メイフライネオクロエオントライアングリファーのウラン生物蓄積ダイナミクスと部位固有の予測への応用

Little is known about the underlying mechanisms governing the bioaccumulation of uranium (U) in aquatic insects.私たちは、水性u摂取、食事性uの摂取、および水生baetidメイフライネオクロエン三角鉄の排気のための条件速度定数を実験的にパラメーター化しました。Results showed that this species accumulates U from both the surrounding water and diet, with waterborne uptake prevailing.食物濃度の上昇は、おそらく食物の味覚性を変化させるか、メイフライの消化プロセスを損なうことにより、摂食率を低下させました。蓄積されたUのほぼ90％は、水媒介性暴露が停止してから24時間以内に排除され、昆虫の外皮からの弱く結合したUの脱着を反映しています。N. triAnguliferの実験的に導出された速度定数をBaetid Mayfliesに一般化できるかどうかを調べるために、Mayfly U濃度は水化学を使用して予測され、Grand Canyon（米国）のスプリングスのPeriphytonで測定され、春のU濃度と比較されました。-dwelling mayflies.Predicted and observed mayfly U concentrations were in good agreement.モデル化された部位固有の条件下では、水媒介Uの摂取量が生体内蓄積されたUの52〜93％を占めました。U蓄積は、生体利用可能な溶解U種の低濃度、遅いUの摂取率を含む因子の組み合わせにより、これらの野生集団で制限されていました。food, and fast U elimination.

Little is known about the underlying mechanisms governing the bioaccumulation of uranium (U) in aquatic insects. We experimentally parameterized conditional rate constants for aqueous U uptake, dietary U uptake, and U elimination for the aquatic baetid mayfly Neocloeon triangulifer. Results showed that this species accumulates U from both the surrounding water and diet, with waterborne uptake prevailing. Elevated dietary U concentrations decreased feeding rates, presumably by altering food palatability or impairing the mayfly's digestive processes, or both. Nearly 90% of the accumulated U was eliminated within 24 h after the waterborne exposure ceased, reflecting the desorption of weakly bound U from the insect's integument. To examine whether the experimentally derived rate constants for N. triangulifer could be generalized to baetid mayflies, mayfly U concentrations were predicted using the water chemistry and U measured in periphyton from springs in Grand Canyon (United States) and were compared to U concentrations in spring-dwelling mayflies. Predicted and observed mayfly U concentrations were in good agreement. Under the modeled site-specific conditions, waterborne U uptake accounted for 52-93% of the bioaccumulated U. U accumulation was limited in these wild populations due to a combination of factors including low concentrations of bioavailable dissolved U species, slow U uptake rates from food, and fast U elimination.