Mangrove forests in a rapidly changing world: Global change impacts and conservation opportunities along the Gulf of Mexico coast

Osland, Michael J.; Feher, Laura C.; López‐Portillo, Jorge; Day, Richard H.; Suman, Daniel O.; Menéndez, José Manuel Guzmán; Rivera‐Monroy, Victor H.

doi:10.1016/j.ecss.2018.09.006

Cited by 103 publications

(70 citation statements)

References 237 publications

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“…, Osland et al. ). In response to these many different aspects of global change, some mangrove forests are expected to adapt in place and some are expected to move to new locations.…”

Section: Discussionmentioning

confidence: 99%

Rapid peat development beneath created, maturing mangrove forests: ecosystem changes across a 25‐yr chronosequence

Osland

Feher

Spivak

et al. 2020

Ecological Applications

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2020. Rapid peat development beneath created, maturing mangrove forests: ecosystem changes across a 25-yr chronosequence. Ecological Applications 30(4):Abstract. Mangrove forests are among the world's most productive and carbon-rich ecosystems. Despite growing understanding of factors controlling mangrove forest soil carbon stocks, there is a need to advance understanding of the speed of peat development beneath maturing mangrove forests, especially in created and restored mangrove forests that are intended to compensate for ecosystem functions lost during mangrove forest conversion to other land uses. To better quantify the rate of soil organic matter development beneath created, maturing mangrove forests, we measured ecosystem changes across a 25-yr chronosequence. We compared ecosystem properties in created, maturing mangrove forests to adjacent natural mangrove forests. We also quantified site-specific changes that occurred between 2010 and 2016. Soil organic matter accumulated rapidly beneath maturing mangrove forests as sandy soils transitioned to organic-rich soils (peat). Within 25 yr, a 20-cm deep peat layer developed. The time required for created mangrove forests to reach equivalency with natural mangrove forests was estimated as (1) <15 yr for herbaceous and juvenile vegetation, (2)~55 yr for adult trees, (3) 25 yr for the upper soil layer (0-10 cm), and (4)~45-80 yr for the lower soil layer (10-30 cm). For soil elevation change, the created mangrove forests were equivalent to or surpassed natural mangrove forests within the first 5 yr. A comparison to chronosequence studies from other ecosystems indicates that the rate of soil organic matter accumulation beneath maturing mangrove forests may be among the fastest globally. In most peatland ecosystems, soil organic matter formation occurs slowly (over centuries, millennia); however, these results show that mangrove peat formation can occur within decades. Peat development, primarily due to subsurface root accumulation, enables mangrove forests to sequester carbon, adjust their elevation relative to sea level, and adapt to changing conditions at the dynamic land-ocean interface. In the face of climate change and rising sea levels, coastal managers are increasingly concerned with the longevity and functionality of coastal restoration efforts. Our results advance understanding of the pace of ecosystem development in created, maturing mangrove forests, which can improve predictions of mangrove forest responses to global change and ecosystem restoration.

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“…, Osland et al. ). In response to these many different aspects of global change, some mangrove forests are expected to adapt in place and some are expected to move to new locations.…”

Section: Discussionmentioning

confidence: 99%

Rapid peat development beneath created, maturing mangrove forests: ecosystem changes across a 25‐yr chronosequence

Osland

Feher

Spivak

et al. 2020

Ecological Applications

Self Cite

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“…We can also presume that these three coastlines experienced similar historical distributional fluctuations, as the present-day USA mangrove distribution is thought to be the product of complete eradication at the Last Glacial Maximum, with retraction towards the equator, and subsequent Post-Pleistocene recolonization (Sherrod & McMillan, 1985; also see descriptions in Osland et al, 2018;Rogers & Krauss, 2018;Saintilan, Wilson, Rogers, Rajkaran, & Krauss, 2014).…”

