Related Experiment Video
Updated: Jan 21, 2026
08:30
Characterization of Aquatic Biofilms with Flow Cytometry
Published on: June 6, 2018
9.6K
Same but different: aquatic prey capture in paedomorphic and metamorphic Alpine newts
1Institute of Zoology and Evolutionary Research, Friedrich-Schiller-University of Jena, Erbertstr. 1, 07743 Jena, Germany.
Zoological Letters
|August 3, 2019
Summary
Paedomorphosis in salamanders shows conserved prey capture movements across adult forms. However, paedomorphic newts possess larger feeding muscles, enabling more powerful suction strikes for capturing elusive prey.
Area of Science:
- Evolutionary biology
- Herpetology
- Biomechanics
Background:
- Paedomorphosis, the retention of larval traits in adults, is common in salamanders.
- Facultative paedomorphosis, with both paedomorphic and metamorphic adults, occurs in salamandrid newts.
- Previous research on ambystomatid salamanders indicated similar prey capture kinematics despite morphological differences.
Purpose of the Study:
- To investigate if prey capture kinematic stereotypy across morphotypes is unique to ambystomatids or a broader salamander trait.
- To compare feeding apparatus anatomy and muscle physiology between paedomorphic and metamorphic salamandrid newts.
- To determine the functional consequences of morphological differences on prey capture performance.
Main Methods:
- Biplanar high-speed video recordings of prey capture behavior in salamandrid newts.
- Comparative anatomical analysis of skull and hyobranchial skeletons.
- Measurement of physiological cross-sectional area (PCSA) of the rectus cervicis muscle.
Main Results:
- Minor kinematic differences were observed in prey capture between paedomorphic and metamorphic salamandrid newts, suggesting conserved kinematics across morphotypes.
- Significant differences in the feeding apparatus morphology and rectus cervicis PCSA were found, with paedomorphs having twice the PCSA.
- Paedomorphic newts demonstrated the capacity for more powerful suction strikes.
Conclusions:
- Kinematic stereotypy in prey capture across paedomorphic and metamorphic morphotypes appears to be a general feature in salamanders.
- Larger rectus cervicis muscle size in paedomorphic newts contributes to enhanced suction feeding capabilities.
- Increased suction power may explain the superior efficiency of paedomorphs in capturing elusive prey.
Related Concept Videos
02:39Predator-Prey Interactions
21.1K
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.
21.1K
02:22The Colonization of Land
37.4K
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
37.4K
00:54What are Biogeochemical Cycles?
39.2K
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
39.2K
02:31Habitat Fragmentation
21.2K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
21.2K
01:17What is an Ecosystem?
46.7K
Overview
46.7K
02:35What is Evolutionary History?
42.9K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
42.9K