Palearctic predator invades North American Great Lakes.


:Bythotrephes cederstroemii Schoedler, a predatory freshwater zooplankter (Crustacea: Cladocera), was first found in the Laurentian Great Lakes in December 1984. The first individuals were from Lake Huron, followed in 1985 with records from Lakes Erie and Ontario. By late August, 1986 the species had spread to southern Lake Michigan (43°N). Bythotrephes has not previously been reported from North America, but has been restricted to a northern and central Palearctic distribution. Its dramatic and widespread rise in abundance in Lake Michigan was greatest in offshore regions. Bythotrephes appears to be invading aggressively, but avoiding habitats presently occupied by glacio-marine relict species that became established in deep oligotrophic North American lakes after the Wisconsin glaciation. Because it is a voracious predator its invasion may lead to alterations in the native zooplankton fauna of the Great Lakes. It offers the chance to study how invading plankton species join an existing community. Judging from its persistence and success in deep European lakes, Bythotrephes may now become a permanent member of zooplankton communities in the Nearctic.






Lehman JT




Has Abstract


1987-12-01 00:00:00














  • Within-population variation in localized and integrated responses of Trifolium repens to biotically patchy environments.

    abstract::Genets of Trifolium repens (white clover) were collected from three patches of old permanent pasture dominated by Agrostis capillaris, Holcus lanatus or Lolium perenne. Plants derived from the genets were grown with plants of one grass species present on one side of each T. repens, and a different grass species on the...


    pub_type: 杂志文章


    authors: Turkington R,Hamilton RS,Gliddon C

    更新日期:1991-04-01 00:00:00

  • Pattern of movement in and dispersal from a dutch forest of Carabus problematicus Hbst. (Coleoptera, Carabidae).

    abstract::Data in the literature that in the Netherlands Carabus problematicus is an autumn breeder with overwintering larvae and adults have been confirmed. Pitfall catches show two peaks of adult beetles. The first small peak of activity is realized in May, the significance of which is not yet understood. The second higher pe...


    pub_type: 杂志文章


    authors: Rijnsdorp AD

    更新日期:1980-05-01 00:00:00

  • Metapopulation dynamics over 25 years of a beetle, Osmoderma eremita, inhabiting hollow oaks.

    abstract::Osmoderma eremita is a species of beetle that inhabits hollows in ancient trees, which is a habitat that has decreased significantly during the last century. In southeastern Sweden, we studied the metapopulation dynamics of this beetle over a 25 year period, using capture-mark-recapture. The metapopulation size had be...


    pub_type: 杂志文章


    authors: Lindman L,Larsson MC,Mellbrand K,Svensson GP,Hedin J,Tranberg O,Ranius T

    更新日期:2020-12-01 00:00:00

  • Ontogenetic changes in leaf traits of tropical rainforest trees differing in juvenile light requirement.

    abstract::Relationships between leaf traits and the gap dependence for regeneration, and ontogenetic changes therein, were investigated in juvenile and adult tropical rainforest tree species. The juveniles of the 17 species included in the study were grown in high light, similar to the exposed crowns of the adult trees. The tra...


    pub_type: 杂志文章


    authors: Houter NC,Pons TL

    更新日期:2012-05-01 00:00:00

  • Geographical gradients of stability in European land bird communities.

    abstract::European data from 15 long-term censuses of breeding land bird communities were analysed in order to measure community stability. Stability was here operationally defined as year-to-year persistence of community structure (total density, number of species, diversity, evenness of the species-abundance distribution, spe...


    pub_type: 杂志文章


    authors: Järvinen O

    更新日期:1979-01-01 00:00:00

  • Field metabolic rates and water influxes of two sympatric Gerbillidae:Gerbillus allenbyi andG. pyramidum.

    abstract::Two primarily granivorous rodents of Old World deserts,Gerbillus allenbyi (mean adult body mass=26 g) andG. pyramidum (mean adult body mass=40 g), coexist in sandy habitats in the northwestern Negev desert. Both species are burrow dwellers and are nocturnal; however, in their overall distributions,G. pyramidum occurs ...


    pub_type: 杂志文章


    authors: Degen AA,Pinshow B,Kam M

    更新日期:1992-07-01 00:00:00

  • The effect of light quantity and quality during development on the photosynthetic characteristics of six Australian rainforest tree species.

