Abstract
Disturbances are processes inherently variable in time and space. This variability comprises a key determinant of ecosystem responses to disturbance. Temporal patterns can, however, vary significantly both among and within individual disturbance events. While recent research has demonstrated an importance of the former, studies on the effects of variability within perturbations have consistently confounded temporal variability with other disturbance attributes (e.g. overall intensity or duration). We established a field experiment to test explicitly the hypothesis that the temporal pattern within perturbations can drive ecosystem responses independently of other disturbance traits. We examined the effects of two disturbance regimes comprising sediment pulses of contrasting temporal pattern (constant and temporally variable intensities) on the benthic invertebrate assemblage of a headwater stream. The overall intensity, duration, timing and frequency of the perturbations were, however, identical. Invertebrates drifting during the temporally variable pulses were more abundant and differed in taxonomic and trophic structure than those exposed to constant perturbations. Moreover, whereas temporal patterns of disturbance events had no immediate effect on benthic invertebrate assemblages in situ, assemblages exposed to the constant perturbations took longer to recover from sediment disturbances than those exposed to temporally variable perturbations. Our results demonstrate that variability in the temporal pattern of intensity within individual perturbations can regulate, independently of other disturbance attributes, the extent and type of ecosystem responses to, and recovery from, disturbances. Effective environmental management and policy therefore necessitate the explicit quantification of temporal patterns of intensity both within and among perturbations.
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References
Anderson MJ (2001) A new method for non-parametric multivariate analysis of variance. Aust Ecol 26:32–46
Anderson MJ, Gorley RN (2007) PERMANOVA+ for PRIMER: guide to software and statistical methods, 1st edn. PRIMER-E, Plymouth
Atalah J, Otto SA, Anderson MJ, Costello MJ, Lenz M, Wahl M (2007) Temporal variance of disturbance did not affect diversity and structure of a marine fouling community in north-eastern New Zealand. Mar Biol 157:199–211
Banas D, Masson G, Leglize L, Usseglio-Polatera P, Boyd CE (2008) Assessment of sediment concentration and nutrient loads in effluents drained from extensively managed fishponds in France. Environ Pollut 152:679–685
Bender EA, Case TJ, Gilpin ME (1984) Perturbation experiments in community ecology: theory and practice. Ecology 65:1–13
Benedetti-Cecchi L (2000) Variance in ecological consumer–resource interactions. Nature 407:370–374
Benedetti-Cecchi L (2003) The importance of the variance around the mean effect size of ecological processes. Ecology 84:2335–2346
Benedetti-Cecchi L, Bertocci I, Vaselli S, Maggi E (2006) Temporal variance reverses the impact of high mean intensity of stress in climate change experiments. Ecology 87:2489–2499
Bertocci I, Maggi E, Vaselli S, Benedetti-Cecchi L (2005) Contrasting effects of mean intensity and temporal variation of disturbance on a rocky seashore. Ecology 86:2061–2067
Bray JR, Curtis JT (1957) An ordination of the upland forest communities of Southern Wisconsin. Ecol Monogr 27:326–349
Broekhuizen N, Parkyn S, Miller D (2001) Fine sediment effects on feeding and growth in the invertebrate grazers Potamopyrgus antipodarum (Gastropoda, Hydrobiidae) and Deleatidium sp. (Ephemeroptera, Leptophlebiidae). Hydrobiologia 457:125–132
Bunge J, Fitzpatrick M (1993) Estimating the number of species: a review. J Am Stat Assoc 88:364–373
Butler MJ IV (1989) Community responses to variable predation: field studies with sunfish and freshwater macroinvertebrates. Ecol Monogr 59:311–328
Chapin FS III et al (2000) Consequences of changing biodiversity. Nature 405:234
Clarke KR, Warwick RM (2001) Changes in marine communities: an approach to statistical analysis and interpretation, 1st edn. PRIMER-E, Plymouth
Clesceri LS, Greenberg AE, Eaton AD (1999) Standard methods for the examination of water and wastewater, 20th edn. American Public Health Association/American Water Works Association/Water Environment Federation, Washington, DC
Costanza R, D’Arge R (1997) The value of the world’s ecosystem services and natural capital. Nature 387:253
