Blind shrimp and goby fish: Irreducibly complex?

 

CLAIM: The symbiotic relationship between blind shrimp and goby fish is irreducibly complex. (Von Vett & Malone, 2017, p.283)

RESPONSE: The symbiotic relationships between blind shrimp and goby fish exhibit a spectrum from facultative response to obligate mutualism, with varying degrees of dependency and behavioral complexity. Research has documented that some goby species maintain loose associations with shrimp, lacking the intricate signaling behaviors observed in more interdependent pairs - for instance, studies on the shrimp Alpheus floridanus has shown differences in the strength and nature of its relationship with goby fish. The goby Ctenogobius saepepallens is considered an opportunistic mutualist, engaging in less specialized relationship with the shrimp, while Nes longus is an obligate mutualist, exhibiting a high degree of dependency and more coordinated behavior with its shrimp partner. (Lyons, 2013; 2014)

This invalidates the central claim that the relationship between gobies and blind shrimp is irreducibly complex, since irreducible complexity states that certain biological systems are composed of interdependent parts, all of which are necessary for functionality - if any parts of the system are removed, then the system ceases to function. (Behe, 2006) The fact that the relationship between blind shrimp and goby fish can function along a spectrum removes it from meeting the requirements for irreducible complexity. This spectrum aligns with broader evolutionary models regarding the development of mutualistic relationships, where cooperation evolves from opportunistic interactions through incremental steps leading to specialized partnerships. (Leigh Jr., 2010)

CONCLUSION
In summary the diversity in goby-shrimp associations, ranging from facultative to obligate, illustrates that their relationship is not irreducibly complex. Instead it reflects a continuum where mutualistic behaviors can develop and become more specialized over time, influenced by ecology and the benefits derived from cooperation, favoring evolutionary models.

REFERENCES AND FURTHER READING

Behe, M. (2006) Darwin's Black Box: The Biochemical Challenge to Evolution. Free Press (2nd ed.).

Leigh Jr., E. G. (2010) The evolution of mutualism. Journal of Evolutionary Biology, 23(12), 2507-2528.

Lyons, P. J. (2014) Behavioral differences among mutualistic species in a shrimp-goby association. Marine Ecology Progress Series, 510, 101-106.

Lyons, P. J. (2013) The benefit of obligate versus facultative strategies in a shrimp-goby mutualism. Behavioral Ecology and Sociobiology, 67, 737-745.

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