Intermittent development of forest corridors in northeastern Brazil during the last deglaciation: Climatic and ecologic evidence

Bouimetarhan, Ilham; Chiessi, Cristiano Mazur; González‐Arango, Catalina; Dupont, Lydie M; Voigt, Ines; Prange, Matthias; Zonneveld, Karin A F

doi:10.1016/j.quascirev.2018.05.026

Cited by 35 publications

(25 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Another possibility is that the arboreal Caatinga is reminiscent of seasonal forests that covered a larger area in the Brazilian semiarid region during the Pleistocene, and wetter phases in the Holocene (Behling et al 2000, Werneck et al 2011, Arruda et al 2018, Bouimetarhan et al 2018, Medeiros et al 2018. Nowadays, they are the result of the combination of vestigial Dry Forest with species of the Caatinga, which have advanced with the dryness increase in the region (Silva and Souza 2018), which justifies its greater distribution in the border region of the Caatinga biome, in contact with Dry Forests.…”

Section: Discussionmentioning

confidence: 99%

Climate and soils at the Brazilian semiarid and the forest-Caatinga problem: new insights and implications for conservation

Oliveira

Francelino

Arruda

et al. 2019

Environ. Res. Lett.

View full text Add to dashboard Cite

This study aimed to test two hypotheses: (i) on the Brazilian semiarid territory, the climate has greater weight as a driver of vegetation than the soil and; (ii) the arboreal Caatinga is a vegetation whose environmental attributes are similar to the Dry Forest, in terms of soil and climate attributes. We analyzed attributes of the superficial horizon of 156 standardized profiles distributed throughout the Brazilian semiarid region. Bioclimatic variables were obtained from the WorldClim platform and extracted to profiles location. The main vegetation types in the region were considered: Caatinga, arboreal Caatinga, Dry Forest and Cerrado. Variable selection was performed with hierarchical correlation dendrogram and recursive feature elimination algorithm. Linear Discriminant Analysis and Random Forest (RF) algorithm were used for modeling the edaphic and climate niche and predict the vegetation with the selected variables. Climate and soil, individually, were able to separate the vegetation, but the climate was no better predictor than the soil. Therefore, we reject the first hypothesis. However, the better prediction was attained with the combined use of soil and climate attributes. The parsimonious RF model had good performance, with Kappa 0.61±0.10 and 70.9%±7.7% accuracy. The combination of soil and climate predictors resulted in better separation of vegetation in the Brazilian semiarid region. Soil attributes are key variables in large-scale biogeographic modeling. The so-called arboreal Caatinga is distributed over a wide edaphic and climatic range, with strong similarity to the Dry Forest distribution, confirmed by the great overlap in the multivariate space, which confirms the second hypothesis. The results point towards an urgent review of the Atlantic Forest Law. The environments where the arboreal Caatinga and the Dry Forest occur are very similar, so that the former may represent a degraded phase of the Atlantic Forest, currently without the due legal protection.

show abstract

Section: Discussionmentioning

confidence: 99%

Climate and soils at the Brazilian semiarid and the forest-Caatinga problem: new insights and implications for conservation

Oliveira

Francelino

Arruda

et al. 2019

Environ. Res. Lett.

View full text Add to dashboard Cite

show abstract

“…Jennerjahn et al, 2004;Lessa et al, 2017;Mulitza et al, 2017;Portilho-Ramos et al, 2015;Rühlemann et al, 1999). Cores located adjacent to the semi-arid NE Brazil have allowed for several investigations addressing the interplay between changes in the Atlantic Meridional Overturning Circulation (AMOC), the sea surface temperature (SST) of the tropical Atlantic, and the continental climate (in terms of precipitation and vegetation cover) in centennial to millennial time-scales (Behling et al, 2000;Bouimetarhan et al, 2018;Burckel et al, 2015;Crivellari et al, 2019;Venancio et al, 2018;Zhang et al, 2015Zhang et al, , 2017.…”

Section: Introductionmentioning

confidence: 99%

Contrasting late-glacial paleoceanographic evolution between the upper and lower continental slope of the western South Atlantic

