Page:Biodiversity Assessment of the Fishes of Saba Bank Atoll, Netherlands Antilles.pdf/36

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Table 2. Cont.

Station numberRoving & RotenoneCoordinatesDateDepth (m)Local nameDescription of habitat
Saba-06-2317o30.580N; 63o27.595W13 Jan 200628Rotenone-flat bottom in central area of bank
Saba-06-2417o20.766N; 63o15.008W14 Jan 200631Coral GardenRotenone-coral groove at top of steep outer dropoff on SE side of Saba Bank, rock, coral, and sponges, sand at bottom of groove.
Saba-06-2517o21.162N; 63o15.138W14 Jan 200618Rotenone-near Coral Garden at SE edge of Saba Bank, small ledge on edge of sand and rubble flat, gorgonians, coral and rock
Saba-06-26No label with these-specimens taken at one or more of the other stations, but their locality labels were lost
Saba 2007-0117.51206 N; 63.2332 W20 Jun 200729-38Poison Bank- rotenone-dead and live coral channel with rubble on deep reef.
Saba 2007-0217.46028 N; 63.2517 W20 Jun 200715-19Twin Peaks- rotenone-algae covering rock and some sand on a low ridge


(Mao Tau) in EstimateS v.8.0 software [1]. Total expected richness was estimated using Chao2 and Jack1 estimators.

Figure 202. Hierarchical clustering dendrogram of stations showing significant differences (black bars) among fish assemblages at deep stations versus middle-depth and shallow stations (SIMPROF, P<0.05).

A Bray-Curtis resemblance matrix was generated from a matrix of presence/absence data from 12 combined roving surveys and rotenone collections in order to produce a non-metric multidimensional scaling (MDS) ordination and group averaged hierarchical clustering dendrogram in PRIMER v. 6.1 software [2]. The ANOSIM statistic was employed to test for a priori differences between habitat types and depth classes. A dendrogram based on group averaged hierarchical cluster techniques was used to illustrate the differences among depth classes (Figure 202). Color codes are derived from the similarity profile (SIMPROF) statistic in Primer 6.1. SIMPROF is less powerful than ANOSIM, intended for a posteriori tests of structure in the data. The test was employed here for representational purposes. A second data matrix of species presence and absence was introduced for an a posteriori test of genuine data structure among Caribbean localities, using the Bray-Curtis resemblance measure to determine the level

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