Related Experiment Video
Updated: May 13, 2025
07:34
Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients
Published on: August 22, 2018
8.2K
A Holistic Approach to Parasitoid-Host Interaction Along an Elevational Gradient Revealed Coevolution Driven by Host
Ľudmila Černecká1, Radek Michalko2, Jakub Sýkora3
1Institute of Forest Ecology Slovak Academy of Sciences Zvolen Slovak Republic.
Ecology and Evolution
|April 14, 2025
Summary
Parasitoid wasp (Hymenoptera: Ichneumonidae) parasitism rates on spiders vary with elevation and habitat. Three-dimensional spider webs may be an evolutionary defense against these specialized wasps.
Area of Science:
- Ecology
- Evolutionary Biology
- Entomology
Background:
- Host-parasitoid interactions are crucial for biodiversity but poorly understood in changing environments.
- Specialized parasitoid wasps (Darwin wasps) and their spider hosts offer a model system to study these dynamics.
Purpose of the Study:
- To investigate the large-scale distribution of polysphinctine Darwin wasps and their parasitism rates on spiders along an elevational gradient.
- To test if parasitism depends on elevation, habitat, and spider community composition.
- To evaluate the hypothesis that three-dimensional (3D) spider webs are an evolutionary adaptation against parasitoid wasps.
Main Methods:
- Field surveys of parasitoid distribution and parasitism rates across a 1500m elevational gradient in central Europe.
- Analysis of parasitism rates in relation to elevation, habitat type (riparian, agroecosystems), and spider foraging guilds (web types).
- Statistical modeling to determine factors influencing parasitism rates and to test the 3D web defense hypothesis.
Main Results:
- Parasitoid distribution and parasitism rates showed significant variation along the elevational gradient, with a humped-shaped relationship for parasitism rate.
- Overall spider parasitism rates were low (4%), highest in riparian habitats, and lowest in agroecosystems.
- Spiders with 3D webs, though dominant, experienced lower parasitism rates than those with 2D webs, suggesting a defensive role for 3D web architecture.
Conclusions:
- Elevational and habitat factors significantly influence host-parasitoid dynamics in Darwin wasps and spiders.
- Three-dimensional web architecture in spiders appears to be an evolutionarily advantageous defense mechanism against specialized parasitoids.
- These findings contribute to understanding host-parasitoid coexistence and the evolution of defensive strategies in response to predation pressure.
Keywords:
elevationhost rangemid‐domain effectparasitism rateparasitoid distributionparasitoid–host interactionMore Related Videos
12:14Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences
Published on: November 17, 2023
1.2K
09:23Methodology for Developing Life Tables for Sessile Insects in the Field Using the Whitefly, Bemisia tabaci, in Cotton As a Model System
Published on: November 1, 2017
11.8K
Related Concept Videos
02:39Predator-Prey Interactions
16.0K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
16.0K
00:58Symbiosis
27.0K
Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
27.0K
01:21Frequency-dependent Selection
21.6K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
21.6K
00:46Trophic Efficiency
20.2K
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
20.2K
02:40Epiphytes, Parasites, and Carnivores
12.9K
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
12.9K
02:02Ecological Niches
23.4K
All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
23.4K