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7 results for “Juvenile recruitment”
Data from: Ageing of juvenile coral grouper (Plectropomus maculatus) reveals year-round spawning and recruitment: Implications for seasonal closures
<p>Temporal patterns in spawning and juvenile recruitment can have major effects on population size and the demographic structure of coral reef fishes. For harvested species, these patterns are crucial in determining stock size and optimising management strategies such as seasonal closures. For the commercially important coral grouper (<em>Plectropomus</em> spp.) on the Great Barrier Reef, histological studies indicate peak spawning around the summer new moons. Here we examine the timing of spawning activity for <em>P. maculatus</em> in the southern Great Barrier Reef by deriving age in days for 761 juvenile fish collected between 2007 and 2022, and back-calculating settlement and spawning dates. Age-length relationships were used to estimate spawning and settlement times for a further 1,002 juveniles collected over this period. Unexpectedly, our findings indicate year-round spawning activity generates distinct recruitment cohorts that span several weeks to months. Peak spawning varied between years with no clear association with environmental cues, and little to no alignment with existing seasonal fisheries closures around the new moon. Given the variability and uncertainty in peak spawning times, this fishery may benefit from additional and longer seasonal closures, or alternative fisheries management strategies, to maximise the recruitment contribution from periods of greatest reproductive success.</p>
Data from: Ageing of juvenile coral grouper (Plectropomus maculatus) reveals year-round spawning and recruitment: Implications for seasonal closures
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Data from: Benefits of turbid river plume habitat for Lake Erie yellow perch (Perca flavescens) recruitment determined by juvenile to larval genotype assignment
Nutrient-rich, turbid river plumes that are common to large lakes and coastal marine ecosystems have been hypothesized to benefit survival of fish during early life stages by increasing food availability and (or) reducing vulnerability to visual predators. However, evidence that river plumes truly benefit the recruitment process remains meager for both freshwater and marine fishes. Here, we use genotype assignment between juvenile and larval yellow perch (Perca flavescens) from western Lake Erie to estimate and compare recruitment to the age-0 juvenile stage for larvae residing inside the highly turbid, south-shore Maumee River plume versus those occupying the less turbid, more northerly Detroit River plume. Bayesian genotype assignment of a mixed assemblage of juvenile (age-0) yellow perch to putative larval source populations established that recruitment of larvae was higher from the turbid Maumee River plume than for the less turbid Detroit River plume during 2006 and 2007, but not in 2008. Our findings add to the growing evidence that turbid river plumes can indeed enhance survival of fish larvae to recruited life stages, and also demonstrate how novel population genetic analyses of early life stages can contribute to determining critical early life stage processes in the fish recruitment process.
Diurnal pastoralism does not reduce juvenile recruitment nor elevate allostatic load in spotted hyenas
<p>1. Anthropogenic activity can have substantial effects on wildlife. These effects may vary according to the characteristics of the activity and the species involved. While effects on behavior are well-studied, studies of effects on fitness and physiology are scarce, particularly for group-living species.</p> <p>2. We exploited a natural experimental setup to investigate the effect of diurnal pastoralism on juvenile recruitment and allostatic load in a population of free-ranging spotted hyenas in the Ngorongoro Crater, Tanzania, over a 24-year period.</p> <p>3. Pastoralism was restricted to the territories of two of the eight study clans, allowing us to compare juvenile recruitment in exposed and unexposed clans. We also compared fecal glucocorticoid metabolite concentrations (fGMC) – a biomarker of an organism's allostatic load – between exposed and unexposed clans using 975 fecal samples from 475 hyenas.</p> <p>4. We found no detectable difference in juvenile recruitment nor fGMC between the exposed and unexposed clans, indicating that the pastoralism had no substantial deleterious effect on the spotted hyenas. The lack of a deleterious effect likely stems from the combined effect of the predictable and undisruptive nature of the pastoralism, the socio-ecology of spotted hyenas, and the Ngorongoro Crater's consistently abundant prey.</p> <p>5. Our findings demonstrate that exposure to anthropogenic activity may be compatible with the persistence of certain group-living species, especially if the overlap between the species' critical behaviors and the activity is limited. Our study thereby provides new perspectives for ecologists, conservation biologists, and stakeholders who seek to assess human-wildlife conflicts and balance the needs of local human communities and wildlife.</p>
Data from: Understanding the recruitment response of juvenile Neotropical trees to logging intensity using functional traits
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Diurnal pastoralism does not reduce juvenile recruitment nor elevate allostatic load in spotted hyenas
Open the record for dataset details and reuse information.
Data from: Benefits of turbid river plume habitat for Lake Erie yellow perch (Perca flavescens) recruitment determined by juvenile to larval genotype assignment
Open the record for dataset details and reuse information.
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OpenNeuro
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