Table 2

RIA probabilities of change in benthic populations between reference and treatment stream abundance and biomass [log (x + 1) transformed data] for specific invertebrate taxa (organized by FFG) for mixed substrates after 3 years of litter exclusion (n = 48). Insect orders are as follows: D, Diptera; E, Ephemeroptera; NI, non-insect; O, Odonata; P, Plecoptera; and T, Trichoptera. Diplectrona modesta was the only taxon that increased in the treatment stream relative to the reference stream.

TaxonOrderAbundanceBiomass
Shredder
PeltoperlidaePns
Leuctraspp.P∗∗
Lepidostomaspp.T∗∗∗∗∗∗
Pycnopsychespp.T
Fattigia pele Tnsns
Tipulaspp.Dnsns
Molophilusspp.Dnsns
Lipsothrix sp.Dnsns
Collector-gatherer
NematodaNI
OligochaetaNInsns
CopepodaNI∗∗∗∗∗∗
Paraleptophlebiasp.Ensns
Stenonemaspp.E∗∗∗∗∗∗
Lype diversa Tnsns
Sciaridae (Bradysiasp.)Dnsns
Chironomidae D∗∗∗∗∗
Collector-filterer
Diplectrona modesta T
Parapsyche cardis Tnsns
Predator
Lanthussp.O∗∗∗∗∗∗
Cordulegastersp.O∗∗∗∗
Beloneuriasp.P∗∗
Isoperlaspp.Pnsns
Sweltsa lateralis Pnsns
Rhyacophilaspp.Tns
TanypodinaeD∗∗∗∗∗
CeratopogonidaeD∗∗∗∗∗
Hexatomaspp.D∗∗∗∗
Dicranotaspp.Dnsns
Pediciasp.D∗∗∗∗
  • Probability levels are:

  • * P < 0.05,

  • ** P < 0.01,

  • P < 0.001, and ns, no significant difference between streams.

  • FFG based on gut content analysis.

  • Non-Tanypodinae.