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Goodale E, Magrath RD. Species diversity and interspecific information flow. Biol Rev Camb Philos Soc 2024; 99:999-1014. [PMID: 38279871 DOI: 10.1111/brv.13055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 01/14/2024] [Accepted: 01/15/2024] [Indexed: 01/29/2024]
Abstract
Interspecific information flow is known to affect individual fitness, population dynamics and community assembly, but there has been less study of how species diversity affects information flow and thereby ecosystem functioning and services. We address this question by first examining differences among species in the sensitivity, accuracy, transmissibility, detectability and value of the cues and signals they produce, and in how they receive, store and use information derived from heterospecifics. We then review how interspecific information flow occurs in communities, involving a diversity of species and sensory modes, and how this flow can affect ecosystem-level functions, such as decomposition, seed dispersal or algae removal on coral reefs. We highlight evidence that some keystone species are particularly critical as a source of information used by eavesdroppers, and so have a disproportionate effect on information flow. Such keystone species include community informants producing signals, particularly about predation risk, that influence other species' landscapes of fear, and aggregation initiators creating cues or signals about resources. We suggest that the presence of keystone species means that there will likely be a positive relationship in many communities between species diversity and information through a 'sampling effect', in which larger pools of species are more likely to include the keystone species by chance. We then consider whether the number and relative abundance of species, irrespective of the presence of keystone species, matter to interspecific information flow; on this issue, the theory is less developed, and the evidence scant and indirect. Higher diversity could increase the quantity or quality of information that is used by eavesdroppers because redundancy increases the reliability of information or because the species provide complementary information. Alternatively, there could be a lack of a relationship between species diversity and information if there is widespread information parasitism where users are not sources, or if information sourced from heterospecifics is of lower value than that gained personally or sourced from conspecifics. Recent research suggests that species diversity does have information-modulated community and ecosystem consequences, especially in birds, such as the diversity of species at feeders increasing resource exploitation, or the number of imitated species increasing responses to vocal mimics. A first step for future research includes comprehensive observations of information flow among different taxa and habitats. Then studies should investigate whether species diversity influences the cumulative quality or quantity of information at the community level, and consequently ecosystem-level processes. An applied objective is to conserve species in part for their value as sources of information for other species, including for humans.
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Affiliation(s)
- Eben Goodale
- Department of Health and Environmental Science, Xi'an Jiaotong-Liverpool University, Suzhou, 215123, China
| | - Robert D Magrath
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, ACT, 2600, Australia
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2
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Moncrieff M. Terrorism as Coalitional Predation: Explaining Definitional Ambiguities and Precautionary Responses. EVOLUTIONARY PSYCHOLOGY 2024; 22:14747049241263995. [PMID: 39051590 PMCID: PMC11273568 DOI: 10.1177/14747049241263995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 05/30/2024] [Accepted: 06/09/2024] [Indexed: 07/27/2024] Open
Abstract
Terrorism continues to be an enigmatic and contested concept, lacking a universally accepted definition despite extensive scholarly debate. Lay intuitions, however, demonstrate a notable convergence in identifying acts as "terrorism" when specific situational features are present, such as indiscriminate violence and out-group perpetration. These features elicit predictable and robust precautionary responses, raising the question: Is there a unified and parsimonious explanation for these phenomena? It is hypothesized that a situational template exists in the human mind, the coalitional predation template (CPT), which evolved not to detect modern-day terrorism, per se, but to identify and respond to situations of predatory coalitional conflict. The paper examines the potential cues and mechanisms that constitute the psychological systems activated by such threats, suggesting that matching the input cues of the CPT triggers well-documented precautionary responses to terrorism. However, this cue-based system may not align neatly with contemporary threats, leading to disproportionate responses to some threats while underestimating others. The model also posits that interpretations of violence can vary due to incomplete cues and the social position of the evaluator, leading to public disagreements and inconsistencies in defining terrorism. Consequently, arriving at an unambiguous and widely accepted definition of terrorism may not be possible. The model presented may account for a range of phenomena, including the inclination towards attributing mental illness to particular violent incidents and the uncanny surface similarities between terrorism and war crimes. The findings have significant implications for both the theoretical understanding of terrorism and practical policy responses.
