Crustacea (excluding Cirripedia) of the Dampier Archipelago, Western Australia
2004; Volume: 66; Issue: 1 Linguagem: Inglês
10.18195/issn.0313-122x.66.2004.169-219
ISSN0313-122X
Autores Tópico(s)Fish Biology and Ecology Studies
ResumoThree hundred and eighty-one crustacean taxa have been identified from collections made during the Woodside Dampier Archipelago diving and dredging expeditions between 1998 and 1999, bringing the total known from the area to 426.Most species (361) belong to the Decapoda.A total of 120 species are new records for the archipelago, 14 are new records for Western Australia, five are new records for Australia and three are new species.Species diversity was greatest in the intertidal and shallow subtidal waters around the islands, where there was generally a high diversity of potential hosts for crustacean symbionts.These areas were characterised by a dominance of xanthoid crabs.Diversity was lowest in the deeper inter-island waters typified by soft and rocky bottoms with few potential hosts.The anomuran Porcellanidae and the brachyuran Portunidae were dominant at these sites.The collection has a high occurrence of Indo-West Pacific species typical of the Northern Australian faunistic province.Crustaceans of the Dampier Archipelago biota was typically algae, sponges, gorgonians and hydroids. Species richness of groupsSpecies richness of the various crustacean groups, measured by the number of species recorded for each one by the diving expeditions (DA1/98 and DA3/99), the dredging expedition (DA2/99) and collectively for the entire survey, are shown in Table 4.The brachyuran Xanthidae, represented by 57 taxa, was the most species rich family followed, in decreasing richness, by the Portunidae, Majidae, Leucosiidae and Porcellanidae with totals of 32,25, 23 and 20 taxa, respectively.While the Pilumnidae have not been fully examined, the family ranks among the most species rich with 28 species so far recognised.It is likely the Alpheidae will also rank highly once the family has been fully examined. Occurrence of groups within the Dampier ArchipelagoThe number of stations at which each crustacean group occurred are given in Table 4, for the diving expeditions (DA1/98 and DA3/99), the dredging expedition (DA2/99) and collectively for the entire survey.The most widespread groups were the Portunidae, Pilumnidae, Alpheidae, Porcellanidae, Xanthidae and Paguroidea, occurring at 120, 106, 102, 97, 96 and 94 of the 165 stations, respectively (Table 4).The ten most commonly occurring species were predominantly anomurans.These were, in order of decreasing occurrence, Lissoporcellana spinuligera (Porcellanidae), Petrolisthes militaris (Porcellanidae), Galathea subsquamata (Galatheidae), Lissoporcellana furcillata (Porcellanidae), penaeid sp. 3 (Penaeidae), Aliaporcellana suluensis (Porcellanidae), Pachycheles sculptus (Porcellanidae), Trapezia cymodoce (Trapeziidae), Calappa terraereginae (Calappidae) and Atergatis floridus (Xanthidae). Site diversitySite species diversity data, measured by the number of species occurring at a station, are given in Tables 2 and3.Site diversity was identified low (10 or less taxa recorded), medium (11 to 20 taxa) or high (21 or more taxa).Of the 165 stations only 28 (17%)..:reG:Qr.ded~h.igh.species diversity, 62 (38%) medium and 75 (45%) low.The five stations with the highest species diversity were from dredging and intertidal stations: DA2/ 62 Flying Foam Passage (30 taxa); DA2/73, south of Rocky Head, Enderby Island (30 taxa); DA2/76 W of the NW point of Goodwyn Island (28 taxa); DA3/42 Georges Reef (28 taxa); and DA3/54 Enderby Island (27 taxa).These stations were generally characterised by complex habitats which supported a broad range of crustacean host Expert
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