First record of a Kabatana sp. microsporidium infecting fish in the Atlantic Ocean

Barber, Iain; Davies, Angela J.; Ironside, Joseph E.; Forsgren, Elisabet; Amundsen, Trond

doi:10.3354/dao02019

Cited by 11 publications

(18 citation statements)

References 15 publications

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“…Further, there is potential for synonymy between EU682928 ( Kabatana sp. JI 2008 Barber et al 2009, infecting G. flavescens ) and I. octospora , which may be clarified by further experimental and phylogenetic studies.…”

Section: Resultsmentioning

confidence: 95%

Evidence for trophic transfer ofInodosporus octosporaandOvipleistophora arlon. sp. (Microsporidia) between crustacean and fish hosts

et al. 2017

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Within aquatic habitats, the hyper-abundant Order Crustacea appear to be the predominant host group for members of the Phylum Microsporidia. The musculature, a common site of infection, provides access to biochemical (carbohydrate-rich) and physiological (mitochondria-rich) conditions conducive to prolific parasite replication and maturation. The significant proportion of body plan devoted to skeletal musculature in Crustacea provides the location for a highly efficient intracellular parasite factory. In this study, we utilize histological, ultrastructural and phylogenetic evidence to describe a previously known (Inodosporus octospora) and novel (Ovipleistophora arlo n. sp.) microsporidian parasites infecting the musculature of the common prawn (Palaemon serratus) from the same site, at the same time of year. Despite similar clinical signs of infection, both parasites are otherwise distinct in terms of pathogenesis, morphology and phylogeny. Based upon partial subunit ribosomal RNA (SSU rDNA) sequence, we show that that I. octospora may be identical to a Kabatana sp. previously described infecting two-spot goby (Gobiusculus flavescens) in Europe, or at least that Inodosporus and Kabatana genera are synonyms. In addition, SSU rDNA sequence for O. arlo places it within a distinct clade containing Ovipleistophora mirandellae and Ovipleistophora ovariae, both infecting the oocytes of freshwater fish in Europe. Taken together, our data provide strong evidence for trophic-transfer between crustacean and fish hosts for two different microsporidians within clade 5 of the phylum. Furthermore, it demonstrates that morphologically and phylogenetically distinct microsporidians can infect the same tissues of the same host species to impart clinical signs which mimic infection with the other.

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Section: Resultsmentioning

confidence: 95%

Evidence for trophic transfer ofInodosporus octosporaandOvipleistophora arlon. sp. (Microsporidia) between crustacean and fish hosts

et al. 2017

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“…This was followed by two still undescribed Kabatana spp. (JI-2008 andGC-2009) isolated from a two-spotted goby (Gobisculus flavescens) (Barber et al 2009) and a mousetail knife fish Gymnorhamphichthys rondoni (Casal et al 2008). While the former shows highest molecular homology with tuna microsporidium, no morphological comparison is feasible since only molecular data were published at this stage, leaving tuna parasite as a morphologically very distinct taxon in Kabatana clade.…”

Section: Discussionmentioning

confidence: 99%

A new xenoma-forming microsporidium infecting intestinal tract of Atlantic bluefin tuna (Thunnus thynnus)

Mladineo

Lovy

2011

Acta Parasitologica

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An undescribed species of Microsporidia Balbiani, 1882 was isolated from the muscularis mucosa of the intestinal mucosa of the reared Atlantic bluefin tuna (Thunnus thynnus). Transmission electron microscopy showed that the pyriform unikaryotic microsporidium, measuring 3.6 µm ± 0.08 in length and 1.8 µm ± 0.04 in width (inferred from TEM sections), had two layers of 14-17 coils of polar filament and a robust manubrium of the filament. No developmental stages were observed in xenoma. Phylogenetic analysis of the small subunit rRNA showed closest similarity with Kabatana spp. (88.4%), clustering the microsporidium together in a sister group with K. takedai and Kabatana sp. (JI-2008)/K. newberryi clade. While recognized Kabatana members show ovoid, rounded to pyriform spore, lack of sporophorous vesicle or xenoma, 3-10 coils of polar filament in 1-2 rows and are localized within cytoplasm of trunk muscle, the new species is markedly pyriform, xenoma forming, with many filament coils in 2 rows and parasitizing smooth intestinal muscle. Since morphological features were not typically congruent with any of Kabatana spp. so far described and molecular clustering indicated paraphyletic position within Kabatana clade, we suggest assigning described species to collective group Microsporidia, as Microsporidium milevae sp. nov., until more evidence permits potential formation of the new genus.

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“…In the W Sweden G. flavescens study population, a proportion of both males and females is infected by a unicellular Kabatana sp. microsporidian parasite ( Barber et al. 2009 ).…”

Section: Environmental Variation Mating Behavior and Sexual Selectimentioning

confidence: 99%

“…2009 ). The microsporidians multiply in colonies in the musculature, destroying the muscle fibers of infected tissue and being visible as ulcerous whitish spots on the exterior of the fish ( Figure 14 ; Barber et al. 2009 ).…”

Section: Environmental Variation Mating Behavior and Sexual Selectimentioning

confidence: 99%

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Sex roles and sexual selection: lessons from a dynamic model system

Amundsen

2018

Current Zoology

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Our understanding of sexual selection has greatly improved during the last decades. The focus is no longer solely on males, but also on how female competition and male mate choice shape ornamentation and other sexually selected traits in females. At the same time, the focus has shifted from documenting sexual selection to exploring variation and spatiotemporal dynamics of sexual selection, and their evolutionary consequences. Here, I review insights from a model system with exceptionally dynamic sexual selection, the two-spotted goby fish Gobiusculus flavescens. The species displays a complete reversal of sex roles over a 3-month breeding season. The reversal is driven by a dramatic change in the operational sex ratio, which is heavily male-biased at the start of the season and heavily female-biased late in the season. Early in the season, breeding-ready males outnumber mature females, causing males to be highly competitive, and leading to sexual selection on males. Late in the season, mating-ready females are in excess, engage more in courtship and aggression than males, and rarely reject mating opportunities. With typically many females simultaneously courting available males late in the season, males become selective and prefer more colorful females. This variable sexual selection regime likely explains why both male and female G. flavescens have ornamental colors. The G. flavescens model system reveals that sexual behavior and sexual selection can be astonishingly dynamic in response to short-term fluctuations in mating competition. Future work should explore whether sexual selection is equally dynamic on a spatial scale, and related spatiotemporal dynamics.

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First record of a Kabatana sp. microsporidium infecting fish in the Atlantic Ocean

Cited by 11 publications

References 15 publications

Evidence for trophic transfer ofInodosporus octosporaandOvipleistophora arlon. sp. (Microsporidia) between crustacean and fish hosts

Evidence for trophic transfer ofInodosporus octosporaandOvipleistophora arlon. sp. (Microsporidia) between crustacean and fish hosts

A new xenoma-forming microsporidium infecting intestinal tract of Atlantic bluefin tuna (Thunnus thynnus)

Sex roles and sexual selection: lessons from a dynamic model system

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