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31 results for “induced defence”
Food quantity and quality modulates inducible defences in a common predator-prey system
<p><span>Zooplankton display different inducible defences against invertebrate and vertebrate predators. The response pattern to gape-limited invertebrate predators involves increased somatic growth and offspring body size but delayed maturity and reduced offspring numbers. In contrast to this general pattern, the freshwater model organism <em>Daphnia magna</em> has been reported to exhibit a different response when encountering the gape-limited tadpole shrimp <em>Triops cancriformis</em>. Under laboratory conditions, <em>D. magna</em> showed increased somatic growth, earlier maturation, and an increase in both offspring number and size. We propose here that the discrepancy between the previously observed and the theory-based response patterns against invertebrate predators is due to differences in food availability in the applied laboratory settings and assessed whether the defensive response of <em>D. magna</em> against <em>T. cancriformis</em> is modulated differently by food quantity and quality. We found a strong impact of food quantity and quality on the defence response of <em>D. magna</em> to <em>T. cancriformis</em> kairomones. The prey seem to be able to overcome trade-offs between morphological defence traits and reproductive traits, but distinctly between high food quantity and high food quality. Thereby, reproductive traits were preferred over morphological defences. Furthermore, removal of particles from the <em>T. cancriformis</em>-conditioned water caused a defence pattern in <em>D. magna</em> that was consistent with the general response pattern known from other invertebrate predators, thus explaining the described discrepancy to previous studies with <em>T. cancriformis</em>. <span> </span>Our study highlights the importance of assessing food-related effects on predator-prey interactions to understand trophic relationships and food web processes.</span></p>
Figure 1 in An investigation of predator-induced defence responses in ciliated protozoa
Figure 1. Effect of different predators on Euplotes muscorum. Results are means of three independent replicates for each treatment; ''eaten'', E. muscorum cells ingested by predators; ''cysts'', encysted E. muscorum cells; ''alive'', uningested, trophic E. muscorum cells.
Figure 2 in An investigation of predator-induced defence responses in ciliated protozoa
Figure 2. Prey width distributions of Colpidium kleini from the experiment described in Table II, i.e. (a) in the absence of predators; (b) in the presence of Euplotes sp. Each distribution was calculated after 24 h and represents the mean of three replicates (n5150).
Short-term resistance that persists: Rapidly induced silicon anti-herbivore defence affects carbon-based plant defences
<p><b>1. </b>Silicon (Si) is known to alleviate diverse biotic and abiotic stresses including insect herbivory.<b> </b>Si accumulation in plants, notably the Poaceae, can be induced through stimulation of the jasmonic acid (JA) pathway (associated with chewing herbivores). Nevertheless, the temporal dynamics of Si accumulation as a defence response and its consequential effects on carbon-based defences (e.g. phenolics), particularly in the short-term, remain unclear.</p> <p><b>2. </b>The model grass <i>Brachypodium distachyon</i> was grown in a hydroponic solution where half the plants were supplemented with 2 mM potassium silicate and half had no Si supplied. Plants were treated with methyl jasmonate (MeJA) as a form of standardised simulated herbivory. We measured Si accumulation, the phytohormones JA and salicylic acid (SA), and carbon-based defences over 24 hours to determine the temporal dynamics of Si accumulation and the interplay between Si, simulated herbivory and plant defence machinery.</p> <p><b>3. </b>MeJA-induced Si accumulation occurred as early as 6 hours after treatment via increased JA concentrations. Si supplementation decreased SA concentrations, which could have implications on additional downstream defences. We show a trade-off between Si and phenolics in untreated plants, but this relationship was weakened upon MeJA treatment. Further, this trade-off did not apply to phenolic precursor compounds such as phenylalanine.</p> <p><span><b>4. </b>We provide evidence for rapidly induced Si accumulation associated with herbivory, and that increased Si accumulation impacts on phytohormones and carbon-based defences over a 24-hour period. Additionally, herbivory modifies the relationship between Si- and carbon-based defences. Thus, in addition to its well-documented role as a long-term defence against herbivores, we demonstrate that, over short-term temporal scales, Si accumulation responds to herbivore signals and impacts on plant defence machinery. </span></p>
