Viertel Bruno
Institute of Zoology, Johannes Gutenberg University, Saarstrasse 21, W-6500, Mainz, Federal Republic of Germany.
Oecologia. 1990 Dec;85(2):167-177. doi: 10.1007/BF00319398.
Ingestion and filtering rates in larval Xenopus laevis, Bufo calamita, Rana temporia and Bufo bufo fed suspensions of Chlorella fusca were investigated. Concentrations were measured with a Coulter Counter. (1) For all species, filtration occurred at concentrations far below those reported by other authors for Rana sylvatica feeding on Chlorella pyrenoidosa. For Bufo bufo, only larvae near metamorphosis showed ingestion at low particle concentrations. Since buccopharyngeal ventilation continues even in the absence of food particles, this threshold feeding behaviour in the younger larvae must be due to different mechanisms to those found in Daphnia and Calanus studied by other authors: probably reduction of the buccal pumping rate and the mucus production of the filter apparatus. (2) For B. calamita, R. temporaria and X. laevis the highest suspension feeding efficiency was at early tadpole stages, corresponding with the high growth rate of these stages. (3) The life histories of the species provide the basis for understanding their different retention efficiencies and functional responses.
研究了摄食小球藻悬浮液的非洲爪蟾、绿蟾蜍、欧洲林蛙和普通蟾蜍幼体的摄食和过滤速率。使用库尔特计数器测量浓度。（1）对于所有物种，过滤发生时的浓度远低于其他作者报道的以蛋白核小球藻为食的北美林蛙的浓度。对于普通蟾蜍，只有接近变态的幼体在低颗粒浓度下表现出摄食行为。由于即使没有食物颗粒，口咽通气仍会继续，较年幼幼体的这种阈值摄食行为必定是由与其他作者研究的水蚤和哲水蚤不同的机制导致的：可能是口腔泵吸速率的降低以及过滤器官黏液分泌的减少。（2）对于绿蟾蜍、欧洲林蛙和非洲爪蟾，最高的悬浮液摄食效率出现在蝌蚪早期阶段，这与这些阶段的高生长速率相对应。（3）这些物种的生活史为理解它们不同的保留效率和功能反应提供了基础。
