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32 results for “coral recruit”
Data from: Spatial patterns of self-recruitment of a coral reef fish in relation to island-scale retention mechanisms
Oceanographic features influence the transport and delivery of marine larvae, and physical retention mechanisms, such as eddies, can enhance self-recruitment (i.e. the return of larvae to their natal population). Knowledge of exact locations of hatching (origin) and settlement (arrival) of larvae of reef animals provides a means to compare observed patterns of self-recruitment 'connectivity' with those expected from water circulation patterns. Using parentage inference based on multiple sampling years in Moorea, French Polynesia, we describe spatial and temporal variation in self-recruitment of the anemonefish Amphiprion chrysopterus, evaluate the consistency of net dispersal distances of self-recruits against the null expectation of passive particle dispersal and test the hypothesis that larvae originating in certain reef habitats (lagoons and passes) would be retained and thus more likely to self-recruit than those originating on the outer (fore) reef. Estimates of known self-recruitment were consistent across the sampling years (~25–27% of sampled recruits). For most (88%) of these self-recruits, the net distance between hatching and settlement locations was within the maximum dispersal distance expected for a neutrally buoyant passive particle based on the longest duration of the larval dispersive phase and the average direction and speed of current flow around Moorea. Furthermore, a parent of a given body size on the outer (fore) reef of Moorea was less likely to produce self-recruits than those in passes. Our findings show that even a simple dispersal model based on net average flow and direction of alongshore currents can provide insight into landscape-scale retention patterns of reef fishes.
Data from: Seascape and life-history traits do not predict self-recruitment in a coral reef fish
The persistence and resilience of many coral reef species are dependent on rates of connectivity among sub-populations. However, despite increasing research efforts, the spatial scale of larval dispersal remains unpredictable for most marine metapopulations. Here, we assess patterns of larval dispersal in the angelfish Centropyge bicolor in Kimbe Bay, Papua New Guinea, using parentage and sibling reconstruction analyses based on 23 microsatellite DNA loci. We found that, contrary to previous findings in this system, self-recruitment (SR) was virtually absent at both the reef (0.4–0.5% at 0.15 km2) and the lagoon scale (0.6–0.8% at approx. 700 km2). While approximately 25% of the collected juveniles were identified as potential siblings, the majority of sibling pairs were sampled from separate reefs. Integrating our findings with earlier research from the same system suggests that geographical setting and life-history traits alone are not suitable predictors of SR and that high levels of localized recruitment are not universal in coral reef fishes.
Multiscale variability in coral recruitment in the Mascarene Islands: from centimetric to geographical scale (dataset)
<p>Dataset of coral recruitment rates assessed on artificial tiles at Rodrigues and Reunion islands (Mascarene Archipelago) associated to the article: Multiscale variability in coral recruitment in the Mascarene Islands: from centimetric to geographical scale (DOI: 10.1371/journal.pone.0214163)</p> <p>P1: period 1, i.e. summer 2015–2016 (October 2015–March 2016); P2: winter 2016 (April–September 2016); P3: summer 2016–2017 (October 2016–March 2017).</p> <p>Site codes: SS: Sanctuaire Sud; SB: Souris Blanche; VS: Varangue Sud; MA: Marine; IF: Ile aux Fous; RB: Rivière Banane; MO: Mourouk; PE: Port Sud-Est.</p> <p>Position of recruits on the different surfaces of the tiles are filled in.</p>
Data from: Additive negative effects of anthropogenic sedimentation and warming on the survival of coral recruits
Corals worldwide are facing population declines due to global climate change and local anthropogenic impacts. Global climate change effects are hard to tackle but recent studies show that some coral species can better handle climate change stress when provided with additional energy resources. The local stressor that most undermines energy acquisition is sedimentation because it impedes coral heterotrophic feeding and their ability to photosynthesize. To investigate if reducing local sedimentation will enable corals to better endure ocean warming, we quantitatively assessed the combined effects of increased temperature and sedimentation (concentration and turbidity) on the survival of coral recruits of the species, Porites astreoides. We used sediment from a reef and a boat basin to mimic natural sediment (coarse) and anthropogenic (fine) sediment (common in dredging), respectively. Natural sediment did not negatively impact coral survival, but anthropogenic sediment did. We found that the capacity of coral recruits to survive under warmer temperatures is less compromised when anthropogenic sedimentation is maintained at the lowest level (30 mg.cm−2). Our study suggests that a reduction of US-EPA allowable turbidity from 29 Nephelometric Turbidity Units (NTU) above background to less than 7 NTU near coral reefs would facilitate coral recruit survival under current and higher temperatures.
Data from: Larval dispersal and fishing pressure influence recruitment in a coral reef fishery
<ol> <li><span>Understanding larval connectivity patterns in exploited fishes is a fundamental prerequisite for developing effective management strategies and assessing the vulnerability of a fishery to recruitment overfishing and localised extinction. To date however, researchers have not considered how regional variations in fishing pressure also influence recruitment. </span></li> <li><span>We used genetic parentage analyses and modelling to infer the dispersal patterns of bumphead parrotfish (<i>Bolbometopon muricatum</i>) larvae in the Kia fishing grounds, Isabel Province, Solomon Islands. We then extrapolated our Kia dispersal model to a regional scale by mapping the available nursery and adult habitat for <i>B. muricatum</i> in six regions in the western Solomon Islands, and estimated the relative abundance of adult <i>B. muricatum</i> populations in each of these regions based on available adult habitat and historical and current fishing pressure. </span></li> <li><span><span>Parentage analysis identified 67 juveniles that were the offspring of parents sampled in the Kia fishing grounds. A </span>fitted larval dispersal kernel<span> predicted that 50% of larvae settled within 30 km of their parents, and 95% settled within 85 km of their parents. After accounting for unsampled adults, our model predicted that 34% of recruitment to the Kia fishery was spawned locally. Extrapolating the spatial resolution of the model revealed that a high proportion of the larvae recruiting into the Kia fishing grounds came from nearby regions that had abundant adult populations. </span>Other islands in the archipelago provided few recruits to the Kia fishing grounds, reflecting the greater distances to these islands and lower adult abundances in some regions. </span></li> <li> <em>Synthesis and <a>applications</a></em><em>: </em>This study shows how recruitment into a commercial reef fishery is influenced by larval dispersal patterns and regional variations in historical fishing pressure. The scales of larval connectivity observed for <i>B. muricatum</i> indicate that recruitment overfishing is unlikely if there are lightly exploited reefs up to 85 km away from a heavily fished region, and that small marine protected areas (MPAs) are insufficient to protect this species. We recommend greater efforts to understand the interactions between larval dispersal and gradients of fishing pressure, as this will enable the development of tailored fisheries management <a>strategies.</a> </li> </ol>
Data from: Low recruitment due to altered settlement substrata as primary constraint for coral communities under ocean acidification
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Data from: Additive negative effects of anthropogenic sedimentation and warming on the survival of coral recruits
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Data from: Seascape and life-history traits do not predict self-recruitment in a coral reef fish
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Sedimentation and overfishing drive changes in early succession and coral recruitment (Palau, Micronesia)
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Data from: Larval dispersal and fishing pressure influence recruitment in a coral reef fishery
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Data from: Spatial patterns of self-recruitment of a coral reef fish in relation to island-scale retention mechanisms
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Data from: Characterising the ecological trade-offs throughout the early ontogeny of coral recruitment
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