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6 results for “Nautilus pompilius”
Data from: Patterns of intraspecific variation through ontogeny–a case study of the Cretaceous nautilid Eutrephoceras dekayi and modern Nautilus pompilius
<p>The magnitude and ontogenetic patterns of intraspecific variation can provide important insights into the evolution and development of organisms. Understanding the intraspecific variation of organisms is a key to correctly pursuing studies in major fields of palaeontology. However, intraspecific variation has been largely overlooked in ectocochleate cephalopods, particularly nautilids. Furthermore, little is known regarding the evolutionary pattern. Here, we present morphological data for the Cretaceous nautilid <i>Eutrephoceras dekayi</i> (Morton, 1834) and the modern nautilid <i>Nautilus</i> <i>pompilius </i>Linnaeus, 1758<i> </i>through ontogeny. The data are used to describe the change of conch morphology and to elucidate the evolutionary patterns of intraspecific variation. We discovered the presence of morphological changes at hatching and maturity, which is shared in every conch parameter in <i>E. dekayi</i> and <i>N. pompilius</i>. We also found that intraspecific variation is high in early ontogeny in both taxa, followed by various patterns in later ontogeny. The high variation in early ontogeny may imply their flexibility of changing the timing of growth events, which may have played an important role in nautilid evolutioin. We assume that the decrease in variation in later ontogeny may indicate developmental constraints. Lastly, we compared the similarity/dissimilarity of ontogenetic patterns of variation between taxa. Results reveal that the similarity/dissimilarity of the ontogenetic pattern differs between <i>E. dekayi</i> and <i>N. pompilius</i>. We conclude that this shift in the ontogenetic pattern of variation may be rooted in changes in the developmental program of nautilids through time. We propose that studying ontogenetic patterns of intraspecific variation can provide new insights into the evolution and development of organisms. </p>
Data from: Patterns of intraspecific variation through ontogeny–a case study of the Cretaceous nautilid Eutrephoceras dekayi and modern Nautilus pompilius
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Data from: Intraspecific variation in cephalopod conchs changes during ontogeny: perspectives from three-dimensional morphometry of Nautilus pompilius
Intraspecific variation of organisms is of great importance to correctly carry out taxonomic work, which is a prerequisite for important disciplines in paleontology such as community paleoecology, biostratigraphy, and biogeography. However, intraspecific variation is rarely studied in ectocochleate cephalopods (ammonoids and nautiloids), in which an excessive number of taxa were established during the past centuries. Since intraspecific variation of fossilized organisms suffers from various biases (time averaging and taphonomy), an extant example is needed for actualistic comparison. We applied 3D morphometry to 93 specimens of Nautilus pompilius from three different geographic populations. This dataset was used to examine the intraspecific variation throughout ontogeny in detail. Although there are slight differences between the populations as well as some measurement biases, a common pattern of intraspecific variation appears to be present. High variation appears early in ontogeny and then decreases gradually in the following ontogenetic stages. Subsequently, the variation shows an increase again before maturity until a sharp increase or decrease occurs towards the end of ontogeny. Comparison with intraspecific variation of ammonoids and belemnites illustrated that some groups have ontogenetic patterns of intraspecific variation, which are similar to that of N. pompilius. This implies that the above-mentioned ontogenetic pattern of intraspecific variation might be common in some major cephalopod clades.
Data from: The genetic structure of Nautilus pompilius populations surrounding Australia and the Philippines
Understanding the distribution of genetic diversity in exploited species is fundamental to successful conservation. Genetic structure and the degree of gene flow among populations must be assessed to design appropriate strategies to prevent the loss of distinct populations. The cephalopod Nautilus pompilius is fished unsustainably in the Philippines for the ornamental shell trade and has limited legislative protection, despite the species' recent dramatic decline in the region. Here, we use 14 microsatellite markers to evaluate the population structure of N. pompilius around Australia and the Philippines. Despite their relative geographical proximity, Great Barrier Reef individuals are genetically isolated from Osprey Reef and Shark Reef in the Coral Sea (FST = 0.312, 0.229, respectively). Conversely, despite the larger geographical distances between the Philippines and west Australian reefs, samples display a small degree of genetic structure (FST = 0.015). Demographic scenarios modelled using approximate Bayesian computation analysis indicate that this limited divergence is not due to contemporary gene flow between the Philippines and west Australia. Instead, present-day genetic similarity can be explained by very limited genetic drift that has occurred due to large average effective population sizes that persisted at both locations following their separation. The lack of connectivity among populations suggests that immigrants from west Australia would not facilitate natural recolonization if Philippine populations were fished to extinction. These data help to rectify the paucity of information on the species' biology currently inhibiting their conservation classification. Understanding population structure can allow us to facilitate sustainable harvesting, thereby preserving the diversity of genetically distinct stocks.
Data from: Intraspecific variation in cephalopod conchs changes during ontogeny: perspectives from three-dimensional morphometry of Nautilus pompilius
Open the record for dataset details and reuse information.
Data from: The genetic structure of Nautilus pompilius populations surrounding Australia and the Philippines
Open the record for dataset details and reuse information.
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