Single-species models for many-species food webs.


:Most species live in species-rich food webs; yet, for a century, most mathematical models for population dynamics have included only one or two species. We ask whether such models are relevant to the real world. Two-species population models of an interacting consumer and resource collapse to one-species dynamics when recruitment to the resource population is unrelated to resource abundance, thereby weakening the coupling between consumer and resource. We predict that, in nature, generalist consumers that feed on many species should similarly show one-species dynamics. We test this prediction using cyclic populations, in which it is easier to infer underlying mechanisms, and which are widespread in nature. Here we show that one-species cycles can be distinguished from consumer resource cycles by their periods. We then analyse a large number of time series from cyclic populations in nature and show that almost all cycling, generalist consumers examined have periods that are consistent with one-species dynamics. Thus generalist consumers indeed behave as if they were one-species populations, and a one-species model is a valid representation for generalist population dynamics in many-species food webs.






Murdoch WW,Kendall BE,Nisbet RM,Briggs CJ,McCauley E,Bolser R





Has Abstract


2002-05-30 00:00:00
















  • The protein Sex-lethal antagonizes the splicing factor U2AF to regulate alternative splicing of transformer pre-mRNA.

    abstract::Somatic sexual differentiation in Drosophila melanogaster involves a cascade of regulated splicing events and provides an attractive model system for the analysis of alternative splicing mechanisms. The protein Sex-lethal (Sxl) activates a female-specific 3' splice site in the first intron of transformer (tra) pre-mRN...


    pub_type: 杂志文章


    authors: Valcárcel J,Singh R,Zamore PD,Green MR

    更新日期:1993-03-11 00:00:00

  • Identification of the BAL-labile factor.

    abstract::One of us has previously reported that treatment of the Keilin and Hartree heart-muscle preparation with 2,3-dimercaptopropanol (BAL), in the presence of air, leads to the complete inactivation of the succinate oxidase system with little if any effect on the activities of succinate dehydrogenase (until more than half ...


    pub_type: 杂志文章


    authors: Slater EC,de Vries S

    更新日期:1980-12-25 00:00:00

  • A mechanism to thin the continental lithosphere at magma-poor margins.

    abstract::Where continental plates break apart, slip along multiple normal faults provides the required space for the Earth's crust to thin and subside. After initial rifting, however, the displacement on normal faults observed at the sea floor seems not to match the inferred extension. Here we show that crustal thinning can be...


    pub_type: 杂志文章


    authors: Lavier LL,Manatschal G

    更新日期:2006-03-16 00:00:00

  • Brain potential and functional MRI evidence for how to handle two languages with one brain.

    abstract::Bilingual individuals need effective mechanisms to prevent interference from one language while processing material in the other. Here we show, using event-related brain potentials and functional magnetic resonance imaging (fMRI), that words from the non-target language are rejected at an early stage before semantic a...


    pub_type: 杂志文章


    authors: Rodriguez-Fornells A,Rotte M,Heinze HJ,Nösselt T,Münte TF

    更新日期:2002-02-28 00:00:00

  • Dynamical age differences among coeval star clusters as revealed by blue stragglers.

    abstract::Globular star clusters that formed at the same cosmic time may have evolved rather differently from the dynamical point of view (because that evolution depends on the internal environment) through a variety of processes that tend progressively to segregate stars more massive than the average towards the cluster centre...


    pub_type: 杂志文章


    authors: Ferraro FR,Lanzoni B,Dalessandro E,Beccari G,Pasquato M,Miocchi P,Rood RT,Sigurdsson S,Sills A,Vesperini E,Mapelli M,Contreras R,Sanna N,Mucciarelli A

    更新日期:2012-12-20 00:00:00

  • Ras-dependent activation of MAP kinase pathway mediated by G-protein beta gamma subunits.

    abstract::Mitogen-activated protein kinases, MAP kinases or ERKs (extracellular signal-regulated kinases) are rapidly stimulated by growth-promoting factors acting on a variety of cell-surface receptors. In turn, ERKs phosphorylate and regulate key intracellular enzymes and transcription factors involved in the control of cellu...


    pub_type: 杂志文章


    authors: Crespo P,Xu N,Simonds WF,Gutkind JS

    更新日期:1994-06-02 00:00:00

  • Density of hydrous silicate melt at the conditions of Earth's deep upper mantle.

    abstract::The chemical evolution of the Earth and the terrestrial planets is largely controlled by the density of silicate melts. If melt density is higher than that of the surrounding solid, incompatible elements dissolved in the melt will be sequestered in the deep mantle. Previous studies on dry (water-free) melts showed tha...


