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首页> 外文期刊>Estuarine Coastal and Shelf Science >Feeding dynamics of the invasive gastropod Tarebia granifera in coastal and estuarine lakes of northern KwaZulu-Natal, South Africa
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Feeding dynamics of the invasive gastropod Tarebia granifera in coastal and estuarine lakes of northern KwaZulu-Natal, South Africa

机译：南非夸祖鲁-纳塔尔省北部沿海和河口湖泊中入侵性腹足纲动物塔楼的食性

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摘要

Gut fluorescence and carbon budget techniques were applied to Tarebia granifera (shell height 10—12 mm) at the iSimangaliso Wetland Park, a UNESCO World Heritage Site. This snail has recently invaded a number of estuaries in northern KwaZulu-Natal, where it reaches densities of over 1000 ind. m~(-2) and becomes a dominant component of the benthic community. Its rapid establishment and spread have raised concerns about potential top-down impacts on the ecosystem. This study shows that T. granifera can utilize large amounts of microphytobenthos (MPB) in addition to detritus. In situ total available MPB pigment concentrations ranged from 11.6 to 110.5 mg pigm. m~(-2). T. gram/era's gut pigment content ranged from 54 to 1672 ug pigm. ind~(-1). Gut evacuation rates (k) ranged from 0.36 to 0.62 h~(-1) (R~2 range: 16.2-35.2, P < 0.05). Individual ingestion rates ranged from 6.6 to 30.4 ug pigm. indr~(-1) d~(-1). T. granifera was estimated to consume from 0.5 to 35% of the total available MPB biomass per day, or 1.2—68% of the daily primary benthic production. The carbon component estimated from the gut fluorescence technique contributed 8.7 -40.9% of the total gut organic carbon content. The average carbon daily ration contributed by microalgal biomass was ≈ 16% body carbon per day. Variability in the data was attributed to the complex feeding history of snails. Further studies are needed to validate these results and provide more information on the ecological impact of T. granifera on this wetland and other similar invaded ecosystems, both estuarine and freshwater.
机译：在被联合国教科文组织列为世界遗产的iSimangaliso湿地公园中，将肠荧光和碳收支技术应用于了Tarebia granifera（壳高10至12 mm）。最近，这只蜗牛入侵了夸祖鲁-纳塔尔省北部的许多河口，密度达到1000英亩。 m〜（-2）并成为底栖动物群落的主要组成部分。它的快速建立和传播引起了人们对生态系统自上而下的潜在影响的担忧。这项研究表明，T。granifera除碎屑外还可以利用大量的微底栖动物（MPB）。原位总有效MPB颜料浓度范围为11.6至110.5 mg猪。 m〜（-2）。革兰氏菌/时代的肠道色素含量范围为54至1672 ug猪。 ind〜（-1）。肠道疏散率（k）为0.36至0.62 h〜（-1）（R〜2范围为16.2-35.2，P <0.05）。个体摄食率范围为6.6至30.4 ug猪。 indr〜（-1）d〜（-1）。据估计，T。granifera每天消耗MPB总生物量的0.5％至35％，或每天初级底栖生物产量的1.2％至68％。由肠荧光技术估算的碳成分占肠有机碳总量的8.7 -40.9％。由微藻生物质贡献的平均每日碳日摄入量约为每天16％的人体碳。数据的差异归因于蜗牛的复杂饲养史。需要作进一步的研究以验证这些结果，并提供更多信息，以了解细叶锥眼对这片湿地和其他类似入侵生态系统（河口和淡水）的生态影响。

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