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Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid
- Source :
- PLoS ONE, Vol 16, Iss 8, p e0256745 (2021), PLoS ONE
- Publication Year :
- 2021
- Publisher :
- PLOS, 2021.
-
Abstract
- Sperm morphology is generally uniform within a species due to selective pressures that act to achieve better fertilization outcomes under postcopulatory competitive circumstances. Therefore, polyandry that intensifies post-mating sperm competition should constrain intraspecific sperm polymorphism. Contrary to this paradigm, we previously found that a polyandrous squid, Heterololigo bleekeri, produces dimorphic eusperm (flagellum length dimorphism; FLD), which is closely associated with alternative reproductive tactics (ARTs); large males (consorts) transfer their spermatophores inside the female’s mantle cavity, while small males (sneakers) do so outside the mantle. Thus, FLD was considered as the consequence of different insemination strategies that arise from different modes of sperm competition, sperm storage and the fertilization environment. However, in other squid species showing ARTs, the choice of mating behaviour is rather conditional (i.e., switching mating tactic between consorts and sneakers), which poses the question of whether sperm FLD could have evolved. Here, we investigated five species in the family Loliginidae that exhibit ARTs and found that all species showed sneaker-biased FLD. However, in a species with conditional ARTs, we found FLD rather ambiguous and the testicular somatic index to be nearly continuous among individuals at transitional state, suggesting that plasticity in mating behaviour compromises the disruptive selection on a sperm morphological trait.
- Subjects :
- Male
Physiology
Social Sciences
Pathology and Laboratory Medicine
Animal Cells
Medicine and Health Sciences
Psychology
Mating
reproductive and urinary physiology
Multidisciplinary
Behavior, Animal
Animal Behavior
Reproduction
Decapodiformes
Eukaryota
Spermatozoa
Physiological Parameters
Flagella
Medicine
Female
Cellular Types
Cellular Structures and Organelles
Pathogens
Research Article
Pathogen Motility
Cephalopods
Squids
Virulence Factors
Science
Context (language use)
Animal Sexual Behavior
Biology
Insemination
Intraspecific competition
Animals
Sperm competition
Behavior
Disruptive selection
urogenital system
Organisms
Biology and Life Sciences
Cell Biology
Molluscs
Invertebrates
Sperm
Spermatogonia
Sexual dimorphism
Germ Cells
Evolutionary biology
Sperm Tail
Fertilization
Spermatophore
Mating Behavior
Zoology
Developmental Biology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- PLOS ONE
- Accession number :
- edsair.doi.dedup.....61a13b33e4482148384d74db4c9c428f