TYPE III FUNCTIONAL RESPONSE IN<i>DAPHNIA</i>

Sarnelle, Orlando; Wilson, Alan E.

doi:10.1890/07-0935.1

Cited by 108 publications

(120 citation statements)

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“…In the highest spore density treatment, we estimated the density of spores remaining in the beakers following exposure. With these data, we estimated the per parasite consumption rate of Daphnia [25] (see electronic supplementary material, appendix). This per parasite consumption rate represents the volume of environment that is depleted of parasites per unit time (i.e.…”

Section: Methods (A) Epidemiological Modelmentioning

confidence: 99%

Chronic contamination decreases disease spread: aDaphnia–fungus–copper case study

et al. 2012

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Chemical contamination and disease outbreaks have increased in many ecosystems. However, connecting pollution to disease spread remains difficult, in part, because contaminants can simultaneously exert direct and multi-generational effects on several host and parasite traits. To address these challenges, we parametrized a model using a zooplankton-fungus-copper system. In individual-level assays, we considered three sublethal contamination scenarios: no contamination, single-generation contamination (hosts and parasites exposed only during the assays) and multi-generational contamination (hosts and parasites exposed for several generations prior to and during the assays). Contamination boosted transmission by increasing contact of hosts with parasites. However, it diminished parasite reproduction by reducing the size and lifespan of infected hosts. Multi-generational contamination further reduced parasite reproduction. The parametrized model predicted that a single generation of contamination would enhance disease spread (via enhanced transmission), whereas multi-generational contamination would inhibit epidemics relative to unpolluted conditions (through greatly depressed parasite reproduction). In a population-level experiment, multi-generational contamination reduced the size of experimental epidemics but did not affect Daphnia populations without disease. This result highlights the importance of multi-generational effects for disease dynamics. Such integration of models with experiments can provide predictive power for disease problems in contaminated environments.

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Section: Methods (A) Epidemiological Modelmentioning

confidence: 99%

Chronic contamination decreases disease spread: aDaphnia–fungus–copper case study

et al. 2012

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“…As a result, a rather strong opinion in the literature is that implementation of Holling III type in plankton models is biologically meaningless (DeMott 1982;Scheffer and De Boer 1996;Murdoch et al 1998). On the other hand, there are a number of papers claiming exactly the opposite, i.e., that this is Holling type III that we should use in modelling of grazing by herbivorous (Frost, 1975;Chow-Fraser and Srules, 1992;Gismervik and Andersen, 1997;Sarnelle and Wilson, 2008). More surprisingly, the latter statement is sometimes based on revisiting previous laboratory experiments which had demonstrated non-sigmoid response for a given species (e.g.…”

Section: Conventionally There Exist Three Main Types Of Functional Rmentioning

confidence: 99%

“…More surprisingly, the latter statement is sometimes based on revisiting previous laboratory experiments which had demonstrated non-sigmoid response for a given species (e.g. Sarnelle and Wilson, 2008). Thus, the question of adequacy of implementation of Holling type III response in models is far from being solved.…”

Section: Conventionally There Exist Three Main Types Of Functional Rmentioning

confidence: 99%

“…This is especially true for modelling of eutrophic aquatic ecosystems where the choice of type of zooplankton functional response becomes crucial for predicting the outcome of grazing control of algae (Truscott and Brindley, 1994;Hernández-GarcÕa and López, 2004;Fussmann and Blasius, 2005). Implementation of an appropriate type of functional response for herbivorous zooplankton and, in particular, the correctness of the use of Holling type III (a sigmoid-shaped) response has provoked a vivid discussion in the literature (Rothhaupt and Lampert, 1992;Scheffer and De Boer, 1996;Murdoch et al, 1998;Jeschke et al, 2004;Sarnelle and Wilson, 2008). In this paper, I will consider the current problem from a different angle.…”

Section: Introductionmentioning

confidence: 99%

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Emergence of Holling type III zooplankton functional response: Bringing together field evidence and mathematical modelling

