Copper-driven avoidance and mortality in temperate and tropical tadpoles
Cristiano V M Araújo1, Cândida Shinn1, Matilde Moreira-Santos1
1IMAR-Instituto do Mar, Department of Life Sciences, University of Coimbra, Apartado 3046, 3001-401 Coimbra, Portugal.
Aquatic Toxicology (Amsterdam, Netherlands)
|December 3, 2013
Summary
Amphibian populations decline due to copper contamination. Tadpoles avoid low copper levels, but high concentrations cause mortality, impacting amphibian populations globally.
Area of Science:
- Environmental toxicology
- Amphibian ecotoxicology
- Conservation biology
Background:
- Amphibian populations worldwide face significant declines.
- Anthropogenic contamination is a major contributing factor to amphibian population loss.
- Copper is a widespread environmental contaminant of concern.
Purpose of the Study:
- To assess the impact of copper contamination on amphibian tadpole populations.
- To investigate avoidance and mortality responses of tadpoles to copper exposure.
- To compare responses across three amphibian species from different climatic zones.
Main Methods:
- Utilized a non-forced exposure system with a copper concentration gradient.
- Assessed tadpole ability to detect and avoid copper contamination.
- Examined both avoidance behavior and mortality rates at various copper concentrations.
Main Results:
- All tested tadpole species avoided copper at concentrations as low as 100 μg L(-1).
- Avoidance was the primary driver of population decline at sublethal copper concentrations (up to 200 μg L(-1)).
- Mortality became the dominant factor in population decline at higher copper concentrations (> 450 μg L(-1)).
Conclusions:
- Copper acts as an environmental disruptor by creating low-quality habitats and inducing tadpole avoidance.
- Tadpole avoidance behavior is a significant factor influencing dispersion patterns and susceptibility to other stressors.
- Both avoidance and mortality responses to copper contamination contribute to the decline of amphibian populations.
Related Concept Videos
02:39Predator-Prey Interactions
17.2K
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.
17.2K
02:32Osmoregulation in Fishes
48.9K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
48.9K
02:27Background and Environment Affect Phenotype
5.9K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
5.9K