BIOLOGY Volume 2 - A Guide to General Biology - 2004

11. QUANTITATIVE ECOLOGY

11.5. Autecological Study

An autecological study involves investigating the maximum possible number of environmental factors interacting with a single species throughout its entire life cycle. The goal of the work is to provide as comprehensive a Description of the ecological niche of the studied species as possible. To gather sufficient material, the chosen species should be relatively common. Initially, as is standard practice, one reviews previously accumulated data on the species. At the same time, directions for future work are outlined—for instance, verifying conflicting data from previous researchers or exploring aspects they left unaddressed.

Usually, a detailed list of questions to be answered is prepared in advance. As a rule, reviewing published literature alone is not enough for this, although such research is fully justified, especially when dealing with papers that, for various reasons, are little known to the scientific community. Most often, however, researchers must conduct their own observations, measurements, and experiments over a period of at least a full year.

Below is a sample set of questions typically raised when studying an animal.

1. Classification. What is the name of the species? Which species are its closest relatives? What are its Similarities and differences compared to closely related species? What is its complete taxonomic description?

2. Habitat. Where does the species occur? What are the CHARACTERISTICS OF THE abiotic environment? How do abiotic factors change throughout the year?

3. Structure (Morphology). What are the characteristic Structural Features of an adult? How do its size and mass vary?

4. Locomotion. How does the animal move? Which body parts are involved in locomotion, and what are the Functions of these parts? How are these parts adapted to the environment?

5. Nutrition. What does the Organism feed on? When does it feed? How much does it consume? How is food acquired and ingested? What specialized mechanisms facilitate ingestion? Does the species possess any unusual features of Digestion AND ABSORPTION?

6. Respiration. Where are the gas exchange surfaces located? How does gas exchange occur? How much oxygen does the organism require?

7. Excretion. What are the End products of METABOLISM? How are they eliminated from the organism? What specialized excretory Organs does the organism possess?

8. Reproduction. Is the organism dioecious? What are the external differences between males and females? Are there specific courtship behaviors associated with mating? Is there territoriality? How does mating take place? When does mating occur? How frequently do individuals mate? How many Gametes do they produce? Where does Fertilization take place?

9. Life Cycle. How long does embryonic development last? Is there parental care, and if so, what form does it take? Are there larval stages, and if so, what are they like? At what age do individuals reach sexual maturity? What is the typical lifespan of an individual?

10. Behavior. How does the organism perceive external stimuli? Which stimuli does it primarily respond to? How are the major Sense Organs adapted to its way of life? What role does learning play? How does the organism react to other members of its species? How does the species respond to unfavorable weather conditions? How do individuals communicate with one another?

11. Ecology. What is the population size in a given area? What other species inhabit the same environment? How are they distributed within it? How is this species linked to others in the food chain and food web? Is it a host, parasite, or symbiont? What is its ecological niche?

A similar set of questions arises when studying a flowering plant. Naturally, they differ somewhat.

1. Classification. What is the name of the species? What subspecies, varieties, and ecotypes exist? What are the similarities and differences compared to closely related species? What is its complete taxonomic description?

2. Habitat.

a) Edaphic (soil) factors. What is the parent material? What is the type of soil profile? What is the depth of each horizon? What is the soil moisture content (field capacity)? What is the percentage of organic matter? What is the soil texture (particle-size composition)? What is its pH? What are the seasonal fluctuations in the Water table related to the plant's life cycle and distribution?

b) Climatic factors. What are the extreme and average temperatures of the habitat? What is the annual precipitation? What is the average relative humidity? What is the prevailing wind pattern (wind rose)? How much light does the plant receive?

c) Topographic factors. What slope aspects does the species prefer? Does it favor open or sheltered sites, flat or sloped areas? How does the distribution of the species depend on elevation above sea level?

3. Structure (Morphology). How well-developed is The ROOT System? What type of root system is present? What type of stem branching occurs? How many leaves are on each branch? What is the shape of the leaves? What are the variations in their length and width? What height does the plant reach?

4. Physiology. What pigments are present in the leaves and petals? On which side of the leaf is Transpiration most intense? How does darkness affect The rate of transpiration? Does the water content of the leaves change throughout the day?

5. Reproduction

a) Flower. How many flowers does the plant produce? How many sepals, petals, stamens, pistils, and carpels are there, and what is their shape? What is the Variability in petal coloration? What pigments are present in the petals? When does flowering begin? What is its duration? How does pollination occur? What adaptations exist for pollination agents (wind, insects, etc.)?

b) Fruits and seeds. How are fruits formed? What is their structure? How many seeds are produced per flower? How are fruits and seeds dispersed? Over what distance?

c) Vegetative propagation. How does vegetative propagation take place? Which organs are involved? At what rate does the species clone colonize the area?

6. Life cycle. What type of seeds is produced? What conditions are required for their germination? When do they germinate in nature? What is the seed germination rate (percentage)? At what rate do shoots develop? What are the spatio-temporal limits of their growth? (Why do not all seedlings reach maturity?)

7. Ecology. Do the specimens grow individually or in groups (patches)? What are the patch sizes? What other species grow in the same habitat? How strong is the competition between the studied species and the surrounding species? Is the species a parasite, a host, or a symbiont? What is its relationship with animals in the food web? Does the species provide shelter or protection to animals? (if so, to which ones and in what way?) What is the ecological niche of the species?

Naturally, autecological studies can be conducted not only on flowering plants, but also on gymnosperms, mosses, ferns, Algae, Fungi, etc. The specific questions addressed by researchers are tailored to the taxonomic group in question.