Two epizootic diseases in ChesapeakeBay commercial clams, Mya arenaria andTagelus plebeius

Diseases of Aquatic Organisms

Karen L. Hudson¹  Christopher F. Dungan¹  Kimberly S. Reece¹  Carol B. McCollough¹  Rosalee M. Hamilton¹ 

关键词: Mollusc neoplasia;    Disseminated neoplasia;    Hemic neoplasia;    Dermo disease;    Perkinsus chesapeaki;    Perkinsus andrewsi;    Softshell clam;    Razor clam;   

DOI  :  10.3354/dao050067

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Declining Chesapeake Bay harvests of softshell clams, together with historical and emerging reports of epizootic diseases in Mya arenaria, prompted a survey in summer 2000 of the health status of selected commercial clam populations. Allsampled populations (8 M. arenaria softshell clam, 2 Tagelus plebeius razor clam) were infected by Perkinsus sp. protozoans at prevalences ranging from 30 to 100% of sampled clams. Nucleotide sequences for the internal transcribedspacer (ITS) region of the rRNA gene complex were determined for clonal in vitro Perkinsus sp. isolates propagated from both M. arenaria and T. plebeius. Multiple polymorphic sequences were amplified from each isolate, butphylogenetic analysis placed all sequences into 2 clades of a monophyletic group, which included both recently described clam parasites P. chesapeaki and P. andrewsi. Sequences amplified from each clonal isolate were found in both sisterclades, one containing P. andrewsi and the other P. chesapeaki. Most (7 of 8) M. arenaria samples were also affected with disseminated neoplasia (DN), at prevalences of 3 to 37%, but neither T. plebeius sample showed DNdisease. Disease mortalities projected for sampled clam populations, especially those affected by both diseases, may further deplete subtidal commercial clam populations in mesohaline portions of Chesapeake Bay.

【 授权许可】

Unknown