Section: F I G U R E 1 Evaluation Of the Central-marginal Hypothesismentioning

confidence: 96%

Is the central‐marginal hypothesis a general rule? Evidence from three distributions of an expanding mangrove species, Avicennia germinans (L.) L

et al. 2020

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The central‐marginal hypothesis (CMH) posits that range margins exhibit less genetic diversity and greater inter‐population genetic differentiation compared to range cores. CMH predictions are based on long‐held “abundant‐centre” assumptions of a decline in ecological conditions and abundances towards range margins. Although much empirical research has confirmed CMH, exceptions remain almost as common. We contend that mangroves provide a model system to test CMH that alleviates common confounding factors and may help clarify this lack of consensus. Here, we document changes in black mangrove (Avicennia germinans) population genetics with 12 nuclear microsatellite loci along three replicate coastlines in the United States (only two of three conform to underlying “abundant‐centre” assumptions). We then test an implicit prediction of CMH (reduced genetic diversity may constrain adaptation at range margins) by measuring functional traits of leaves associated with cold tolerance, the climatic factor that controls these mangrove distributional limits. CMH predictions were confirmed only along the coastlines that conform to “abundant‐centre” assumptions and, in contrast to theory, range margin A. germinans exhibited functional traits consistent with greater cold tolerance compared to range cores. These findings support previous accounts that CMH may not be a general rule across species and that reduced neutral genetic diversity at range margins may not be a constraint to shifts in functional trait variation along climatic gradients.

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“…This has resulted in increasingly fragmented and degraded mangrove forests globally (Hamilton & Casey, ) – thus reducing connectivity – but it remains to be studied to what extent this affects population persistence. Climate change will pose additional threats such as sea‐level rise, changes in regional precipitation and temperature regimes, and the increased frequency and intensity of climate phenomena such as those generated by the El Niño Southern Oscillation (Gilman et al , ; Krauss et al , ; Alongi, ; Lovelock et al , , ; Ward et al , ; Osland et al , ). The potential of mangroves to adjust their phenotype to new conditions via acclimation and local adaptation is largely unknown.…”

Section: Introductionmentioning

confidence: 99%

A general framework for propagule dispersal in mangroves

et al. 2019

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Dispersal allows species to shift their distributions in response to changing climate conditions. As a result, dispersal is considered a key process contributing to a species' long-term persistence. For many passive dispersers, fluid dynamics of wind and water fuel these movements and different species have developed remarkable adaptations for utilizing this energy to reach and colonize suitable habitats. The seafaring propagules (fruits and seeds) of mangroves represent an excellent example of such passive dispersal. Mangroves are halophytic woody plants that grow in the intertidal zones along tropical and subtropical shorelines and produce hydrochorous propagules with high dispersal potential. This results in exceptionally large coastal ranges across vast expanses of ocean and allows species to shift geographically and track the conditions to which they are adapted. This is particularly relevant given the challenges presented by rapid sea-level rise, higher frequency and intensity of storms, and changes in regional precipitation and temperature regimes. However, despite its importance, the underlying drivers of mangrove dispersal have typically been studied in isolation, and a conceptual synthesis of mangrove oceanic dispersal across spatial scales is lacking. Here, we review current knowledge on mangrove propagule dispersal across the various stages of the dispersal process. Using a general framework, we outline the mechanisms and ecological processes that are known to modulate the spatial patterns of mangrove dispersal. We show that important dispersal factors remain understudied and that adequate empirical data on the determinants of dispersal are missing for most mangrove species. This review particularly aims to provide a baseline for developing future research agendas and field campaigns, filling current knowledge gaps and increasing our understanding of the processes that shape global mangrove distributions.

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Mangrove forests in a rapidly changing world: Global change impacts and conservation opportunities along the Gulf of Mexico coast

Cited by 103 publications

References 237 publications

Rapid peat development beneath created, maturing mangrove forests: ecosystem changes across a 25‐yr chronosequence

Rapid peat development beneath created, maturing mangrove forests: ecosystem changes across a 25‐yr chronosequence

Is the central‐marginal hypothesis a general rule? Evidence from three distributions of an expanding mangrove species, Avicennia germinans (L.) L

A general framework for propagule dispersal in mangroves

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