    abstract::Seedlings of six subtropical rainforest tree species representing early (Omalanthus populifolius, Solanum aviculare), middle (Duboisia myoporoides, Euodia micrococca) and late (Acmena ingens, Argyrodendron actinophyllum) successional stages in forest development were grown in a glasshouse, under four levels of neutral...


    pub_type: 杂志文章


    authors: Turnbull MH

    更新日期:1991-06-01 00:00:00

  • Effect of delayed mating and prolonged engorgement on the reproductive fitness of female Amblyomma limbatum (Acari: Ixodidae) in marginal population areas.

    abstract::Reptile ticks mate while females are attached to their host. Following mating, females engorge, detach and then lay their eggs. This study examines whether the time that females of the reptile tick Amblyomma limbatum spend on hosts prior to mating and the time they take to engorge on hosts after mating influence their...


    pub_type: 杂志文章


    authors: Chilton NB,Andrews RH,Bull CM

    更新日期:1993-05-01 00:00:00

  • Diurnal changes in proline content of desert plants.

    abstract::The diurnal changes in proline and water contents of Zygophyllum quatarense and Francoeuria crispa were investigated under desert conditions. In both plants, the proline content was low before sunrise amounting to 10.42 μmoles/g fresh weight in Zygophyllum and 6.3 μmoles/g fresh weight in Francoeuria. By the progress ...


    pub_type: 杂志文章


    authors: Batanouny KH,Ebeid MM

    更新日期:1981-01-01 00:00:00

  • Ratio-dependent response of a temperate Australian estuarine system to sustained nitrogen loading.

    abstract::Classical resource- and the less studied ratio-dependent models of predator-prey relationships provide divergent predictions as to the sustained ecological effects of bottom-up forcing. While resource-dependent models, which consider only instantaneous prey density in modelling predator responses, predict community re...


    pub_type: 杂志文章


    authors: Bishop MJ,Kelaher BP,Smith MP,York PH,Booth DJ

    更新日期:2006-10-01 00:00:00

  • Delayed density dependence and oscillatory population dynamics in overlapping-generation systems of a seed beetle Callosobruchus chinensis: matrix population model.

    abstract::Long-term experimental systems with overlapping generations using a seed beetle, Callosobruchus chinensis, were maintained by providing 5 g of azuki beans (Vigna angularis) in two different renewal intervals: either 7 days or 10 days. The 7-day-renewal system (system 1) showed oscillatory dynamics with a constant peri...


    pub_type: 杂志文章


    authors: Shimada M,Tuda M

    更新日期:1996-01-01 00:00:00

  • The effect of sex, age, and location on carnivory in Utah black bears (Ursus americanus).

    abstract::Ungulates are important to the diet of bears because they are high in protein, and the level of dietary protein strongly influences bear size. The size a bear obtains as an adult influences important life history characteristics, such as age of reproduction and reproductive success; therefore, it is important to know ...


    pub_type: 杂志文章


    authors: Hatch KA,Kester KA,Auger J,Roeder BL,Bunnell K,Black HL

    更新日期:2019-04-01 00:00:00

  • Plasticity of reproductive components at different stages of development in the annual plant Thlaspi arvense L.

    abstract::This study examines the effect of different densities and the removal of all neighbours at different stages of development on all components of reproduction in the inbreeding annual Thlaspi arvense L. A 64-fold increase in density significantly reduced all repooductive components. The number of flower buds per plant w...


    pub_type: 杂志文章


    authors: Matthies D

    更新日期:1990-05-01 00:00:00

  • Surfactants: their role in preventing the precipitation of proteins by tannins in insect guts.

    abstract::Much more tannic acid or pin oak tannin is required to precipitate the abundant leaf protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), from Manduca sexta gut fluid adjusted to pH 6.5 than is required to precipitate this protein from an aqueous buffer at the same pH. This finding demonstrates that some ...


    pub_type: 杂志文章


    authors: Martin MM,Martin JS

    更新日期:1984-03-01 00:00:00

  • Distribution of carbonic anhydrase in British marine macroalgae.

