Decapod Crustaceans of the Headwater Streams of Pohnpei, Eastern Caroline Islands, Federated States of Micronesia

Abstract

Two species of Macrobrachium (Palaemonidae) and three atyid shrimp (Atyidae) species were identified among 986 decapod crustaceans collected in headwater streams on Pohnpei, Micronesia, during 1999 and among incidental collections in 2000. None is endemic to the island; all are indigenous or at least not of recent human introduction, and all occur widely in the Indo-West Pacific region and have a diadromous life history pattern. Both Macrobrachium lar (Fabricius, 1798) and M. latimanus (Von Martens, 1868) are common in Pohnpei rivers, but M. latimanus outnumbers M. lar especially in the uppermost reaches. Atyoida pilipes (Newport, 1847) accounted for 72% of the atyid sample, and it was the only decapod recorded at elevations as high as 604 m; Caridina weberi (De Man, 1892) composed 21 % of the sample and C. typus (H. Milne Edwards, 1837) 6.4%. Ovigerous females were collected throughout the year for three of the five species; the absence of ovigerous Macrobrachium lar and Caridina typus during August-November was possibly due to small sample sizes. Freshwater shrimps do not currently form an important part of the diet of Pohnpei islanders, but historical accounts suggest that shrimps were utilized more in the past when imported foods and advanced technology for harvesting marine resources were not readily available.INFORMATION ON THE distribution and abundance of the freshwater biota of Micronesian islands is scanty and widely scattered in the literature. Maciolek and Ford (1987) furnished the first comprehensive inventory of stream macrofauna on Pohnpei. They reported on 44 species, including 10 decapod crustaceans (seven atyids, two palaemonids, and one grapsid crab); their samples were I

Wetlands of the Pacific Island region

“…In headwater streams of Pohnpei, Buden et al (2001) collected 986 decapod crustaceans (freshwater shrimps) of which all are indigenous though none endemic, and all occur widely in the region. Slope clearance may alter stream conditions deleteriously.…”

Benthic Community Structure and Invertebrate Drift in a Pacific Island Stream, Kosrae, Micronesia1

“…With the exception of Stenogobius sp. (Gobiidae) and C. serratirostris (Atyidae), all the shrimps, snails, and fishes found in the Inem were also recorded from neighboring Pohnpei by Maciolek and Ford (1987), Buden, Lynch, Short, and Leberer (2001), and Buden, Lynch, and Watson (2001). Both Stenogobius and C. serratirostris are lowland taxa (Marquet 1991, Nelson et al 1997) that may not have been present at the relatively high Pohnpei sites of these surveys.…”

An Integrative Taxonomic Revision of the Freshwater Atyid Shrimps (Crustacea: Decapoda: Caridea) of Micronesia

“…wycki [12], C. brachydactyla, C. longirostris, C. vitiensis, and C. weberi [13], C. weberi [14], C. weberi and C. sp. [15], and C. weberi [16]. [23] 4 Antecaridina lauensis [18] Halocaridinides sp.…”

“…wycki [12], C. brachydactyla, C. longirostris, C. vitiensis, and C. weberi [13], C. weberi [14], C. weberi and C. sp. [15], and C. weberi [16]. The atyid shrimp fauna of Micronesia has been studied in the past, with most records focusing on single islands (see Table 1) as early as Schenkel [6], who reported Atyoida pilipes from Pohnpei, or Bouvier [7], who reported three species from the Mariana Islands.…”