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Affiliation(s)
- Michael Moncrieff
- Department of International Public Law & International Organization, University of Geneva, Geneva, Switzerland
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3
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Smith JE, Carminito C, Hamilton S, Newcomb KL, Randt C, Travenick S. Sensory integration of danger and safety cues may explain the fear of a quiet coyote. Proc Biol Sci 2023; 290:20231812. [PMID: 37876200 PMCID: PMC10598434 DOI: 10.1098/rspb.2023.1812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 09/27/2023] [Indexed: 10/26/2023] Open
Abstract
Sensory integration theory predicts natural selection should favour adaptive responses of animals to multiple forms of information, yet empirical tests of this prediction are rare, particularly in free-living mammals. Studying indirect predator cues offers a salient opportunity to inquire about multimodal risk assessment and its potentially interactive effects on prey responses. Here we exposed California ground squirrels from two study sites (that differ in human and domestic dog activity) to acoustic and/or olfactory predator cues to reveal divergent patterns of signal dominance. Olfactory information most strongly predicted space use within the testing arena. That is, individuals, especially those at the human-impacted site, avoided coyote urine, a danger cue that may communicate the proximity of a coyote. By contrast, subjects allocated less time to risk-sensitive behaviours when exposed to acoustic cues. Specifically, although individuals were consistent in their behavioural responses across trials, 'quiet coyotes' (urine without calls) significantly increased the behavioural reactivity of prey, likely because coyotes rarely vocalize when hunting. More broadly, our findings highlight the need to consider the evolution of integrated fear responses and contribute to an emerging understanding of how animals integrate multiple forms of information to trade off between danger and safety cues in a changing world.
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Affiliation(s)
- Jennifer E. Smith
- Department of Biology, University of Wisconsin Eau Claire, Eau Claire, WI, USA
- Department of Biology, Mills College, 5000 MacArthur Blvd, Oakland, CA 94631, USA
| | - Chelsea Carminito
- Department of Biology, Mills College, 5000 MacArthur Blvd, Oakland, CA 94631, USA
- Department of Biological Sciences, University of Cincinnati, 614 Rieveschl Hall, Cincinnati, OH 45221, USA
| | - Shea Hamilton
- Department of Biology, Mills College, 5000 MacArthur Blvd, Oakland, CA 94631, USA
| | - Kate Lee Newcomb
- Department of Biology, Mills College, 5000 MacArthur Blvd, Oakland, CA 94631, USA
| | - Clare Randt
- Department of Biology, Mills College, 5000 MacArthur Blvd, Oakland, CA 94631, USA
| | - Sarah Travenick
- Department of Biology, Mills College, 5000 MacArthur Blvd, Oakland, CA 94631, USA
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4
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Stamps JA, Luttbeg B. Sensitive Period Diversity: Insights From Evolutionary Models. THE QUARTERLY REVIEW OF BIOLOGY 2022. [DOI: 10.1086/722637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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5
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Corral L, Frink TJ, Fontaine JJ. Is time partitioning the currency of coexistence for a grassland canid community? WILDLIFE BIOLOGY 2022. [DOI: 10.1002/wlb3.01027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lucia Corral
- Nebraska Cooperative Fish and Wildlife Research Unit and School of Natural Resources, Univ. of Nebraska‐Lincoln Lincoln NE USA
| | | | - Joseph J. Fontaine
- Nebraska Cooperative Fish and Wildlife Research Unit and School of Natural Resources, Univ. of Nebraska‐Lincoln Lincoln NE USA
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6
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Uncertainty in foraging success and its consequences on fitness. Behav Processes 2022; 198:104643. [DOI: 10.1016/j.beproc.2022.104643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 03/27/2022] [Accepted: 04/12/2022] [Indexed: 11/22/2022]
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8
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Enhancing the ecological realism of evolutionary mismatch theory. Trends Ecol Evol 2021; 37:233-245. [PMID: 34802715 DOI: 10.1016/j.tree.2021.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 10/15/2021] [Accepted: 10/18/2021] [Indexed: 11/23/2022]
Abstract
Following rapid environmental change, why do some animals thrive, while others struggle? We present an expanded, cue-response framework for predicting variation in behavioral responses to novel situations. We show how signal detection theory can be used when individuals have three behavioral options (approach, avoid, or ignore). Based on this theory, we outline predictions about which animals are more likely to make mistakes around novel conditions (i.e., fall for a trap or fail to use an undervalued resource) and the intensity of that mismatch (i.e., severe versus moderate). Explicitly considering three options provides a more holistic perspective and allows us to distinguish between severe and moderate traps, which could guide management strategies in a changing world.
