Investigations of indirect relationships in ecology and environmental sciences: a review and the implications for comparative theoretical ecosystem analysis

Krivtsov, Vladimir

doi:10.1016/j.ecolmodel.2003.12.042

Cited by 73 publications

(30 citation statements)

References 80 publications

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“…Direct interactions have been defined as the direct effects of one process on another (Krivtsov 2004) or the effect of one species on another that does not involve a third species (Montoya et al 2006). Indirect interactions have been defined as interaction modifications that only become apparent when multiple species (or multiple environmental influences) are combined (Wootton 2002).…”

Section: Open Pen Access Ccessmentioning

confidence: 99%

Effect of tidal resuspension on benthic–pelagic coupling in an experimental ecosystem study

Porter¹,

Mason²,

Sanford³

2010

Mar. Ecol. Prog. Ser.

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To test the effect of sediment resuspension on the nutrient and ecosystem dynamics we performed a 4 wk experiment in three 1000 l shear-turbulence-resuspension-mesocosm (STURM) resuspension (R) tanks and three 1000 l non-resuspension (NR) tanks. All tanks contained defaunated muddy sediment and brackish estuarine water and had similar water-column turbulence intensities (~1 cm s-1), energy dissipation rates (~0.08 cm 2 s-3), and tidal cycles (4 h mixing-on and 2 h mixing-off). However, while bottom shear velocity (stress) was low in the NR tanks, high instantaneous bottom shear produced resuspension in the R tanks during the mixing-on cycles. Tidal resuspension in the R tanks resulted in concentrations of 120 to 220 mg l-1 total suspended solids when mixing was on, decreasing to between 10 and 20 mg l-1 when mixing was off. Particulate nitrogen, phosphorus, and carbon concentrations, as well as dissolved inorganic nitrogen, nitrate + nitrite, and phosphate levels were higher in the R tanks. Phytoplankton biomass was also higher in the R tanks, though light was limiting. Tidal resuspension affected water-column algal and zooplankton community composition and induced significantly higher concentrations of brown tide Aureococcus anophagefferens. Microphytobenthos biomass was significantly higher in the NR tanks. Dissolved inorganic nitrogen sediment effluxes were similar in both tanks; however, polychaetes and amphipods developed in the NR, but not in the R tank sediments. Tidal resuspension shifted processes from the benthos to the water column. Regular tidal resuspension profoundly affected ecosystem structure and function, often through indirect pathways and linkages. KEY WORDS: Tidal resuspension · Benthic-pelagic coupling · Shear stress · Shear velocity · STURM· Ecosystem Resale or republication not permitted without written consent of the publisher OPEN PEN ACCESS CCESS J J J J J 0 J NR J J J J J 0 J J J J J J J J J J J J J J J 0 0.05 0.1 0.15 0.2 0.25 J J J J J Editorial responsibility: Graham Savidge,

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Section: Open Pen Access Ccessmentioning

confidence: 99%

Effect of tidal resuspension on benthic–pelagic coupling in an experimental ecosystem study

Porter¹,

Mason²,

Sanford³

2010

Mar. Ecol. Prog. Ser.

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“…It should be noted that other types of statistical analysis (in particular, multivariate techniques, e.g., CCA, PCA, factor analysis) may be helpful for describing the patterns of relationships observed in ecosystems (e.g. Krivtsov et al 1999f, 2002aKrivtsov et al 1999f, , 2003aKrivtsov 2004). However, a large number of variables investigated in the present study would limit the suitability of these techniques here.…”

Section: Correlation Analysis Of the Epilimnion Time Seriesmentioning

confidence: 98%

Importance of biological and abiotic factors for geochemical cycling in a freshwater eutrophic lake

