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Molecular analyses reveal high cryptic diversity of trematodes in a sub-Arctic lake
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-03-14)
To identify trematode diversity and life-cycles in the sub-Arctic Lake Takvatn, Norway, we characterised
120 trematode isolates from mollusc first intermediate hosts, metacercariae from second intermediate
host fishes and invertebrates, and adults from fish and invertebrate definitive hosts, using molecular
techniques. Phylogenies based on nuclear and/or mtDNA revealed high species richness (24 ...
High parasite diversity in the amphipod Gammarus lacustris in a subarctic lake
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-05)
Amphipods are often key species in aquatic food webs due to their functional roles in the ecosystem and as intermediate hosts for trophically transmitted parasites. Amphipods can also host many parasite species, yet few studies address the entire parasite community of a gammarid population, precluding a more dynamic understanding of the food web. We set out to identify and quantify the parasite ...
Cercarial behaviour alters the consumer functional response of three-spined sticklebacks
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-22)
<ol>
<li>Free-living parasite life stages may contribute substantially to ecosystem biomass and thus represent a significant source of energy flow when consumed by non-host organisms. However, ambient temperature and the predator's own infection status may modulate consumption rates towards parasite prey.</li>
<li>We investigated the combined effects of temperature and predator infection status ...
Taxa-specific activity loss and mortality patterns in freshwater trematode cercariae under subarctic conditions
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-11)
Cercarial activity and survival are crucial traits for the transmission of trematodes. Temperature is particularly important, as faster depletion of limited cercarial energy reserves occurs at high temperatures. Seasonal climate conditions in high latitude regions may be challenging to complete trematode life cycle during the 6-month ice-free period, but temperature effects on the activity and ...
Temperature does not influence functional response of amphipods consuming different trematode prey
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-26)
Direct consumption on free-living cercariae stages of trematodes by non-host organisms interferes with trematode transmission and leads to reduced infections in the next suitable hosts. Consumer functional responses provide a useful tool to examine relationships between consumption rates and ecologically relevant prey densities, whilst also accounting for abiotic factors that likely influence ...
Somatic Dimorphism in Cercariae of a Bird Schistosome
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-24)
Phenotypic polymorphism is a commonly observed phenomenon in nature, but extremely
rare in free-living stages of parasites. We describe a unique case of somatic polymorphism in
conspecific cercariae of the bird schistosome Trichobilharzia sp. “peregra”, in which two morphs,
conspicuously different in their size, were released from a single Radix balthica snail. A detailed
morphometric analysis ...
Cercariae of a Bird Schistosome Follow a Similar Emergence Pattern under Different Subarctic Conditions: First Experimental Study
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-03)
The emergence of cercariae from infected mollusks is considered one of the most important adaptive strategies for maintaining the trematode life cycle. Short transmission opportunities of cercariae are often compensated by periodic daily rhythms in the cercarial release. However, there are virtually no data on the cercarial emergence of bird schistosomes from freshwater ecosystems in northern ...