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Introduction
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Publications
Publications (30)
Pelagia noctiluca is considered the most important jellyfish in the Mediterranean Sea, due to its abundance and the severity of its stings. Despite its importance in marine ecosystems and the health problems caused by its massive arrival in coastal areas, little is known about its early life stages and its cnidome has never been described. This stu...
The American ctenophore Mnemiopsis leidyi, recently found in Skagerrak off the Swedish west coast, carried parasitic anemone larvae identified as Edwardsiella sp. In the Western Atlantic Ocean, M. leidyi are commonly infected by larvae of American Edwardsiella lineata anemones. It was questioned whether the parasitic larvae came across the Atlantic...
We present an integrative study with molecular phylogenetic reconstructions and morphological assessment across the three Ceriantharia families: Arachnactidae, Botrucnidiferidae and Cerianthidae. The Arachnactidae specimens (Isarachnanthus spp.) form a well-supported clade, whereas Cerianthidae and Botrucnidiferidae are not recovered as monophyleti...
The clinging jellyfish Gonionemus sp. is a small hydromedusa species known historically from the Swedish west coast but not reported in recent times. This species is thought to be native to the northwest Pacific where it is notorious for causing severe stings in humans and is considered invasive or cryptogenic elsewhere. This year, unlike in the pa...
The larval pre‐competency period and competency window are important in delimiting the potential dispersal distance for pelagic larvae of sessile marine fauna. Here, we provide evidence for morphological changes in the late planulae of Lophelia pertusa that have implications for their dispersal potential. Three weeks after spawning, the planulae ga...
The cnidome of the scleractinian cold-water coral Lophelia pertusa (Linnaeus, 1758, syn. Lophohelia prolifera) was described by Carlgren in 1940. Due to a renewed interest in the cnidae of L. pertusa, specifically comparisons of adult and larval cnidae and their functions, we now redescribe the cnidome from material collected at the Tisler reef in...
The cnidom of the sea anemone Sagartiogeton viduatus (Muller, 1776) is described from interference‐contrast light micrographs (LMs) and scanning electron micrographs (SEMs). Special attention is given to nematocyst maturation, including the differentiation of the shaft into proximal and main regions as helical folding of the shaft wall proceeds. Co...
Acontia and mesentery nematocysts of Metridium senile (Linnaeus, 1761) are described from interference-contrast light micrographs (LMs) and scanning electron micrographs (SEMs). The acontia have 2 nematocyst categories grouped into small, medium and large size-classes, including 5 types: of these, large b-mastigophores and large p-amastigophores ar...
Tentacle cnidae of Metridium senile (Linnaeus, 1761) were examined by light microscopy. In addition to spirocysts, feeding-tentacles had 3 nematocyst categories grouped into medium and small size-classes, including 5 types. Spirocysts dominated, especially distally, followed by medium b-mastigophores. The density of cnidae decreased towards the ten...
In examining large acontia b-mastigophore and p-amastigophore nematocysts of the sea anemone Metridium senile (Linnaeus, 1761) darts were observed by interference-contrast light microscopy (LM) and scanning electron microscopy (SEM). The darts consist of closely packed spines detached from the shafts, still in three helical rows. Their spines form...
The cnidom was found to consist of several morphologically distinct types of nematocysts in six investigated species of Campanulariidae. Descriptions are provided for b-rhabdoids (micro-basic b-mastigophores) of two sizes, occurring in the polyps of Campunulariu Integra and Clytia hemisphaerica of the johnstoni and gracilis forms, respectively. The...
The cnidoms of Laomedea flexuosa, Gonothyraea loveni, Obelia geniculata, O. longissima and O. dichotoma were studied by light and scanning electron microscopy to find out whether the nematocysts could be used as taxonomic characters. Three b-rhabdoid heteroneme nematocysts (microbasic b-mastigophore) and three isorhizous haploneme nematocysts (atri...
Acid phosphatases, esterases and leucine aminopeptidases were studied in Campanularia integra, Clytia hemisphaerica (the johnstoni form), Laomedea ftexuosa, Gonothyraea loveni, Obelia geniculata, O. longissima andO. dichotoma, using polyacrylamide gel electrophoresis. Species-specific patterns were obtained, notably regarding acid phosphatase, desp...
The little-known hydroid Laomedea exigua M. Sars, 1857, is recorded for the first time from Scandinavian waters. The species is redescribed and the life cycle, lacking a medusa stage, is confirmed by rearing. The nematocysts are diagnostic of the species. Tentacles and hypostome co-operate in capturing prey.
Cnidocyst nomenclature is based on the structure of the tubule and its armature as viewed in the light microscopy (LM). Investigations utilising optically improved LM and scanning electron microscopy have revealed some errors in the interpretation of the fine structure of tubules and armature of nematocysts. Categories of nematocyst have been modif...
The abundance of Aurelia and Cyanea scyphopolyps on Laminaria saccharina was higher in sheltered, shallow areas compared with more exposed or deep ones. Liberated planulae probably were not transported far away from stranded and trapped jellyfish and settled nearby, preferably in patches on the downward side of the Laminaria thallus.
The principal...
Nematocysts of red-pigmented Cyanea capillata medusae and blue-pigmented Cyanea lamarckii medusae from the Swedish west coast were examined by light and scanning electron microscopy. In addition to homotrichous isorhizas and heterotrichous microbasic euryteles, a new heterotrichous microbasic rhopaloid nematocyst was identified. Nematocyst nomencla...
Circular body wall muscles of Cerebratulus lacteus respond to micromolar concentrations of the neuropeptide Phe-Met-Arg-Pheamide (FMRFa), first isolated from molluscan nervous
tissue. Comparison of the relative body wall contractural potencies of various FMRFa analogs indicates that the Arg-Pheamide
group is necessary for this activity, but the rem...
The morphology, distribution and function of nematocysts in the hydroid Halocordyle disticha were studied by light and scanning electron microscopy. Two types of stenoteles, two types of microbasic b-mastigophores (one with a capsular inclusion) and one type of desmoneme were identified. Prey-capturing experiments were performed with Artemia sp. na...
Thesis (doctoral)--Uppsala University.
Projects
Project (1)
During my PH.D I have studied reproduction, and embryo and larval development in the cold-water coral Lophelia pertusa, with a special focus on development rates and properties of the embryos, and ontogenic shifts in the behaviour of the larvae. The aim was to accommodate biophysical dispersal modellers with biological data to increase the accuracy of dispersal models for this species.
The defence was held April 8, 2016, and a summary of the thesis is available via this link:
http://hdl.handle.net/2077/42046
