The Animals That Move Nutrients Across Entire Landscapes

Introduction

Across continents and ecosystems, animals move nutrients in ways that reshape soils, waterways, and the productivity of entire landscapes. This article explains how animals—from tiny insects to large mammals and migratory birds—transport elements such as nitrogen, phosphorus, carbon, and minerals, why those movements matter, and what happens when those animal-driven flows change.

What does it mean for animals to move nutrients?

When ecologists say an animal “moves nutrients,” they mean the animal transfers chemical elements or organic material from one place to another in ways that change the availability of those nutrients for plants, microbes, and other animals. Movements can be local (burrowing animals mixing soil) or long-distance (migratory fish carrying marine nutrients into rivers). Nutrient movement includes ingestion, digestion, excretion, carcass deposition, and physical transport of organic matter.

Why animal-mediated nutrient transport matters

Nutrients like nitrogen and phosphorus limit plant growth in many ecosystems. Animals that redistribute these elements can increase productivity, alter plant community composition, influence carbon storage, and affect water quality. In many cases animals act as links between distinct ecosystems — for example, between ocean and forest, lake and shore, or upstream and downstream habitats — creating biogeochemical connections that would not exist without their movements.

Key mechanisms: how animals move nutrients

There are several distinct mechanisms by which animals move nutrients. Understanding these clarifies both ecological function and the consequences of animal population changes.

Consumption and excretion: Animals eat food that contains nutrients; they assimilate some and excrete the rest. Excretion returns nutrients in soluble forms that plants and microbes can use. For example, grazing ungulates concentrate nutrients in dung patches, increasing local soil fertility.

Long-distance migration: Migratory species shuttle nutrients across regions. Salmon transport marine-derived nitrogen and phosphorus upstream when they spawn and die. Migratory birds carry seeds, nitrogen-rich guano, and other materials between breeding and wintering grounds.

Bioturbation and soil mixing: Burrowing animals—earthworms, ants, termites, burrowing mammals—physically move soil and organic matter, altering soil structure and redistributing nutrients vertically and horizontally.

Carcass deposition and foraging scraps: Predators and scavengers leave carcasses and bone fragments that release nutrients as they decompose. A single whale carcass, beached or sunken, provides a concentrated pulse of nutrients to deep-sea or shoreline communities.

Seed and nutrient transport on bodies: Animals can carry seeds, spores, and organic particles on fur, feathers, or exoskeletons, moving carbon and nutrients attached to that material between habitats.

Illustrative examples across ecosystems

Freshwater and anadromous fish: Species like Pacific salmon are born in rivers, feed at sea, then return to spawn. After dying in freshwater, their decaying bodies release marine-derived nutrients that increase stream productivity, supporting insects, plants, and juvenile fish. These nutrient pulses can even influence adjacent riparian forests.

Migratory birds: Shorebirds and waterfowl concentrate nutrients where they roost and feed. In some wetlands and islands, large numbers of birds produce substantial quantities of nitrogen and phosphorus in guano, which boosts plant growth and affects community composition.

Large herbivores: Wildebeest migrations in East Africa and caribou migrations in the Arctic move biomass and nutrients across hundreds of kilometers. Grazing and trampling alter plant communities and soil nutrient distribution; dung and urine create nutrient hotspots that influence plant regrowth.

Predators and scavengers: Wolves, big cats, and vultures concentrate nutrients by leaving prey remains in particular locations. These nutrient hotspots support scavenger guilds and localized plant growth. In marine systems, predators that bring prey to shore can similarly enrich coastal soils.

Soil engineers: Earthworms and termites break down organic matter and redistribute it through the soil profile. Termite mounds often concentrate nutrients and affect plant distribution by creating fertile patches in otherwise poor soils.

Large marine animals: Whales and other large marine vertebrates contribute to a “whale pump”: by feeding at depth and defecating near the surface, they recycle nutrients that stimulate phytoplankton growth, with implications for carbon cycling and fisheries productivity.

Scale and persistence: local hotspots to landscape-level flows

Some animal-driven nutrient effects are very local but intense—dung patches, termite mounds, or carcass sites—creating small “hotspots” of fertility. Other effects are diffuse but widespread, such as the slow redistribution of soil nutrients by earthworms across fields.

