Article review: Positive feedback between chironomids and algae creates net mutualism between benthic primary consumers and producers (Sagae)

 Blue-green algae are photosynthetic producers. Then, there are primary consumers in the ecosystem that feed on the producers. One of the hypotheses of my research is that blue-green algae are also used as a food resource by many organisms. From this hypothesis, it is natural to predict that algae may be decreasing due to feeding by consumers. However, an interesting phenomenon has been reported in aquatic ecosystems. Herren, 2017, suggests that the presence of primary consumers may increase the primary production of algae. In other words, the more food eating, the more food gets. This effect has been observed in the feeding and decomposition of benthic algae by larvae of the chironomid. At high densities, the larvae of the chironomid increased their secondary production. In my study, larvae of chironomids were collected and the data seem to show a relationship between algae. These surprising effects on the nutrient cycle may be the key to sustainable agriculture.

ミドロ類は藻類の一つで光合成を行う生産者です。さらに生態系には生産者を摂食する一次消費者が存在します。私の研究ではミドロ類もまた多くの生物に餌資源として利用されている、と仮説の一つとしてあげています。この仮説からするにミドロ類は消費者の摂食によって減少していく可能性があると考えるのが自然です。しかし水中の生態系において興味深い現象が報告されています。Herren, 2017によると高密度の一次消費者の存在は藻類の一次生産を高める可能性があることが示唆されています。つまり餌を食べれば食べるほど餌が増えていくということです。この矛盾した効果はユスリカの幼虫の底生藻類の摂食と分解における物質循環の促進によって観察されたと考えられています。ユスリカの幼虫は高い個体密度化においてその二次生産を高めました。私の研究でもユスリカの幼虫が採集され、データからもミドロ類との関係があるように見えます。このような驚くべき物質循環への影響は、持続可能な農業へのカギになるかもしれません。

Article source
https://esajournals.onlinelibrary.wiley.com/doi/abs/10.1002/ecy.1654

LarvesChironomesEuralilleGareTGV20086FL.jpg
F. Lamiot - <span class="int-own-work" lang="ja">投稿者自身による作品</span>, パブリック・ドメイン, リンクによる

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