Encyclopedia of Evolutionary Psychological Science

Living Edition
| Editors: Todd K. Shackelford, Viviana A. Weekes-Shackelford

Field Research

  • Emily LescakEmail author
Living reference work entry

Latest version View entry history

DOI: https://doi.org/10.1007/978-3-319-16999-6_2742-2

Synonyms

Definition

Gathering information by observing individuals in their natural setting.

Introduction

Field research (“fieldwork”) refers to information gathered by observing individuals in their natural setting. Field research can be both qualitative and quantitative in nature. Qualitative research emphasizes the importance of observing variables and their interactions. Quantitative research attempts to objectively gather data to make associations, comparisons, and predictions among variables. Field studies that sought to associate behavior with inter-individual interactions and/or the environment formed the foundation for the field of behavioral ecology (Martin and Bateson 2007).

Field research involves observations of free-living wild animals in their natural habitats while minimizing perturbations or disturbances to their environment or behavior. Field excursions may require some or all of the following (Lagler 1956): funding for travel, salary, supplies, and lodging; field assistants to help with data collection; information about the area; planning and coordination; and a schedule of tasks to be completed. Fieldwork may involve the observation, capture, and measurement of animals and collection of environmental data. Documenting the environment of the population under study is an interdisciplinary effort that may require knowledge of surveying, geology, chemistry, and botany.

Field studies can provide insight into the causes and complexities of animal behavior. Animals regularly interact with their environment through activities associated with breeding, eating, and movement. More accurate information may be obtained about these behaviors if they are studied in wild versus captive animals because captive individuals are often too constrained by artificial environments to behave naturally. Furthermore, evidence that a variable can influence behavior under laboratory conditions does not mean that it influences behavior of wild animals. Field studies, therefore, are invaluable for observing the full range of an animal’s behavior and understanding its ecological context. Observers are able to note the circumstances in which behaviors do and do not occur, which allow them to infer their function and proximate causes (Martin and Bateson 2007).

Exploratory data obtained from field observations can form the basis for follow-up experimental studies in artificial settings that can experimentally test for causality. Field studies aid understanding of how a behavior is adapted to a particular environment. Habitat can influence behavior, so it may be important to choose study sites that are in different environments to be able to generalize a species’ typical behavior (Martin and Bateson 2007). Scientists can conduct controlled field experiments, in which certain aspects of the environment are manipulated to test a hypothesis. For example, to test weaverbirds’ abilities to differentiate between their own eggs and those of other parents, researchers planted nests with the eggs of other parents (Lahti and Lahti 2002). By experimentally manipulating gull eggshells, Tinbergen (1962) learned that parents remove broken eggshells to reduce predation by crows.

Goals of Field Sampling

Field studies can help scientists understand how individuals or species interact within populations or ecosystems, anthropogenic effects on individuals or populations, and a population’s life history characteristics. Knowing the natural history and ecological context of organisms is also helpful in conservation efforts. Studies can focus on the distributions of populations/species, the presence/absence of a species in a given area (particularly a species that is threatened or invasive), determination of environmental limitations or advantages for a population, or obtaining specimens for further study in the lab.

Four main aspects of behavioral ecology can be addressed in field studies: action patterns, abundance, survivorship, and resource allocation (Bart et al. 1998; Table 1). When sampling behavior in the field, the first step is to define the behavior(s) of interest and then estimate how often they occur. Activity budgets can be quantified by recording the proportion of time spent engaging in a behavior, its frequency, or average duration. The definitions of behaviors of interest, often outlined in ethograms, need to be specific enough for different observers to be able to interpret them in the same way. Depending on the behavior, activities may be divided into bouts, or periods in which a behavior is engaged in frequently.
Table 1

Types of field observations, goals, sampling methods, and potential difficulties (Bart et al. 1998)

Type of observation

Goal

Methods

Difficulties

Behavior

Estimate time spent engaged in different behaviors

1. Scan sampling

2. Focal sampling

1. Observer influences behavior

2. Animals disappear out of sight

Abundance

Estimate trends in population size in time or space

Surveys

1. Changes in survey efficiency can influence estimates

2. Defining the trend in population size

3. Missing data

4. Variation in observer skill

5. Pseudoreplication

Survivorship

Estimate the number of individuals that survive in a given time period

1. Telemetry

2. Nesting success

3. Capture–recapture

1. Finding and following all nesting attempts

2. Monitoring efforts unevenly distributed over time

Resource selection

Determine why animals use some areas or consume some food items while not using or consuming others

1. Surveys of habitat use

2. Behavior sampling

Modeling complexity

When monitoring abundance, observers can estimate population size through time and/or space, often with regard to an ecological variable of interest. Population sizes may be estimated through the use of long-term surveys or telemetry. Field surveys can also lend insight into a population’s resource selection, the process by which animals use a specific area or consume certain food items, while not using or consuming others. Additional characteristics of a focal individual may also be recorded (Table 2).
Table 2

A description of an individual in the wild may include any or all of the following characteristics (Lagler 1956)

Category

Characteristics

Taxonomy

Genus and species

Range

Where is the organism found?

How do the current and original ranges vary?

What ecological factors influence the size of the range?

Distribution

What ecological factors influence distribution?

Physical description

Morphology

Color

Sexual dimorphisms

Foraging strategies

How do they change throughout development?

How selective is the individual in choosing food?

Does diet vary seasonally?

What are the daily food requirements?

How often does the organism eat?

How do they eat?

What factors influence what food is eaten and when?

