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Ecological Modelling

International Journal on Ecological Modelling and Systems Ecology

ScienceDirect Publication: Ecological Modelling
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Estimating humpback whale abundance using hierarchical distance sampling
24. August 2017
Publication date: 24 August 2017 Source:Ecological Modelling, Volume 358 Author(s): Heloise J. Pavanato, Leonardo L. Wedekin, Fernando R. Guilherme-Silveira, Márcia H. Engel, Paul G. Kinas We developed a Bayesian distance sampling analysis using a hierarchically structured model parameterization to estimate humpback whale abundance in the Southwest Atlantic Ocean (Breeding Stock A). We included covariates that affect detection (altitude and sighting cue) and occurrence probability (year and distance from shore). Population sizes for 2008, 2011 and 2015 were estimated to be...
Common quandaries and their practical solutions in Bayesian network modeling
24. August 2017
Publication date: 24 August 2017 Source:Ecological Modelling, Volume 358 Author(s): Bruce G. Marcot Use and popularity of Bayesian network (BN) modeling has greatly expanded in recent years, but many common problems remain. Here, I summarize key problems in BN model construction and interpretation, along with suggested practical solutions. Problems in BN model construction include parameterizing probability values, variable definition, complex network structures, latent and confounding variables, outlier expert judgments, variable correlation, model peer review, tests of calibration...
Constraining uncertainty and process-representation in an algal community lake model using high frequency in-lake observations
10. August 2017
Publication date: 10 August 2017 Source:Ecological Modelling, Volume 357 Author(s): Trevor Page, Paul J. Smith, Keith J. Beven, Ian D. Jones, J. Alex Elliott, Stephen C. Maberly, Eleanor B. Mackay, Mitzi De Ville, Heidrun Feuchtmayr Excessive algal blooms, some of which can be toxic, are the most obvious symptoms of nutrient enrichment and can be exacerbated by climate change. They cause numerous ecological problems and also economic costs to water companies. The process-representation of the algal community model PROTECH was tested within the extended Generalised...
An improved Ensemble Kalman Filter for optimizing parameters in a coupled phosphorus model for lowland polders in Lake Taihu Basin, China
10. August 2017
Publication date: 10 August 2017 Source:Ecological Modelling, Volume 357 Author(s): Jiacong Huang, Junfeng Gao Ensemble Kalman Filter (EnKF) is potential in optimizing parameters of an environmental model, but may lead to a worse performance of the model in case that improper parameters were updated. To overcome this weakness, EnKF was improved by coupling with a dynamic and multi-objective sensitivity analysis. The improved EnKF was applied to update the parameters of a coupled phosphorus model for simulating phosphorus dynamics of Polder Jian located in Lake Taihu Basin, China...
Two examples of application of ecological modeling to agricultural production: Extensive livestock farming and overyielding in grassland mixtures
10. August 2017
Publication date: 10 August 2017 Source:Ecological Modelling, Volume 357 Author(s): Hugo Fort, Francisco Dieguez, Virginia Halty, Juan Manuel Soares Lima Livestock production plays an important role in guaranteeing food security worldwide and has an important contribution to the economy of many countries. Precision livestock production (PLP), or the manipulation of livestock activity taking into account the different components of agroecosystems −pastures, cattle and pasture-cattle interactions−, has acquired growing importance in recent years to optimize productivity...
A spatial simulation model to explore the long-term dynamics of podocarp-tawa forest fragments, northern New Zealand
10. August 2017
Publication date: 10 August 2017 Source:Ecological Modelling, Volume 357 Author(s): Narkis S. Morales, George L.W. Perry Understanding the interactive effects of fragmentation and invasive species on forest dynamics requires a long-term perspective because they are difficult to assess in the medium- to long-term using observational or experimental data alone. In such settings ecological models have an important role to play. Here we describe the implementation of a spatially explicit individual-based model (SEIBM) representing the dynamics of small forest fragments in northern New...
Analysis of nitrogen metabolism processes and a description of structure characteristics
10. August 2017
Publication date: 10 August 2017 Source:Ecological Modelling, Volume 357 Author(s): Yan Zhang, Hanjing Lu, Xiaolin Zhang As excessive consumption of food and energy, etc. in cities results in severe nitrogen pollution, this research analyzed the process of nitrogen metabolism in Beijing, calculated total input reactive nitrogen in Beijing from 1995 to 2014 using empirical coefficient method, and further delved into characteristics of consumption structure of food and energy categories, followed by an analysis on the influence of consumption structure change of food and energy...
Validation of a functional-structural tree model using terrestrial Lidar data
10. August 2017
Publication date: 10 August 2017 Source:Ecological Modelling, Volume 357 Author(s): Robert Beyer, Dominik Bayer, Véronique Letort, Hans Pretzsch, Paul-Henry Cournède We compared the spatial output of the functional-structural tree growth model recently presented by Beyer et al. (2017) to empirical tree crowns of European beech (Fagus sylvatica L.) obtained via terrestrial laser scanning. Simulations are found to be morphologically similar to the observed 3D data in terms of size and shape, as well as, quantitatively, contained withing its standard range. We argue that Lidar...
Modeling of natural and social capital on farms: Toward useable integration
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Daniel C. Kenny In a world of increasing population and decreasing availability of arable land, the need to maintain and improve the quality of our farm systems is a clear and pressing one. Considerations of different types of capital give us a more holistic picture of what is at stake. Our decision-making mechanisms and tools must seek to integrate all types of capital, including natural and social capital, if we are to sustain long-term farm performance. Modeling is one way to integrate this...
Hydrological niche segregation of plant functional traits in an individual-based model
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Maximiliane Marion Herberich, Sebastian Gayler, Madhur Anand, Katja Tielbörger Water is one of the major drivers determining distribution and abundance of plant species. Namely, plant species’ presence and location in the landscape can be explained using metrics of soil water because plant species are restricted to a species-specific range of soil water conditions, i.e. their hydrological niche. However, little is known about the specific traits that determine the hydrological niche of a plant...
