. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OSTREA CHILENSIS PHYLOGEOGRAPHY 123. Figure 1. Polar View of the South Pacific showing Osticu chilciiM-, sampling locations (large arrows) for molecular analysis in New Zealand: Moturekareka Island, Hauraki Gulf (North Island), Foveaux Strait (South Island, 46°43' S. 168°3' E); and in Chile: Quempillen. Isla Chiloe. Small arrows show predominant surface circulation patterns. the separation of New Zealand from Gondwanaland (22), and its New Zealand and Chilean populations are almost indistinguishable allozymically [genetic si
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OSTREA CHILENSIS PHYLOGEOGRAPHY 123. Figure 1. Polar View of the South Pacific showing Osticu chilciiM-, sampling locations (large arrows) for molecular analysis in New Zealand: Moturekareka Island, Hauraki Gulf (North Island), Foveaux Strait (South Island, 46°43' S. 168°3' E); and in Chile: Quempillen. Isla Chiloe. Small arrows show predominant surface circulation patterns. the separation of New Zealand from Gondwanaland (22), and its New Zealand and Chilean populations are almost indistinguishable allozymically [genetic similarity = ; a value of indicates genetic identity (18)]. The fossil record suggests that the New Zealand popula- tion is ancestral, and it is speculated that the Chilean pop- ulation was founded by rafted, post-metamorphic New Zea- land oysters transported via the Antarctic circumpolar and Humboldt currents (18). Alternatively, Chilean populations might have been established by the transoceanic dispersal of ancestral New Zealand larvae with extended planktotrophic pelagic development, followed by independent losses of this developmental mode in both source and founder popula- tions. The simplest hypothesis is that the Chilean population resulted from an undocumented human introduction event, a frequent occurrence for commercially important oysters (23. 24). Samples of sub-fossil O. chilensis were collected for radiocarbon dating from the Raqi-Tubul estuary, a southern Chilean location where this species has been regarded as the sole native oyster (25). Radiocarbon age estimates (95% confidence intervals) of 953-1238 and 2998-3383 years before present (y BP) were obtained for specimens taken respectively from salt marsh sediments and from an oyster midden site (26). Some of the midden specimens had at- tached juvenile oysters (spat) that retained well-preserved larval shells (prodissoconchs) displaying the diagnostic morphological characteristics of this species of o
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