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MacKay RN, Wood TC, Moore PA. Running away or running to? Do prey make decisions solely based on the landscape of fear or do they also include stimuli from a landscape of safety? J Exp Biol 2021; 224:272127. [PMID: 34515298 DOI: 10.1242/jeb.242687] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 09/02/2021] [Indexed: 12/31/2022]
Abstract
Predator-prey interactions are a key part of ecosystem function, and non-consumptive effects fall under the landscape of fear theory. Under the landscape of fear, the antipredator responses of prey are based on the spatial and temporal distribution of predatory cues in the environment. However, the aversive stimuli (fear) are not the only stimuli prey can utilize when making behavioral decisions. Prey might also be using attractive stimuli that represent safety to guide decision making. Using a novel, orthogonal design, we were able to spatially separate aversive and attractive stimuli to determine whether prey are utilizing safety cues to navigate their environment. Crayfish Faxonius rusticus were placed in the center of a behavioral arena. Aversive stimuli of either predatory bass Micropterus salmoides cues or conspecific alarm cues increased along the x-axis of the behavioral arena. Safety cues (shelters) increased along the y-axis by decreasing the number of shelter openings in this direction. Crayfish were allowed two phases to explore the arena: one without the fearful stimuli and one with the stimuli. Linear mixed models were conducted to determine whether movement behaviors and habitat utilization were affected by the phase of the trial and the type of aversive stimuli. Crayfish responded more strongly to alarm cues than to fear cues, with only alarm cues significantly impacting habitat utilization. When responding to alarm cues, crayfish used safety cues as well as fear cues to relocate themselves within the arena. Based on these results, we argue that crayfish utilize a landscape of safety in conjunction with a landscape of fear when navigating their environment.
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Affiliation(s)
- Rebecca N MacKay
- Laboratory for Sensory Ecology, Department of Biological Sciences, Bowling Green State University, Bowling Green, OH 43403, USA
| | - Tyler C Wood
- Department of Biomedical Sciences, Grand Valley State University, 1 Campus Drive, Allendale, MI 49401, USA
| | - Paul A Moore
- Laboratory for Sensory Ecology, Department of Biological Sciences, Bowling Green State University, Bowling Green, OH 43403, USA
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10
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Feyten LEA, Crane AL, Ramnarine IW, Brown GE. Predation risk shapes the use of conflicting personal risk and social safety information in guppies. Behav Ecol 2021. [DOI: 10.1093/beheco/arab096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Abstract
When faced with uncertainty, animals can benefit from using multiple sources of information in order to make an optimal decision. However, information sources (e.g., social and personal cues) may conflict, while also varying in acquisition cost and reliability. Here, we assessed behavioral decisions of Trinidadian guppies (Poecilia reticulata), in situ, when presented with conflicting social and personal information about predation risk. We positioned foraging arenas within high- and low-predation streams, where guppies were exposed to a personal cue in the form of conspecific alarm cues (a known indicator of risk), a novel cue, or a control. At the same time, a conspecific shoal (a social safety cue) was either present or absent. When social safety was absent, guppies in both populations showed typical avoidance responses towards alarm cues, and high-predation guppies showed their typical avoidance of novel cues (i.e., neophobia). However, the presence of social safety cues was persuasive, overriding the neophobia of high-predation guppies and emboldening low-predation guppies to ignore alarm cues. Our experiment is one of the first to empirically assess the use of safety and risk cues in prey and suggests a threshold level of ambient risk which dictates the use of conflicting social and personal information.