    pub_type: 杂志文章


    authors: Matsukage KN,Jing Z,Karato S

    更新日期:2005-11-24 00:00:00

  • Suppression of insulin feedback enhances the efficacy of PI3K inhibitors.

    abstract::Mutations in PIK3CA, which encodes the p110α subunit of the insulin-activated phosphatidylinositol-3 kinase (PI3K), and loss of function mutations in PTEN, which encodes a phosphatase that degrades the phosphoinositide lipids generated by PI3K, are among the most frequent events in human cancers1,2. However, pharmacol...


    pub_type: 杂志文章


    authors: Hopkins BD,Pauli C,Du X,Wang DG,Li X,Wu D,Amadiume SC,Goncalves MD,Hodakoski C,Lundquist MR,Bareja R,Ma Y,Harris EM,Sboner A,Beltran H,Rubin MA,Mukherjee S,Cantley LC

    更新日期:2018-08-01 00:00:00

  • Structure of serum response factor core bound to DNA.

    abstract::The human serum response factor is a transcription factor belonging to the MADS domain protein family with members characterized from the plant and animal kingdoms. The X-ray crystal structure of the serum response factor core in a specific-recognition DNA complex shows that the functions of DNA binding, dimerization ...


    pub_type: 杂志文章


    authors: Pellegrini L,Tan S,Richmond TJ

    更新日期:1995-08-10 00:00:00

  • Structure and elasticity of microtubule-associated protein tau.

    abstract::Tau is one of the diverse group of microtubule-associated proteins that bind to microtubules and may thereby influence their structure and function. It occurs in the mammalian brain, mainly in axons, and is a component of the neurofibrillary tangles of Alzheimer's disease. Tau was recently sequenced, but there remains...


    pub_type: 杂志文章


    authors: Lichtenberg B,Mandelkow EM,Hagestedt T,Mandelkow E

    更新日期:1988-07-28 00:00:00

  • A distance to the Large Magellanic Cloud that is precise to one per cent.

    abstract::In the era of precision cosmology, it is essential to determine the Hubble constant empirically with an accuracy of one per cent or better1. At present, the uncertainty on this constant is dominated by the uncertainty in the calibration of the Cepheid period-luminosity relationship2,3 (also known as the Leavitt law). ...


    pub_type: 杂志文章


    authors: Pietrzyński G,Graczyk D,Gallenne A,Gieren W,Thompson IB,Pilecki B,Karczmarek P,Górski M,Suchomska K,Taormina M,Zgirski B,Wielgórski P,Kołaczkowski Z,Konorski P,Villanova S,Nardetto N,Kervella P,Bresolin F,Kudritzki RP

    更新日期:2019-03-01 00:00:00

  • cMpl ligand is a humoral regulator of megakaryocytopoiesis.

    abstract::Megakaryocytopoiesis is the cellular developmental process that leads to platelet production. At least two humoral growth factors may be necessary for megakaryocyte proliferation and maturation. One is a megakaryocyte-colony stimulating factor (MK-CSF) which induces the proliferation and differentiation of megakaryocy...


    pub_type: 杂志文章


    authors: Wendling F,Maraskovsky E,Debili N,Florindo C,Teepe M,Titeux M,Methia N,Breton-Gorius J,Cosman D,Vainchenker W

    更新日期:1994-06-16 00:00:00

  • Decline of surface temperature and salinity in the western tropical Pacific Ocean in the Holocene epoch.

    abstract::In the present-day climate, surface water salinities are low in the western tropical Pacific Ocean and increase towards the eastern part of the basin. The salinity of surface waters in the tropical Pacific Ocean is thought to be controlled by a combination of atmospheric convection, precipitation, evaporation and ocea...


    pub_type: 杂志文章


    authors: Stott L,Cannariato K,Thunell R,Haug GH,Koutavas A,Lund S

    更新日期:2004-09-02 00:00:00

  • DARPP-32, a dopamine-regulated neuronal phosphoprotein, is a potent inhibitor of protein phosphatase-1.

    abstract::The neurotransmitter dopamine has been demonstrated by biochemical, histochemical and immunocytochemical techniques to be unevenly distributed in the mammalian central nervous system. DARPP-32 (dopamine- and cyclic-AMP-regulated phosphoprotein of molecular weight 32,000) is a neuronal phosphoprotein that displays a re...


    pub_type: 杂志文章


    authors: Hemmings HC Jr,Greengard P,Tung HY,Cohen P

    更新日期:1984-08-09 00:00:00

  • Enzymatic replication of E. coli chromosomal origin is bidirectional.

