Population dynamics of an ectoparasitic gastropod, Hypermastus sp. (Eulimidae), on the sand dollar, Arachnoides placenta (Echinoidea)

Crossland, Michael D.; Alford, Ross A.; Collins, JD

doi:10.1071/mf9910069

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…It was suggested that some individuals of H. obliquistomum develop directly to females, while others pass through a male phase (Warén et al , 1994) since there are two forms in large females and the more slender of the two has a vestigial penis and a well-developed pallial oviduct. Both H. placentae and H. tenuissimae were suggested to change sex from male to female because large males equivalent to mature females in size were occasionally found (Crossland et al , 1991; Warén & Crossland, 1991). Though overlapping of size distributions of mature males and females were detected in this study (Table 2), no evidence for H. tokunagai changing sex could be obtained.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Growth and reproductive cycle of Hypermastus tokunagai (Caenogastropoda: Eulimidae), an ectoparasite of the sand dollar Scaphechinus mirabilis (Clypeasteroida: Scutellidae) in the Seto Inland Sea, Japan

2012

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Hypermastus tokunagai is a eulimid gastropod infecting the sand dollar Scaphechinus mirabilis. The eulimid is easily detached from the host and thus regarded as a temporary parasite. In this study, the growth and reproductive cycle of H. tokunagai were investigated using specimens collected from S. mirabilis in the western Seto Inland Sea, Japan. Newly recruited individuals of H. tokunagai appeared in early autumn and grew rapidly, while growth was retarded from mid-autumn to winter months. A second rapid growth occurred the following summer. Based on the growth pattern, the life span of H. tokunagai was estimated to be more than 20 months. This longer life span compared to other eulimids could be due to the accessibility and population stability of its host S. mirabilis. Maturation of H. tokunagai occurred within a short period in the summer, and was synchronized with the second growth phase. Hypermastus tokunagai showed size dimorphism between sexes and an investigation on change in shell shape with growth revealed that this characteristic can be attributed to the female's acquisition of a larger shell within a short time during its maturation period.

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Section: Discussionmentioning

confidence: 99%

“…Several authors have found important ecological aspects of eulimids (e.g. Elder, 1979; Fujioka, 1985; Crossland et al , 1991) but our knowledge is not enough to understand the complex life history traits of eulimids.…”

Section: Introductionmentioning

confidence: 99%

Growth and reproductive cycle of Hypermastus tokunagai (Caenogastropoda: Eulimidae), an ectoparasite of the sand dollar Scaphechinus mirabilis (Clypeasteroida: Scutellidae) in the Seto Inland Sea, Japan

2012

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“…Thus, the close relationship between infestation and recruitment also suggests infestation is seasonal, with peaks in the middle of the warm season, shortly after each recruitment. Seasonal variation in infestation has been observed in eulimidechinoderm associations (Morton 1979, Crossland et al 1991. However, in such associations, seasonal variability is not due to juvenile recruitment but to variability in nutrient supply.…”

Section: Discussionmentioning

confidence: 99%

Population dynamics, infestation and host selection of Vexilla vexillum, an ectoparasitic muricid of echinoids, in Madagascar

Vaïtilingon¹,

Eeckhaut²,

Fourgon³

et al. 2004

Dis. Aquat. Org.

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The symbiotic interaction, population and infestation dynamics of the muricid Vexilla vexillum (Gmelin, 1791) on 2 echinoid species, Tripneustes gratilla (Linnaeus, 1785) and Echinometra mathaei (Blainville, 1825), was investigated on the barrier reef off Toliara (Madagascar). V. vexillum is an ectoparasitic muricid which was exclusively found in association with sea urchins, on which it moves freely and browses over the integument. Host recovery from damage caused by muricid grazing was dependent on lesion size. Small lesions regenerated while larger ones were subjected to secondary infections, which led to host death. A 27 mo survey (2000 to 2003) of the muricid's population dynamics revealed annual recruitment episodes during the mid-summer season (December to January). Patterns of recruitment peaks were apparently linked to its reproductive cycle. Demographic parameters including growth and mortality rates of the muricid were estimated from analysis of sizefrequency distributions. Growth was described by the von Bertalanffy function. The model predicts that V. vexillum is a fast-growing species in which asymptotic shell length (L ∞ = 1.024 cm) is reached 6 to 7 mo after recruitment. The growth rate constant K, and shell length at settlement L 0 , were estimated from the model. Estimated mortality rate was 55% yr -1 ; V. vexillum has a short lifespan. The observed high growth rate together with the high mortality rate suggest that V. vexillum is a semelparous species. A field survey of the infestation dynamics of V. vexillum was performed during 3 consecutive years, with seasonal variation in parasite prevalence on both echinoid host species. Although both T. gratilla and E. mathaei were infested, a preference towards T. gratilla was noted. This was attributed to T. gratilla's test morphology (which allows better accessibility for grazing), to the muricid's higher recognition capacity of T. gratilla (as determined by olfactory experiments) and to the high recruitment predictability of that particular host. This study provides novel information on the biology of V. vexillum, an echinoid epidermal grazer, and its relationship with 2 ecologically and economically important echinoid species.