Data from: Context-dependent defences in turtle ants: resource defensibility and threat level induce dynamic shifts in soldier deployment
1. Induced defences involve the dynamic deployment of limited and specialized defensive resources across multiple locations, to maximize organismal defensive function and fitness. They have been studied intensively in plants and solitary animals, but the induced defences of complex animal societies are poorly understood by comparison, despite the coordinated defensive actions of these taxa. 2. Here, we ask whether the level of environmental danger induces shifts in the deployment of limited and morphologically specialized soldiers across multiple nests in colonies of the turtle ant Cephalotes rohweri. Specifically, we test whether less defensible nests induce greater soldier deployment, and whether elevated enemy threat induced further increases in deployment, or reduced deployment consistent with a risk-limiting strategy. 3. We used colony-collection data to provide natural ecological context to our experiments, a field experiment to address how nest-entrance defensibility and soldier number impact defensive performance, and laboratory experiments to test whether differences in nest defensibility and threat level induce dynamic shifts in soldier deployment to new nests. 4. Less defensible nests were lost rapidly in our field experiment, irrespective of soldier number, but soldier deployment significantly increased survivorship of more defensible nests. Concordantly, less defensible nests induced the deployment of more soldiers per nest under low threat in laboratory experiments. Nevertheless, high-threat conditions revealed a risk-limiting soldier deployment strategy: with more danger, the number of soldiers per nest was significantly reduced in less defensible nests, as was the overall number of new soldier-defended nests. Total deployment to new nests was also consistently lower under high threat, dropping from 40% to 30% across colonies. 5. Induced soldier-based defences in turtle ants are therefore context-dependent, and dynamically scaled back at multiple levels when the environment is more dangerous. This dynamic, risk-limiting strategy is in strong contrast to stable patterns of soldier production in ants, and to typical task-allocation dynamics in members of the worker caste. Moreover, these findings establish that the evolution of specialized defensive agents can be coupled with sophisticated and inducible deployment strategies in complex social taxa, as we see for organisms at other levels of biological complexity.
Data for "Meta-analysis of induced anti-herbivore defence traits in plants from 647 manipulative experiments with natural and simulated herbivory"
<p>Data used in analysis in "Meta-analysis of induced anti-herbivore defence traits in plants from 647 manipulative experiments with natural and simulated herbivory" in Journal of Ecology. </p> <p>Code used for analysis are included as Supplementary Material of the main article. </p> <p> </p>
Data from: predator-induced defences under tropicalisation: a biogeographic approach
<p>Aim: The biogeography of predator-induced defences is an understudied area of predator-prey dynamics. Range overlap with predators that induce the response and local demographics (e.g., prey abundances) are likely to be important factors for determining the biogeographic distribution of induced defences within species. However, with climate warming, range expanding warm-water predators are increasingly preying upon temperate species. This is a consequence of a wider phenomenon known as tropicalisation. We aim to determine: (i) if individuals of a temperate barnacle with induced defences ("bent morphs") are primarily present where they co-occur with range-expanding warm-water predators (muricid snails) and, (ii) if bent morphs are size-structured within populations.</p> <p>Location: North-eastern Pacific rocky intertidal zone (~26-40ºN)</p> <p>Taxon: <em>Tetraclita rubescens</em> (Nilsson-Cantell, 1931), Balanomorpha</p> <p>Methods: We use photo quadrats from sites across the range of <em>T. rubescens</em> to determine the biogeographic distribution of populations with bent morphs and to assess size-structure. We use a combination of field surveys, literature, and museum occurrences to assess range overlap between cool and warm-water predators of <em>T. rubescens</em> and their association with populations with bent morphs and abundance patterns of <em>T. rubescens</em>.</p> <p>Results: Bent morphs are commonly found within the equatorward portion of the species' range (where abundances are highest), in populations overlapping with range expanding warm-water predators. Bent morphs primarily occur within the smaller size classes.</p> <p>Main conclusions: To be partly resilient to the effects of tropicalisation, temperate prey must acclimatize/adapt to altered predator-prey dynamics. Predator-induced defences are one way to do this. We show that bent morphs within a temperate prey species (<em>T. rubescens</em>) are largely restricted to populations that overlap with large-bodied and range-expanding warm-water predators. This is evidence for the partial resilience of <em>T. rubescens</em> to tropicalisation and provides the rationale for further exploration of the eco-evolutionary consequences of tropicalisation in this study system and others.</p>