Growth rate

What is the organism’s age, length, and weight?

Does the organism exhibit allometric growth?

What factors influence growth?

Reproduction

When is sexual maturity?

What is the sex ratio?

Are there courtship rituals?

When and how do individuals breed?

How fertile are individuals?

Do they exhibit parental care?

What is the offspring’s survival rate?

Are the breeders oviparous or semelparous?

What factors influence reproductive success?

Early development

What are critical environmental windows?

When does hatching occur?

How long is larval development?

What factors influence development?

Behavior

What movements are observed?

Does the species migrate?

Do individuals school?

Are they territorial?

Do you observe individuals learning?

Are individuals engaging in social behaviors?

What factors influence behavior?

Field notes typically contain detailed descriptions of the physical environment and individuals under study, including their behavior and communication with others. Methodological notes describe how data are acquired as well as justification of techniques used and may incorporate ideas for future studies.

Sampling Methods

An observer might engage in either focal individual or scan sampling (Lehner 1996). Focal sampling follows only one or a few individuals, while scan sampling involves periodic observations of all or a subset of individuals in a group. Observers may sample either continuously or intermittently. In continuous sampling, the start and end times or occurrences of behaviors are recorded during finite time intervals. Intermittent sampling provides snapshots of an animal’s behavior by recording their activity at regular intervals. Continuous sampling is best when only a few easily recognized behaviors are recorded that either occur infrequently or last a long time while. Intermittent sampling is preferred for recording fine-scale behaviors that may change rapidly. Decisions about the use of one technique over the other requires an evaluation of the pros and cons of obtaining a lot of data on a few focal individuals or limited data on a larger number (Cochran 1977). Intermittent and continuous observations are commonly combined with general observations of group dynamics (Bart et al. 1998). Basic information about the individual or population’s environment should also be reported (Table 3).
Table 3

When reporting the results of field studies, the following characteristics should be included as appropriate (Lagler 1956)

Basic background

Location

Nearby geographical features

Map, including source and cardinal directions

Coordinates

Natural history

Extent of development

Physical characteristics

Size of field site

Geological characteristics

Soil type

Ground cover

Vegetation type

Presence of dispersal corridors

Chemical characteristics

Temperature

Oxygen availability

Salinity

pH

Extent of pollution

Biological characteristics

Food sources

Predators

Competitors

One or a combination of sampling techniques may be employed (Bart et al. 1998). Simple random sampling refers to a situation in which all possible samples from the population are equally likely to be selected. Random sampling is not always feasible in natural settings, so nonrandom sampling may instead be used, particularly with regard to selection of focal animals. Researchers may choose to focus on individuals at a particular developmental stage or focal individuals distributed evenly across a population.

Sources of Error

Both observer influences on behavior and measurement bias are potential sources of error in field studies (Bart et al. 1998). It is not uncommon for animals to change their behavior in the presence of an observer, and the extent to which animals are affected may depend on species and/or life stage (Martin and Bateson 2007). Therefore, an acclimation or acceptance period may be required if the animal appears to react to the researcher. Acclimation periods are typically short but vary depending upon the species being studied. The presence of an observer can also influence the behavior of the focal species’ predators or prey. As a result, it is important for the observer to minimize disturbances and wait until after the acclimation period to collect data.

Hides or blinds may reduce disruption, but can restrict the observer’s ability to monitor individuals. An animal moving out of sight can result in selection bias, when data are not recorded at the scheduled time, or measurement bias, if the individual is hidden for only part of the scheduled observation time. While the use of a hide or blind reduces the ability of animals to see the observer, it does not prevent the animals from detecting the observer’s sounds or smells. To further minimize the likelihood of disrupting normal behavior, remote video cameras may be used. While they may not be able to observe all of the behaviors of the individuals under study, resulting in selection and/or measurement bias, they create a permanent record of the behavior that can be replayed and may also help detect behaviors that occur so rapidly that they are difficult to record accurately in real time (Martin and Bateson 2007). An additional benefit of having a permanent record of behavior is that follow-up studies may be conducted without having to return to the field site. Recorded behaviors may also be used as educational tools or deposited into open-access databases that are used by the research community.

Prominent Field Researchers

In the mid-1800s, Charles Darwin developed his theory of evolution by natural selection after conducting field observations of a variety of species while voyaging on his ship, the Beagle, and studying the plants and animals that were local to his home in England (Darwin 1859). In the 1920s–1930s, Margaret Morse Nice captured and marked sparrows in her yard and studied them throughout their development (Nice 1937). In the 1930s–1950s, Konrad Lorenz, Karl Frisch, and Nikolas Tinbergen developed the field of ethology, or the science of animal behavior. Their studies of numerous animal taxa, including birds, fish, and insects, helped researchers to better understand the causes of behavior, its evolution, and how it relates to fitness (Dewsbury 2003). At about this same time, J.H. Crook and David Lack used their studies of birds to develop a comparative approach to behavioral ecology in which they associated behaviors with the birds’ environments (Lack 1947; Crook 1964). Jane Goodall began working with chimpanzees in Tanzania in the 1960s (Goodall 1990). Through her decades of field observations, she greatly increased our understanding of primate behavior and documented behaviors that were previously thought to be unique to humans, including tool use and warfare. Her work has helped protect wild primates and has publicized issues of animal conservation.

Cross-References

References

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© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.University of Alaska AnchorageAnchorageUSA

Section editors and affiliations

  • Russell Jackson
    • 1
  1. 1.University of IdahoMoscowUSA