Trophic Interactions between Anadromous Juvenile Alewife (<i>Alosa pseudoharengus</i>) and Cyanobacterial Populations in a Shallow Mesotrophic Pond

• 作者: James F. Haney Nancy J. Leland Ryan A. Landon
• 来源期刊: 自然资源(英文)
• 学科: 数学
• 关键词: Cyanobacteria Juvenile Alewife CYANOTOXINS MC BMAA Bioaccumulation Trophic Spectrum
• 年，卷（期）: 2020,（9）
• 页码范围: 394-419
• 页数: 26页
• 分类号: O17

摘要

Alosa pseudoharengus<span style="font-family:;" "=""><span style="font-family:Verdana;"> is an anadromous fish that migrates from marine to freshwaters to spawn. The early larval and juvenile forms are known to be planktivorous, where heavy feeding upon their preferred food source of large crustacean zooplankton often results in changes to composition and size structure within this trophic guild which in turn can result in shifts within the trophic spectrum and a classic trophic cascade. In this study of Lower Mill Pond, Brewster MA, we evaluated the feeding strategy of juvenile </span><i><span style="font-family:Verdana;">Alosa</span></i><span style="font-family:Verdana;"> to </span><span style="font-family:Verdana;">determine whether juvenile alewife switch</span></span><span style="font-family:Verdana;">es</span><span style="font-family:Verdana;"> to feeding</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">largely on cyanobacteria and whether cyanotoxins microcystin (MC) and</span><span style="font-family:;" "=""> <i><span style="font-family:Verdana;">β</span></i><span style="font-family:Verdana;">-methlyamino-L-alanine (BMAA) bioaccumulate in their muscle tissue. Within 15</span></span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">-</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">30 days of their estimated spawning date, overexploitation of crustacean zooplankton resulted in a shift from planktivory to benthic detritivory for the majority of their life history, although this did not reduce their condition based on weight-length relationships (Log Wwt. = _-</span><span style="font-family:;" "=""><span style="font-family:Verdana;">5.503 + (3.101 </span><span style="font-family:Verdana;">×</span><span><span style="font-family:Verdana;"> Log Length). Mean MC (0.003 μg<span style="font-family:Verdana, Helvetica, Arial;white-space:normal;background-color:#FFFFFF;">·</span>g<span style="font-size:10px;"><su