Comparative study of food webs from two different time periods of Hooghly Matla estuarine system, India through network analysis
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Nabyendu Rakshit, Arnab Banerjee, Joyita Mukherjee, Moitreyee Chakrabarty, Stuart R. Borrett, Santanu Ray Two mass-balanced network models of Hooghly Matla estuarine system, from two different time periods (less exploited phase→1985–1990 and highly exploited phase→1998–2003) have been constructed for quantitative comparison. The models are used to estimate the important biological interactions and relationships among different ecologically important groups. 20 functional groups based...
Marine phytoplankton biomass responses to typhoon events in the South China Sea based on physical-biogeochemical model
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Gang Pan, Fei Chai, DanLing Tang, Dongxiao Wang Most previous studies confirmed that marine phytoplankton biomass can increased dramatically and then formed blooms along the typhoon track after typhoon passage. However, many events of no significant responses to typhoons were neglected. In order to figure out the most important factor for bloom formation, a coupled physical-biogeochemical model was used to study the biogeochemical phytoplankton responses to all 79 typhoon events that affected the...
A modeling approach for a cascade of reservoirs in the Juquiá-Guaçu River (Atlantic Forest, Brazil)
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Marcela B. Cunha-Santino, Ângela T. Fushita, Irineu Bianchini In a cascade of reservoirs, the events that occur in the upstream reservoir can be transferred to the downstream ones. Thus, the water quality of the second and subsequent reservoirs usually changes. Based on a zero-dimensional model, this work describes the mass balances of 23 limnological variables in a system of 6 cascade reservoirs located in a well-preserved hydrographic basin (within the Brazilian Tropical Atlantic Forest...
Simulating individual-based movement in dynamic environments
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Katherine Shepard Watkins, Kenneth A. Rose The accuracy of spatially-explicit individual-based models (IBMs) often depends on the realistic simulation of the movement of organisms, which is especially challenging when movement cues (e.g., environmental conditions; prey and predator abundances) vary in time and space. A number of approaches or sub-models have been developed for simulating movement in IBMs. We evaluated four movement sub-models (restricted-area search, kinesis, event-based, and run and...
Modeling terrestrial ecosystem productivity of an estuarine ecosystem in the Sundarban Biosphere Region, India using seven ecosystem models
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Srikanta Sannigrahi The net primary production (NPP) is a key indicator for assessing the terrestrial carbon pools and fluxes from the atmosphere to biosphere in any given ecosystem. Adequate measurement of the sensitivity and uncertainty of regional and global carbon pools and fluxes in different climatic and anthropogenic regimes is needed to properly investigate the terrestrial carbon balance. Remote sensing light use efficiency (LUE) approaches can be used to quantify the terrestrial NPP accurately...
Integrating age structured and landscape resistance models to disentangle invasion dynamics of a pond-breeding anuran
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Giovanni Vimercati, Cang Hui, Sarah J. Davies, G. John Measey Modelling population dynamics of invasive species may help to propose effective management countermeasures. Invasion dynamics generally show recursive patterns across species and regions, where initial lag is followed by spread and eventual dominance phases. However, timing and modes of these phases are highly variable, emerging from the interplay between traits of the invader and characteristics of the invaded landscape. Disentangling...
An integrated ecohydrological modeling approach to exploring the dynamic interaction between groundwater and phreatophytes
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Xi Li, Yi Zheng, Zan Sun, Yong Tian, Chunmiao Zheng, Jie Liu, Shaomin Liu, Ziwei Xu Phreatophytes play an important role in maintaining the ecological services in arid and semi-arid areas. Characterizing the interaction between groundwater and phreatophytes is critical for the land and water management in such areas but has rarely been attempted via integrated ecohydrological modeling. In this study, a plant growth model was developed and coupled with a soil water dynamics model (Hydrus-1D...
A quantitative synthesis of the movement concepts used within species distribution modelling
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Paul Holloway, Jennifer A. Miller Movement is a ubiquitous ecological process that influences the distribution of all species. In spite of this ecological significance, the incorporation of movement in species distribution models (SDMs) has lagged in comparison with other methodological and conceptual advancements. Many studies still ignore movement processes in applications inherently linked to movement (e.g. tracking changes in climate), and moreover, finer scale movements (e.g. foraging) have been...
Crown plasticity in Scots pine (Pinus sylvestris L.) as a strategy of adaptation to competition and environmental factors
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Jaime Uria-Diez, Arne Pommerening Competition for canopy space is a major ecological process in forest dynamics and some tree species are able to shift their crowns away from competition pressure to improve light capture. As a result canopy structure is an expression of the spatial pattern of resource acquisition. A novel combination of spatial analysis, tessellations and computer simulations of crown movements allowed us to disentangle the main processes that govern crown movements in Pinus sylvestris...
Managing stand density to enhance the adaptability of Scots pine stands to climate change: A modelling approach
24. Juli 2017
Publication date: 24 July 2017 Source:Ecological Modelling, Volume 356 Author(s): Aitor Ameztegui, Antoine Cabon, Miquel De Cáceres, Lluís Coll In the Mediterranean region most climatic forecasts predict longer and more intense drought periods that can affect tree growth and mortality over broad geographic regions. One of the silvicultural treatments that has gained currency to lessen the impacts of climatic change is the reduction of stand density by thinning. However, we lack information on how the response of forest stands to different thinning treatments will be affected...

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