author_facet Lefebvre, F.
Mounaix, B.
Poizat, G.
Crivelli, A. J.
Lefebvre, F.
Mounaix, B.
Poizat, G.
Crivelli, A. J.
author Lefebvre, F.
Mounaix, B.
Poizat, G.
Crivelli, A. J.
spellingShingle Lefebvre, F.
Mounaix, B.
Poizat, G.
Crivelli, A. J.
Journal of Fish Biology
Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
Aquatic Science
Ecology, Evolution, Behavior and Systematics
author_sort lefebvre, f.
spelling Lefebvre, F. Mounaix, B. Poizat, G. Crivelli, A. J. 0022-1112 1095-8649 Wiley Aquatic Science Ecology, Evolution, Behavior and Systematics http://dx.doi.org/10.1111/j.0022-1112.2004.00309.x <jats:p>Variations in the liver and spleen masses of the eel <jats:italic>Anguilla anguilla</jats:italic> were analysed in relation to the parasite load of <jats:italic>Anguillicola crassus</jats:italic> at autopsy (current infection by swimbladder lumen worms) and in relation to the severity of damage observed in the swimbladder (a way of assessing the intensity of past infections). None of these measures of parasite pressure were shown to account for variation in the relative liver mass, either when controlling for somatic mass or eel age. In marked contrast, a significant increase in spleen size was revealed in eels harbouring many lumen worms and also in eels with severe damage in the swimbladder. Splenic enlargement was nearly two‐fold higher among severely affected eels (harbouring more than seven lumen parasites and showing severe damage in the swimbladder) than among infection‐free eels (no lumen parasites and no pathological signs in the swimbladder). Several possible hypotheses are reviewed before arguing for an adaptive host response involving the haematological and immunological functions of the spleen. Indeed, among eels with no pathological signs in the swimbladder, the relative spleen mass was positively associated with the mass of lumen parasites, which suggests a hyper‐synthesis of blood cells by the spleen in response to the bloodsucking activity of lumen worms. Nevertheless, among eels with no lumen parasites at autopsy, there was still an increase in spleen size in relation to the severity of the swimbladder damage, which also suggests a hyper‐synthesis of splenic immune cells (lymphocytes and macrophages) in reaction to damaged tissues and particularly to larvae in the swimbladder wall.</jats:p> Impacts of the swimbladder nematode <i>Anguillicola crassus</i> on <i>Anguilla anguilla</i>: variations in liver and spleen masses Journal of Fish Biology
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title Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_unstemmed Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_full Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_fullStr Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_full_unstemmed Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_short Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_sort impacts of the swimbladder nematode <i>anguillicola crassus</i> on <i>anguilla anguilla</i>: variations in liver and spleen masses
topic Aquatic Science
Ecology, Evolution, Behavior and Systematics
url http://dx.doi.org/10.1111/j.0022-1112.2004.00309.x
publishDate 2004
physical 435-447
description <jats:p>Variations in the liver and spleen masses of the eel <jats:italic>Anguilla anguilla</jats:italic> were analysed in relation to the parasite load of <jats:italic>Anguillicola crassus</jats:italic> at autopsy (current infection by swimbladder lumen worms) and in relation to the severity of damage observed in the swimbladder (a way of assessing the intensity of past infections). None of these measures of parasite pressure were shown to account for variation in the relative liver mass, either when controlling for somatic mass or eel age. In marked contrast, a significant increase in spleen size was revealed in eels harbouring many lumen worms and also in eels with severe damage in the swimbladder. Splenic enlargement was nearly two‐fold higher among severely affected eels (harbouring more than seven lumen parasites and showing severe damage in the swimbladder) than among infection‐free eels (no lumen parasites and no pathological signs in the swimbladder). Several possible hypotheses are reviewed before arguing for an adaptive host response involving the haematological and immunological functions of the spleen. Indeed, among eels with no pathological signs in the swimbladder, the relative spleen mass was positively associated with the mass of lumen parasites, which suggests a hyper‐synthesis of blood cells by the spleen in response to the bloodsucking activity of lumen worms. Nevertheless, among eels with no lumen parasites at autopsy, there was still an increase in spleen size in relation to the severity of the swimbladder damage, which also suggests a hyper‐synthesis of splenic immune cells (lymphocytes and macrophages) in reaction to damaged tissues and particularly to larvae in the swimbladder wall.</jats:p>
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author Lefebvre, F., Mounaix, B., Poizat, G., Crivelli, A. J.
