Where does litter collide?

In forest ecology, litter is the layer of dead plant material (fallen leaves, needles, twigs, bark, and fruit) that accumulates on the soil surface and feeds the decomposer system. Olson's 1963 Energy storage and the balance of producers and decomposers in ecological systems modelled the balance between the rate at which litter falls and the rate at which it decays, giving the decomposition constant that still carries his name. The referent is a measurable pool of dead organic matter and its turnover, central to nutrient cycling and soil formation, and it has nothing to do with a set of newborn animals or roadside rubbish beyond the shared image of scattered material.[1]

Unit

Mass of dead plant material per unit area, and its rate of decay

Recovery means

Not applicable

Measured by

Measured with litterfall traps for input and litterbag mass-loss experiments for the decay constant k

In reproductive and life-history biology, a litter is the set of offspring an animal produces in a single birth, and litter size is a core life-history trait that trades off against offspring size and parental investment. Stearns's The evolution of life histories treats how selection tunes the number of young per reproductive bout against the resources each one receives and the parent's future survival. The referent is a count of simultaneously produced young and the evolutionary economics around it, an entirely different thing from decomposing leaves or discarded waste despite sharing the one word.[2]

Unit

The number of offspring produced in a single birth

Recovery means

Not applicable

Measured by

Counted as young per parturition, analysed against offspring size, body size, and survival

In environmental and social science, litter is waste left in public or natural places rather than disposed of properly, and littering is the behaviour that produces it. Cialdini, Reno, and Kallgren's 1990 A focus theory of normative conduct used littering as the test case for how descriptive and injunctive social norms govern whether people drop or keep their trash, while Derraik's 2002 review traced the same discarded material as it accumulates as plastic debris in the marine environment. The referent is misplaced refuse and the conduct behind it, connected to leaf litter only by the shared meaning of scattered cast-off material, and unrelated to a litter of pups.[3][4]

Unit

The amount of improperly discarded waste, or the propensity to litter

Recovery means

Not applicable

Measured by

Assessed by observed littering rates in field experiments and by counts and surveys of accumulated debris