Ecology Honor: a complete guide for Pathfinders

The Pathfinder Ecology Honor often turns into a list of words to memorize, from plankton to climax community. This guide explains the science behind the terms, shows why the ecological pyramid narrows toward the top, and turns the trash and air pollution requirements into a small data project.

The complete requirements for the Ecology Honor are in the catalog under code EN-044; here they appear in short form and without answers. Data checked on October 6, 2026.

🌿What is the Pathfinder Ecology Honor?

The Ecology Honor has the code EN-044 and belongs to the Nature Study area. According to the catalog, it was created in 1972 by the General Conference of the Seventh-day Adventist Church and sits at skill level 2, one step below Advanced Ecology (EN-045), which is level 3.

The word ecology was coined in 1866 by the German biologist Ernst Haeckel, from the Greek oikos, house, and logos, discourse: it is the study of the house where living things dwell. It suits Pathfinders who have already earned an honor on a group of animals or plants, and it makes a good Unit project: each member measures their own home, and the Unit compares the numbers.

📋What are the Ecology Honor requirements?

The table sums up what each of the eight requirements asks, all of them mandatory, without giving answers.

Catalog requirements (EN-044) in short form; suggested times by this guide.

📖How do you learn the 13 Ecology Honor terms without memorizing them?

The thirteen terms in requirement 1 fit into five families, organized in the table. Write the definitions in your own words.

The scale family works like a zoom that goes from population to community, to ecosystem, and to biome, the largest scale, which the guide to Brazil's biomes presents one by one. Habitat is a species' address on that map.

In the energy family, autotrophism is the ability to make your own food. Most autotrophs use sunlight, but the textbook Biology 2e (OpenStax) describes bacteria that live without light, as in the hydrothermal vents on the ocean floor, and get their energy from hydrogen sulfide. Part of the plankton is autotrophic: according to the U.S. National Oceanic and Atmospheric Administration (NOAA), about half of Earth's oxygen comes from the ocean, and most of that production comes from plankton. The basics are in the article on the food chain and the balance of nature.

In commensalism, one species benefits and the other neither gains nor loses, like a bird nesting in a tree or a pilot fish eating a shark's leftovers, both examples from OpenStax. Do not confuse it with mutualism, in which both sides gain.

The 13 terms of requirement 1 grouped by family, as organized by this guide.

🔺What is an ecological pyramid, and why can it be inverted?

An ecological pyramid is a drawing in steps: producers sit at the base, and each step above is a trophic level in the sequence of who eats whom. There are three types.

The narrowing shape comes from energy. According to the National Geographic Society, on average only 10% of the energy in one level reaches the next; the rest is lost as undigested food, as heat from respiration, and in organisms that die without being eaten. At Silver Springs, Florida, the transfer between the first two levels came to about 14.5%, according to OpenStax. After four to six transfers, there is not enough energy left to support another level.

The detail that trips up many students on tests: only the energy pyramid is always wide at the bottom. Pyramids of numbers and of biomass can be inverted, as the table shows.

For requirement 2, use animals you actually find in your region. Find out what each one eats and what eats it, and place it on the right step, which is not always the top. The guides to the Reptiles and Amphibians honors help you get to know these groups.

Sources: OpenStax, Biology 2e, section 46.2, and National Geographic Society.

🌱Ecological succession and climax community: how does nature rebuild itself?

Ecological succession is the gradual replacement of species in a place over time. According to OpenStax, primary succession starts on new land or exposed rock, such as after a volcanic eruption, with lichens and hardy plants as pioneers. Secondary succession starts after a disturbance, such as a fire, that leaves remnants of the previous community. The final stable stage is the climax community, which lasts until the next disturbance.

In Brazil's Atlantic Forest, the vegetation of secondary succession has a popular name in Portuguese: capoeira. A study by the Brazilian Agricultural Research Corporation (Embrapa) published in 2003 records that the biome's landscape is dominated by fragments of secondary vegetation, the capoeiras and capoeirões. The study describes a fragment about 38 years old in Oratórios, Minas Gerais, still at a relatively young successional stage.

A Unit activity: photograph the same spot on a vacant lot once a month and track the new plants that move in.

💧How do you make the poster of a small freshwater lake ecosystem?

