Seasonal-dynamics

Guides

• Cinara pinea

  Large Pine Aphid

  Cinara pinea, the Large Pine Aphid, is a specialized phloem-feeding insect that colonizes Pinus species, particularly Scots pine (Pinus sylvestris). It exhibits distinctive seasonal population dynamics, with spring peaks driven by host plant amino acid availability, followed by summer declines during drought conditions and partial autumn recoveries after rainfall. The species overwinters as eggs laid on current-year needles, with approximately 50% egg mortality between oviposition and hatching. Winged morphs (alatae) are produced only during June and early July, contingent on both crowding and active host shoot growth.

  aphidpinephloem-feederhoneydew-producerseasonal-dynamicsparthenogenesisforestry-pest

• Gammarus pseudolimnaeus

  Northern Spring Amphipod

  Gammarus pseudolimnaeus is a freshwater amphipod crustacean inhabiting lotic (flowing water) environments in North America. The species exhibits complex behavioral ecology, including size-selective predation vulnerability to fish predators such as brook trout and sculpins, and chemically-mediated responses to predation risk that influence reproductive behavior. Population dynamics are characterized by univoltine (single annual) generation cycles with high mortality during early life stages and winter periods. The species serves as an important prey item in stream food webs and has been extensively studied as a model organism for freshwater invertebrate ecology, toxicology, and predator-prey interactions.

  freshwaterloticamphipodpredator-preybehavioral-ecologytoxicologyunivoltineNorth-Americamodel-organismstream-ecologysize-selective-predationchemical-ecologyparasitismacanthocephalacopper-toxicitymate-guardingcalceolimicrohabitat-selectionthigmotaxisdiel-activityseasonal-dynamicsproduction-ecologydriftbrook-troutsculpinOntarioVirginiaGammaridaecrustaceaninvertebratesenticaudataBousfield-1958Northern-Spring-Amphipod