Related Experiment Video
Updated: Jan 29, 2026
09:54
Methods for Rapid Transfer and Localization of Lyme Disease Pathogens Within the Tick Gut
Published on: February 14, 2011
12.0K
Local host-tick coextinction in neotropical forest fragments
Helen J Esser1, Edward Allen Herre2, Roland Kays3
1Smithsonian Tropical Research Institute, P.O. Box 0843-03092, Panama City, Panama; Department of Environmental Sciences, Wageningen University & Research, P.O. Box 47, 6700 AA Wageningen, the Netherlands.
International Journal for Parasitology
|February 12, 2019
Summary
Wildlife loss reduces tick diversity, favoring generalist species that can transmit diseases. This highlights how declining animal populations impact tick communities and increase disease risks in disturbed ecosystems.
Area of Science:
- Ecology
- Parasitology
- Disease Ecology
Background:
- Ticks are obligate parasites reliant on vertebrate hosts, making them vulnerable to host extinction.
- Understanding host-parasite coextinction is crucial for predicting tick-borne disease emergence in changing environments.
- Empirical data on the relationship between wildlife diversity and tick communities in disturbed habitats are limited.
Purpose of the Study:
- To test the hypothesis that loss of wildlife abundance and diversity leads to a decline in tick abundance and diversity.
- To investigate the impact of habitat fragmentation on tick community composition and the prevalence of generalist tick species.
- To assess the potential of tick communities as bioindicators of ecosystem health and disease risk.
Main Methods:
- Comparison of vertebrate and tick communities across 12 forest fragments of varying sizes in the Panama Canal region.
- Utilized drag sampling and camera trapping to quantify the abundance and diversity of questing ticks and vertebrate hosts.
- Analyzed the relationship between wildlife abundance/diversity and tick abundance/species richness, including specialist and generalist tick species.
Main Results:
- A positive correlation was found between the abundance and species richness of wildlife and tick communities.
- Specialist tick species were exclusively found in forest fragments harboring their specific final hosts.
- Reduced tick diversity was associated with a higher relative abundance of the generalist tick species *Amblyomma oblongoguttatum*, a potential vector for spotted fever group rickettsiosis.
Conclusions:
- The findings support the host-parasite coextinction hypothesis, demonstrating cascading effects of wildlife loss on tick communities.
- Degraded tick communities, characterized by a dominance of generalist species, may increase opportunities for pathogen transmission.
- Tick diversity and abundance can serve as valuable bioindicators of ecosystem health, reflecting wildlife diversity and potential disease transmission risks.
Related Concept Videos
02:31Habitat Fragmentation
21.3K
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.
21.3K
00:59Mass Spectrometry: Alkene Fragmentation
3.6K
Alkenes lose one electron from the unsaturated π bond upon ionization and form stable molecular ions. Further fragmentation of alkenes occurs through three different reaction pathways. The most prominent fragmentation is the cleavage at the allylic position. The resultant allylic carbocation is resonance stabilized. In the mass spectra of terminal alkenes, this fragment appears at a mass-to-charge ratio of 41. In the internal alkenes, where there are two choices of allylic cleavage, the...
3.6K
00:55Mass Spectrometry: Amine Fragmentation
2.3K
Amines can be identified using mass spectroscopy based on their characteristic fragmentation patterns. The molecular ions of amines undergo fragmentation via ⍺-cleavage. The ⍺-cleavage of the carbon-carbon bonds in amines generates an alkyl radical and resonance-stabilized nitrogen-containing cation.
In amines, the number of nitrogen atoms affects the mass of the molecular ion, which is described by the nitrogen rule of mass spectrometry. This rule states that a compound containing a single...
In amines, the number of nitrogen atoms affects the mass of the molecular ion, which is described by the nitrogen rule of mass spectrometry. This rule states that a compound containing a single...
2.3K
01:05Mass Spectrometry: Cycloalkane Fragmentation
2.2K
In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or branched alkanes. The ring structure of cycloalkanes provides additional stability to the molecular ions, often resulting in prominent ion peaks in the mass spectrum.
For example, cyclohexane molecular ions have a mass-to-charge ratio (m/z) of 84, which tends to produce a stronger signal than linear alkanes like hexane. This stability comes from...
For example, cyclohexane molecular ions have a mass-to-charge ratio (m/z) of 84, which tends to produce a stronger signal than linear alkanes like hexane. This stability comes from...
2.2K
00:54Mass Spectrometry: Cycloalkene Fragmentation
1.6K
The molecular ions of cycloalkenes undergo fragmentation via a retro-Diels–Alder reaction.
1.6K
00:53Mass Spectrometry: Alkyne Fragmentation
2.2K
The fragmentation of alkynes preferentially occurs at the carbon–carbon bond between the α and β carbon of the alkyne bond to generate a 3-propynyl cation (or propargyl cation). In terminal alkynes, there is the only type of fragmentation that yields the 3-propynyl cation. The unsubstituted 3-propynyl cation exhibits a peak at a mass-to-charge ratio of 39. In internal alkynes, the 3-propynyl cation is substituted. For example, 2-pentyne fragments into methyl-substituted 3-propynyl cation,...
2.2K