نتایج جستجو برای: trematode

تعداد نتایج: 1578  

2005
K. B. Hay

The shell morphology of mud snails, Zeacumantus subcarinatus, both uninfected and infected by trematodes, was compared to determine if di¡erent trematode species induce di¡erent degrees of alteration in host shell shape. Snails harbouring either the echinostomatid Acanthoparyphium sp., or a double infection by the microphallid Maritrema novaezealandensis and an undescribed philophthalmid specie...

2006
David W. Thieltges

Trematode parasites can affect the molluscan hosts serving as first intermediate hosts in their complex life-cycles in manifold ways, but little is known about trematode-induced effects in second intermediate mollusc hosts. In 2 field experiments in 2 habitats and at 2 tidal heights (low and mid intertidal), controlled infection of blue mussels Mytilus edulis serving as second intermediate host...

2017
Laura Bankers Maurine Neiman

Snail-borne trematodes represent a large, diverse, and evolutionarily, ecologically, and medically important group of parasites, often imposing strong selection on their hosts and causing host morbidity and mortality. Even so, there are very few genomic and transcriptomic resources available for this important animal group. We help to fill this gap by providing transcriptome resources from trem...

Journal: :International journal for parasitology 2011
Tommy L F Leung Robert Poulin

Animals living in colonies or collectives composed of highly-related individuals often produce morphs that are physically and behaviourally specialised to perform specific tasks. Because such morphs are often sterile, their production represents a fitness cost for the colony and there should be an optimal ratio of the numbers of sterile specialists and reproductive members that may be adjustabl...

Journal: :Revista do Instituto de Medicina Tropical de Sao Paulo 2009
Josué de Moraes Marcos Paulo Nascimento da Silva Fernanda Pires Ohlweiler Toshie Kawano

A total of 909 Biomphalaria tenagophila were collected from two areas in Guarulhos (Metropolitan area of São Paulo, São Paulo State, Brazil) to assess larval trematode infections. In all collection sites, only this species was found and 183 (20.13%) harbored trematode infections. In these collections, four morphologically distinguishable types of cercariae were identified by confocal microscopy...

Journal: :The Journal of parasitology 2009
J Koprivnikar R Poulin

Given the importance of temperature for the shedding of trematode infective stages (cercariae) from gastropod first intermediate hosts, we investigated the response to temperature increases of trematodes of the intertidal snail Zeacumantus subcarinatus collected from different latitudes (differing in mean annual summer temperature) on the South Island of New Zealand. We investigated whether she...

Journal: :Journal of evolutionary biology 2013
T Kamiya R Poulin

Intraspecific phenotypic diversification in social organisms often leads to formation of physical castes which are morphologically specialized for particular tasks within the colony. The optimal caste allocation theory argues that specialized morphological castes are efficient at specific tasks, and hence different caste ratios should affect the ergonomic efficiency, hence reproductive output o...

Journal: :Ecology 2016
Erin A Mordecai Alejandra G Jaramillo Jacob E Ashford Ryan F Hechinger Kevin D Lafferty

Competition - colonization tradeoffs occur in many systems, and theory predicts that they can strongly promote species coexistence. However, there is little empirical evidence that observed competition - colonization tradeoffs are strong enough to maintain diversity in natural systems. This is due in part to a mismatch between theoretical assumptions and biological reality in some systems. We t...

Journal: :Parasitology 2013
Isabel Blasco-Costa Anson V Koehler Alice Martin Robert Poulin

Physical habitat structure can influence the distribution and abundance of organisms. In rivers, stream drift, a common process originating from the unidirectional water flow, favours the displacement and downstream dispersion of invertebrates. This process could also generate a gradient in infection levels, leading to decreasing numbers of parasites per host as one moves upstream from the rive...

Journal: :Parasitology 2009
R Poulin

Different lineages experience different rates of phenotypic diversification, resulting in greater or lower variance in the expression of phenotypic traits among the species within a lineage. Here, morphological diversification is investigated in 14 different trematode families, based on a dataset comprising morphometric data on body size and 4 anatomical structures (oral sucker, ventral sucker,...

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