Could refuge theory and rivers acting as barriers explain the genetic variability distribution in the Atlantic Forest?

Cazé, Ana Luíza Ramos; Mäder, Geraldo; Nunes, Teonildes Sacramento; Queiroz, Luciano Paganucci de; Oliveira, Guilherme de; Diniz‐Filho, José Alexandre Felizola; Bonatto, Sandro L.; Freitas, Loreta B.

doi:10.1016/j.ympev.2016.05.013

Cited by 31 publications

(16 citation statements)

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“…The Guinea highlands are a source of some of West Africa’s largest rivers, including Niger, Gambia, and Senegal rivers. Evidence that rivers may function as barriers for gene dispersal in plant species is limited ( Cazé et al 2016 ; Nazareno et al 2017 ) and we do not expect they acted as a genetic barrier for P. biglobosa . On the contrary, big African rivers represent an important transport system and, consequently, they may have contributed to human-induced gene flow in plants.…”

Section: Discussionmentioning

confidence: 67%

Phylogeography of African Locust Bean (Parkia biglobosa) Reveals Genetic Divergence and Spatially Structured Populations in West and Central Africa

Lompo

Vinceti

Konrad

et al. 2018

Journal of Heredity

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The evolutionary history of African savannah tree species is crucial for the management of their genetic resources. In this study, we investigated the phylogeography of Parkia biglobosa and its modeled distribution under past and present climate conditions. This tree species is very valued and widespread in West Africa, providing edible and medicinal products. A large sample of 1610 individuals from 84 populations, distributed across 12 countries in Western and Central Africa, were genotyped using 8 nuclear microsatellites. Individual-based assignments clearly distinguished 3 genetic clusters, extreme West Africa (EWA), center of West Africa (CWA), and Central Africa (CA). Overall, estimates of genetic diversity were moderate to high, with lower values for populations in EWA (allelic richness after rarefaction [AR] = 6.4, expected heterozygosity [HE] = 0.78, and observed heterozygosity [HO] = 0.7) and CA (AR = 5.9, HE = 0.67, and HO = 0.61) compared with populations in CWA (AR = 7.3, HE = 0.79, and HO = 0.75). The overall population differentiation was found to be moderate (FST = 0.09). A highly significant isolation by distance pattern was detected, with a marked phylogeographic signature suggesting possible effects of past climate and geographic barriers to migration. Modeling the potential distribution of the species showed a contraction during the last glaciations followed by expansion events. The exploratory approximate Bayesian computation conducted suggests a best-supported scenario in which the cluster CWA traced back to the ancestral populations and a first split between EWA and CWA took place about 160000 years before present (BP), then a second split divided CA and CWA, about 100000 years BP. However, our genetic data do not enable us to conclusively distinguish among a few alternative possible scenarios.

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Section: Discussionmentioning

confidence: 67%

Phylogeography of African Locust Bean (Parkia biglobosa) Reveals Genetic Divergence and Spatially Structured Populations in West and Central Africa

Lompo

Vinceti

Konrad

et al. 2018

Journal of Heredity

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“…Further, it is highlighted in several biogeographic studies as a place of disjunction (Cazé et al., ; Menezes et al., ; Pinheiro et al., ) or secondary contact (Carnaval, Hickerson, Haddad, Rodrigues, & Moritz, ; Franco & Manfrin, ; Pellegrino, Rodrigues, Harris, Yonenaga‐Yassuda, & Sites, ). As these studies include different organisms with distinct dispersal capacities, such as flies (Franco & Manfrin, ), amphibians (Carnaval et al., ), lizards (Pellegrino et al., ), and plants (Cazé et al., ; Pinheiro et al., ), it is reasonable that asynchrony and recurrent events such as the climatic Pleistocene oscillations could explain some of these empirical observations. However, is also possible that only PRH is an insufficient model to explain all these biogeographic data obtained from groups that diversified in different time scales and in some cases predating the Pleistocene (Pellegrino et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…Different factors are proposed to explain phylogeographic patterns in BAF, including rivers (e.g., Cazé et al., ; Neto, Furtado, Zappi, Filho, & Forzza, ) and geological faults (Batalha‐Filho et al., ; Thomé, Zamudio, Haddad, & Alexandrino, ; Thomé et al., ) as putative geographic barriers. Further, Pleistocene climatic changes have also been invoked to explain diversification within BAF (e.g., Cabanne et al., ; Cardoso, Cristiano, Tavares, Schubart, & Heinze, ), by persistence of rainforest species in stable areas (refugia) in the northern bioclimatic region and expansion of open vegetation formation in the south (Carnaval et al., ).…”