Data from: Oviposition-induced plant volatiles prime defences against impending herbivores in neighbouring non-damaged plants
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Data from: Context-dependent defences in turtle ants: resource defensibility and threat level induce dynamic shifts in soldier deployment
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Data from: predator-induced defences under tropicalisation: a biogeographic approach
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Short-term resistance that persists: Rapidly induced silicon anti-herbivore defence affects carbon-based plant defences
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Data from: The simultaneous inducibility of phytochemicals related to plant direct and indirect defences against herbivores is stronger at low elevation
Ecological theory indicates that warmer and more stable climates should result in stronger biotic interactions. Therefore, plant species growing at lower elevations and experiencing greater herbivore pressure, should invest in higher levels of defences than those at higher elevations. Nonetheless, there are a number of studies that have found no effect of elevational gradients on plant defensive traits. Several factors might explain the lack of consistency for the altitude-defence relationships; including 1) the reduction of all defensive traits into one measure of resistance; 2) not considering plant defence as the simultaneous expression of several defensive traits; and 3) not considering the relative influence of biotic (e.g. herbivory) and abiotic (e.g. climate and soil conditions) factors associated with the ecological gradient. Here, we present a comprehensive test of the effects of elevation and its associated biotic and abiotic factors on the individual and simultaneous expression of constitutive direct and indirect defences and their inducibility (i.e. expression of defences after herbivore attack). Specifically, we estimated climatic and soil variables and measured herbivore damage and constitutive and jasmonic acid-induced glucosinolate levels in the leaves as a proxy for direct defences, and volatile emission as a proxy for indirect defences in 16 Cardamine species naturally growing along the steep elevational gradient of the Alps. Within a phylogenetic comparative framework, we found that species growing at lower elevations invested more in the simultaneous inducibility of both direct and indirect defences, whereas species growing at higher elevations invested more in constitutive direct defences. Although we found strong elevation gradients in herbivory and climatic and soil variables, these biotic and abiotic factors only partially explained elevational patterns in plant defences. Synthesis - These results highlight that the complex regulation of multiple defence traits strongly vary across elevational gradients and build towards a better understanding of the multiple mechanisms underlying trait evolution and species interactions along ecological gradients.
Data from: Induced defences alter the strength and direction of natural selection on reproductive traits in common milkweed
Evolutionary biologists have long sought to understand the ecological processes that generate plant reproductive diversity. Recent evidence indicates that constitutive antiherbivore defences can alter natural selection on reproductive traits, but it is unclear whether induced defences will have the same effect and whether reduced foliar damage in defended plants is the cause of this pattern. In a factorial field experiment using common milkweed, Asclepias syriaca L., we induced plant defences using jasmonic acid (JA) and imposed foliar damage using scissors. We found that JA-induced plants experienced selection for more inflorescences that were smaller in size (fewer flowers), whereas control plants only experienced a trend towards selection for larger inflorescences (more flowers); all effects were independent of foliar damage. Our results demonstrate that induced defences can alter both the strength and direction of selection on reproductive traits, and suggest that antiherbivore defences may promote the evolution of plant reproductive diversity.
Data from: Defence versus defence: are crucian carp trading off immune function against predator-induced morphology?