Морозов

2010

Journal of Theoretical Biology

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Food-web population models are rather sensitive to parameterization of functional response in predation terms. Theoretical studies would predict enhancing of ecosystems' stability for a functional response of sigmoid type (Holling type III). The choice of a correct type of response is especially important for modelling outcome of grazing control of algal blooms by zooplankton in nutrient-rich ecosystems. Extensive experiments on zooplankton feeding in laboratories show non-sigmoid nature of response for most herbivorous zooplankton species.As a consequence, there is a strong opinion in the literature that the implementation of Holling III type grazing in plankton models is biologically meaningless. I argue, however, that such an 'evident' claim might be wrong and sigmoid functional responses in real plankton communities would emerge more often than it was suggested earlier. Especially, this concerns plankton models without vertical resolution, which ignore heterogeneity in species vertical distribution. By having conducted extensive literature search of data on zooplankton feeding in situ, I show that vertical heterogeneity in food distribution as well as active food searching behaviour of zooplankton can modify the type of functional response. A c c e p t e d m a n u s c r i p t 2In particular, the rate of food intake by the whole zooplankton population in the column, as a function of total amount of food, often exhibits a sigmoid behaviour, instead of a nonsigmoid one postulated previously based upon laboratory experiments. This conceptual discrepancy is due to the ability of zooplankton to feed mostly in layers with high algal density. I propose a generic model explaining the observed alteration of type between the overall and the local functional responses. I show that emergence of Holling type III in plankton systems is due to mechanisms different from those well known in the ecological literature (e.g. food search learning, existence of alternative food, refuge for prey).

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“…Whereas defining the shape of a functional or numerical response in grazing zooplankton has at times generated debate, especially for an ecologically important grazer such as Daphnia (Sarnelle and Wilson 2008), in general the role of algal quality and plasticity in defining variation in these relationships has received little consideration for either the effects of resource-driven changes in nutritional quality or toxicity. To date, examples of toxicity-mediated Type IV or V responses have been particularly rare (Van Gemerden 1974;Freedman and Wolkowicz 1986;Kot 2001) even though toxic algae are both ubiquitous and of substantial environmental concern (Granéli and Turner 2006).…”

mentioning

confidence: 99%

Indirect bottom‐up control of consumer‐resource dynamics: Resource‐driven algal quality alters grazer numerical response

Felpeto

Hairston

2013

Limnology & Oceanography

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The nature of the growth-rate response of grazing zooplankton to algal concentration depends critically upon food quality, which is often a plastic function of environmental conditions. Phytoplankton quality depends upon nutrient and light availability, which together affect cell C : P and C : N, so that the links from external environment to phytoplankton and then to zooplankton can vary in ways that influence consumer-resource interaction strengths, and ultimately, food web structure. We measured the effects of resource-limitation on the population growth rate of rotifers, Brachionus calyciflorus, feeding on the alga Chlamydomonas reinhardtii, and grown in nitrogen-limiting, phosphorus-limiting, or nutrient-sufficient conditions. Consumption of nutrientsufficient algae produced a Type II numerical response with a low half saturation constant (K s ) and high asymptotic growth rate (l max ) consistent with high food quality; P-limited algae also yielded a Type II response but with high K s and low l max , meaning poor food quality. In contrast, N-limited Chlamydomonas resulted in a novel Type IV numerical response in which rotifer growth rate rose to an intermediate l max and then declined at the highest algal densities, suggesting the production of toxic compounds whose negative effect on growth increases as a function of cell density. Experiments with mixed diets confirmed that N-limited food was indeed toxic, whereas P-limited food was simply nutritionally deficient compared with light-limited algae. Additional experiments showed that even the filtrate of N-limited algae can be detrimental to rotifer growth.

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TYPE III FUNCTIONAL RESPONSE INDAPHNIA

Cited by 108 publications

References 60 publications

Chronic contamination decreases disease spread: aDaphnia–fungus–copper case study

Chronic contamination decreases disease spread: aDaphnia–fungus–copper case study

Emergence of Holling type III zooplankton functional response: Bringing together field evidence and mathematical modelling

Indirect bottom‐up control of consumer‐resource dynamics: Resource‐driven algal quality alters grazer numerical response

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