Nentwig Wolfgang
Institut für Zoologie der Universität, Universitätsstrasse 31, D-8400, Regensburg, Federal Republic of Germany.
Oecologia. 1989 Jan;78(1):35-40. doi: 10.1007/BF00377195.
During one year in Panama the size (=body length) of arthropods (representing the potential prey of a spider community) was determined by sampling with pitfall traps, bowl traps and sweep-netting. Most arthropods found were small and the distribution of their size is considerably skewed to the left (Figs. 1, 2). Pitfall traps and bowl traps yielded similar results but sweep-netting collected larger arthropods and may be size-selective. Although the variation of arthropod size is high, no seasonal influence on body size could be detected in the main prey groups of spiders (Figs. 3, 4). Differences in the size spectra of the actual prey of a tropical spider community are therefore not caused by seasonal variations in the availability of particular prey size classes. Species-specific prey size spectra, however, may be dependent on properties of the webs concerned, microhabitat selection or other, e.g. physiological or ethological differences between the spider species.
在巴拿马的一年时间里，通过使用陷阱诱捕器、碗形诱捕器和扫网采样，确定了节肢动物（代表蜘蛛群落的潜在猎物）的大小（即体长）。发现的大多数节肢动物都很小，其大小分布明显向左偏斜（图1、2）。陷阱诱捕器和碗形诱捕器得出了相似的结果，但扫网捕获了更大的节肢动物，可能具有大小选择性。尽管节肢动物大小的变化很大，但在蜘蛛的主要猎物群体中未检测到对体型的季节性影响（图3、4）。因此，热带蜘蛛群落实际猎物的大小谱差异并非由特定猎物大小类别的可获得性季节性变化引起。然而，特定物种的猎物大小谱可能取决于相关蛛网的特性、微生境选择或其他因素，例如蜘蛛物种之间的生理或行为差异。