Landscape-scale flows occur when animals move regularly over long distances or when many individuals act together. For example, mass migrations transport large amounts of biomass seasonally, and widespread burrowing animals can cumulatively alter soil nutrient distribution across entire grasslands.

Ecological consequences and feedbacks

By redistributing nutrients, animals influence plant productivity, species composition, and trophic interactions. Increased nutrient availability can favor fast-growing plant species, potentially reducing biodiversity if slower-growing species are outcompeted.

Animals also create feedback loops. Nutrient-rich patches can attract herbivores, which further concentrate nutrients through grazing and waste. Conversely, declines in nutrient-transporting animals can reduce soil fertility, alter plant communities, and lower ecosystem resilience.

Human impacts and the loss of nutrient transport

Human activities have changed animal populations and movement patterns, often diminishing their role in nutrient transport. Overfishing reduces marine-to-freshwater nutrient transfers made by anadromous fish. Hunting and habitat fragmentation can stop migrations, severing links between ecosystems. Pesticides and land conversion reduce insect and soil-engineer abundance, weakening soil mixing and organic matter breakdown.

The loss of these flows can cascade: reduced nutrient inputs lower primary productivity, which affects food webs and ecosystem services such as forage production, water purification, and carbon sequestration. Restoring or mimicking animal-driven nutrient flows is sometimes part of conservation and land-management strategies.

Management, restoration, and practical applications

Conservationists and land managers sometimes work to preserve or restore animal-mediated nutrient flows because of their ecological benefits. Protecting migration corridors maintains long-distance nutrient transport. Reintroducing species—such as beavers that create wetland habitats, or herbivores that maintain grassland dynamics—can reestablish nutrient cycling patterns.

In agricultural settings, recognizing the role of animals can inform sustainable practices: conservation buffers to support migratory birds, maintaining pollinators and soil fauna for nutrient cycling, and avoiding practices that remove all large herbivores or predators where they play important roles in nutrient redistribution.

Notable distinctions and limits of animal-driven nutrient transport

Not all nutrient movement is equally important everywhere. In some nutrient-rich ecosystems, animal transfers are less limiting than in nutrient-poor systems. The effectiveness of animal transport depends on species abundance, movement patterns, diet, and the physical landscape (rivers and mountains create barriers or pathways).

Animal-mediated transfers typically interact with abiotic processes—wind, water flow, and geology. For example, river transport of sediments often moves more phosphorus than animal vectors in some systems, while in isolated islands or closed basins animal inputs may be disproportionately important.

Research methods: how scientists study these transfers

Ecologists use several methods to quantify animal-driven nutrient movement. Stable isotope analysis can trace nutrient origins—distinguishing marine from terrestrial nitrogen, for instance. Tracking technologies (GPS, tags) reveal movement patterns, and field experiments (exclusion plots, carcass additions) test ecological responses to nutrient inputs. Combining these approaches builds a clearer picture of the role particular species play.

Examples of surprising or outsized effects

Whale carcasses (or whale falls) host unique deep-sea communities and concentrate nutrients in otherwise nutrient-poor depths. Beavers transform streams into wetlands, changing nutrient cycling, sedimentation, and plant communities across wide areas. Introduced species, such as invasive earthworms in some northern forests, can dramatically alter soil nutrient dynamics where native soil fauna were absent.

Implications for biodiversity and ecosystem services

Animal-mediated nutrient flows support biodiversity by creating habitat heterogeneity and resource pulses. These processes underpin services humans value: productive fisheries, fertile soils for grazing and crops, clean water through healthy wetlands, and carbon storage. Protecting the species and behaviors that move nutrients can therefore support both biodiversity and human well-being.

Open questions and future directions

Scientists continue to investigate how climate change, land use change, and species declines will alter nutrient transport networks. Questions include how shifting migration timing affects nutrient seasonality, how reduced animal sizes or numbers scale down nutrient flows, and how rewilding or species reintroductions can restore lost functions. Improved tracking and biochemical tools are expanding our understanding.

Conclusion

Animals are active engineers of nutrient cycling: they shuttle nitrogen, phosphorus, carbon, and other materials across spatial and ecological boundaries. From earthworms turning soil to migratory fish and birds connecting distant ecosystems, these movements shape productivity, biodiversity, and ecosystem services. Protecting the animals and movement pathways responsible for these transfers helps sustain healthy, resilient landscapes.