Clade-Specific Biogeographic History and Climatic Niche Shifts of the Southern Andean-Southern Brazilian Disjunction in Plants

Luebert, Federico; Lörch, Maximilian; Acuña, Rafael; Mello‐Silva, Renato de; Weigend, Maximilian; Mutke, Jens

doi:10.1007/978-3-030-31167-4_24

Cited by 8 publications

(4 citation statements)

References 63 publications

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“…They show a greater affinity for aridity and include temperature variations that separate northern and southern species, likely due to the presence of species from these bioregions in the transition zone, which aligns with observed floristic affinities (Figure 4). This diversity allows them to occupy a broad spectrum within the climatic gradient, consistent with studies that include transition zones in South America [59].…”

Section: Niche Overlapsupporting

confidence: 83%

Environmental Filters Structure Cushion Bogs’ Floristic Composition along the Southern South American Latitudinal Gradient

Figueroa-Ponce,

Hinojosa

2024

Preprint

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In southern South America, zonal flora, defined by macroclimatic conditions, is strongly influenced by an aridity filter near 29°S. Cushion bogs, high-altitude wetlands along the Andes, display homogeneous flora with cushion species dominance, contrasting with zonal vegetation. Despite being influenced by microclimatic conditions, these ecosystems experience varied environmental effects. This study identifies environmental filters affecting bog communities along a broad-scale latitudinal gradient from 15°S to 42°S. We analyzed 420 bogs and 284 species across three macroclimatic regions with distinct summer, winter, and transitional arid rainfall regimes. Using variance partitioning and membership-based regionalization models, we examined the impacts of climatic, edaphic, and spatial variables on beta diversity. We also assessed species' niche overlap and the influence of environmental filters on the communities' phylogenetic diversity. Results show that species turnover and niche overlap vary with macroclimatic differences, delineating three distinct regions. Notably, phylogenetic clustering in the driest part of the gradient (23°S —24°S) highlights the impact of the environmental filter. Aridity and temperature variations at a broad scale serve as environmental filters shaping the composition of bog communities across southern South America.

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Section: Niche Overlapsupporting

confidence: 83%

Environmental Filters Structure Cushion Bogs’ Floristic Composition along the Southern South American Latitudinal Gradient

Figueroa-Ponce,

Hinojosa

2024

Preprint

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“…The assumption of a single species with disjunct distribution on either side of the South American continent, assumed a long‐distance dispersal or a combination of different biogeographic events, as proposed by other authors for similarly disjunct distributed groups (e.g., Murillo‐A. & al., 2016; Luebert & al., 2020). Our results corroborate Ipheion recurvifolium and Tristagma sessile to be different lineages, adding support to the differentiation of Ipheion from the rest of Tristagma species, with a unique karyological (Souza & al., 2016) and biogeographic history.…”

Section: Discussionmentioning

confidence: 99%

One species with a disjunct distribution or two with convergent evolution? Taxonomy of two South American garlics

Sassone

Arroyo

Arroyo-Leuenberger

et al. 2021

TAXON

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The establishment of species boundaries has been a difficult task for biologists since the beginning of classifications. Within South American Allioideae (= Alliaceae), the delimitation of genera and species has long been a major challenge. Consequently, species‐level nomenclature in these groups has been difficult to elucidate. Ipheion and Tristagma are two closely related South American genera for which the delimitation and circumscription of several species continue to be unclear. Tristagma sessile, a species inhabiting the Andes and the Coast Range in Chile, and Ipheion recurvifolium, a species native to Uruguay only found close to sea level, have been considered as one species with an intracontinental disjunct distribution. The divergent habitats and distributions of these taxa have stirred the question of whether they are a single species. The present study aims to elucidate the evolutionary relationships and status of the Chilean and Pampean taxa. We also analysed the name Tristagma leichtlinii, which has long been a source of confusion. Based on their phylogenetic relationships, geographical distributions, flowering periods, and DNA content, we conclude that the two taxa are different species and assignable to separate genera. We propose that the morphological similarity of Ipheion recurvifolium and Tristagma sessile, amply corroborated in this study, might be the sum of shared synapomorphies (between Ipheion and Tristagma) and convergent features. We update the biogeographic history of the two genera and propose that similar pollinators might underpin the convergence in floral traits. We outline the differences among genera and species, present a taxonomic review with a new lectotype and consider the conservation status of the studied species.

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“…Similar to what has been proposed for the eSADD, the wSADD has been considered as a vicariant barrier that had shaped disjunctions, especially in plants (Villagrán and Hinojosa 1997, Moreira-Muñoz 2011. Evidence for the formation of vicariant disjunct patterns has been found in plant groups disjunctly distributed in the southern Andes (Mediterranean woodlands and temperate rainforests domains) and southern Brazil (mainly Atlantic Forest domain) that split during the Miocene (Chacón et al 2012, Murillo et al 2016, Moreira-Muñoz et al 2020, though not all groups sharing this disjunction can be explained by the origin of the wSADD, with some groups probably having dispersed more recently across already formed arid environments (Luebert et al 2020). A disjunct distribution pattern between the southern and the tropical Andes with a distribution gap at the arid zones of Atacama and Peruvian deserts has also been documented in several plant groups (reviewed in Lörch et al 2021).…”

Section: Biogeographic Patterns Within and Around The Dry Diagonalsmentioning

confidence: 99%

The two South American dry diagonals

Luebert¹

2021

Frontiers of Biogeography

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South American drylands roughly form two diagonals both termed in the biogeographical literature as the "South American dry diagonal" (SADD). However, they correspond to two different geographical areas. One comprises the Caatinga, Cerrado and Chaco domains, thus encompassing the areas between northeastern Brazil and northwestern Argentina. The other stretches from Patagonia in southern Argentina to the Pacific deserts of northern Chile and Peru, thus also including the Monte, Prepuna and dry Puna domains. I termed them the eastern and western SADDs, respectively (i.e., eSADD and wSADD). In this mini review I attempt to summarize the major climatic features of the two South American dry diagonals, their possible origins, biogeographical patterns within and around them and to explore possible interconnections. The eSADD is generally more humid than the wSADD and has more pronounced rainfall seasonality, with precipitation concentrated in summer, while the wSADD tends to be less seasonal due to year-round aridity, with little precipitation largely occurring in winter. The origin of both diagonals appears to go back to the middle Miocene, associated with global cooling. Biogeographical studies show that these diagonals are important in structuring South American distribution patterns south of the Equator, both acting as barriers for humid-adapted lineages and corridors for arid-adapted taxa. Remarkably, the two diagonals appear to have few plant and animal taxa in common, which may explain why biogeographers speaking about one diagonal seem to ignore the existence of the other. Highlights• Two South American regions have been referred to as the South American dry diagonals.• The first comprises the Caatinga, Cerrado and Chaco domains. The second encompasses Patagonia, Monte, Prepuna, dry Puna and Pacific Desert. • These two diagonals are key in structuring South American distribution patterns, acting both as dispersal barriers and corridors. • They appear to have little in common, both floristically and faunistically.

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Clade-Specific Biogeographic History and Climatic Niche Shifts of the Southern Andean-Southern Brazilian Disjunction in Plants

Cited by 8 publications

References 63 publications

Environmental Filters Structure Cushion Bogs’ Floristic Composition along the Southern South American Latitudinal Gradient

Environmental Filters Structure Cushion Bogs’ Floristic Composition along the Southern South American Latitudinal Gradient

One species with a disjunct distribution or two with convergent evolution? Taxonomy of two South American garlics

The two South American dry diagonals

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