Annual and decadal surveys of molluscs on intertidal platform reefs in a warming marine environment in the southeastern Indian Ocean provide a baseline for monitoring for future environmental changes

Figures & data

Figure 1. Map of the location of the three study sites along the coastline of Perth, Western Australia (Drawn from Google Maps 2022). Letters identify habitat zones: B bare; S outer Sargassum; IP inner platform with diverse algae; IS inner Sargassum; E Ecklonia.

Table 1. Numbers of temperate, tropical and WA endemic species identified on three Perth coastal platforms in surveys taken between 1983 and 2021.

Year
Distribution	1983	1984	1985	1986	1987	2007	2021
Temperate	30	38	43	43	31	29	26
Tropical	5	7	5	5	4	7	5
Endemic	7	7	8	6	5	6	8
Unknown	6	4	3	5	7	4	6
Total	48	56	59	59	47	46	45

Figure 2. Species richness and diversity indices of molluscs on three intertidal limestone platforms in the Perth metropolitan area from 1983 to 1987, and in 2007 and 2021.

Figure 3. Total mean density of molluscs (3A) and the mussel Brachidontes ustulatus (3B) on three intertidal limestone platforms in the Perth metropolitan area from 1983 to 1987, and in 2007 and 2021.

Figure 4. NMDS plot of three sites for seven surveys conducted between 1983 and 2021. Ellipses represent 95% confidence intervals.

Google Maps (2022) Perth metropolitan coastline Western Australia. Available online at https://goo.gl/maps/TZ8ZGXkWkSAHWTb99 [Accessed on 12 December 2022].

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Data availability statement

The data that support this study are included in the supplementary information.