Luz¹,

Santos²,

Eglinton³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The records distributed along the western South Atlantic display considerably het-L. G. Luz et al: Contrasting late-glacial record across the South Atlantic Slope erogeneous features in terms of sedimentation rate and response to the adjacent continental climate, which makes the scientific outputs extremely dependent on the core site location. Those cores located adjacent to the semiarid NE Brazil allowed several investigations addressing the interplay between changes in the Atlantic Meridional Overturning Circulation (AMOC), the sea surface temperature (SST) of the tropical Atlantic, and the continental climate (in terms of precipitation and vegetation cover) in centennial to millennial timescales (Behling et al, 2000;Bouimetarhan et al, 2018;Burckel et al, 2015;Crivellari et al, 2019;Venancio et al, 2018;Zhang et al, 2015Zhang et al, , 2017. Otherwise, marine records recovered from the subtropical realm (south of 20 • S) generally do not show obvious sea surface millennial-scale features like those from NE Brazil (Santos et al, 2017a); nonetheless, this area suffers large changes in the winddriven upwelling patterns, with consequences for regional upper-ocean productivity (Lessa et al, 2019;Portilho-Ramos et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Contrasting late-glacial paleoceanographic evolution between the upper and lower continental slope of the western South Atlantic

Luz

Santos

Eglinton³

et al. 2020

Clim. Past

View full text Add to dashboard Cite

Abstract. The number of sedimentary records collected along the Brazilian continental margin has increased significantly in recent years, but relatively few are located in shallow waters and register paleoceanographic processes in the outer shelf–middle slope prior to 10–15 ka. For instance, the northward flow up to 23–24∘ S of cold and fresh shelf waters sourced from the Subantarctic region is an important feature of current hydrodynamics in the subtropical western South Atlantic Ocean, and yet limited information is available for the long-term changes of this system. Herein, we considered a suite of organic and inorganic proxies – alkenones-derived sea surface temperature (SST), δD-alkenones, δ18O of planktonic foraminifera, and ice-volume free seawater δ18OIVF−SW – in sediment from two cores (RJ-1501 and RJ-1502) collected off the Rio de Janeiro Shelf (SE Brazilian continental shelf) to shed light on SST patterns and relative salinity variations since the end of the last glacial cycle in the region and the implications of these processes over a broader spatial scale. The data indicate that, despite the proximity (∼40 km apart) of both cores, apparently contradictory climatic evolution occurred at the two sites, with the shallower (deeper) core RJ-1501 (RJ-1502) showing consistently cold (warm) and fresh (salt) conditions toward the Last Glacial Maximum (LGM) and last deglaciation. This can be reconciled by considering that the RJ-1501 core registered a signal from mid- to high latitudes on the upper slope off Rio de Janeiro represented by the influence of the cold and fresh waters composed of Subantarctic Shelf Water and La Plata Plume Water transported northward by the Brazilian Coastal Current (BCC). The data from core RJ-1502 and previous information for deep-cores from the same region support this interpretation. In addition, alkenone-derived SST and δ18OIVF−SW suggest a steep thermal and density gradient formed between the BCC and Brazil Current (BC) during the last climate transition which, in turn, may have generated perturbations in the air–sea heat flux with consequences for the regional climate of SE South America. In a scenario of future weakening of the Atlantic Meridional Overturning Circulation, the reconstructed gradient may become a prominent feature of the region.

show abstract

Intermittent development of forest corridors in northeastern Brazil during the last deglaciation: Climatic and ecologic evidence

Cited by 35 publications

References 55 publications

Climate and soils at the Brazilian semiarid and the forest-Caatinga problem: new insights and implications for conservation

Climate and soils at the Brazilian semiarid and the forest-Caatinga problem: new insights and implications for conservation

Contrasting late-glacial paleoceanographic evolution between the upper and lower continental slope of the western South Atlantic

Contrasting late-glacial paleoceanographic evolution between the upper and lower continental slope of the western South Atlantic

Contact Info

Product

Resources

About