    abstract::Thirty-four species of marine macroalgae from around St. Andrews, Scotland, have been assayed for their external activity and thirty-three species for their total activity of carbonic anhydrase. Activity was detected in all the Rhodophyta tested apart from Chondrus crispus, but was absent in Codium fragile, Enteromorp...


    pub_type: 杂志文章


    authors: Giordano M,Maberly SC

    更新日期:1989-12-01 00:00:00

  • Dung beetles in an avian-dominated island ecosystem: feeding and trophic ecology.

    abstract::Globally, dung beetles (Scarabaeidae: Scarabaeinae) are linked to many critical ecosystem processes involving the consumption and breakdown of mammal dung. Endemic New Zealand dung beetles (Canthonini) are an anomaly, occurring at high abundance and low diversity on an island archipelago historically lacking terrestri...


    pub_type: 杂志文章


    authors: Stavert JR,Gaskett AC,Scott DJ,Beggs JR

    更新日期:2014-09-01 00:00:00

  • Respiratory patterns and metabolism in tenebrionid and carabid beetles from the Simpson Desert, Australia.

    abstract::The respiratory physiology of four species of Australian desert-dwelling beetle was examined using a flow-through respirometry system over the temperature range of 20-40°C. The two species of tenebrionid beetles (Heleus waitei and Pterohelaeus sp.) did not exhibit the discontinuous gas exchange cycles (DGC), a mechani...


    pub_type: 杂志文章


    authors: Duncan FD,Dickman CR

    更新日期:2001-12-01 00:00:00

  • Testing competing measures of profitability for mobile resources.

    abstract::Optimal diet theory often fails to predict a forager's diet choice when prey are mobile. Because they escape or defend themselves, mobile prey are likely to increase the forager's handling time, thereby decreasing its fitness gain rate. Many animals have been shown to select their prey so as to maximize either their f...


    pub_type: 杂志文章


    authors: Barrette M,Wu GM,Brodeur J,Giraldeau LA,Boivin G

    更新日期:2009-01-01 00:00:00

  • Effects of pond size and consequent predator density on two species of tadpoles.

    abstract::Experimental ponds were used as a model system of habitat patches to study the effect of habitat size on the relative growth performance of tadpoles of Bufo americanus and Pseudacris triseriata, and on colonization by predatory insects. Three pond depths and surface areas were habitat size treatments in a replicated, ...


    pub_type: 杂志文章


    authors: Pearman PB

    更新日期:1995-04-01 00:00:00

  • Leaf isoprene emission as a trait that mediates the growth-defense tradeoff in the face of climate stress.

    abstract::Plant isoprene emissions are known to contribute to abiotic stress tolerance, especially during episodes of high temperature and drought, and during cellular oxidative stress. Recent studies have shown that genetic transformations to add or remove isoprene emissions cause a cascade of cellular modifications that inclu...


    pub_type: 杂志文章


    authors: Monson RK,Weraduwage SM,Rosenkranz M,Schnitzler JP,Sharkey TD

    更新日期:2021-01-08 00:00:00

  • Larval consumption rates, interspecific predation, and local guild composition of egg-overwintering Agabus (Coleoptera, Dytiscidae) species in vernal ponds.

    abstract::In vernal ponds in the boreal region, egg-over-wintering Agabus species form a guild that feeds mainly on larvae and pupae of aedine mosquitoes. The regular co-existence of very similar Agabus species indicates local communities not structured by interspecific competition. However, the lower number of species in local...


    pub_type: 杂志文章


    authors: Nilsson AN,Söderström O

    更新日期:1988-06-01 00:00:00

  • Does nitrogen nutrition restrict the CO2 response of fertile grassland lacking legumes?

    abstract::The extent of the response of plant growth to atmospheric CO2 enrichment depends on the availability of resources other than CO2. An important growth-limiting resource under field conditions is nitrogen (N). N may, therefore, influence the CO2 response of plants. The effect of elevated CO2 (60 Pa) partial pressure (pC...


    pub_type: 杂志文章


    authors: Zanetti S,Hartwig UA,van Kessel C,Lüscher A,Hebeisen T,Frehner M,Fischer BU,Hendrey GR,Blum H,Nösberger J

