Найдено научных статей и публикаций: 3, для научной тематики: Commensal
1.
Karatayev A. Y., Mastitsky S. E., Molloy D. P., Burlakova L. E.
- Journal of Shellfish Research , 2009
This is the first study to quantify the periodic emergence of a Conchophthirus sp. from its bivalve host. Emergence rates
of C. acuminatus from Dreissena polymolpha over the entire 24-day experiment appeared to be directly correlated with infection
intensity. The rate of ciliate emergence from indiv...
This is the first study to quantify the periodic emergence of a Conchophthirus sp. from its bivalve host. Emergence rates
of C. acuminatus from Dreissena polymolpha over the entire 24-day experiment appeared to be directly correlated with infection
intensity. The rate of ciliate emergence from individual mussels varied considerably throughout the experiment at both 14°C and 21°C.
It was not uncommon to have a sampling period in which no emergence was observed immediately followed by a period of high
emergence, e.g., at 14°Cfrom 0 to 25 ciliates and at 21°C from 0 to 720 ciliates. The total mean number of ciliates that were observed
to have emerged from each mussel during the 24-day experiment was significantly higher at 21°C (207 ciliates/mussel) than at 14°C
(29 ciliates/mussel). Our experiments suggested that C. acuminatus have a short survival period outside their host. Although we
observed a maximum survival period of 144 hr (6 days), most ciJiates died within 48 h.
Journal of Shellfish Research (2003) Volume 22, Issue 1: 495-500
2.
Karatayev A. Y., Mastitsky S. E., Burlakova L. E., Molloy D. P., Vezhnovets G. G.
- Journal of Invertebrate Pathology , 2009
We report the results of a two-year study in the Svisloch River (Minsk, Belarus) on the dynamics of infection in Dreissena
polymorpha by nematodes and three ciliate species Conchophthirus acuminatus, Ophryoglena sp., and Ancistrumina limnica. Although
these endosymbionts were present in most of the ...
We report the results of a two-year study in the Svisloch River (Minsk, Belarus) on the dynamics of infection in Dreissena
polymorpha by nematodes and three ciliate species Conchophthirus acuminatus, Ophryoglena sp., and Ancistrumina limnica. Although
these endosymbionts were present in most of the samples, their prevalence and infection intensity differed significantly. C. acuminatus
and A. limnica infection intensities in both years of the study had a maximum in summer and were positively correlated with
water temperature. In contrast, Ophryoglena sp. and nematode infection intensities were considerably lower in summer versus winter
and were negatively correlated with temperature. In the first long-term study to monitor the size and reproductive rate of C. acuminatus,
we found that mean length was negatively correlated with temperature and that temperature was positively correlated with
asexual reproduction, with a peak of cell division in April as water temperatures increased.
Journal of Invertebrate Pathology (2003) Volume 83: 73–82
3.
Karatayev A. Y., Burlakova L. E., Molloy D. P., Mastitsky S. E.
- Journal of Shellfish Research , 2009
Host specificity, extremely high prevalence and infection intensity, and easy sampling make the mantle-cavity ciliate Conchophthirus acuminatus a very convenient model to address numerous fundamental questions relating to symbiosis
and commensalism. The acquisition of food by the ciliate as a result...
Host specificity, extremely high prevalence and infection intensity, and easy sampling make the mantle-cavity ciliate Conchophthirus acuminatus a very convenient model to address numerous fundamental questions relating to symbiosis
and commensalism. The acquisition of food by the ciliate as a result of Dreissena filtration activity is probably the basis of
the symbiosis, with additional benefits to C. acuminatus being shelter, provision of oxygen, and dispersal. The number of C.
acuminatus in a Dreissena population depends on the mussel’s size-frequency distribution as there is a direct correlation between
Dreissena size and infection intensity. Lack of a correlation between host density and commensal infection intensity may indicate
that D. polymorpha and C. acuminatus have a different environmental optimum. Zebra mussels of a given length in each
population may have their own carrying capacity of C. acuminatus infection intensity. Upon reaching this carrying capacity, a
symbiont population may have density-dependent feedback mechanisms, which slow its reproduction rate within a host and/or
increase its emigration from the mussel to maintain an optimal density within its host. Massive emergence of ciliates into open
water may be synchronized with a mass occurrence of recently settled Dreissena juveniles to maximize the infection.
Journal of Shellfish Research (2007) Volume 26, Issue 4: 1153–1160