Spatial Variation in the Selective Scenarios of Hormathophylla spinosa (Cruciferae)

Gómez,; Zamora,

doi:10.2307/3078988

Cited by 44 publications

(101 citation statements)

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“…The opposite pattern, i.e., lower leaf herbivory with increased spine toughness, would be expected in the case of herbivory by large herbivores e.g., [49], [50], [51], [52], [53]. The main herbivores in our study system were, however, invertebrates, as described in the methods.…”

Section: Discussionmentioning

confidence: 78%

Effect of Habitat Conditions and Plant Traits on Leaf Damage in the Carduoideae Subfamily

Münzbergová

Skuhrovec

2013

PLoS ONE

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Plant traits are the key factors that determine herbivore foraging selection. The traits serving as defense traits against herbivores represent a wide range of traits, such as chemical, physiological, morphological and life-history traits. While many studies considered plant defense traits at the within-species scale, much less is known from comparisons of a wide range of closely related species. The aim of this study was to identify factors responsible for the intensity of leaf damage in the Carduoideae subfamily of Asteraceae, which hosts many invasive species and thus is potential candidate plant species that could be controlled by biological control. Specifically, we wanted to see the relative importance of habitat characteristics, plant size and plants traits in determining the degree of folivory. The study identified several defense traits able to explain differences in herbivory between species after accounting for differences in the habitats in which the species occur and the plant size. Specifically, the most important traits were traits related to the quality of the leaf tissue expressed as the content of phosphorus, water and specific leaf area, which suggests that the leaf quality had a more important effect on the degree of herbivory than the presence of specific defense mechanisms such as spines and hair. Leaf quality is thus a candidate factor that drives herbivore choice when selecting which plant to feed on and should be considered when assessing the danger that a herbivore will switch hosts when introduced to a new range.

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Section: Discussionmentioning

confidence: 78%

Effect of Habitat Conditions and Plant Traits on Leaf Damage in the Carduoideae Subfamily

Münzbergová

Skuhrovec

2013

PLoS ONE

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“…However, further studies are necessary to confirm if tolerance is a general plant response (see Belsky et al 1993) to the same or even different types of damage. In contrast, the expression of resistance may be much more specific (Berenbaum et al 1986), and hence differences in the adaptive value of resistance between sites can arise from diffuse selection imposed by different herbivore species (Gó mez and Zamora 2000;Stinchcombe and Rausher 2001).…”

Section: Environmentally Dependent Adaptive Value Of Tolerance and Rementioning

confidence: 99%

Population Variation in the Cost and Benefit of Tolerance and Resistance Against Herbivory in Datura Stramonium

2004

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In this study we examine the hypothesis that divergent natural selection produces genetic differentiation among populations in plant defensive strategies (tolerance and resistance) generating adaptive variation in defensive traits against herbivory. Controlled genetic material (paternal half-sib families) from two populations of the annual Datura stramonium genetically differentiated in tolerance and resistance to herbivory were used. This set of paternal half-sib families was planted at both sites of origin and the pattern of genotypic selection acting on tolerance and resistance was determined, as well as the presence and variation in the magnitude of allocational costs of tolerance. Selection analyses support the adaptive differentiation hypothesis. Tolerance was favored at the site with higher average level of tolerance, and resistance was favored at the site with higher average level of resistance. The presence of significant environmentally dependent costs of tolerance was in agreement with site variation in the adaptive value of tolerance. Our results support the expectation that environmentally dependent costs of plant defensive strategies can generate differences among populations in the evolutionary trajectory of defensive traits and promote the existence of a selection mosaic. The pattern of contrasting selection on tolerance suggests that, in some populations of D. stramonium, tolerance may alter the strength of reciprocal coevolution between plant resistance and natural enemies.

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“…A nonsignificant goodness-of-fit test, on the other hand, indicates that the model explains the covariance among variables in a way that is not statistically distinguishable from the observed relationship (Mitchell 1993). We used a similar approach as Gomez and Zamora (2000) and took the basic path model (Fig. 1) as our point of departure.…”

Section: Path Analysis and Structural Equation Modelingmentioning

confidence: 99%

“…Thus, the alternative (simpler) models were nested within the basic model (cf. Gomez and Zamora 2000). We illustrate the basic (complete) path model and the best models that were nested within the basic model in the path diagrams in Figures 6 and 7.…”

Section: Path Analysis and Structural Equation Modelingmentioning

confidence: 99%

“…Path-analytical approaches are also useful in analyzes of conflicting selection pressures during the life cycle Sinervo et al 1992), differences in allocation between different environments (Kingsolver and Schemske 1991), populations (Gomez and Zamora 2000), or morphs (this study). The importance of measuring the abiotic environment has been recognized by plant population biologists that have also successfully incorporated such variables into path-analytical models (Kingsolver and Schemske 1991;Schlichting and Pigluicci 1998;Scheiner and Callahan 1999).…”

Section: Interactions Between Condition Traits Social Environment Amentioning

confidence: 99%

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Condition, Genotype-by-Environment Interaction, and Correlational Selection in Lizard Life-History Morphs

2001

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We compared reproductive allocation and variation in condition and survivorship of two heritable female throat color morphs (orange and yellow) in a free-living population of side-blotched lizards (Uta stansburiana). Using path analysis and structural equation modeling, we investigated how variation in the social environment affected clutch size and egg mass and two condition traits (postlaying mass, immunological condition) and how these traits in turn affected female field survival. In the presence of many neighbors, both morphs increased their clutch sizes, although these effects were only significant in yellow females. In addition, yellow females increased their egg mass in the presence of many orange neighbors. Orange females surrounded by many orange neighbors showed sign of stress in the form of immunosuppression, whereas this effect was less pronounced in yellow females. The morphs also differed in the impact of variation in clutch size and egg mass on both condition traits. Finally, female morphotype and immune responsiveness affected fitness interactively, and hence these two traits showed signs of fitness epistasis: Selection gradients on this trait were opposite in sign in the two morphs. The correlational selection gradient (gamma throat x antibody response) between female throat color and antibody responsiveness was -0.365. Our data thus reveal important interactive effects such as genotype-by-environment interaction toward the social environment and morph-specific trade-offs as well as the occurrence of correlational selection. We discuss the use of naturally occurring and conspicuous genetic polymorphisms in field studies of selection and life-history allocation.

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Spatial Variation in the Selective Scenarios of Hormathophylla spinosa (Cruciferae)

Cited by 44 publications

References 0 publications

Effect of Habitat Conditions and Plant Traits on Leaf Damage in the Carduoideae Subfamily

Effect of Habitat Conditions and Plant Traits on Leaf Damage in the Carduoideae Subfamily

Population Variation in the Cost and Benefit of Tolerance and Resistance Against Herbivory in Datura Stramonium

Condition, Genotype-by-Environment Interaction, and Correlational Selection in Lizard Life-History Morphs

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