你吃什么,你就是什么:苹果蜗牛 Pomacea canaliculata 在其原产地(阿根廷潘帕斯草原南部)是大噬菌体还是食腐动物?

IF 1.4 4区 环境科学与生态学 Q3 LIMNOLOGY
Enzo Manara, Mara Anahí Maldonado, Pablo Rafael Martín
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引用次数: 0

摘要

食草性入侵者会促进群落结构和生态系统功能的变化。苹果螺(Pomacea canaliculata)是一种对湿地植被和水生作物有强烈影响的入侵者。虽然它能利用不同的摄食机制摄取各种营养资源,但通常被认为是一种大型噬菌体。然而,很少有研究能直接证明它们在自然水体中的实际食性,其结果也不完全支持这种取食习性。我们使用显微照片技术分析了P. canaliculata的消化内容物,以描述其在原生地自然饮食的时空变化。胃和肠道的内容物相似,但肠道从未空过,其容量和多样性通常较高。碎屑是最主要的食物(占总丰度的 84.1%),所有蜗牛都食用,而大型植物只有一半的蜗牛食用,仅占总丰度的 8.6%;丝状藻类、动物残骸和草的总丰度低于 5%。尽管大型水草的覆盖率和丰富度在不同地点之间存在差异,但这些取食模式的时空变化很小。在 Encadenadas del Oeste 流域,苹果蜗牛(P. canaliculata)是一种专食碎屑的动物,偶尔也有一些个体食用其他资源,因此可以说是一种机会主义杂食动物。苹果蜗牛入侵对残渣和其他食渣动物的影响很少被研究,尽管它们可能对死亡植物物质的分解分别产生重要的负面和正面影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

You are what you eat: is the apple snail Pomacea canaliculata a macrophytophage or a detritivore in its native range (southern Pampas, Argentina)?

You are what you eat: is the apple snail Pomacea canaliculata a macrophytophage or a detritivore in its native range (southern Pampas, Argentina)?

Herbivorous invaders promote changes in community structure and ecosystem functioning. The apple snail, Pomacea canaliculata, is an invader with strong impacts on wetland vegetation and aquatic crops. While able to feed on diverse trophic resources using different feeding mechanisms it is usually regarded as a macrophytophage. However, studies showing direct evidence of what they actually eat in natural waterbodies are few and their results do not fully support such a feeding habit. We analyzed the digestive contents of P. canaliculata using a micrographic technique to describe the spatiotemporal variation of its natural diet within its native range. Stomach and intestine contents were similar but the intestines were never empty and their volume and diversity were generally higher. Detritus was the dominant food item (84.1% of total abundance) and was consumed by all the snails whereas macrophytes were eaten by only half of the snails and represented only an 8.6% of total abundance; filamentous algae, animal remains and grasses showed lower than 5% of total abundance. The spatiotemporal variation in these feeding patterns was minor, despite the among site variation in macrophyte coverage and richness. In the Encadenadas del Oeste basin, P. canaliculata behaves as a specialist on detritus, with some individuals occasionally consuming other resources and can thus be described as an opportunistic generalist omnivore. The impacts of apple snail invasions on both detritus and on other detritivores have seldom been studied although they may have important negative and positive effects, respectively, on dead vegetal matter decomposition.

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来源期刊
Limnology
Limnology 地学-湖沼学
CiteScore
4.30
自引率
6.20%
发文量
15
审稿时长
>12 weeks
期刊介绍: Limnology is a scientific journal published three times a year, in January, April, and August, by Springer in association with the Japanese Society of Limnology. The editors welcome original scientific contributions on physical, chemical, biological, or related research, including environmental issues, on any aspect of basic, theoretical, or applied limnology that present significant findings for the community of scholars. The journal publishes Rapid communications, Research papers, Review articles, Asia/Oceania reports, and Comments. The aims and scope of Limnology are to publish scientific and/or technical papers in limnological sciences, to serve as a platform for information dissemination among scientists and practitioners, to enhance international links, and to contribute to the development of limnology.
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