1. Numerous species adopt inducible defence strategies, i.e. they have phenotypically plastic traits that decrease the risk of capture and consumption by potential predators. The benefits of expressing alternative phenotypes in high- versus low-risk environments are well documented. However, inducible anti-predator traits are also expected to incur costs, as they are not expressed when predators are absent, yet empirical evidence of such costs remains scarce. 2. Virtually all animals in nature are simultaneously under strong selection to evade both capture by predators and infection by parasites or pathogens, and, hence, display a diverse arsenal of defences to combat these threats, raising the possibility of trade-offs between defences. A classic example of a predator-induced morphological defence is the deep-bodied shape of crucian carp that reduces risk of predation from gape-size limited predators. The goal of this study was to examine if predator exposure affects also immune function in crucian carp, and if the degree of expressed morphological defence is traded off against immune function in individuals. 3. Following exposure to manipulations of perceived risk (predator presence/absence) in a long-term experiment (eight months), key aspects of innate immune function and individual differences in the expression of inducible morphological defence were quantified. 4. Predator-exposed individuals showed lower haptoglobin levels and complement activity, but higher natural antibody titres than fish from predator-free conditions. When experimentally challenged with a mimicked bacterial infection (LPS injection), fish reared in the presence of a natural predator showed a weaker immune response. Moreover, among predator-exposed individuals, the magnitude of morphological defence expression correlated with both baseline immune function and the ability to mount an immune response. However, these relationships were not consistently supportive of a general trade-off among defences. 5. Our results suggest that fish exposed to predators on average reduce investment in immune function and, further, the observed relationships among defences in predator-exposed individuals can best be explained from individual fitness and pace-of-life perspectives.
Data from: Express yourself: bold individuals induce enhanced morphological defences
Organisms display an impressive array of defence strategies in nature. Inducible defences (changes in morphology and/or behaviour within a prey's lifetime) allow prey to decrease vulnerability to predators and avoid unnecessary costs of expression. Many studies report considerable interindividual variation in the degree to which inducible defences are expressed, yet what underlies this variation is poorly understood. Here, we show that individuals differing in a key personality trait also differ in the magnitude of morphological defence expression. Crucian carp showing risky behaviours (bold individuals) expressed a significantly greater morphological defence response when exposed to a natural enemy when compared with shy individuals. Furthermore, we show that fish of different personality types differ in their behavioural plasticity, with shy fish exhibiting greater absolute plasticity than bold fish. Our data suggest that individuals with bold personalities may be able to compensate for their risk-prone behavioural type by expressing enhanced morphological defences.
Chaoborus induced defences in Daphnia pulex (raw images)
<p>Raw images of Daphnia pulex exposed to control conditions or predator cues from Chaoborus larvae (<a href="/api/files/e95ff93a-55d1-46c8-b548-83c68b3fb4d7/DAPCHA_raw_images_Daphnia.tar.gz?versionId=0c3fee60-e92d-4a62-97b5-c2e571040c75">DAPCHA_raw_images_Daphnia.tar.gz</a>)</p> <p>Raw images of microstage meters; each image is associated with one respective Daphnia image to allow for size estimation of animals (see above) (<a href="/api/files/e95ff93a-55d1-46c8-b548-83c68b3fb4d7/DAPCHA_raw_images_MicrostageMeter.tar.gz?versionId=a0408c06-f030-4252-913f-231bd7928838">DAPCHA_raw_images_MicrostageMeter.tar.gz</a>) </p> <p> </p> <p>File names are coded as below:</p> <p>*_BARCODEid_PONDid_CLONEid_MICROSCOPEstation_DATE.TIME</p>
Data from: The simultaneous inducibility of phytochemicals related to plant direct and indirect defences against herbivores is stronger at low elevation
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Data from: Express yourself: bold individuals induce enhanced morphological defences
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Data from: Defence versus defence: are crucian carp trading off immune function against predator-induced morphology?
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Data from: Induced defences alter the strength and direction of natural selection on reproductive traits in common milkweed
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