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8 results for “monodominance”
Data from: Resource acquisition strategies facilitate Gilbertiodendron dewevrei monodominance in African lowland forests
1. Tropical forests are hyperdiverse, yet extensive areas of monodominant forest occur in the tropics worldwide. Most long-lived and persistent monodominant tree species form ectomycorrhizal fungi symbioses, allowing them to obtain nutrients directly from soil organic matter. This might promote monodominance by reducing nutrient availability to co-occurring species, the majority of which form associations with arbuscular mycorrhizal fungi. 2. Gilbertiodendron dewevrei forest is the most widespread monodominant forest in tropical Africa. Its distribution appears determined in part by moisture availability, but its monodominance is not thought to be driven by its fungal partner or soil fertility. 3. Here we compare soil fertility of twenty G. dewevrei stands to mixed forest from three sites across an 8,400 km2 region of the Central African Republic and the Republic of Congo. In contrast to previous studies, we find monodominant G. dewevrei stands associated with infertile soils, as base cations (calcium, magnesium, total exchangeable bases) and extractable manganese are extremely low, and significantly lower in soils under G. dewevrei forest compared to mixed forest. Further, and consistent with ectomycorrhizal forests globally, soil carbon to nitrogen and carbon to phosphorus ratios are significantly higher in G. dewevrei stands than in mixed forest stands, providing evidence in support of direct acquisition of nitrogen and phosphorus from soil organic matter by ectomycorrhizal fungi. 4. Gilbertiodendron dewevrei recruits from the seedling bank, with its large seedlings surviving in high densities for over a decade. We tested whether light plasticity could facilitate monodominance by growing seedlings of G. dewevrei under controlled light conditions. We found that its seedlings grow well under a wide range of irradiance levels and conclude that this plasticity affords a competitive advantage. 5. Synthesis: We reframe the discussion of factors contributing to monodominance of G. dewevrei into one of resource acquisition and use efficiency. In particular, G. dewevrei is associated with moist and infertile soils and competes well under a variety of light conditions. Our data is consistent with a model where root associations with ectomycorrhizal fungi drive monodominance through the direct acquisition of nutrients from soil organic matter, promoting nutrient limitation of co-occurring species.
Data from: Puercosuchus traverorum n. gen. and sp.: a new malerisaurine azendohsaurid (Archosauromorpha: Allokotosauria) from two monodominant bonebeds in the Chinle Formation (Upper Triassic, Norian) of Arizona
<p><span><span>Non-archosaur archosauromorphs are a paraphyletic group of diapsid reptiles that are important members of global Middle Triassic and Late Triassic continental ecosystems. Included in this group are the azendohsaurids, a clade of allokotosaurians (kuehneosaurids and Azendohsauridae + Trilophosauridae) that retain the plesiomorphic archosauromorph postcranial body plan but have evolved disparate cranial features that converge on later dinosaurian anatomy, including sauropodomorph-like marginal dentition and ceratopsian-like postorbital horns. Here we describe a new malerisaurine azendohsaurid from two monodominant bonebeds in the Blue Mesa Member, Chinle Formation (Late Triassic, ~218</span><span>–</span><span>220 Ma); the first occurs at Petrified Forest National Park and preserves a minimum of eight individuals of varying sizes, and the second occurs near St. Johns, Arizona. <em>Puercosuchus traverorum</em> n. gen. and sp. is a carnivorous malerisaurine that is closely related to <em>Malerisaurus robinsonae</em> from the Maleri Formation of India and to <em>Malerisaurus langstoni</em> from the Dockum Group of western Texas. Dentigerous elements from <em>Puercosuchus traverorum</em> confirm that some Late Triassic tooth morphotypes thought to represent early dinosaurs cannot be differentiated from, and likely pertain to, <em>Puercosuchus</em>-like malerisaurine taxa. These bonebeds from northern Arizona support the hypothesis that non-archosauriform archosauromorphs were locally diverse near the middle of the Norian and experienced an extinction event prior to the end-Triassic mass extinction coincidental with the Adamanian-Revueltian boundary recognized at Petrified Forest National Park. The relatively late age of this early-diverging taxon (Norian) suggests that the diversity of azendohsaurids is underrepresented in the Middle Triassic and Late Triassic fossil records around the world.</span></span></p>
Data from: Puercosuchus traverorum n. gen. and sp.: a new malerisaurine azendohsaurid (Archosauromorpha: Allokotosauria) from two monodominant bonebeds in the Chinle Formation (Upper Triassic, Norian) of Arizona
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Data from: Resource acquisition strategies facilitate Gilbertiodendron dewevrei monodominance in African lowland forests
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Data from: Geographical variation in community divergence: insights from tropical forest monodominance by ectomycorrhizal trees
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Ectomycorrhizal fungal community assembly on seedlings of a Neotropical monodominant tree
<p>Ectomycorrhizal tree species may benefit from positive plant-soil feedbacks, where soil environments near adult trees enhance conspecific seedling growth and survival. In tropical monodominant forests seedling survival is particularly important, as seedling banks help maintain stand-level dominance over generations. Positive plant-soil feedbacks may be mediated by diverse ectomycorrhizal fungal communities, which improve nutrient acquisition of heavily shaded seedlings. Despite the potential importance of these fungi, little is known about ectomycorrhizal fungal community development on seedlings of tropical monodominant trees. In Guyana, we sequentially monitored percent colonization and species composition of ectomycorrhizal fungi on an even-age cohort of seedlings of the tropical monodominant tree <i>Dicymbe corymbosa </i>(Fabaceae subfamily Detarioideae). Ectomycorrhizal fungi found on <i>D. corymbosa </i>seedlings over a twelve-month period of early development were compared to those of conspecific adults and four other ectomycorrhizal tree species in the region. Species turnover was high (80%) between six- and twelve-month-old seedlings, though the /russula-lactarius, /clavulina, and /tomentella-thelephora lineages were species-rich on seedlings at all ages. The number of ectomycorrhizal morphotypes per seedling increased with age, but extent of fungal colonization did not. Seedling ectomycorrhizal fungi were shared with sympatric conspecific adults (55%) and, to a lesser extent, regional heterospecific adults (27%), but numerous species were previously unrecorded for Guyana<i>.<b> </b></i>Over their development<b> </b><i>D. corymbosa </i>seedlings did not rely strictly on adult trees for their mycobionts but appeared to foster unique assemblages of ectomycorrhizal fungi.</p>
Ectomycorrhizal fungal community assembly on seedlings of a Neotropical monodominant tree
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Fire-prone monodominant vegetation acts as carbon sinks after fire - Data
<p>These data are part of the analysis and results found in the article in process of publication entitled -</p> <p><strong>Fire-prone monodominant vegetation acts as carbon sinks after fire</strong></p>
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