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The impact of environmental fluctuations on structured discrete time population models: resonance, synchrony and threshold behaviour


, : The impact of environmental fluctuations on structured discrete time population models: resonance, synchrony and threshold behaviour. Theoretical Population Biology 68(4): 217-235

External forcing of a discrete time ecological system does not just add variation to existing dynamics but can change the dynamics. We study the mechanisms that can bring this about, focusing on the key concepts of excitation and suppression which emerge when analysing the power spectra of the system in linear approximation. Excitation, through resonance between the system dynamics and the external forcing, is the greater the closer the system is to the boundary of the stability region. This amplification means that the extinction of populations becomes possible sooner than expected and, conversely, invasion can be significantly delayed. Suppression and the consequent redistribution of power within the spectrum proves to be a function both of the connectivity of the network graph of the system and the way that external forcing is applied to the system. It is also established that colour in stochastic forcing can have a major impact, by enhancing resonance and by greater redistribution of power. This can mean a higher risk of extinction through larger fluctuations in population numbers and a higher degree of synchrony between populations. The implications of external forcing for stage-structured species, for populations in competition and for trophic web systems are studied using the tools and concepts developed in the paper.

US$19.90

PMID: 16182329

DOI: 10.1016/j.tpb.2005.06.007


Other references

Zorab, J.S., 1989: The European diploma of anesthesiology and intensive care. Ma Zui Xue Za Zhi 27(2): 177-183

Hudac A.; Odler I.; Majtanova L., 1986: Participation of anaerobic non sporulating bacteria in inflammatory processes of the gallbladder. Bacteriological analysis of smears from the mucosa of removed gallbladders from 50 patients aged 28-70 years with the diagnosis of empyema of the gallbladder revealed that anaerobic non-sporulating bacteria participate as secondary pyogenic and ne...

Llewellyn-Smith, I.J.; Martin, C.L.; Fenwick, N.M.; Dicarlo, S.E.; Lujan, H.L.; Schreihofer, A.M., 2007: VGLUT1 and VGLUT2 innervation in autonomic regions of intact and transected rat spinal cord. Fast excitatory neurotransmission to sympathetic and parasympathetic preganglionic neurons (SPN and PPN) is glutamatergic. To characterize this innervation in spinal autonomic regions, we localized immunoreactivity for vesicular glutamate transpo...

Scalco, F., B.; Otto, P., A.; Brunetti, I., L.; Cruzes, V., M.; Moretti-Ferreira, D., 2006: Smith-Lemli-Opitz syndrome: Clinical and biochemical findings in Brazilian patients. Smith-Lemli-Opitz syndrome (SLOS) or RSH syndrome comprises multiple congenital anomalies and mental retardation. The underlying defect is a deficiency in the activity of Delta(7)-sterol reductase, which decreases cholesterol and increases 7-dehyd...

Chait, A.; Summers, D.; Krasnow, N.; Wechsler, B.M., 1967: Observations on the fate of large pulmonary emboli. Twenty-one patients with angiographic evidence of pulmonary embolism were divided, on the basis of clinical, necropsy and cardiac catheterization findings, into those with and those without coexistent cardiopulmonary disease. The emboli of 7 patie...

Poursafa, P.; Kelishadi, R.; Amini, A.; Amini, A.; Amin, M.Mehdi.; Lahijanzadeh, M.; Modaresi, M., 2011: Association of air pollution and hematologic parameters in children and adolescents. To assess the relationship between air pollution and hematologic parameters in a population-based sample of children and adolescents. This cross-sectional study was conducted in 2009-2010 among school students randomly selected from different area...

Maurer H., 1965: Complications of tracheotomy and laryngectomy and problems in their management abstract from ther umsch 22 7 382 385 1965 human bisolvon expectorant. Drug Digests (9): 17

Robb, N.D.; Crothers, A.J., 1996: Sedation in dentistry. Part 2: Management of the gagging patient. Sedation should be considered as a useful part of the general dental practitioner's armamentarium and as an important alternative to general anaesthesia in selected cases. In this, one of a series of articles on the uses of sedation in variou...

Hartmann, M.; Whitmore, E., 1912: Untereuchungen uber parasitische Amoben. III. Entamoeba coli Losch em. Schaudinn. Archiv fuer Protistenkunde Jena, 24 182-194

Konishi, I., 2013: Cervical cancer treatment: current perspective. Nihon Rinsho. Japanese Journal of Clinical Medicine 70 Suppl 4: 191-193