Developmental Stages of the Crayfish Parasite Psorospermium haeckeli in Thoracic Arteries of Astacus astacus

Rug, Melanie; Vogt, Günter

doi:10.1006/jipa.1994.1088

Cited by 10 publications

(9 citation statements)

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“…It was already described by Grabda (1934) and photographically documented in whole mounts by Nylund & Westman (1983). We have found such closely associated nuclei only in late developing and mature spores (Rug & Vogt 1994 but not in early stages as described by Grabda (1934). Staining of the nuclei is easy in paraffin sections but seems difficult in whole mounts (Grabda 1934).…”

Section: Discussionsupporting

confidence: 86%

“…The envelope seems to confine the parasite within the host tissue. It does not appear to be an impermeable barrier for nutrients since it occurs a.lready around growing spores (Rug & Vogt 1994).…”

Section: Discussionmentioning

confidence: 99%

“…The parasite is found in the connective tissue of the crayfish as a shell-bearing spore with globular contents which develops from a smaller, membrane-bound stage (Grabda 1934, Rug & Vogt 1994. All experiments undertaken so far to stimulate further development of the spore have failed.…”

Section: Introductionmentioning

confidence: 99%

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Microscopic anatomy and histochemistry of the crayfish parasite Psorospermium haeckeli

Vogt¹,

M²

1995

Dis. Aquat. Org.

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Psorospemum haeckeli, a common parasite of the European noble crayfish Astacus astacus, occurs as an egg-shaped spore of ca 100 X 60 X 60 pm, particularly within the collagenous layer of the thoracic arteries and the surrounding subepidermal connective tissue. Smaller numbers are also found within the connective tissues of virtually all organs. The morphology and histology of these spores was investigated by microscopic techniques and the composition of their major structural components was identified by histochemistry. Each spore is enveloped by a layer of connective tissue which is assumed to derive from the host. It varies in thickness and composition among the infected organs. The spore proper consists of a 3-layered shell enclosing many globules. The outer shell layer is composed of solid, collagen-and elastin-negative, proteinaceous plates separated by sutures. The medial shell layer appears less compact and includes glycoprotelns or neutral mucopolysaccharides. The inner layer is composed of 2 membranous structures including glycoproteins, glycolipids, and collagen-and elastin-like proteins. The interior of the spore contains lipid globules of variable size, intensely staining nonlipid globules with crystalline and vacuolar inclusions, and 2 closely associated nuclei. In most of the crayfish investigated some of the spores were encapsulated by haemocytes and melanized.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

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Microscopic anatomy and histochemistry of the crayfish parasite Psorospermium haeckeli

Vogt¹,

M²

1995

Dis. Aquat. Org.

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“…Cerenius et al 2003;Oidtmann et al, 2008;Dunn et al, 2009;Hochwimmer et al, 2009;Kozubikova et al, 2009;Vrålstad et al, 2009), or protists such as Psorospermium haeckeli (e.g. Rug & Vogt, 1994;Gydemo, 1996;Vogt, 1998;Vogt & Rug, 1999;Bangyeekhun et al, 2001), there are other more poorly studied groups. This is the case of Ostracoda belonging to the family Entocytheridae.…”

Section: Introductionmentioning

confidence: 98%

An invaded invader: high prevalence of entocytherid ostracods on the red swamp crayfish Procambarus clarkii (Girard, 1852) in the Eastern Iberian Peninsula

et al. 2011

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The American red swamp crayfish Procambarus clarkii (Girard, 1852) was introduced in 1973 into the Iberian Peninsula for commercial purposes. As a result of both the expansion from the Iberian Peninsula and, probably, further introductions in other European countries, now it is widely distributed throughout much of Europe. The ecological impacts of this invading crayfish have received increasing attention, but nothing is known about its symbiotic entocytherid ostracods outside the American continent. The present survey has examined more than 200 crayfishes from 12 localities distributed over a wide area of Eastern Spain. Entocytherid ostracods were extracted from individual crayfishes and they were identified, counted, assigned to developmental instars and sexed. In all the study locations but one, we found at least one crayfish individual infected by entocytherid ostracods and the species determined was the same in all cases: Ankylocythere sinuosa (Rioja, 1942). The number of ostracods on individual P. clarkii varied notably in relation to crayfish size and also differed significantly among sampling sites. The crayfish size effects on ostracod densities might be related to the amount of resources and to the crayfish age and moulting frequency affecting ostracod distribution and population structure. In addition, the spatial variation in ostracod densities could also be related to site-specific habitat traits and the variability of crayfish population dynamics. Our study represents the first citation of an alien entocytherid species in Europe and demonstrates its wide distribution in the Iberian Peninsula. Further research is needed to know the potential effects of this ostracod species on the ecology of P. clarkii and of native species, with implications on the management of this aquatic invader.

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“…Astacus astacus can harbour both European types, an ovoid spore of ca 100 X 60 X 60 p m with lipid globules of very heterogenous diameter and a narrow envelope of connective tissue around the spore (Nylund et al 1983, Henttonen et al 1992 and a more elongate spore of ca 150 X 50 X 50 pm with small, uniform lipid globules and a broad envelope (Haeckel 1857, Grabda 1934. Both morphotypes develop within the connective tissue of the crayfish from small, m.embrane-bound stages (Rug & Vogt 1994. The existence of separate developmental lines and the abovementioned data on the variety of species infected and on the geographical distribution of the parasite suggest that the term 'Psorospermium haeckeli' may include several species.…”

Section: Austropotamobius Torrentiurn Crayfish Parasitementioning

confidence: 98%

Occurrence of Psorospermium haeckeli in the stone crayfish Austropotamobius torrentium from a population naturally mixed with the noble crayfish Astacus astacus

Vogt¹,

Keller²,

Brandis³

1996

Dis. Aquat. Org.

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Developmental Stages of the Crayfish Parasite Psorospermium haeckeli in Thoracic Arteries of Astacus astacus

Cited by 10 publications

References 0 publications

Microscopic anatomy and histochemistry of the crayfish parasite Psorospermium haeckeli

Microscopic anatomy and histochemistry of the crayfish parasite Psorospermium haeckeli

An invaded invader: high prevalence of entocytherid ostracods on the red swamp crayfish Procambarus clarkii (Girard, 1852) in the Eastern Iberian Peninsula

Occurrence of Psorospermium haeckeli in the stone crayfish Austropotamobius torrentium from a population naturally mixed with the noble crayfish Astacus astacus

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