    abstract::A soluble enzyme system has been discovered which specifically recognizes and replicates plasmids containing the Escherichia coli chromosomal origin, oriC. Electron microscopy has shown that plasmid replication begins at or near oriC from which it progresses bidirectionally to completion. Control of initiation of a cy...


    pub_type: 杂志文章


    authors: Kaguni JM,Fuller RS,Kornberg A

    更新日期:1982-04-15 00:00:00

  • Molecular insights into human brain evolution.

    abstract::Rapidly advancing knowledge of genome structure and sequence enables new means for the analysis of specific DNA changes associated with the differences between the human brain and that of other mammals. Recent studies implicate evolutionary changes in messenger RNA and protein expression levels, as well as DNA changes...


    pub_type: 杂志文章


    authors: Hill RS,Walsh CA

    更新日期:2005-09-01 00:00:00

  • Tumour lineage shapes BRCA-mediated phenotypes.

    abstract::Mutations in BRCA1 and BRCA2 predispose individuals to certain cancers1-3, and disease-specific screening and preventative strategies have reduced cancer mortality in affected patients4,5. These classical tumour-suppressor genes have tumorigenic effects associated with somatic biallelic inactivation, although haploins...


    pub_type: 杂志文章


    authors: Jonsson P,Bandlamudi C,Cheng ML,Srinivasan P,Chavan SS,Friedman ND,Rosen EY,Richards AL,Bouvier N,Selcuklu SD,Bielski CM,Abida W,Mandelker D,Birsoy O,Zhang L,Zehir A,Donoghue MTA,Baselga J,Offit K,Scher HI,O'Reill

    更新日期:2019-07-01 00:00:00

  • TFIIIC relieves repression of U6 snRNA transcription by chromatin.

    abstract::The U6 small nuclear (sn)RNA gene (SNR6) from the yeast Saccharomyces cerevisiae is transcribed by RNA polymerase III in vivo. This gene is unusual in having a TATA box at position -30, and an essential B-block element located downstream of the T-rich termination signal. The B block is one of the two intragenic promot...


    pub_type: 杂志文章


    authors: Burnol AF,Margottin F,Huet J,Almouzni G,Prioleau MN,Méchali M,Sentenac A

    更新日期:1993-04-01 00:00:00

  • Very mild muscular dystrophy associated with the deletion of 46% of dystrophin.

    abstract::Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD), a much milder form of the disease where the age of onset can sometimes be as late as the third or fourth decade of life, are caused by mutations in the same X-linked gene, a 14 kilobase (kb) transcript which is spread over more than 2 megabases of ...


    pub_type: 杂志文章


    authors: England SB,Nicholson LV,Johnson MA,Forrest SM,Love DR,Zubrzycka-Gaarn EE,Bulman DE,Harris JB,Davies KE

    更新日期:1990-01-11 00:00:00

  • Isolation of a gene regulated by hydrostatic pressure in a deep-sea bacterium.

    abstract::Barophilic bacteria inhabit the deep oceans, and the specific functional modifications and regulatory mechanisms which govern adaptation to hydrostatic pressure are beginning to be understood. For example, the rate of production of several proteins by some hydrothermal vent archaebacteria and the degree of saturation ...


    pub_type: 杂志文章


    authors: Bartlett D,Wright M,Yayanos AA,Silverman M

    更新日期:1989-11-30 00:00:00

  • Small GTP-binding protein associated with Golgi cisternae.

    abstract::Eukaryotic cells seem to use GTP hydrolysis to regulate vesicular traffic in exocytosis and endocytosis. The best evidence for this comes from studies on the yeast Saccharomyces cerevisiae that have identified two small Ras-related GTP-binding proteins, Sec4p and Ypt1p, which control distinct stages of the secretory p...


    pub_type: 杂志文章


    authors: Goud B,Zahraoui A,Tavitian A,Saraste J

    更新日期:1990-06-07 00:00:00

  • The novel Cer-like protein Caronte mediates the establishment of embryonic left-right asymmetry.

    abstract::In the chick embryo, left-right asymmetric patterns of gene expression in the lateral plate mesoderm are initiated by signals located in and around Hensen's node. Here we show that Caronte (Car), a secreted protein encoded by a member of the Cerberus/Dan gene family, mediates the Sonic hedgehog (Shh)-dependent inducti...


    pub_type: 杂志文章


    authors: Rodríguez Esteban C,Capdevila J,Economides AN,Pascual J,Ortiz A,Izpisúa Belmonte JC

