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37 results for “Reef resilience”
Figure 7 in Substratum stability and coral reef resilience: insights from 90 years of disturbances on a reef in American Samoa
Figure 7. Acropora muricata colony having stability by being wedged into the loose substratum.
Figure 5 in Substratum stability and coral reef resilience: insights from 90 years of disturbances on a reef in American Samoa
Figure 5. Density of Acropora spp. along the Aua transect from 1917 to 2007.
Figure 6 in Substratum stability and coral reef resilience: insights from 90 years of disturbances on a reef in American Samoa
Figure 6. Acropora nana recruited abundantly to the solid reef crest in the late 1990s.
Figure 4 in Substratum stability and coral reef resilience: insights from 90 years of disturbances on a reef in American Samoa
Figure 4. Density of Porites cylindrica colonies along the Aua transect from 1917 to 2007.
Data for: Seasonal variability in resilience of a coral reef fish to marine heatwaves and hypoxia
<p>Climate change projections indicate more frequent and severe tropical marine heatwaves (MHWs) and accompanying hypoxia year-round. However, most studies have focused on peak summer peak conditions under the assumption that annual maximum temperatures will induce the greatest physiological consequences. This study challenges this idea by characterizing seasonal MHWs (i.e., mean, maximum, and cumulative intensities, durations, heating rates, and mean annual occurrence) and comparing metabolic traits (i.e., standard metabolic rate (SMR), Q10 of SMR, maximum metabolic rate (MMR), aerobic scope, and critical oxygen tension (<em>P</em><sub>crit</sub>)) of winter- and summer-acclimatized convict tang (<em>Acanthurus</em> <em>triostegus</em>) to the combined effects of MHWs and hypoxia. Fish were exposed to one of six MHW treatments with seasonally varying maximum intensities (winter: 24.5, 26.5, 28.5°C; summer: 28.5, 30.5, 32.5°C), representing past and future MHWs under IPCC projections (i.e., +0, +2, +4°C). Surprisingly, MHW characteristics did not significantly differ between seasons, yet SMR was more sensitive to winter MHWs (mean Q10 = 2.92) than summer MHWs (mean Q10 = 1.81), despite higher absolute summer temperatures. Concurrently, MMR increased similarly among winter +2°C and +4°C treatments (i.e., 26.5, 28.5°C) and all summer MHW treatments, suggesting a ceiling for maximal MMR increase. Aerobic scope did not significantly differ between seasons nor among MHW treatments. While mean <em>P</em><sub>crit</sub> did not significantly vary between seasons, warming of +4°C during winter (i.e., 28.5°C) significantly increased <em>P</em><sub>crit</sub> relative to the winter control group. Contrary to the idea of increased sensitivity to MHWs during the warmest time of year, our results reveal heightened sensitivity to the deleterious effects of winter MHWs, and that seasonal acclimatization to warmer summer conditions may bolster metabolic resilience to warming and hypoxia. Consequently, physiological sensitivity to MHWs and hypoxia may extend across larger parts of the year than previously expected, emphasizing the importance of evaluating climate change impacts during cooler seasons when essential fitness-related traits such as reproduction occur in many species.</p>
Code and data for: Setting sustainable limits on anchoring to improve the resilience of coral reefs
<p>This dataset relates to the journal article: Mason, R. A. B., Bozec, Y.-M., Mumby, P. J. (2023) "Setting sustainable limits on anchoring to improve the resilience of coral reefs" <em>Marine Pollution Bulletin</em> 189: 114721 and is comprised of the following components:</p> <p>- The code and data used to perform the modelling that is described in the journal article. </p> <p>- The data outputs that resulted from running the code.</p> <p>- The code used to make figures using these data outputs, which are illustrated in the journal article</p>
Persistence of tropical herbivores in temperate reefs constrain kelp resilience to cryptic habitats
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Data for: Seasonal variability in resilience of a coral reef fish to marine heatwaves and hypoxia
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Data from: Demographic plasticity facilitates ecological and economic resilience in a commercially important reef fish
1. Variation in life-history characteristics is evident within and across animal populations. Such variation is mediated by environmental gradients and reflects metabolic constraints or trade-offs that enhance reproductive outputs. While generalizations of life-history relationships across species provide a framework for predicting vulnerability to overexploitation, deciphering patterns of intraspecific variation may also enable recognition of peculiar features of populations that facilitate ecological resilience. 2. This study combines age-based biological data from geographically disparate populations of bluespine unicornfish (Naso unicornis)—the most commercially-valuable reef-associated species in the insular Indo-Pacific—to explore the magnitude and drivers of variation in life span and examine the mechanisms enabling peculiar mortality schedules. 3. Longevity and mortality schedules were investigated across eleven locations encompassing a range of latitudes and exploitation levels. The presence of different growth types was examined using back-calculated growth histories from otoliths. Growth-type dependent mortality (mortality rates associated with particular growth trajectories) was corroborated using population models that incorporated size-dependent competition. 4. We found a threefold geographic variation in life span that was strongly linked to temperature, but not to anthropogenic pressure or ocean productivity. All populations consistently displayed a two-phase mortality schedule, with higher than expected natural mortality rates in earlier stages of post-settlement life. Reconstructed growth histories and population models demonstrated that variable growth types within populations can yield this peculiar biphasic mortality schedule, where fast growers enjoy early reproductive outputs at the expense of greater mortality, and benefits for slow growers derive from extended reproductive outputs over a greater number of annual cycles. This promotes population resilience because individuals can take advantage of cycles of environmental change operating at both short and long-term scales. 5. Our results highlight a prevailing, fundamental misperception when comparing the life histories of long-lived tropical ectotherms: the seemingly incongruent combination of extended life spans with high mortality rates was enabled by coexistence of variable growth types in a population. Thus a demographic profile incorporating contrasting growth and mortality strategies obscures the demographic effects of harvest across space or time in N. unicornis and possibly other ectotherms with the combination of longevity and asymptotic growth.