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“…Predators and parasites of echinoids include gastropods (Moore 1956;Chesher, 1969;Hughes and Hughes, 1971;Hendler, 1977;Gladfelter 1978;Serafy, 1979;Warén, 1980a;Warén, 1980b;Hughes, 1981;Kier, 1981;Warén et al 1983;Fujioka, 1985;Alekseev and Endelman, 1989;Levitan and Genovese, 1989;Warén and Moolenbeek, 1989;Warén and Mifsud, 1990;Warén and Crossland, 1991;Crossland et al, 1991Crossland et al, , 1993McClintock and Marion, 1993;Oliverio et al, 1994;Rinaldi and Malacologico, 1994;Warén et al, 1994;McClanahan, 1999;Nebelsick and Kowalewski, 1999;Ceranka and Złotnik, 2003;Vaïtilingon et al, 2004;Złotnik and Ceranka, 2005a, b;Neumann and Wisshak 2009;Meadows et al, 2015), polychaetes (Wisshak and Neumann, 2006), crustaceans (Tegner and Levin, 1983;Smith, 1984;Wirtz et al, 2009) including barnacles (Madsen and Wolff, 1965;Cross and Rose, 1994;Donovan et al, 2016) and copepods (Margara, 1946;Roman, 1954), echinoderms (Merril and Hobson, 1970;…”

Section: Introductionmentioning

confidence: 99%

The Ecology of Biotic Interactions in Echinoids

Petsios,

Farrar,

Tennakoon

et al. 2023

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Organisms interacting with echinoids are common and produce diverse traces that are often distinctive and can be preserved in the fossil record. Thus, echinoids provide a wealth of information regarding the role of biotic interactions as drivers of ecological and morphological adaptations over macroevolutionary timescales. Studies documenting interactions with echinoids and the resulting traces have become more numerous. This Element reviews the ecologies of skeletal trace-producing interactions on echinoids in Modern ecosystems and the recognition of those biogenic traces in the fossil record. The authors explore diversification and morphological trends in Meso-Cenozoic echinoid clades and associated predator and parasite groups in the context of selective pressures brought about by the evolution of these biotic interactions. Their intent is that this review promotes additional studies documenting the intensity of biotic interactions with echinoids in both Recent and fossil assemblages and highlights their potential to advance our understanding of ecosystem functioning and evolution. This title is also available as Open Access on Cambridge Core.

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Population dynamics of an ectoparasitic gastropod, Hypermastus sp. (Eulimidae), on the sand dollar, Arachnoides placenta (Echinoidea)

Cited by 10 publications

References 12 publications

Growth and reproductive cycle of Hypermastus tokunagai (Caenogastropoda: Eulimidae), an ectoparasite of the sand dollar Scaphechinus mirabilis (Clypeasteroida: Scutellidae) in the Seto Inland Sea, Japan

Growth and reproductive cycle of Hypermastus tokunagai (Caenogastropoda: Eulimidae), an ectoparasite of the sand dollar Scaphechinus mirabilis (Clypeasteroida: Scutellidae) in the Seto Inland Sea, Japan

Population dynamics, infestation and host selection of Vexilla vexillum, an ectoparasitic muricid of echinoids, in Madagascar

The Ecology of Biotic Interactions in Echinoids

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