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5�C30.2��) http://www.selleckchem.com/products/a-1331852.html with support from at least two null models (Table 1). In the six datasets a total of 56 taxa, representing ?49% of sessile species (Collothecaceae?=?17; Flosculariaceae?=?39) listed by [32] were present. Their species richness (S) and mean S per hydrophyte (��) varied widely, 13�C40 and 4.0�C16.4, respectively, while �� proportional diversity (��p), an index of the difference in species composition among all hydrophytes in a habitat (��p?=?S/��), ranged from 2.0 to 3.6. In the nested habitats this means that smaller assemblages of species comprised non-random, nested subsets of those on hydrophytes with larger sessile communities. In the absence of nestedness, sessile species would be assembled randomly on the available hydrophytes. The best example of a nested dataset is that of Thale Noi Lake, with S?=?40 (12 genera). In the packed matrix (Fig. http://www.selleckchem.com/products/avelestat-azd9668.html 1), each filled square indicates that a species was observed on a hydrophyte. The open circle is the inflection point that delineates the approximate position of the matrix isocline of perfect nestedness (dashed line) [37]. In a perfectly nested situation, all interactions would lie above the isocline (i.e., to the upper left of the isocline) and none below. While this dataset (Table 1, row G) has a matrix T of 12.3�� supported by 4 null models (p http://www.selleck.cn/products/PLX-4720.html pairings were within a feeding guild: that is, both species were raptorial or both microphagous [42]. The remaining four pairs were exclusions that crossed guild lines: for example, Stephanoceros fimbriatus (raptorial) v. Ptygura wilsonii (microphagous). As illustrated by the high number of singletons (n?=?11, i.e., 27.5% of the species pool), this assemblage also showed high spatial turnover. These changes in community structure �C seen in the progressive decrease in sessile colonists (i.e., left to right in Fig. 1) �C probably reflect species responses to substantial differences in the environment created by the various hydrophyte species. However, these taxa showed no obvious pattern in their feeding type (e.g., 6 microphagous vs. 5 raptorial species). Three rotifers had high idiosyncratic T (Acyclus sp., Collotheca heptabrachiata, and Limnias ceratophylli), but there appears to be no distinguishing common characteristic among these taxa (e.g., presence of, or composition of a tube; feeding type). Two idiosyncratic hydrophytes (Ceratophyllum demersum and Utricularia aurea) comprised 24% of the discrepancy shifts.