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6 results for “Juvenile settlement”
Movement of juvenile migratory birds from settlement to adulthood across the non-breeding range
<p>Among migratory vertebrates, high levels of fidelity to non-breeding sites during adulthood are common. If occupied sites vary in quality, strong site-fidelity can have profound consequences for individual fitness and population demography. Given the prevalance of adult site-fidelity, the regions of the non-breeding range to which juveniles first migrate, and the scale of any subsequent movements, are likely to be pivotal in shaping distributions and demographic processes across population ranges. However, inherent difficulties in tracking migratory individuals through early life mean that opportunities to quantify juvenile settlement and movements across non-breeding ranges, and the mechanisms involved, are extremely rare.Through long-term, range-wide resightings of hundreds of colour-marked individuals from their first migration to adulthood, and application of state-space models, we quantify levels of juvenile and adult regional-scale movements and distances at different life stages across the whole non-breeding distribution range in a migratory shorebird, the Black-tailed Godwit (<em>Limosa limosa islandica</em>). We show that the probability of individuals changing non-breeding regions (seven historical wintering regions spanning the Western Europe range) at all ages are very low (mean movement probability = 10.9% from first to subsequent winter, and 8.3% from first adult winter to later winters). Movement between regions was also low between autumn and winter of the same year for both juveniles (mean movement probability = 17.0%) and adults (10.4%). The great majority of non-breeding movements from the first autumn to adulthood were within regions and less than 100 km. The scarcity of regional-scale non-breeding movements from the first autumn to adulthood means that the factors influencing where juveniles settle will be key determinants of non-breeding distributions and of the rate and direction of changes in distributions.</p>
Movement of juvenile migratory birds from settlement to adulthood across the non-breeding range
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FIGURE 4 in The larval, juvenile, and adult stages of the Caribbean goby, Coryphopterus kuna (Teleostei: Gobiidae): a reef fish with a pelagic larval duration longer than the post-settlement lifespan
FIGURE 4. Sagittal otolith of a 15.3 mm SL Coryphopterus kuna: the dark rod-shaped primordium is at far left, surrounded by the prehatching core (white oval), then followed by wide larval increments, sharply narrowing before the settlement transition (white arrow); the edge of the otolith is at far right; length of arrow=30 microns.
FIGURE 2 in The larval, juvenile, and adult stages of the Caribbean goby, Coryphopterus kuna (Teleostei: Gobiidae): a reef fish with a pelagic larval duration longer than the post-settlement lifespan
FIGURE 2. Adult Coryphopterus kuna from Utila, Honduras: 10.9 mm SL female (A and B); 13.3 mm SL male (C); 15.2 mm SL male (D); pelvic fin and probe under the frenum on 15.2 mm SL male (E).
Figure 3 in The larval, juvenile, and adult stages of the Caribbean goby, Coryphopterus kuna (Teleostei: Gobiidae): a reef fish with a pelagic larval duration longer than the post-settlement lifespan
Figure 3. Larvae and juvenile of Coryphopterus kuna: 7.1 mm SL (A), 8.0 mm SL (B), and 7.0 mm SL (C, lateral and dorsal view) larvae from Xcalak; 8.1 mm SL settled juvenile from Utila, Honduras (D, lateral and dorsal view). Head melanophores labeled following abbreviations in Table 1. (A) and (B) courtesy of José A. Cohúo.
FIGURE 1 in The larval, juvenile, and adult stages of the Caribbean goby, Coryphopterus kuna (Teleostei: Gobiidae): a reef fish with a pelagic larval duration longer than the post-settlement lifespan
FIGURE 1. The reported range of Kuna Gobies within the Caribbean (map by Robert Myers, Coral Graphics, reprinted with permission) (A); Live photographs from Utila, Gulf of Honduras (B); Guadeloupe in the Lesser Antilles (C); and San Andres, Colombia, an offshore island in the Western Caribbean (D); photos by Keri Wilk.
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