Krivtsov

Sigee

2005

Biogeochemistry

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Here we report the results of a comprehensive biogeochemical monitoring of Rostherne Mere in 1998, including changes in dissolved oxygen, organic carbon and nitrogen, nitrate/nitrite, ammonia, Al, Na, S, K, Mg, Ca, Si, Fe, Mn, orthophosphate, particulate N & P, suspended solids, temperature, pH, chlorophyll-a and zooplankton. The results demonstrated the major influence of primary producers on the overall geochemical cycling of N, P and Si, and suggested that the significance of zooplankton might have been previously underestimated. For major anions and cations, however, the influence of biota on lake water concentrations appeared to be negligible, reflecting the fact that these chemicals were present far in excess of plankton requirements. Thus changes in concentrations of Ca, K, Na, Mg and S were rather limited and must have reflected changes in hydrological and meteorological parameters. K, however, demonstrated a transitional pattern, reflecting some influence of biological uptake. During the stratification period, the slow processes of bacterial decomposition in the hypolimnion gradually released chemicals contained in the materials accumulated in the bottom layer, remarkably increasing the concentrations of dissolved compounds of those elements present in amounts comparable with the pool stored in the sedimenting detritus (e.g. orthophosphate P, ammonia N, Si and DOC). The decomposition also resulted in a drop in the redox potential, followed by partial denitrification and chemical release from the sediments. The hypolimnion of the Mere was confirmed to remain at the stage of Mn release, characterised by accumulation of DOC, orthophosphates, ammonia and initial stages of denitrification. High levels of P released from the sediments during the stratification period suggest that the lake's recovery after sewage diversion might be further delayed.

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“…United States has warmed about 2.0 °C in the past 50 years (USGCRP 2009). In Australia mean temperature has risen by 0.82 °C during 1910-2004and much warming observed after 1950(Tularam and Ilahee 2010. Temperature increased by +0.03 °C per year in some places in Africa (Conway et al 2004;Kruger and Shongwe 2004;Malhi and Wright 2004) and six warmest years were observed since 1987 (Taye and Zewdu 2012).…”

Section: Introductionmentioning

confidence: 97%

“…On the other hand, the use of meteorological data in different ecological and environmental models at regional and global scale have increased and becoming important in recent decades (Li et al 2006). Spatial technology like geographic information system (GIS) along with numerical modelling has emerged as powerful tool to assess the environmental condition (Krivtsov 2004;Rahman and Saha 2008;Rahman and Saha 2009;Rahman et al 2014;Rahman et al 2015) and widely used to quantify and analyse the spatial pattern and variability of the environmental components (Boyle et al 1998;Rahman and Saha 2007;). Country like Bangladesh, information about climate change, particularly the warming in temperature is needed to formulate appropriate strategy to manage, adapt and overcome the problem with the changes.…”

Section: Introductionmentioning

confidence: 98%

Spatio-temporal analysis of warming in Bangladesh using recent observed temperature data and GIS

Rahman

Lateh

2015

Clim Dyn

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warming varied significantly and some places warming exit 2.0 °C and reached up to 3.2 °C. The north western, north eastern, southern and south eastern parts of the country are more susceptible to rising temperature. In 2010, mean annual temperature was 0.84 °C warmer than the base period mean. The significant warmest period was spread across the year 1995-2010, with 2010 being the warmest year. Statistically significant warming was began in early 1990's and the years 1990, 1994 and 1997 identified as important abrupt change points of warming. Moreover, a remarkably northward and north eastward warming was identified, denoting the north, north western and north eastern belts of the country are more susceptible to the warming. Praiseworthy of note, Bangladesh is indeed warming strongly and warming pattern is broadly consistent with the existing global warming.

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Investigations of indirect relationships in ecology and environmental sciences: a review and the implications for comparative theoretical ecosystem analysis

Cited by 73 publications

References 80 publications

Effect of tidal resuspension on benthic–pelagic coupling in an experimental ecosystem study

Effect of tidal resuspension on benthic–pelagic coupling in an experimental ecosystem study

Importance of biological and abiotic factors for geochemical cycling in a freshwater eutrophic lake

Spatio-temporal analysis of warming in Bangladesh using recent observed temperature data and GIS

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