Phytoseiidae

Phytoseiidae
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Subclass: Acari
Superorder: Parasitiformes
Order: Mesostigmata
Family: Phytoseiidae
Berlese, 1916
Subfamilies

Amblyseiinae Muma, 1961
Phytoseiinae Berlese, 1916
Typhlodrominae Scheuten, 1857

Diversity
c. 70 genera, 2,000 species

Phytoseiidae is a family of mites which feed on thrips and other mite species. They are often used as a biological control agent for managing mite pests.[1] Because of their usefulness as biological control agents, interest in Phytoseiids has steadily increased over the past century. In 1950, there were 34 known species.[2] Today, there are 2,731 documented species.[3]

Subfamilies

The Phytoseiidae family contains the following subfamilies:[4]

Lifestyles

Phytoseiids are best known as predators of small arthropods and nematodes, however many species of Phytoseiids are also known to feed on fungi, plant exudates, and pollen.[5]

Scientists have proposed classifications of Phytoseiidae based on their food sources. In the most current version, developed in 2013, Phytoseiids are grouped into four types.[5]

Phytoseiidae as Biological Control Agents

Phytoseiids are an important natural predator of the spider mite.[6] When Phytoseiid populations decline, spider mites can severely damage commercial crops. Since World War II, spider mite (tetranychid) populations have increased due to the use of synthetic pesticides.[6] The reason pesticides have increased spider mite populations remains mysterious to scientists, but it has spurred an interest in Phytoseiids as biological control agents.[6] So far, research has shown that Phytoseiids are effective control agents in their native environments, but introducing them to foreign populations has not been successful in reducing the numbers of spider mites.[6]

Phytoseiid species that act as biological control agents are influenced by the availability of their prey.[7] Phytoseiids can postpone or delay egg production during periods where prey are scarce.[7] This allows them to have a longer lifespan and likely serves as an adaptation to environments where prey availability is variable.[7] In addition to being able to delay reproduction, Phytoseiids are also capable of rapid reproduction when prey is readily available.[7] They reproduce more when prey availability is high, which increases their effectiveness as biological control agents.[7] When prey availability increases, females lay more eggs, and more healthy offspring are produced during reproductive periods.[8] In addition, when prey availability increases, Phytoseiidae kill more prey during reproductive cycles, and the ratio of prey killed to eggs laid increases.[8]

Wolbachia Infections

Wolbachia, a parasitic bacteria that affects a vast array of arthropod species such as Drosophila simulans, is common in Phytoseiidae.[9] It affects gender determination and reproduction of its hosts, making it a powerful agent of evolution.[10] Wolbachia has been detected in many species of Phytoseiidae, both in the field and in the lab.[9] Although most research focuses on Wolbachia in germ line tissues, the bacteria can also be found in somatic tissues.[11] Wolbachia's main method of spreading is to be passed down through the generations in germ line tissues, but it is also capable of being transferred horizontally.[9][11]

Although Wolbachia does not benefit its hosts in any way, it is maintained in the population because infected mothers pass it to their offspring through the ovum. Over time, Wolbachia's presence in a population can lead to complete reproductive isolation of that population from uninfected populations.[10] In other words, Wolbachia causes speciation through reproductive isolation.[10] Some hosts evolve with a dependency on Wolbachia for reproductive functions, so that individuals without Wolbachia infections have lower reproductive fitness.[10]

Wolbachia influences the gender determination of its hosts, making females more common than males.[10] In populations affected by Wolbachia, it is common for females to compete for the right to mate with males.[10] This is one of the ways in which Wolbachia infections can lead to speciation, because females evolve traits that will allow them to better compete for males.[10] In extreme cases, the feminizing effect of Wolbachia can cause the host species to lose the chromosome responsible for female gender.[10] Wolbachia infections are capable of causing the extinction of hosts by making females much more common than males.[10]

Footnotes

  1. ↑ (de Moraes et al. 2004, p. 5)
  2. ↑ ÇOBANOĞLU, Sultan (July 2012). "PHYTOSEIIDAE" (PDF). http://ziraat.uludag.edu.tr/akumral/training%20manuals/fifth_workpackage_phytoseiidae_manual.pdf. Retrieved October 20, 2015. External link in |website= (help)
  3. ↑ ".:: Phytoseiidae Database ::.". www.lea.esalq.usp.br. Retrieved 2015-10-20.
  4. ↑ (Zicha 2004)
  5. 1 2 3 4 5 6 McMurtry, James (December 24, 2013). "Revision of the lifestyles of phytoseiid mites (Acari: Phytoseiidae) and implications for biological control strategies". Systematic & Applied Acarology. doi:10.11158/saa.18.4.1. Retrieved October 20, 2015.
  6. 1 2 3 4 Huffaker, C. B.; Vrie, M. van de; McMurtry, J. A. (1969-01-01). "The Ecology of Tetranychid Mites and Their Natural Control". Annual Review of Entomology 14 (1): 125–174. doi:10.1146/annurev.en.14.010169.001013.
  7. 1 2 3 4 5 Blommers, Leo H. M.; Arendonk, Rolf C. M. van (1979-12-01). "The profit of senescence in phytoseiid mites". Oecologia 44 (1): 87–90. doi:10.1007/BF00346403. ISSN 0029-8549.
  8. 1 2 Friese, D. D.; Gilstrap, F. E. (1982-06-01). "Influence of prey availability on reproduction and prey consumption of Phytoseiulus persimilis, Amblyseius californicus and Metaseiulus occidentalis (Acarina: Phytoseiidae)". International Journal of Acarology 8 (2): 85–89. doi:10.1080/01647958208683283. ISSN 0164-7954.
  9. 1 2 3 Johanowicz, Denise L.; Hoy, Marjorie A. (1996-05-01). "Wolbachia in a Predator–Prey System: 16S Ribosomal Dna Analysis of Two Phytoseiids (Acari: Phytoseiidae) and Their Prey (Acari: Tetranychidae)". Annals of the Entomological Society of America 89 (3): 435–441. doi:10.1093/aesa/89.3.435. ISSN 0013-8746.
  10. 1 2 3 4 5 6 7 8 9 Charlat, Sylvain; Hurst, Gregory D. D.; Merçot, Hervé (2003-04-01). "Evolutionary consequences of Wolbachia infections". Trends in genetics: TIG 19 (4): 217–223. doi:10.1016/S0168-9525(03)00024-6. ISSN 0168-9525. PMID 12683975.
  11. 1 2 Dobson, S. L.; Bourtzis, K.; Braig, H. R.; Jones, B. F.; Zhou, W.; Rousset, F.; O'Neill, S. L. (1999-02-01). "Wolbachia infections are distributed throughout insect somatic and germ line tissues". Insect Biochemistry and Molecular Biology 29 (2): 153–160. doi:10.1016/s0965-1748(98)00119-2. ISSN 0965-1748. PMID 10196738.

References

External links

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