Modelling predation: Theoretical criteria and empirical evaluation of functional form equations for predator-prey systems

Malard, Julien; Adamowski, Jan; Nassar, Jessica Bou; Anandaraja, N.; Tuy, Héctor; Melgar‐Quiñonez, Hugo

doi:10.1016/j.ecolmodel.2020.109264

Cited by 7 publications

(7 citation statements)

References 35 publications

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“…Even so, not all phenomenological or statistical approaches are guaranteed to be logically consistent (Arditi & Michalski, 1996; Morozov & Petrovskii, 2013). All models should therefore be tested against criteria beyond fit and parsimony before they are applied, for example in population models (Malard et al ., 2020; Moisset de Espanés et al ., 2020).…”

Section: Discussionmentioning

confidence: 99%

Hidden layers of density dependence in consumer feeding rates

Stouffer

Novák

2021

Ecology Letters

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Functional responses relate a consumer's feeding rates to variation in its abiotic and biotic environment, providing insight into consumer behaviour and fitness, and underpinning population and food‐web dynamics. Despite their broad relevance and long‐standing history, we show here that the types of density dependence found in classic resource‐ and consumer‐dependent functional‐response models equate to strong and often untenable assumptions about the independence of processes underlying feeding rates. We first demonstrate mathematically how to quantify non‐independence between feeding and consumer interference and between feeding on multiple resources. We then analyse two large collections of functional‐response data sets to show that non‐independence is pervasive and borne out in previously hidden forms of density dependence. Our results provide a new lens through which to view variation in consumer feeding rates and disentangle the biological underpinnings of species interactions in multi‐species contexts.

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Section: Discussionmentioning

confidence: 99%

Hidden layers of density dependence in consumer feeding rates

Stouffer

Novák

2021

Ecology Letters

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“…The activity of consumers depends both in reality and in silico upon the realized rate of grazing and thence the abundance of prey and its quality. Most emphasis in consumer models is directed toward prey capture (e.g., Malard et al, 2020). While RHt2 functions are commonly used as a basis for consumer models (Gentleman et al, 2003), this function is prone to describe implausible encounter, and thence feeding, dynamics (Flynn and Mitra, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Here different approaches to describing core facets of consumer models were compared, specifically those used in plankton and fisheries simulations. Feeding in these models is often represented as a rectangular hyperbolic type-2 (RHt2) function of prey abundance (Gentleman et al, 2003;Malard et al, 2020), while empirical studies often make reference to the classic work of Holling (1965) which describes a linear relationship over the initial resource abundance range (hereafter Ht1) before curving over due to limitations at handling (Holling type 2; Ht2). We have previous indicated that care must be taken in deploying RHt2, else it can give rise to impossible rates of prey capture at low prey abundance (Flynn and Mitra, 2016), proposing an alternative satiation controlled encounter based (SCEB) to better conform with expectations.…”

Section: Introductionmentioning

confidence: 99%

Subtle Differences in the Representation of Consumer Dynamics Have Large Effects in Marine Food Web Models

et al. 2021

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Projecting ocean biogeochemistry and fisheries resources under climate change requires confidence in simulation models. Core to such models is the description of consumer dynamics relating prey abundance to capture, digestion efficiency and growth rate. Capture is most commonly described as a linear function of prey encounter or by rectangular hyperbola. Most models also describe consumers as eating machines which “live-to-eat,” where growth (μ) is limited by a maximum grazing rate (Gmax). Real consumers can feed much faster than needed to support their maximum growth rate (μmax); with feeding modulated by satiation, they “eat-to-live.” A set of strategic analyses were conducted of these alternative philosophies of prey consumption dynamics and testing of their effects in the StrathE2E end-to-end marine food web and fisheries model. In an experiment where assimilation efficiencies were decreased by 10%, such as might result from a change in temperature or ocean acidity, the different formulation resulted in up to 100% variation in the change in abundances of food web components, especially in the mid-trophic levels. Our analysis points to a need for re-evaluation of some long-accepted principles in consumer-resource modeling.

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Section: Discussionmentioning

confidence: 99%

Hidden layers of density dependence in consumer feeding rates

Stouffer

Novák

2020

Preprint

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Functional responses relate a consumer's feeding rates to variation in its abiotic and biotic environment, providing insight into consumer behavior and fitness, and underpinning population and food-web dynamics. Despite their broad relevance and long-standing history, we show here that the types of density dependence found in classic resource- and consumer-dependent functional-response models equate to strong and often untenable assumptions about the independence of processes underlying feeding rates. We first demonstrate mathematically how to quantify non-independence between feeding and consumer interference and between feeding on multiple resources. We then analyze two large collections of functional-response datasets to show that non-independence is pervasive and borne out in previously-hidden forms of density dependence. Our results provide a new lens through which to view variation in consumer feeding rates and disentangle the biological underpinnings of species interactions in multi-species contexts.

show abstract

Modelling predation: Theoretical criteria and empirical evaluation of functional form equations for predator-prey systems

Cited by 7 publications

References 35 publications

Hidden layers of density dependence in consumer feeding rates

Hidden layers of density dependence in consumer feeding rates

Subtle Differences in the Representation of Consumer Dynamics Have Large Effects in Marine Food Web Models

Hidden layers of density dependence in consumer feeding rates

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