ecosystems focusing on temporal conditions (Baird and Ulanowicz 1989; Baird et al. 1998) and among ecosystems focusing on spatial condi...
Article
We recently reported on the use of cDNA subtraction combined with microarray based expression analysis for identifying genes that are differentially over-expressed in small cell lung carcinoma. One of the several hundred genes identified using this approach was termed L985P and its molecular characterization is described in this report. The differe...
Article
Full-text available
Differences in patterns of psychosocial adaptation under conditions of prolonged isolation and confinement in Antarctica were examined to determine the extent to which they were influenced by national culture in general and the individualist-collectivist orientation of national cultures in particular. The Profile of Mood States and measures of stru...
Article
The influence of isolation and confinement on social support and depressed mood was examined in a study of 235 men and women who spent a year at McMurdo Station in Antarctica, and a study of 77 men and women who spent a year at the Amundson-Scott South Pole Station. Although availability of support remained unchanged, there was a significant decrea...
Article
Full-text available
This paper explores the use of visualization methods at two different levels of analytical detail (e.g., moving from a time-independent aggregated view to a more detailed time series analysis) of data derived from Reuters news tickers between September 11 and November 15, 2001. This data comprises a large, complex set of related words that presents...
Article
Full-text available
This article reports on the evolution of network structure as it relates to formal and informal social roles in well-bounded, isolated groups. Research was conducted at the Amundsen-Scott South Pole Station. Data were collected on crewmembers' networks of social interaction over each of three winter-over periods, when the station is completely isol...
Article
Full-text available
This article reports on the evolution of network structure as it relates to formal and informal social roles in well-bounded, isolated groups. Research was conducted at the Amundsen-Scott South Pole Station. Data were collected on crewmembers' networks of social interaction over each of three winter-over periods, when the station is completely isol...
Article
We present a graph theoretic model of analysing food web structure called regular equivalence. Regular equivalence is a method for partitioning the species in a food web into "isotrophic classes" that play the same structural roles, even if they are not directly consuming the same prey or if they do not share the same predators. We contrast regular...
Article
In recent years a consensus has emerged from molecular phylogenetic investigations favoring a common endosymbiotic ancestor for all chloroplasts. It is within this conceptual framework that most comparative analyses of eukaryotic biochemistry and genetics now are interpreted. One of the first and most influential sources of data leading to this con...
Article
Full-text available
We established trophic guilds of macroinvertebrate and fish taxa using correspondence analysis and a hierarchical clustering strategy for a seagrass food web in winter in the northeastern Gulf of Mexico. To create the diet matrix, we characterized the trophic linkages of macroinvertebrate and fish taxa present inHalodule wrightii seagrass habitat a...
Article
Recent studies have found that individuals tend to see themselves as more central in a network than they really are. This body of work has generally been done among small groups of <30 actors. Additionally, settings have usually been in a well-bounded social context focusing on friendship or work relations. Other related research has found links be...
Article
Mammaglobin, a promising diagnostic marker for breast cancer, forms a covalent complex with lipophilin B. mRNA levels for each component of the complex were determined for a number of breast tumors and normal tissues, and correlation of message expression was highly significant between mammaglobin and lipophilin B (p < 0.0001). The complex was puri...
Article
Three eukaryotic lineages generally are believed to have plastids that are primary in origin; that is, descended directly from a cyanobacterial endosymbiont. The recovery of these plastids as a monophyletic group in most molecular phylogenetic analyses, along with similarities in genome content and protein targeting mechanisms, have been cited as s...
Article
Middle ear infection, also known as otitis media (OM), is a major public health problem among American children. Although clinical and epidemiological aspects of OM have been intensely studied, cultural factors that may be contributing to the problem of OM have received less attention. This article presents findings from an ethnographic study explo...
Article
Full-text available
Analyses of data collected in Antarctica since 1963 were conducted to identify features of behavior and performance likely to occur during long-duration missions in space. The influence of mission duration and station latitude on POMS mood scores was examined in 450 American men and women who wintered-over in Antarctica between 1991 and 1998. The i...
Article
Full-text available
To determine which, if any, characteristics should be incorporated into a select-in approach to screening personnel for long-duration spaceflight, we examined the influence of crewmember social/ demographic characteristics, personality traits, interpersonal needs, and characteristics of station physical environments on performance measures in 657 A...
Article
Full-text available
Earlier research has shown a relationship between various forms of structural centrality and perceived leadership and role satisfaction in small experimental groups. The limited amount of research on this topic in naturally occurring social networks has yielded results that often conflict with one another. Different results have generally been attr...
Article
Full-text available
Evidence of a specific pattern of performance decrement in isolated and confined (ICE) environments has not been consistently demonstrated in previous research. Decrements in performance in ICE environments: a) occur in a linear, dose-response manner; b) occur in stages; or c) do not occur at all. There were 83 members of the United States Antarcti...
Article
Full-text available
Behavioral observations and sociometric ratings were assessed in separate 3- and 4-year-old child care classes across a two year period. A cross sequential design included three cohorts. Cohort A was observed at age 4, Cohort B at ages 3 and 4 and Cohort C was observed at age 3 yielding two separate cross sectional comparisons and a longitudinal co...
Article
Full-text available
Human perceptions of the relationship between pollution and food safety are often haphazard and contradictory, based on a variety of sources of information. Recent media events concerning seafood and coastal pollution have generated concern that an otherwise healthy food— fish and shellfish—has become dangerous. We assess consumer knowledge about s...