Hanna Tuomisto, Lassi Suominen, Alfonso Alonso, Glenda Cárdenas, Samuli Lehtonen, Gabriel Massaine Moulatlet, Eneas Pérez, Anders Sirén, Patrick Weigelt, Gabriela Zuquim
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Here we explore fern species distributions along an important edaphic gradient, how narrow their realised niches are and how sensitive inferences are to species commonness, data quality and the region being sampled.</p>\n </section>\n \n <section>\n \n <h3> Location</h3>\n \n <p>Amazonia.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>We used a large data set (1,215 transects across lowland Amazonia) to explore the realised niches of 54 species of two fern genera (<i>Adiantum</i> and <i>Lindsaea</i>) along a soil base cation concentration gradient. We used weighted averaging to estimate species optima and niche widths, and Huisman–Olff–Fresco modelling to assess species response shapes.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>Overall, species optima were rather evenly spread along the soil base cation concentration gradient, but <i>Lindsaea</i> optima were limited to the lower half of the gradient, whereas <i>Adiantum</i> optima were more often in the upper half. Most species had unimodal response curves. Mean niche width was ca. 25% of the observed gradient length for <i>Adiantum</i> and 17% for <i>Lindsaea</i> and was only weakly or not at all related to different aspects of species commonness. Species optima were robust to different modelling approaches and consistent across regional subsets. However, the central Amazonian data contained no transects with high soil base cation concentration, so species with high optima were either absent or obtained a lower optimum than in the NW and SW regions.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>Our results support niche-related species sorting as an important process that defines species co-occurrence, turnover and richness patterns within Amazonian rainforests. All <i>Adiantum</i> and <i>Lindsaea</i> species, including the most abundant ones, had narrow enough realised niches to be considered useful indicators of edaphic and floristic variation within the rainforest.</p>\n </section>\n </div>","PeriodicalId":49965,"journal":{"name":"Journal of Vegetation Science","volume":"35 5","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jvs.13307","citationCount":"0","resultStr":"{\"title\":\"Species–soil relationships across Amazonia: Niche specificity and consistency in understorey ferns\",\"authors\":\"Hanna Tuomisto, Lassi Suominen, Alfonso Alonso, Glenda Cárdenas, Samuli Lehtonen, Gabriel Massaine Moulatlet, Eneas Pérez, Anders Sirén, Patrick Weigelt, Gabriela Zuquim\",\"doi\":\"10.1111/jvs.13307\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Aims</h3>\\n \\n <p>Knowledge about species niches along environmental gradients is needed to understand community assembly and spatial variation in floristic composition and species richness. In Amazonian rainforests, such knowledge is largely lacking, although ferns have been used to infer overall floristic and edaphic patterns. Here we explore fern species distributions along an important edaphic gradient, how narrow their realised niches are and how sensitive inferences are to species commonness, data quality and the region being sampled.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Location</h3>\\n \\n <p>Amazonia.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>We used a large data set (1,215 transects across lowland Amazonia) to explore the realised niches of 54 species of two fern genera (<i>Adiantum</i> and <i>Lindsaea</i>) along a soil base cation concentration gradient. We used weighted averaging to estimate species optima and niche widths, and Huisman–Olff–Fresco modelling to assess species response shapes.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>Overall, species optima were rather evenly spread along the soil base cation concentration gradient, but <i>Lindsaea</i> optima were limited to the lower half of the gradient, whereas <i>Adiantum</i> optima were more often in the upper half. Most species had unimodal response curves. Mean niche width was ca. 25% of the observed gradient length for <i>Adiantum</i> and 17% for <i>Lindsaea</i> and was only weakly or not at all related to different aspects of species commonness. Species optima were robust to different modelling approaches and consistent across regional subsets. 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Species–soil relationships across Amazonia: Niche specificity and consistency in understorey ferns
Aims
Knowledge about species niches along environmental gradients is needed to understand community assembly and spatial variation in floristic composition and species richness. In Amazonian rainforests, such knowledge is largely lacking, although ferns have been used to infer overall floristic and edaphic patterns. Here we explore fern species distributions along an important edaphic gradient, how narrow their realised niches are and how sensitive inferences are to species commonness, data quality and the region being sampled.
Location
Amazonia.
Methods
We used a large data set (1,215 transects across lowland Amazonia) to explore the realised niches of 54 species of two fern genera (Adiantum and Lindsaea) along a soil base cation concentration gradient. We used weighted averaging to estimate species optima and niche widths, and Huisman–Olff–Fresco modelling to assess species response shapes.
Results
Overall, species optima were rather evenly spread along the soil base cation concentration gradient, but Lindsaea optima were limited to the lower half of the gradient, whereas Adiantum optima were more often in the upper half. Most species had unimodal response curves. Mean niche width was ca. 25% of the observed gradient length for Adiantum and 17% for Lindsaea and was only weakly or not at all related to different aspects of species commonness. Species optima were robust to different modelling approaches and consistent across regional subsets. However, the central Amazonian data contained no transects with high soil base cation concentration, so species with high optima were either absent or obtained a lower optimum than in the NW and SW regions.
Conclusions
Our results support niche-related species sorting as an important process that defines species co-occurrence, turnover and richness patterns within Amazonian rainforests. All Adiantum and Lindsaea species, including the most abundant ones, had narrow enough realised niches to be considered useful indicators of edaphic and floristic variation within the rainforest.
期刊介绍：
The Journal of Vegetation Science publishes papers on all aspects of plant community ecology, with particular emphasis on papers that develop new concepts or methods, test theory, identify general patterns, or that are otherwise likely to interest a broad international readership. Papers may focus on any aspect of vegetation science, e.g. community structure (including community assembly and plant functional types), biodiversity (including species richness and composition), spatial patterns (including plant geography and landscape ecology), temporal changes (including demography, community dynamics and palaeoecology) and processes (including ecophysiology), provided the focus is on increasing our understanding of plant communities. The Journal publishes papers on the ecology of a single species only if it plays a key role in structuring plant communities. Papers that apply ecological concepts, theories and methods to the vegetation management, conservation and restoration, and papers on vegetation survey should be directed to our associate journal, Applied Vegetation Science journal.
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