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Affiliation(s)
| | - Adam L Crane
- Department of Biology, Concordia University, West, Montreal, Québec, Canada
| | - Indar W Ramnarine
- Department of Life Sciences, University of the West Indies, St. Augustine, Trinidad and Tobago
| | - Grant E Brown
- Department of Biology, Concordia University, West, Montreal, Québec, Canada
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11
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Chivers DP, McCormick MI, Fakan EP, Edmiston JW, Ferrari MCO. Coral degradation impairs learning of non‐predators by Whitetail damselfish. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | - Mark I. McCormick
- ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences James Cook University Townsville Qld Australia
| | - Eric P. Fakan
- ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences James Cook University Townsville Qld Australia
| | - Jake W. Edmiston
- ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences James Cook University Townsville Qld Australia
| | - Maud C. O. Ferrari
- Department of Biomedical Sciences WCVMUniversity of Saskatchewan Saskatoon SK Canada
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12
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Fraker ME, Ludsin SA, Luttbeg B, Denver RJ. Stress hormone-mediated antipredator morphology improves escape performance in amphibian tadpoles. Sci Rep 2021; 11:4427. [PMID: 33627747 PMCID: PMC7904905 DOI: 10.1038/s41598-021-84052-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Accepted: 01/25/2021] [Indexed: 01/31/2023] Open
Abstract
Complete functional descriptions of the induction sequences of phenotypically plastic traits (perception to physiological regulation to response to outcome) should help us to clarify how plastic responses develop and operate. Ranid tadpoles express several plastic antipredator traits mediated by the stress hormone corticosterone, but how they influence outcomes remains uncertain. We investigated how predator-induced changes in the tail morphology of wood frog (Rana sylvatica) tadpoles influenced their escape performance over a sequence of time points when attacked by larval dragonflies (Anax junius). Tadpoles were raised with no predator exposure, chemical cues of dragonflies added once per day, or constant exposure to caged dragonflies crossed with no exogenous hormone added (vehicle control only), exogenous corticosterone, or metyrapone (a corticosteroid synthesis inhibitor). During predation trials, we detected no differences after four days, but after eight days, tadpoles exposed to larval dragonflies and exogenous corticosterone had developed deeper tail muscles and exhibited improved escape performance compared to controls. Treatment with metyrapone blocked the development of a deeper tail muscle and resulted in no difference in escape success. Our findings further link the predator-induced physiological stress response of ranid tadpoles to the development of an antipredator tail morphology that confers performance benefits.
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Affiliation(s)
- Michael E. Fraker
- grid.261331.40000 0001 2285 7943Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, OH 43212 USA ,grid.214458.e0000000086837370Present Address: Cooperative Institute for Great Lakes Research, School for the Environment and Sustainability, The University of Michigan, Ann Arbor, MI 48109 USA
| | - Stuart A. Ludsin
- grid.261331.40000 0001 2285 7943Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, OH 43212 USA
| | - Barney Luttbeg
- grid.65519.3e0000 0001 0721 7331Department of Integrative Biology, Oklahoma State University, Stillwater, OK 74078 USA
| | - Robert J. Denver
- grid.214458.e0000000086837370Department of Molecular, Cellular, and Developmental Biology and Department of Ecology and Evolutionary Biology, The University of Michigan, Ann Arbor, MI 48109 USA
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13
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Fortuna R, Paquet M, Ferreira AC, Silva LR, Theron F, Doutrelant C, Covas R. Maternal allocation in relation to weather, predation and social factors in a colonial cooperative bird. J Anim Ecol 2021; 90:1122-1133. [PMID: 33550597 DOI: 10.1111/1365-2656.13438] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 01/11/2021] [Indexed: 11/28/2022]
Abstract
Females may adjust prenatal allocation in relation to ecological conditions that affect reproductive success, such as weather conditions or predation risk. In cooperative breeders, helpers might also influence reproductive success, and previous studies suggest that females can lay smaller eggs or larger clutches when breeding with more helpers. Although recent work suggests that helper effects can vary according to climatic variables, how social and ecological factors interact to shape prenatal allocation is poorly understood. Here, we examine how ecological and social components of the breeding environment covary with egg mass and clutch size, using as a model the sociable weaver Philetairus socius, a colonial, cooperatively breeding passerine. The study spanned 9 years and included over 1,900 eggs from over 550 clutches. Our analyses combined natural variation in weather conditions (rainfall before each reproductive event) with a nest predator-exclusion experiment and continuous monitoring of the mother's social environment, allowing us to estimate how individual females adjust allocation to reproduction as their number of helpers varies. We found that egg mass varied consistently within females and did not clearly differ in relation to rainfall or predation risk. Contrary to previous studies, there was no evidence for plastic adjustments as females gained and lost helpers, and egg mass was instead better predicted by mother size and identity. Females laid larger clutches when breeding in environments where predation risk was experimentally reduced and after higher rainfall levels. Yet, there was no evidence for increasing clutch size as the number of helpers increased, nor for an interaction between helper effects and ecological factors. We conclude that while sociable weaver females can vary their clutch size, they show high individual consistency in egg mass. In addition, we found no evidence that females may maximize fitness through plastic prenatal allocation in relation to the number of helpers, or that the presence/absence of helper effects is modulated by rainfall levels or predation risk. These results challenge our current knowledge on some of the possible benefits of breeding with helpers and call for more long-term analyses on reproductive allocation adjustments in other cooperative systems.