Crosa G, Castelli E, Gentili G, Espa P (2010) Effects of suspended sediments from reservoir flushing on fish and macroinvertebrates in an alpine stream. Aquat Sci 72:85–95
Culp JM, Wrona FJ, Davies RW (1986) Response of stream benthos and drift to fine sediment deposition versus transport. Can J Zool 64:1345–1351
Culp JM, Wrona FJ, Davies RW (1987) Response of stream benthos and drift to fine sediment deposition versus transport. Can J Zool 64:1345–1351
Diamond JM, Klaine SJ, Butcher JB (2006) Implications of pulsed chemical exposures for aquatic life criteria and wastewater permit limits. Environ Sci Technol 40:5132–5138
Donohue I, García Molinos J (2009) Impacts of increased sediment loads on the ecology of lakes. Biol Rev 84:517–531
Donohue I, Styles D, Coson C, Irvine K (2005) Importance of spatial and temporal patterns for assessment of risk of diffuse nutrient emissions to surface waters. J Hydrol 304:183–192
Elliot JM (2002) Time spent in the drift by downstream dispersing invertebrates in a Lake District stream. Freshw Biol 47:97–106
Fraterrigo JM, Rusak JA (2008) Disturbance-driven changes in the variability of ecological patterns and processes. Ecol Lett 11:756–770
García Molinos J, Donohue I (2009) Differential contribution of concentration and exposure time to sediment dose effects on stream biota. J N Am Benthol Soc 28:110–121
García Molinos J, Donohue I (2010) Interactions among temporal patterns determine the effects of multiple stressors. Ecol Appl 20:1794–1800
Gibbins C, Vericat D, Batalla RJ (2007a) When is stream invertebrate drift catastrophic? The role of hydraulics and sediment transport in initiating drift during flood events. Freshw Biol 52:2369–2384
Gibbins C, Vericat D, Batalla RJ, Gomez CM (2007b) Shaking and moving: low rates of sediment transport trigger mass drift of stream invertebrates. Can J Fish Aquat Sci 64:1–5
Gibbins C, Batalla RJ, Vericat D (2010) Invertebrate drift and benthic exhaustion during disturbance: response of mayflies (Ephemeroptera) to increasing shear stress and river-bed instability. River Res Appl 26:499–511
Glasby TM, Underwood AJ (1996) Sampling to differentiate between pulse and press perturbations. Environ Monit Assess 42:241–252
Gomi T, Kobayashi S, Negishi JN, Imaizumi F (2010) Short-term responses of macroinvertebrate drift following experimental sediment flushing in a Japanese headwater channel. Landsc Ecol Eng 6:257–270
Groffman P et al (2006) Ecological thresholds: the key to successful environmental management or an important concept with no practical application? Ecosystems 9:1–13
Hewitt JE, Norkko J (2007) Incorporating temporal variability of stressors into studies: an example using suspension-feeding bivalves and elevated suspended sediment concentrations. J Exp Mar Biol Ecol 341:131–141
Hurlbert SH (1971) The nonconcept of species diversity: a critique and alternative parameters. Ecology 52:577–586
Imbert JB, Perry JA (2000) Drift and benthic invertebrate responses to stepwise and abrupt increases in non-scouring flow. Hydrobiologia 436:191–208
Irvine JR, Henriques PR (1984) A preliminary investigation on effects of fluctuating flows on invertebrates of the Hawea River, a large regulated river in New Zealand. N Z J Mar Freshw Res 18:283–290
James ABW, Dewson ZS, Death RG (2008) The effect of experimental flow reductions on macroinvertebrate drift in natural and streamside channels. River Res Appl 24:22–35
Klironomos JN et al (2005) Abrupt rise in atmospheric CO2 overestimates community response in a model plant–soil system. Nature 433:621–624
Krishnaswamy J, Bunyan M, Mehta VK, Jain N, Karanth KU (2006) Impact of iron ore mining on suspended sediment response in a tropical catchment in Kudremukh, Western Ghats, India. Forest Ecol Manag 224:187–198
Lake PS (2000) Disturbance, patchiness, and diversity in streams. J N Am Benthol Soc 19:573–592
Lemly AD (1982) Modification of benthic insect communities in polluted streams: combined effects of sedimentation and nutrient enrichment. Hydrobiologia 87:229–245
Levene H (1960) Robust tests for equality of variances. In: Olkin I, Ghurye SG, Hoeffding W, Madow WG, Mann HB (eds) Contributions to probability and statistics: essays in honour of Harold Hotelling. Stanford University Press, Menlo Park, pp 278–292
Lisle TE (1989) Sediment transport and resulting deposition in spawning gravels, north coastal California. Water Resour Res 25:1303–1319
Lubchenco J (1998) Entering the century of the environment: a new social contract for Science. Science 279:491–497
Marshall NA, Bailey PCE (2004) Impact of secondary salinisation on freshwater ecosystems: effects of contrasting, experimental, short-term releases of saline wastewater on marcoinvertebrates in a lowland stream. Mar Freshw Res 55:509–523