Section: Introductionmentioning

confidence: 99%

The xeric side of the Brazilian Atlantic Forest: The forces shaping phylogeographic structure of cacti

Franco

Jojima

Perez

et al. 2017

Ecology and Evolution

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In order to investigate biogeographic influences on xeric biota in the Brazilian Atlantic Forest (BAF), a biodiversity hotspot, we used a monophyletic group including three cactus taxa as a model to perform a phylogeographic study: Cereus fernambucensis subsp. fernambucensis, C. fernambucensis subsp. sericifer, and C. insularis. These cacti are allopatric and grow in xeric habitats along BAF, including isolated granite and gneiss rock outcrops (Inselbergs), sand dune vegetation (Restinga forest), and the rocky shore of an oceanic archipelago (islands of Fernando de Noronha). The nucleotide information from nuclear gene phytochrome C and plastid intergenic spacer trnS‐trnG was used to perform different approaches and statistical analyses, comprising population structure, demographic changes, phylogenetic relationships, and biogeographic reconstruction in both spatial and temporal scales. We recovered four allopatric population groups with highly supported branches in the phylogenetic tree with divergence initiated in the middle Pleistocene: southern distribution of C. fernambucensis subsp. fernambucensis, northern distribution of C. fernambucensis subsp. fernambucensis together with C. insularis, southern distribution of C. fernambucensis subsp. sericifer, and northern distribution of C. fernambucensis subsp. sericifer. Further, the results suggest that genetic diversity of population groups was strongly shaped by an initial colonization event from south to north followed by fragmentation. The phylogenetic pattern found for C. insularis is plausible with peripatric speciation in the archipelago of Fernando de Noronha. To explain the phylogeographic patterns, the putative effects of both climatic and sea level changes as well as neotectonic activity during the Pleistocene are discussed.

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“…In plants, higher genetic diversity has been frequently found in zones that had a stable climate during glacial periods and for which post-glacial migration was identified (Faye et al, 2016; Wolfe et al, 2016), and in contrast, unstable regions are expected to represent recently colonized areas and thus exhibit lower genetic diversity (Abellán & Svenning, 2014; Caze et al, 2016; Ornelas, Licona-Vera & Vásquez-Aguilar, 2018). Higher genetic diversity has been found as well in environments that fluctuate in time or space, in which different genotypes can be favored at different times or locations and shifting selection can support higher genetic variation in fitness, even when stabilizing selection is acting to reduce genetic variation (Nadeau, Urban & Bridle, 2017).…”

Section: Discussionmentioning

confidence: 99%

Climate change and conservation in a warm North American desert: effect in shrubby plants

Sosa

Loera

Angulo

et al. 2019

PeerJ

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Background Deserts are biologically rich habitats with a vast array of animals and plants adapted to xeric conditions, and most deserts are among the planet’s last remaining areas of total wilderness. Among North American deserts, the Chihuahuan Desert has the highest levels of diversity and endemism. To understand the effect of future climate change on plants distributed in this arid land and propose effective conservation planning, we focused on five endemic shrubby species that characterize the Chihuahuan Desert and used an integrative approach. Methods Ecological niche-based modeling, spatial genetics and ecological resistance analyses were carried out to identify the effect of global warming on the studied five shrubby species. Key areas that need to be preserved were identified taking into account the existing protected areas within the Chihuahuan Desert. Results The extent of future distribution will vary among these species, and on average expansion will occur in the western part of the Chihuahuan Desert. For most species low environmental resistance to gene flow was predicted, while higher future resistance was predicted for one species that would lead to increased population isolation. The highest haplotype diversity was identified in three hotspots. Based on future suitability of habitat and in the haplotype diversity we suggest preserving two hotspots of genetic diversity in the Sierra Madre Oriental, located in areas without protection. The third hotspot was detected in the well preserved Tehuacán-Cuicatlán Man and Biosphere Reserve. Conclusion Global climate change will have an effect in arid adapted plants, favoring expansion in the western of the Chihuahuan Desert however negatively affecting others with high ecological resistance disrupting gene flow. Two hotspots of genetic diversity in the Sierra Madre Oriental should be protected.

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Could refuge theory and rivers acting as barriers explain the genetic variability distribution in the Atlantic Forest?

Cited by 31 publications

References 95 publications

Phylogeography of African Locust Bean (Parkia biglobosa) Reveals Genetic Divergence and Spatially Structured Populations in West and Central Africa

Phylogeography of African Locust Bean (Parkia biglobosa) Reveals Genetic Divergence and Spatially Structured Populations in West and Central Africa

The xeric side of the Brazilian Atlantic Forest: The forces shaping phylogeographic structure of cacti

Climate change and conservation in a warm North American desert: effect in shrubby plants

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