behaviour of albino and melanic variants of biomphalaria glabrata say, 1818 (mollusca: planorbidae) following infection by schistosoma mansoni sambon, 1907 comportamento de biomphalaria glabrata variantes albina e melânica frente à infecção pelo schistosoma mansoni

Clicks: 273
ID: 258741
2009
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Abstract
The behaviour of the albino and melanic variants of Biomphalaria glabrata of Belo Horizonte (MG. Brazil) was studied comparatively, in terms of their respective susceptibilities to infection by Schistosoma mansoni of the same origin, through observation of the elimination of cercariae for a three-month period and the calculation of mortality and infection rates, in control and in infected snails. The number of amoebocytes, granulocytes and hyalinocytes in the circulating hemolymph during different periods of infection was analyzed. The evolution of the infection in the tissues was observed by means of histological cross-sections. The melanic variant showed greater susceptibility to infection and a higher mortality rate. The albino variant showed a higher number of circulating amoebocytes, both granulocytes and hyalinocytes. A higher number of degenerated sporocysts were seen in the histological cross-sections of the albino variant. The results suggest that the melanic variant of B. glabrata was more susceptible to infection by S. mansoni than was the albino variant.
Foi estudado comparativamente o comportamento das variantes albina e melânica de Biomphalaria glabrata de Belo Horizonte (MG. Brasil), em relação à susceptibilidade à infecção pelo Schistosoma mansoni de mesma origem, através da observação da eliminação de cercárias por um período de três meses e a verificação das taxas de mortalidade e infecção nos moluscos controles e infectados. Analisou-se também, o número de amebócitos granulócitos e hialinócitos na hemolinfa circulante em diferentes períodos de infecção. A evolução da infecção nos tecidos foi observada através de cortes histológicos. A variante melânica apresentou maior susceptibilidade à infecção e maior taxa de mortalidade. A variante albina apresentou maior número de amebócitos circulantes, tanto granulócitos quanto hialinócitos. Nos cortes histológicos foi verificado maior número de esporocistos degenerados na variedade albina. Por estes resultados sugere-se que nas populações estudadas a variante melânica de B. glabrata, foi mais susceptível à infecção pelo S. mansoni.
Reference Key
allegretti2009brazilianbehaviour Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;SM. Allegretti;JF. Carvalho;LA. Magalhães;EM. Zanotti-Magalhães
Journal international journal of economic and environment geology
Year 2009
DOI
10.1590/S1519-69842009000100029
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842009000100029
Keywords
schistosoma mansoni biomphalaria glabrata

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