Matthaei CD, Weller F, Kelly DW, Townsend CR (2006) Impacts of fine sediment addition to tussock, pasture, dairy and deer farming streams in New Zealand. Freshw Biol 51:2154–2172
Mauchly JW (1940) Significance test for sphericity of a normal n-variate distribution. Ann Math Stat 11:204–209
McArdle BH, Anderson MJ (2001) Fitting multivariate models to community data: a comment on distance-based redundancy analysis. Ecology 82:290–297
McCabe DJ, Gotelli NJ (2000) Effects of disturbance frequency, intensity, and area on assemblages of stream macroinvertebrates. Oecologia 124:270–279
Merritt RW, Cummins KW (1996) An introduction to the aquatic insects of North America, 3rd edn. Kendall/Hunt, Dubuque
Pathikonda S, Ackleh AS, Hasenstein KH, Mopper S (2009) Invasion, disturbance, and competition: modeling the fate of coastal plant populations. Conserv Biol 23:164–173
Peeters E, Brugmans B, Beijer J, Franken R (2006) Effect of silt, water and periphyton quality on survival and growth of the mayfly Heptagenia sulphurea. Aquat Ecol 40:373–380
Pickett STA, White PS (1985) The ecology of natural disturbance and patch dynamics, 1st edn. Academic Press, Orlando
Platt WJ, Connell JH (2003) Natural disturbances and directional replacement of species. Ecol Monogr 73:507–522
Potter TL et al (2006) Combined effects of constant versus variable intensity simulated rainfall and reduced tillage management on cotton pre-emergence herbicide runoff. J Environ Qual 35:1894–1902
Robinson JV, Sandgren CD (1983) The effect of temporal environmental heterogeneity on community structure: a replicated experimental study. Oecologia 57:98–102
Roxburgh SH, Shea K, Wilson JB (2004) The intermediate disturbance hypothesis: patch dynamics and mechanisms of species coexistence. Ecology 85:359–371
Ruane NM, Huisman EA, Komen J (2002) The influence of feeding history on the acute stress response of common carp (Cyprinus carpio). Aquaculture 210:245–257
Sabo JL, Post DM (2008) Quantifying periodic, stochastic, and catastrophic environmental variation. Ecol Monogr 78:19–40
Schwilk DW (2003) Flammability is a niche construction trait: canopy architecture affects fire intensity. Am Nat 162:725–733
Shaw EA, Richardson JS (2001) Direct and indirect effects of sediment pulse duration on stream invertebrate assemblages and rainbow trout (Oncorhynchus mykiss) growth and survival. Can J Fish Aquat Sci 58:2213–2221
Sommer U (2000) Benthic microalgal diversity enhanced by spatial heterogeneity of grazing. Oecologia 122:284–287
Speidel M, Harley CDG, Wonham MJ (2001) Recovery of the brown alga Fucus gardneri following a range of removal intensities. Aquat Bot 71:273–280
Suren AM (2005) Effects of deposited sediment on patch selection by two grazing stream invertebrates. Hydrobiologia 549:205–218
Thomas CD, Cameron A, Green RE, Bakkenes M et al (2004) Extinction risk from climate change. Nature 427:145–148
Vitousek PM, Mooney HA, Lubchenco J, Melillo JM (1997) Human domination of Earth’s ecosystems. Science 277:494–499
Vörösmarty CJ, Sahagian D (2000) Anthropogenic disturbance of the terrestrial water cycle. Bioscience 50:753–765
Waters TF (1995) Sediment in streams: sources, biological effects and control, 1st edn. Mongraph 7. American Fisheries Society, Bethesda
White PS, Jentsch A (2001) The search for generality in studies of disturbance and ecosystem dynamics. Prog Bot 62:399–449
Wood PJ, Armitage PD (1997) Biological effects of fine sediment in the lotic environment. Environ Manage 21:203–217
Zhang DD, Brecke P, Lee HF, He YQ, Zhang J (2007) Global climate change, war, and population decline in recent human history. Proc Natl Acad Sci USA 104:19214–19219
Acknowledgements
This research was funded by a postgraduate award to JGM from Trinity College Dublin and a STRIVE grant from the Irish Environmental Protection Agency (2008-FS-W-7-S5) to ID. We thank Clíona Ní Bhréartúin and the staff of the Kippure State, Peter Stafford, Yukiko Kato, Mark Kavanagh, John O’Brien, Alison Boyce and Vesela Evtimova for their assistance.
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Communicated by Craig Osenberg.
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García Molinos, J., Donohue, I. Temporal variability within disturbance events regulates their effects on natural communities. Oecologia 166, 795–806 (2011). https://doi.org/10.1007/s00442-011-1923-2
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DOI: https://doi.org/10.1007/s00442-011-1923-2