    更新日期:1999-09-16 00:00:00

  • Single neurons in prefrontal cortex encode abstract rules.

    abstract::The ability to abstract principles or rules from direct experience allows behaviour to extend beyond specific circumstances to general situations. For example, we learn the 'rules' for restaurant dining from specific experiences and can then apply them in new restaurants. The use of such rules is thought to depend on ...


    pub_type: 杂志文章


    authors: Wallis JD,Anderson KC,Miller EK

    更新日期:2001-06-21 00:00:00

  • Two polyphosphatidylinositide metabolites control two K+ currents in a neuronal cell.

    abstract::Hydrolysis of the membrane phospholipid phosphatidylinositol-4,5-bisphosphate (PtdIns(4,5)P2) produces two prospective intracellular messengers: inositol 1,4,5-trisphosphate (InsP3), which releases Ca2+ from intracellular stores; and diacylglycerol (DG), which activates protein kinase C. Here we show how the formation...


    pub_type: 杂志文章


    authors: Higashida H,Brown DA

    更新日期:1986-09-25 00:00:00

  • Insulin action impaired by deficiency of the G-protein subunit G ialpha2.

    abstract::Integration of information between tyrosine kinase and G-protein-mediated pathways is necessary, but remains poorly understood. Here we use cells from transgenic mice harbouring inducible expression of RNA antisense to the gene encoding G ialpha2 to show that G ialpha2 is critical for insulin action. G ialpha2 deficie...


    pub_type: 杂志文章


    authors: Moxham CM,Malbon CC

    更新日期:1996-02-29 00:00:00

  • Destabilization of beta-catenin by mutations in presenilin-1 potentiates neuronal apoptosis.

    abstract::Mutations of the presenilin-1 gene are a major cause of familial early-onset Alzheimer's disease. Presenilin-1 can associate with members of the catenin family of signalling proteins, but the significance of this association is unknown. Here we show that presenilin-1 forms a complex with beta-catenin in vivo that incr...


    pub_type: 杂志文章


    authors: Zhang Z,Hartmann H,Do VM,Abramowski D,Sturchler-Pierrat C,Staufenbiel M,Sommer B,van de Wetering M,Clevers H,Saftig P,De Strooper B,He X,Yankner BA

    更新日期:1998-10-15 00:00:00

  • Axl receptor tyrosine kinase stimulated by the vitamin K-dependent protein encoded by growth-arrest-specific gene 6.

    abstract::The Axl receptor tyrosine kinase was identified as a protein encoded by a transforming gene from primary human myeloid leukaemia cells by DNA-mediated transformation of NIH 3T3 cells. Axl is the founding member of a family of related receptors that includes Eyk, encoded by a chicken proto-oncogene originally described...


    pub_type: 杂志文章


    authors: Varnum BC,Young C,Elliott G,Garcia A,Bartley TD,Fridell YW,Hunt RW,Trail G,Clogston C,Toso RJ

    更新日期:1995-02-16 00:00:00

  • The reaction cycle of GroEL and GroES in chaperonin-assisted protein folding.

    abstract::The reaction mechanism of protein folding by the chaperonin GroEL and its regulator GroES has been defined. GroES and substrate protein counteract each other's effects on GroEL: whereas GroES stabilizes GroEL in the ADP-bound state, binding of unfolded polypeptide within the cavity of the GroEL cylinder triggers ADP a...


    pub_type: 杂志文章


    authors: Martin J,Mayhew M,Langer T,Hartl FU

    更新日期:1993-11-18 00:00:00

  • Cis-trans isomerization at a proline opens the pore of a neurotransmitter-gated ion channel.

    abstract::5-hydroxytryptamine type 3 (5-HT3) receptors are members of the Cys-loop receptor superfamily. Neurotransmitter binding in these proteins triggers the opening (gating) of an ion channel by means of an as-yet-uncharacterized conformational change. Here we show that a specific proline (Pro 8*), located at the apex of th...


    pub_type: 杂志文章


    authors: Lummis SC,Beene DL,Lee LW,Lester HA,Broadhurst RW,Dougherty DA

    更新日期:2005-11-10 00:00:00

  • Perennial N2 supersaturation in an Antarctic lake.

    abstract::The dry valleys of southern Victoria Land in Antarctica contain several closed basins in which perennially ice-covered lakes are found. One of the most unusual features of these lakes is the occurrence of high O2 concentrations in the water column; values ranging from slightly more than saturation to more than four t...


    pub_type: 杂志文章


    authors: Wharton RA Jr,McKay CP,Mancinelli RL,Simmons GM Jr

    更新日期:1987-01-22 00:00:00