Feeding biology of carnivore and detritivore Mediterranean pycnogonids
Feeding biology of carnivore and detritivore Mediterranean pycnogonids
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地中海食肉动物和碎食动物的摄食生物学
DOI：
10.1017/s0025315411001287
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发表时间：
2011
影响因子：
1.2
通讯作者：
T. Munilla
中科院分区：
文献类型：
--
作者：
A. Soler;C. Arango;M. Cuadrado;T. Munilla
海蜘蛛（Pycnogonida）的消化系统呈现出在其生态学或摄食行为的背景下尚未讨论的特点。我们调查了两个地中海物种的消化系统，一个食肉物种长柄Ammothella和一个食草Endeis spinosa，特别关注其与行为的摄食习惯的相关性。中肠和后肠部分并没有提出两个物种之间的显着差异，但主要的差异，观察到在前肠，反映了一致性，他们的饮食和摄食行为。在比较两种鱼的食性时，颚部、刚毛唇、咽滤器结构和吻部肌肉组织是主要的鉴别要素。longipes和E.刺状的。这些元素负责将食物果肉减少到亚细胞大小。消化过程中观察到的物种研究同意在其他pycnogonid谱系中观察到的，但不同于大多数海洋节肢动物，主要是因为没有中肠腺细胞和存在一个独特的多功能类型的中肠上皮细胞。上皮消化细胞在饥饿期间以小的“静止”形式存在。在消化过程中，可能含有酶原的分泌颗粒移动到它们的顶端边缘以分泌到中肠腔，次级溶酶体形成并且在其中发生细胞内消化。残留体在上皮细胞内形成，并释放到中肠腔，向后肠运输。的消化过程的特点的研究似乎反映了拟形状态的节肢动物。
The digestive system of sea spiders (Pycnogonida) presents peculiarities that have not been discussed in the context of their ecology or feeding behaviour. We investigated the digestive system of two Mediterranean species, a carnivorous species Ammothella longipes and a detritivorous Endeis spinosa, with special focus on its correlation with behavioural feeding habits. The midgut and hindgut sections did not present significant differences between the two species, but major differences were observed in the foregut, reflecting concordance to their diet and their feeding behaviour. Jaws, setose lips, the structure of the pharyngeal filter and musculature of the proboscis are the main differential elements when comparing feeding habits of A. longipes and E. spinosa. These elements are responsible for the reduction of the food pulp down to subcellular size. The digestion process observed in the species studied agrees with that observed in other pycnogonid lineages, but differs from most marine arthropods mainly because of the absence of midgut gland cells and the presence of a unique multifunctional type of midgut epithelial cell. Epithelial digestive cells are present in a small ‘resting’ form during starvation periods. During digestion, secretion granules possibly containing zymogen move to their apical border to be secreted to the midgut lumen, secondary lysosomes are formed and intracellular digestion occurs within them. Residual bodies are formed within the epithelial cell and released to the midgut lumen to be transported towards the hindgut. The characteristics of the digestive process of the pycnogonids studied seem to reflect a plesiomorphic state in arthropods.