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description <jats:p>Variations in the liver and spleen masses of the eel <jats:italic>Anguilla anguilla</jats:italic> were analysed in relation to the parasite load of <jats:italic>Anguillicola crassus</jats:italic> at autopsy (current infection by swimbladder lumen worms) and in relation to the severity of damage observed in the swimbladder (a way of assessing the intensity of past infections). None of these measures of parasite pressure were shown to account for variation in the relative liver mass, either when controlling for somatic mass or eel age. In marked contrast, a significant increase in spleen size was revealed in eels harbouring many lumen worms and also in eels with severe damage in the swimbladder. Splenic enlargement was nearly two‐fold higher among severely affected eels (harbouring more than seven lumen parasites and showing severe damage in the swimbladder) than among infection‐free eels (no lumen parasites and no pathological signs in the swimbladder). Several possible hypotheses are reviewed before arguing for an adaptive host response involving the haematological and immunological functions of the spleen. Indeed, among eels with no pathological signs in the swimbladder, the relative spleen mass was positively associated with the mass of lumen parasites, which suggests a hyper‐synthesis of blood cells by the spleen in response to the bloodsucking activity of lumen worms. Nevertheless, among eels with no lumen parasites at autopsy, there was still an increase in spleen size in relation to the severity of the swimbladder damage, which also suggests a hyper‐synthesis of splenic immune cells (lymphocytes and macrophages) in reaction to damaged tissues and particularly to larvae in the swimbladder wall.</jats:p>
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spelling Lefebvre, F. Mounaix, B. Poizat, G. Crivelli, A. J. 0022-1112 1095-8649 Wiley Aquatic Science Ecology, Evolution, Behavior and Systematics http://dx.doi.org/10.1111/j.0022-1112.2004.00309.x <jats:p>Variations in the liver and spleen masses of the eel <jats:italic>Anguilla anguilla</jats:italic> were analysed in relation to the parasite load of <jats:italic>Anguillicola crassus</jats:italic> at autopsy (current infection by swimbladder lumen worms) and in relation to the severity of damage observed in the swimbladder (a way of assessing the intensity of past infections). None of these measures of parasite pressure were shown to account for variation in the relative liver mass, either when controlling for somatic mass or eel age. In marked contrast, a significant increase in spleen size was revealed in eels harbouring many lumen worms and also in eels with severe damage in the swimbladder. Splenic enlargement was nearly two‐fold higher among severely affected eels (harbouring more than seven lumen parasites and showing severe damage in the swimbladder) than among infection‐free eels (no lumen parasites and no pathological signs in the swimbladder). Several possible hypotheses are reviewed before arguing for an adaptive host response involving the haematological and immunological functions of the spleen. Indeed, among eels with no pathological signs in the swimbladder, the relative spleen mass was positively associated with the mass of lumen parasites, which suggests a hyper‐synthesis of blood cells by the spleen in response to the bloodsucking activity of lumen worms. Nevertheless, among eels with no lumen parasites at autopsy, there was still an increase in spleen size in relation to the severity of the swimbladder damage, which also suggests a hyper‐synthesis of splenic immune cells (lymphocytes and macrophages) in reaction to damaged tissues and particularly to larvae in the swimbladder wall.</jats:p> Impacts of the swimbladder nematode <i>Anguillicola crassus</i> on <i>Anguilla anguilla</i>: variations in liver and spleen masses Journal of Fish Biology
spellingShingle Lefebvre, F., Mounaix, B., Poizat, G., Crivelli, A. J., Journal of Fish Biology, Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses, Aquatic Science, Ecology, Evolution, Behavior and Systematics
title Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_full Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_fullStr Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_full_unstemmed Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_short Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
title_sort impacts of the swimbladder nematode <i>anguillicola crassus</i> on <i>anguilla anguilla</i>: variations in liver and spleen masses
title_unstemmed Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses
topic Aquatic Science, Ecology, Evolution, Behavior and Systematics
url http://dx.doi.org/10.1111/j.0022-1112.2004.00309.x