Understanding primate behavior, its causes and functions. Developing an observational project to examine anthropological methodologies and project design.
Understanding behavior of wildlife is the key to understanding everything. Behavior includes the active and inactive states and represents the sum of the interactions an organism has with its world.
In primate behavior, understanding the inaction is as important as understanding the action. Due to the complexity of social structure in primate groups, behavior determines hierarchy, access to resources, access to mates, and more.
What exhibits behavior?
Evolution exerts pressure on the phenotype which is constructed by the interaction of the organism with its environment, the genetic makeup, development and phylogenetic history of the organism.
What causes behavior?
According to Tinbergen, there are two separate causes of behavior:
The ultimate cause of behavior is the suite of selective pressures that would have favored individuals with the genetic material that the current population begins life with.
One action can have several different causes. Using his original model of causation of behavior (above), Tinbergen then expanded his focus to tease apart the four narrow, causative answers to behavior. For one action, each of these four provides an explanation of the reason for the behavior.
The adaptive significance of behavior reflects our current understanding of that behavior. However, not all behavior is adaptive because the function of the behavior today may not be the same as in the context when it was favored by selection in the past, or exaptation. It is important to remember that selection is not instantaneous or based on single events and that selection operates on average or usual outcomes.
In describing the evolution of behaviors, there is a danger of “thinking backwards” evolutionarily. This can lead to errors by reaffirming the consequence or finding evidence that traits were “evolved for” specific tasks.
Key variables exist in assessing the function of a behavior. These include:
Behavioral expression is limited by the expression of the genotype/phenotype. This limits the range of potential behaviors available to the organism, and to fully understand the behavior it should be assessed across a range of groups, populations, and species. Evolutionarily, behaviors are constrained to acting to what is “good enough.” Evolution does not select for the best, but instead the most adequate, in all traits including behavioral traits. Evolutionary stable strategies (ESS) of behavior develop when not participating in a behavior becomes deleterious to the individual. Maladaptive behaviors can remain in a population through linkage with other traits, the lack of fine-tuning of natural selection, or through a possibility of multiple patterns/ranges of expression in a behavioral suite.
Observational Methods for the Study of Behavior: In the beginning there is the question. It all begins with the question.
If behavior is all the action and inaction performed by an individual, our record of that behavior is the perceived and written record of those actions and inactions. Our record is bound by our ability to perceive their interactions, and ultimately this limits our ability to understand behavior. Especially with primates, be wary of anthropomorphism and anthropocentrism.
Keep in mind that “these primates are not little humans, and that even if the action does reflect the same emotion, motive, or intention as a human would express under the same circumstances, the observer cannot prove it” (Patterson 2001).
Data collection methods: Careful methodology can help overcome our own bias.
Different types of methods can be utilized to collect different types of data. Not all data types are equal or appropriate for answering all questions. For example, duration data and event data are different types of data and so must be treated as such.
Sample Data Collection Sheet:
The Design, or How to build a project:
Primates in Perspective. 2007. eds. C. J. Campbell, A. Fuentes, K.C. MacKinnon, M. Panger, and S. K. Bearder. Oxford University Press.
Chapter 28: The New Era of Primate Socioecology. Overdorff and Parga.