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Affiliation(s)
- Rita Fortuna
- CIBIO-InBIO - Research Centre in Biodiversity and Genetic Resources, Vairão, Portugal
| | - Matthieu Paquet
- Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - André C Ferreira
- CIBIO-InBIO - Research Centre in Biodiversity and Genetic Resources, Vairão, Portugal.,CEFE-UMR5175 CNRS - Université de Montpellier, Montpellier Cedex 5, France
| | - Liliana R Silva
- CIBIO-InBIO - Research Centre in Biodiversity and Genetic Resources, Vairão, Portugal
| | - Franck Theron
- CEFE-UMR5175 CNRS - Université de Montpellier, Montpellier Cedex 5, France
| | - Claire Doutrelant
- CEFE-UMR5175 CNRS - Université de Montpellier, Montpellier Cedex 5, France
| | - Rita Covas
- CIBIO-InBIO - Research Centre in Biodiversity and Genetic Resources, Vairão, Portugal.,Percy FitzPatrick Institute, DST-NRF Centre of Excellence, University of Cape Town, Cape Town, South Africa
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14
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The information provided by the absence of cues: insights from Bayesian models of within and transgenerational plasticity. Oecologia 2020; 194:585-596. [PMID: 33128089 DOI: 10.1007/s00442-020-04792-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 10/20/2020] [Indexed: 10/23/2022]
Abstract
Empirical studies of phenotypic plasticity often use an experimental design in which the subjects in experimental treatments are exposed to cues, while the subjects in control treatments are maintained in the absence of those cues. However, researchers have virtually ignored the question of what, if any, information might be provided to subjects by the absence of the cues in control treatments. We apply basic principles of information-updating to several experimental protocols used to study phenotypic plasticity in response to cues from predators to show why the reliability of the information provided by the absence of those cues in a control treatment might vary as a function of the subjects' experiences in the experimental treatment. We then analyze Bayesian models designed to mimic fully factorial experimental studies of trans and within-generational plasticity, in which parents, offspring, both or neither are exposed to cues from predators, and the information-states of the offspring in the different groups are compared at the end of the experiment. The models predict that the pattern of differences in offspring information-state across the four treatment groups will vary among experiments, depending on the reliability of the information provided by the control treatment, and the parent's initial estimate of the value of the state (the parental Prior). We suggest that variation among experiments in the reliability of the information provided by the absence of particular cues in the control treatment may be a general phenomenon, and that Bayesian approaches can be useful in interpreting the results of such experiments.
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Moran NP, Sánchez‐Tójar A, Schielzeth H, Reinhold K. Poor nutritional condition promotes high‐risk behaviours: a systematic review and meta‐analysis. Biol Rev Camb Philos Soc 2020; 96:269-288. [DOI: 10.1111/brv.12655] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 09/09/2020] [Accepted: 09/10/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Nicholas P. Moran
- Evolutionary Biology Bielefeld University Morgenbreede 45 Bielefeld 33615 Germany
- Centre for Ocean Life DTU‐Aqua Technical University of Denmark Building 201, Kemitorvet Kgs. Lyngby 2800 Denmark
| | | | - Holger Schielzeth
- Institute of Ecology and Evolution Friedrich Schiller University Jena Dornburger Straße 159 Jena 07743 Germany
| | - Klaus Reinhold
- Evolutionary Biology Bielefeld University Morgenbreede 45 Bielefeld 33615 Germany
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