| metamorphosis in balanomorphan, pedunculated, and parasitic barnacles: a video-based analysis. | cypris metamorphosis was followed using video microscopy in four species of cirripeds representing the suspension-feeding pedunculated and sessile thoracica and the parasitic rhizocephala. cirripede metamorphosis involves one or more highly complex molts that mark the change from a free cypris larva to an attached suspension feeder (thoracica) or an endoparasite (rhizocephala). the cyprids and juveniles are so different in morphology that they are functionally incompatible. the drastic reorganiz ... | 2012 | 22570216 |
| [lipid content and determinism of external sex characteristics in the crab carcinus maenas pennant, parasited by rhizocephalus sacculina carcini thompson]. | | 1953 | 13067320 |
| [absorption of carotenoid pigments from carcinus maenas pennat by its parasite sacculina carcini thompson]. | | 1954 | 13150622 |
| the effect of infection by gram-negative bacteria, and their endotoxins, on the blood-clotting mechanism of the crustacean sacculina carcini, a parasite of the crab carcinus maenas. | | 1966 | 5905541 |
| on the fine structure of the regressing ecdysial glands of carcinus maenas l. (crustacea decapoda) parasitized by sacculina carcini thompson. | the ecdysial glands (y organs) of the crab carcinus maenas regress in the presence of an external parasite, sacculina carcini. this regression is more or less severe and may lead to complete autolysis. three gradual stages in this involutionary process are described. in stage i, the gland cells are nearly normal. nuclei and cytoplasmic organelles remain unchanged, but large vacuoles begin to appear. stage ii corresponds to more or less drastic nuclear pyknosis and cytoplasmic alterations. myelin ... | 1976 | 1268914 |
| [ultrastructural aspects of carcinus maenas l. hemocytes (crustacea, decapoda), parasitized by sacculina carcini thompson (crustacea, cirripeda) : reactive activity, collagen genesis]. | the collagen embedding sacculina roots is synthesized by hemocytes of carcinus maenas and is described. hemocytes engaged in the secretion of collagen as a reaction against a parasite constitute a defensive mechanism still largely unknown within crustacea. | 1976 | 827380 |
| developing the options for managing marine pests: specificity trials on the parasitic castrator, sacculina carcini, against the european crab, carcinus maenas, and related species. | the impacts of introduced marine pests are becoming increasingly apparent, prompting interest in the possibility of their biological control. we undertook laboratory and field experiments on host selection of one potential control agent (the endoparasitic barnacle, sacculina carcini) against its natural host (the widely invasive european shore crab, carcinus maenas) and several confamilial and more distantly related crustaceans. for comparison, we also tested host specificity in a related parasi ... | 2000 | 11058725 |
| an experimental evaluation of host specificity: the role of encounter and compatibility filters for a rhizocephalan parasite of crabs. | the encounter/compatibility paradigm of host specificity provides three qualitative pathways to the success or failure of a potential host-parasite interaction. it is usually impossible to distinguish between two of these (encounter and compatibility filters closed versus encounter filter open and compatibility filter closed) because unsuccessful infection attempts are difficult to observe in nature. we were able to open the encounter filter under experimental laboratory conditions. our analytic ... | 2007 | 17275825 |
| tissue changes in the shore crab carcinus maenas as a result of infection by the parasitic barnacle sacculina carcini. | we studied the effect of parasitic invasion by the barnacle sacculina carcini on shore crabs carcinus maenas collected from the menai straits in north wales, uk. a significant reduction in serum protein and circulating granular, semi-granular and hyaline blood cells was observed in parasitised individuals, while serum ammonium and glucose concentrations were significantly increased. no difference in hepatopancreatic glycogen concentration was found between healthy and parasitised crabs. histolog ... | 2008 | 18714687 |
| parasites of the shore crab carcinus maenas (l.): implications for reproductive potential and invasion success. | the european shore crab, carcinus maenas, is one of the most successful marine invasive species. its success has been in part attributed to the loss of parasites, rekindling an interest in host-parasite interactions and impacts on host fitness in this crab. in the present study, we investigated c. maenas populations from europe, south africa and australia for parasites, and assessed their impact on the fitness of male crabs. for the shore crab, testes weight along with success in mating competit ... | 2011 | 20880423 |
| control region sequences indicate that multiple externae represent multiple infections by sacculina carcini (cirripedia: rhizocephala). | the rhizocephalan barnacle, sacculina carcini, is a common parasite of the european shore crab, carcinus maenas, in which it causes significant detrimental physical and behavioral modifications. in the vast majority of cases, the external portion of the parasite is present in the form of a single sac-like externa; in rare cases, double or even triple externae may occur on the same individual host. here, we use a highly variable dna marker, the mitochondrial control region (cr), to investigate wh ... | 2014 | 25473481 |
| modelling the biological invasion of carcinus maenas (the european green crab). | this paper proposes a system of integro-difference equations to model the spread of carcinus maenas, commonly called the european green crab, that causes severe damage to coastal ecosystems. a model with juvenile and adult classes is first studied. here, standard theory of monotone operators for integro-difference equations can be applied and yields explicit formulas for the asymptotic spreading speeds of the juvenile and adult crabs. a second model including an infected class is considered by i ... | 2016 | 26673728 |
| anatomy of virgin and mature externae of loxothylacus texanus, parasitic on the dark blue crab callinectes rathbunae (crustacea: cirripedia: rhizocephala: sacculinidae). | rhizocephalan parasites are dioecious organisms, in that one or several dwarf males are implanted into the external part of the female parasite soon after it emerges from the interior of the host animal. the structure of the female externa and its resident males is crucial for understanding both the reproductive biology and the taxonomy of these specialized parasites. we use scanning electron microscopy and histological methods to study the anatomy of juvenile and the mature externae of the rhiz ... | 2010 | 19714752 |
| comparative ultrastructure of the root system in rhizocephalan barnacles (crustacea: cirripedia: rhizocephala). | rhizocephalan barnacles are parasites of crustacea. they lack even the rudiments of an alimentary canal, but infiltrate their hosts with a nutrient-absorbing system of rootlets. we review the ultrastructure of the rootlets using light microscopy, sem, and tem in nine species from five families, representing both suborders of the rhizocephala: from the kentrogonida peltogaster paguri, p. curvatus, peltogasterella sulcata, cyphosaccus norvegicus (peltogastridae); lernaeodiscus porcellanae (lernaeo ... | 2001 | 11410937 |