    更新日期:1997-09-01 00:00:00

  • The significance of ant and plant traits for ant pollination in Leporella fimbriata.

    abstract::Ant metapleural glands secrete surface antibiotics that affect pollen as well as bacteria and fungi. This may be one reason why ant pollination is rare. It is predicted that pollination by ants is possible only in the presence of certain ant and/or plant traits. Two traits are investigated; first, absence of the metap...


    pub_type: 杂志文章


    authors: Peakall R,Angus CJ,Beattie AJ

    更新日期:1990-10-01 00:00:00

  • Coexistence of white-footed mice and deer mice may be mediated by fluctuating environmental conditions.

    abstract::White-footed mice, Peromyscus leucopus noveboracensis, and deer mice, P. maniculatus nubiterrae, occur sympatically throughout much of the Appalachian Mountains of the eastern United States. Previous studies have shown that these two species are behaviorally and ecologically similar and do not partition food or microh...


    pub_type: 杂志文章


    authors: Wolff JO

    更新日期:1996-11-01 00:00:00

  • Long-term inducible resistance in birch foliage: triggering cues and efficacy on a defoliator.

    abstract::Heavy damage of the mountain birch foliage, as well as application of small amounts of insect frass to the soil beneath the trees, reduced growth of Epirrita autumnata larvae reared in these trees in the following year. Foliage damage in the previous year decreased larval survival, too. Both foliage damage and insect ...


    pub_type: 杂志文章


    authors: Haukioja E,Suomela J,Neuvonen S

    更新日期:1985-02-01 00:00:00

  • Hatching date influences age at first reproduction in the black-headed gull.

    abstract::In long-lived colonial birds, age at recruitment is an important life-history character. Variation in this parameter may reflect differences in several factors, including competitive ability and breeding strategies. Further, these differences may be due to timing of hatching (for instance through differences in compet...


    pub_type: 杂志文章


    authors: Prévot-Julliard AC,Pradel R,Julliard R,Grosbois V,Lebreton JD

    更新日期:2001-03-01 00:00:00

  • Spatial heterogeneity of plant-soil feedbacks increases per capita reproductive biomass of species at an establishment disadvantage.

    abstract::Plant-soil feedbacks have been widely implicated as a driver of plant community diversity, and the coexistence prediction generated by a negative plant-soil feedback can be tested using the mutual invasibility criterion: if two populations are able to invade one another, this result is consistent with stable coexisten...


    pub_type: 杂志文章


    authors: Burns JH,Brandt AJ,Murphy JE,Kaczowka AM,Burke DJ

    更新日期:2017-04-01 00:00:00

  • Foraging segregation and genetic divergence between geographically proximate colonies of a highly mobile seabird.

    abstract::Foraging segregation may play an important role in the maintenance of animal diversity, and is a proposed mechanism for promoting genetic divergence within seabird species. However, little information exists regarding its presence among seabird populations. We investigated genetic and foraging divergence between two c...


    pub_type: 杂志文章


    authors: Wiley AE,Welch AJ,Ostrom PH,James HF,Stricker CA,Fleischer RC,Gandhi H,Adams J,Ainley DG,Duvall F,Holmes N,Hu D,Judge S,Penniman J,Swindle KA

    更新日期:2012-01-01 00:00:00

  • The resistance of Pteridium aquilinum (L.) Kuhn to insect attack by Trichoplusia ni (Hübn.).

    abstract::Resistance of Pteridium aquilinum to insect attack was studied by incorporating air dried bracken leaf meal and extracts of bracken leaf meal into an artificial diet for Trichoplusia ni (Lepidoptera: Noctuidae). When larvae are reared on diets containing 6% bracken leaf meal, they do not mature past the second instar ...


    pub_type: 杂志文章


    authors: Hendrix SD

    更新日期:1977-12-01 00:00:00

  • More than just drought: complexity of recruitment patterns in Mediterranean forests.

    abstract::Understanding community dynamics during early life stages of trees is critical for the prediction of future species composition. In Mediterranean forests drought is a major constraint for regeneration, but likely not the only factor determining the observed spatial patterns. We carried out a sowing experiment aimed at...


    pub_type: 杂志文章


    authors: Granda E,Escudero A,Valladares F

    更新日期:2014-12-01 00:00:00