Notiophilus biguttatus

(Fabricius, 1779)

spotted big-eyed beetle, Common springtail stalker

Notiophilus biguttatus is a predatory ground beetle in the Carabidae, native to the Palearctic and introduced to North America. It is a specialized of springtails (Collembola), particularly Orchesella cincta, and exhibits distinctive mass aerial during July in some . The has been extensively studied for its -dependent , food-limited growth, and reproductive costs including accelerated ageing.

Notiophilus biguttatus by (c) Barry Walter, some rights reserved (CC BY), uploaded by Barry Walter. Used under a CC-BY license.

Notiophilus biguttatus01 by wikipedia. Used under a Attribution license.

Pronunciation

How to pronounce Notiophilus biguttatus: //ˌnoʊtiˈɒfɪləs baɪˌɡʌˈteɪtəs//

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Habitat

Pine plantations and agricultural landscapes in northern Europe; also found in mosaic of temporary patches in intensive agroecosystems. Field studies indicate association with habitats supporting abundant .

Distribution

Native to the Palearctic: Europe (including Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Corsica, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Faroe Islands, Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Kaliningrad, Latvia, Liechtenstein, Lithuania, Luxembourg, Moldova, Northern Ireland, North Macedonia, Norway, Poland, Portugal, Russia, Sardinia, Sicily, Slovakia, Slovenia, Spain, Sweden, Switzerland, Netherlands, Ukraine, Yugoslavia). Introduced to North America: Canadian records from Nova Scotia, Newfoundland, New Brunswick, and British Columbia.

Seasonality

activity year-round with -bearing females present throughout the year except late winter/early spring and July. Mass aerial occurs during July.

Diet

Specialized of springtails (Collembola), particularly Orchesella cincta. Prey consumption is -dependent, with mortality of Orchesella cincta increasing significantly with prey density between low and moderate densities.

Life Cycle

Complete with larval and stages. Larval growth rate and adult body size are strongly influenced by temperature and food supply. Adult body size affected by temperature during larval period and more substantially by food availability.

Behavior

Exhibits -dependent search activity: prey traces increase frequency of runs and stops, with effect size dependent on gut contents. Mass aerial documented at high altitude (12–200 m) over agricultural land in July, with millions of individuals passing through 1 km² windows during brief migration periods. Migration by reproductively represents a recent to exploit temporary patches in intensive agroecosystems.

Ecological Role

regulating through -dependent mortality. has stabilizing effect on prey populations through relationship between predator and prey consumption.

Misconceptions

Earlier Dutch studies classified N. biguttatus as poorly dispersing and prone to isolation in natural remnants, contradicting later documentation of mass aerial . This discrepancy likely reflects recent evolutionary of migration in response to agricultural intensification.

More Details

Reproductive physiology

incurs a physiological cost of accelerated ageing; reproductive individuals exhibit reduced longevity compared to non-reproductive individuals. Females bear year-round except late winter/early spring and July. Fat content is low in spring and high from July through autumn. during starvation varies widely and appears related to reproductive status rather than fat content.

Laboratory feeding ecology

Temperature strongly influences larval and feeding rates, consequently affecting growth and oviposition rates. Prey supply affects fat content but not number of ripe in ovaries. Field show significant variation in fat content and body size across pine plantations, with body size ranging between laboratory maximum and minimum values.