The Biological Flora of Coastal Dunes and Wetlands:<i>Avicennia germinans</i>(L.) L.

Lonard, Robert I.; Judd, Frank W.; Summy, Kenneth R.; DeYoe, Hudson R.; Stalter, Richard

doi:10.2112/jcoastres-d-16-00013.1

Cited by 23 publications

(24 citation statements)

References 144 publications

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“…Black mangrove, Avicennia germinans (L.) L., is widespread throughout the Neotropics and the predominant mangrove species at range margins in the United States (USA) (Lonard, Judd, Summy, DeYoe, & Stalter, ), in part because of its greater freeze tolerance compared to co‐occurring mangrove species (Cavanaugh et al, ). In the USA, A. germinans is present along the coastlines of Texas‐Louisiana, West Florida, and East Florida; three natural replicates of core to margin distribution ranges (Figure ).…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Satellite imagery has informed several studies ( Ramirez-Garcia, Lopez-Blanco & Ocana, 1998 ; Murray et al, 2003 ; Matsushita et al, 2007 ; Lee & Yeh, 2009 ; Shih et al, 2011a ; Shih et al, 2011b ; George et al, 2018 ) that have examined the reach of wetland vegetation and have assessed the relationship between mangrove distribution and coastal changes (Allison & Lee, 2004; Fromard et al, 2004; Nakamura et al, 2004; Shih et al, 2011a ; Shih et al, 2011b ; Lonard et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of mangrove removal on benthic organisms in the Siangshan Wetland in Hsinchu, Taiwan

Chu

Wei

Shih

2018

PeerJ

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Mangrove degradation is a well-documented trend, but the spread of mangroves within the Siangshan Wetland in Hsinchu, Taiwan, runs contrary to that trend. The spread of mangroves changes the structure and functions of habitats for benthic organisms, causes infilling of estuaries and flooding and creates breeding grounds for small black mosquitoes. A large-scale mangrove-removal project was undertaken by the Hsinchu City Government from October 2015 to March 2016. They also investigated the consequences of mangrove removal on benthic organisms and adjacent habitats from October 2015 to September 2016, and the density, species count, Shannon–Wiener index (H′), and Pielou’s evenness index (J′) of the mangrove and non-mangrove regions were compared. In this study, we used satellite telemetry images to monitor fluctuations in mangrove density from 2006 to 2016. The non-mangrove region exhibited more variations than the mangrove region. After mangrove removal, species returned to their original habitats and noteworthy biological values significantly increased in the mangrove regions. This study presents evidence to argue that mangrove removal benefits benthic organisms. The results indicate that mangrove removal can be an appropriate habitat rehabilitation strategy for benthic organisms. The ecological findings of this study can inform coastal managers or other officials who seek to steward mangrove biomass.

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“…Neotropical black mangrove, Avicennia germinans, is the predominant mangrove species at the Atlantic Florida range margin (Lonard et al, 2017). Range margin populations of A. germinans exhibit clear genetic differences from those directly south within the continuous range core (Kennedy et al, 2020b) and are the predominant source of new recruits to northern areas beyond this species' present-day distribution (Kennedy et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Genetically based adaptive trait shifts at an expanding mangrove range margin

et al. 2022

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Neotropical black mangrove (Avicennia germinans) is expanding poleward into temperate salt marsh along Atlantic Florida, USA, with field evidence of trait shifts consistent with greater cold tolerance within range margin populations. However, whether these shifts have a genetic basis remains unanswered. To address this gap, we measured multiple phenotypic traits of twenty A. germinans maternal cohorts from areas in both the Atlantic Florida range core and margin in a 2-year greenhouse common garden with annual temperatures analogous to range margin conditions. Compared to those from the range core, range margin cohorts survived in greater numbers, established (i.e., produced first true leaves) more quickly, and were less stressed under winter temperatures. Range margin cohorts were not taller, but invested more into lateral growth and biomass accumulation that presumably reflects adaptation to their colder and open-canopy environment. Range margin cohorts also exhibited leaf traits consistent with greater resource acquisition that may compensate for a shorter growing season and reduced light quality at higher latitude. Our results suggest that genetically based phenotypic differences better enable these range margin mangroves to thrive within their stressful environment and may facilitate further poleward expansion. An improved understanding of adaptive trait variation within ecologically important mangrove foundation species should also help inform coastal restoration initiatives.

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The Biological Flora of Coastal Dunes and Wetlands:Avicennia germinans(L.) L.

Cited by 23 publications

References 144 publications

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

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

Effects of mangrove removal on benthic organisms in the Siangshan Wetland in Hsinchu, Taiwan

Genetically based adaptive trait shifts at an expanding mangrove range margin

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