Requirements 3 and 4 go together: an ecosystem brings together biological and physical factors, such as light, temperature, oxygen, and nutrients, and a small lake or pond shows that interaction on a poster.

Build the poster in layers: in the sunlit zone, phytoplankton, made up of algae and cyanobacteria, carries out photosynthesis and supports the food web; zooplankton, such as rotifers and small crustaceans, eats those algae; on the dark bottom, bacteria break down the dead organisms that sink. Use arrows to show who eats whom and a different color for the physical factors.

Also show how fragile the balance is. Nitrogen and phosphorus are limiting nutrients in lakes. In excess, coming from sewage or fertilizer, they trigger an algal bloom that, as it dies and decomposes, uses up the oxygen in the water and creates a dead zone, OpenStax explains.

Use your own photos from a visit with an adult, without going into the water, and review the guide on water safety.

🗑️How do you measure your household trash and your city's air pollution?

Requirements 5 and 6 become a mini data project. According to the Panorama of Solid Waste in Brazil 2025, from the Brazilian Association of Waste and Environment (Abrema), the country generated 81.6 million metric tons of municipal solid waste in 2024. Divided among the 212.6 million inhabitants estimated by the Brazilian Institute of Geography and Statistics (IBGE), that comes to about 384 kg per person per year; and 384 kg ÷ 365 days ≈ 1.05 kg per day, the same figure Abrema reports. Of the share sent to final disposal, 40.3% went to open dumps and other inadequate sites, and only 8.7% of the total generated went to recycling.

Weigh your household trash every day at the same time: step on the scale with the bag and without it, write down the difference, and sort it into organic, recyclable, and non-recoverable waste. Wear gloves. Ask your city hall about collection days, whether recyclables are collected separately, and where the trash goes. For comparison, a four-person household at Brazil's national average would generate 4 × 1.05 = 4.2 kg per day; since that average includes street sweeping, use it only as an order of magnitude. In your report, follow the order of priority in Brazil's National Solid Waste Policy (Law No. 12,305/2010, Article 9): non-generation, reduction, reuse, recycling, treatment, and, last of all, environmentally sound final disposal of the waste that cannot be recovered.

For requirement 6, follow the Air Quality Index (IQAr, its Portuguese acronym), which combines six pollutants into a single value: PM10, PM2.5, nitrogen dioxide, sulfur dioxide, carbon monoxide, and ozone, under Resolution No. 506/2024 of Brazil's National Environment Council (Conama). The São Paulo State Environmental Company (Cetesb), the Espírito Santo State Environment Institute (Iema), and other state agencies publish the data. Write down one value per day, always from the same monitoring station, and make a line graph.

To explain the peaks, the Mato Grosso State Health Department describes thermal inversion: a layer of warm air above the cold air near the ground blocks circulation and traps pollutants. It can appear in the dry winter, which is also burning season. Mark the cold, rainy, and smoky days on your graph. For reference, Iema recorded Greater Vitória spending 87.45% of the time in the Good range in June 2026.

Ranges from the 2025 Air Quality Report of Brazil's Ministry of the Environment and Climate Change (MMA), reproduced in Iema's June 2026 bulletin.

✅How do you finish the Ecology Honor without the common mistakes?

For requirement 7, organize the ten actions by scale, from home to city, and keep proof of the four you put into practice. A river and beach cleanup done by your Unit can be one of them.

For requirement 8, the choice of texts is yours. Ellen G. White's writings are in the official collection at egwwritings.org, maintained by the Ellen G. White Estate, which also offers works in Portuguese. Read the context and explain, in your own words, what the passage changes about caring for creation today.

The mistakes that most often delay the signature: starting the month-long requirements the day before, copying ready-made definitions, and turning in the graph without a source or dates. Agree with your club leadership on who will evaluate the work and how the achievement will be recorded. Next come Advanced Ecology (EN-045) and the Master Award in Ecology (ME-013).

At its heart, ecology teaches you to read the variety the psalmist celebrated: "How many are your works, LORD! In wisdom you made them all; the earth is full of your creatures" (Psalm 104:24, NIV). Before you start, check the complete requirements for the Ecology Honor in the catalog and set up a calendar with your instructor.