Concepts
94 concepts
animal communication
Mechanisms used by individuals to convey different cues to others, including color, vocal cues, body language, and biofluorescence
case grazing
Behavior where caddisfly larvae consume material from their own or others' protective cases
coarse particulate organic matter
Organic matter particles larger than 1 mm, including intact leaves and larger detrital fragments
diel vertical migration
Daily behavioral pattern where aquatic organisms move vertically in the water column, typically showing different activity levels during day versus night periods
drift phase
electivity index
A measure comparing the proportion of prey in predator diet to proportion in environment to detect selection or avoidance
mass-specific excretion rate
the rate of nutrient excretion per unit body mass of an organism
non-additive effects
Combined impact of multiple predators differs from the sum of their individual effects, can be greater or less than additive
positive feedback loop
Mechanism where state and behavior mutually reinforce each other, measured as positive correlation between individual intercept and slope in random regression models.
principal component analysis
Statistical method used to identify the structuring factors driving life-history variation and to detect slow-fast continuum patterns
sampling efficiency
Measure of how effectively a sampling method captures target organisms relative to processing time and effort
terrestrial subsidies
Input of terrestrial invertebrates into aquatic food webs providing energy to aquatic predators
threshold elemental ratios
The hypothesis that disposing of excess dietary nutrients imposes a growth cost on organisms, creating hump-shaped relationships with diet stoichiometry
EPT taxa
Ephemeroptera, Plecoptera, and Trichoptera orders used as indicators of aquatic ecosystem health
ash-free dry mass
Standard measure of organic biomass determined by ashing samples to remove inorganic material
beaver pond morphology
Physical structure and arrangement of beaver ponds, specifically comparing single isolated ponds versus terraced series of connected ponds
benthic organic matter
Organic material found in pond sediments that serves as nutrient storage compartment
best of a bad lot mechanism
Paedomorphosis becomes the preferred life strategy when growing conditions such as prey abundance, water temperature, and population density are poor, so individuals opt to cut losses and become sexua...
bioaccumulation
The accumulation of substances like sodium in organisms through their food chain, allowing carnivores to obtain adequate salt from prey
biofilm succession
The sequential development of microbial communities on substrates following disturbance
demographic compensation
Population response where decreases in fitness due to other factors are offset by increases in another demographic parameter
depletion sampling
Population estimation method using repeated sampling to remove individuals and estimate total abundance from decline curve
detritivory
Consumption of dead organic matter by organisms, particularly caddisfly larvae feeding on detritus
detritus shredders
Functional guild of macroinvertebrates that break down dead organic material, contributing to nutrient cycling in aquatic ecosystems
diel periodicity
Daily patterns in organism behavior, with some mayfly species showing increased drift activity at night to minimize exposure to visual predators
dietary specialization
Differential prey use based on habitat type, with fairy shrimp comprising majority of diet in temporary ponds
environmental harshness
Degree of environmental stress affecting survival and reproduction, differing between elevational sites
faunal elements
Biogeographic classification of species based on their broader distributional affinities and evolutionary origins
hydro-geomorphological constraints
Physical habitat constraints related to water flow and stream geomorphology that affect oviposition site availability
hydrological regime
Patterns of stream flow including magnitude, timing, and duration of high and low flow periods
intraguild predation
Asymmetric intraguild predation (IGP) between caddisflies where larger, faster-growing species prey on smaller competitors
nutrient spiraling
The downstream transport and repeated cycling of nutrients through uptake and release in stream ecosystems
periphytic algae
Algae growing attached to surfaces such as decomposing plant material
phosphorus uptake
The removal of phosphorus from the water column by organisms for metabolic processes
predation rate
The rate at which predators consume prey, measured as prey mortality per predator per unit time
predator refuge
Habitat structure that provides protection from predation by offering shelter or hiding places
primary productivity
The production of organic compounds by autotrophic organisms, measured here through chlorophyll-a concentration
sexual dimorphism
Differences between sexes in fluorescent patterns, as identified in Plethodon metcalfi
size at emergence
The body size of mayflies when they emerge as adults from aquatic larval stage
snow mosquitoes
Univoltine species which develop from overwintered eggs in pools formed by melting snow water
stoichiometric homeostasis
transmission dynamics
ecosystem function
The roles that invertebrates play in the flow of energy and cycling of nutrients in wetlands