Data from: Ecologically relevant dispersal of corals on isolated reefs: implications for managing resilience
Coral reefs are in decline worldwide, and marine reserve networks have been advocated as a powerful management tool for maximizing the resilience of coral communities to an increasing variety, number, and severity of disturbances. However, the effective design of reserves must account for the spatial scales of larval dispersal that affect the demography of communities over ecological time frames. Ecologically relevant distances of dispersal were inferred from DNA microsatellite data in a broadcast-spawning (Acropora tenuis) and a brooding (Seriatopora hystrix) coral at isolated reef systems off northwest Australia. Congruent with expectations based on life histories, levels of genetic subdivision among populations were markedly higher in the brooder than in the broadcast spawner. Additionally, significant subdivision for both species between systems (>100 km), and between (>10 km) or within reefs (<10 km) within systems, indicated that many reefs or reef patches are demographically independent. There was also a clear distinction in the scale of genetic structure between the different systems; at the more geographically complex of the systems, a much finer scale structure was detected in both species. This suggested that the hydrodynamics associated with these complex reefs restrict distances regularly traveled by larvae. The primary implication is that short-term recovery of these coral communities after severe disturbance requires the input of larvae from viable communities kilometers to a few tens of kilometers away. Therefore, to be self-sustaining, we suggest that coral reef protected areas need to be large enough to encompass these routine dispersal distances. Further, to facilitate recovery from severe disturbances, protected areas need to be replicated over these spatial scales. However, specific designs also need to account for size, complexity, and isolation of reefs, which will either restrict or enhance dispersal within this range.
Recovery and Resilience of Oyster Reefs in the Big Bend of Florida - Oyster transect count data
<p>These data represent counts of live and dead oysters from line-transect surveys used to evaluate status and trends in intertidal Eastern Oyster (“oyster”) reefs in the Suwannee Sound region of the northeastern Gulf of Mexico. For details on methods and example application see Moore et al. 2020.</p>
Data from: Coral reef state influences resilience to acute climate-mediated disturbances
<p>Aim: Understand the interplay between resistance and recovery on coral reefs, and investigate dependence on pre- and post-disturbance states, to inform generalisable reef resilience theory across large spatial and temporal scales.</p> <p>Location: Tropical coral reefs globally.</p> <p>Time period: 1966 to 2017.</p> <p>Major taxa studied: Scleratinian hard corals.</p> <p>Methods: We conducted a literature search to compile a global dataset of total coral cover before and after acute storms, temperature stress, and coastal runoff from flooding events. We used meta-regression to identify variables that explained significant variation in disturbance impact, including disturbance type, year, depth, and pre-disturbance coral cover. We further investigated the influence of these same variables, as well as post-disturbance coral cover and disturbance impact, on recovery rate. We examined the shape of recovery, assigning qualitatively distinct, ecologically relevant, population growth trajectories: linear, logistic, logarithmic (decelerating), and a second-order quadratic (accelerating).</p> <p>Results: We analysed 427 disturbance impacts and 117 recovery trajectories. Accelerating and logistic were the most common recovery shapes, underscoring non-linearities and recovery lags. A complex but meaningful relationship between the state of a reef pre- and post-disturbance, disturbance impact magnitude, and recovery rate was identified. Fastest recovery rates were predicted for intermediate to large disturbance impacts, but a decline in this rate was predicted when more than ~75% of pre-disturbance cover was lost. We identified a shifting baseline, with declines in both pre-and post-disturbance coral cover over the 50 year study period.</p> <p>Main conclusions: We breakdown the complexities of coral resilience, showing interplay between resistance and recovery, as well as dependence on both pre- and post-disturbance states, alongside documenting a chronic decline in these states. This has implications for predicting coral reef futures and implementing actions to enhance resilience.</p>
Data from: Interactive effects of predator and prey harvest on ecological resilience of rocky reefs
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Data from: Coral reef state influences resilience to acute climate-mediated disturbances
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Data from: Ecologically relevant dispersal of corals on isolated reefs: implications for managing resilience
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Data from: Mechanisms of resilience: empirically quantified positive feedbacks produce alternate stable states dynamics in a model of a tropical reef
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Data from: Demographic plasticity facilitates ecological and economic resilience in a commercially important reef fish
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OpenNeuro
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