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7 results for “habitat specialisation”
Vellozioid roots allow for habitat specialisation among rock- and soil-dwelling Velloziaceae in campos rupestres
<p>1. Plant growth on harsh substrates (habitat specialisation) requires specific traits to cope with stressful conditions. 2. We tested whether traits related to nutrient acquisition (root colonisation by fungal symbionts, and plant morphological and physiological specialisations), and nutrient use (leaf nitrogen (N) and phosphorus (P) concentrations and N- and P-remobilisation efficiency), were related to habitat specialisation for 27 species of Velloziaceae growing either in soil or on rocks in extremely P-impoverished <i>campos rupestres</i> habitats. If habitat specialisation were to drive trait sorting, then we expect traits to differ between those substrates. 3. Both soil and rock-dwelling species presented a very low proportion of root length colonised by arbuscular mycorrhizal and dark septate fungi. However, rhizosheaths were only observed in soil-dwelling species, and vellozioid roots, a specialisation that allows for mining P and dissolving quartzite rock, were mostly found in rock-dwelling species. We did not observe differences in nutrient-use traits between rock- and soil-dwelling species. 4. Roots specialisations are strongly correlated with microhabitats, and the presence of vellozioid roots seems to mediate bare rock specialisation. There is an overall P limitation of plant productivity both on rock and in soil of <i>campos rupestres</i>, which does not drive the sorting of traits related to aboveground nutrient use and symbiotic P acquisition. Therefore, nutrient impoverishment is indeed a very strong environmental filter in <i>campos rupestres </i>as a whole, but habitat specialisation plays an important role in the spatial distribution of Velloziaceae between contrasting substrates.</p>
Data from: Biogeographic history and habitat specialisation shape floristic and phylogenetic composition across Amazonian forests
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Vellozioid roots allow for habitat specialisation among rock- and soil-dwelling Velloziaceae in campos rupestres
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Data from: Reproductive success is driven by local site fidelity despite stronger specialisation by individuals for large scale habitat preference
1. There is widespread evidence that within populations, specialists and generalists can coexist and this is particularly prevalent in marine ecosystems, where foraging specialisations are evident. 2. While individuals may limit niche overlap by consistently foraging in specific areas, site fidelity may also emerge as an artefact of habitat choice but both drivers and fitness consequences of site fidelity are poorly understood. 3. Here we examine an individual metric of site and habitat fidelity, using tracking data collected over 11 years for black-browed albatrosses (Thalassarche melanophris). Fidelity was calculated as the similarity between pairs of foraging zones, quantifying measures for within and between years. Foraging areas were identified using area restricted search, defined as periods during which birds decrease speed and increase turning. 4. Our results demonstrate that birds were considerably more specialised in the habitat in which they forage than the exact location they use within years, and there was a similar pattern between years. However, despite this, it was site fidelity that explained reproductive success. Within a single year, females which were more faithful to a specific location had higher reproductive success than non-specialists and between years there was tendency for both sexes. 5. Our results suggest that black-browed albatrosses are highly faithful in their foraging habitat but it is rather site fidelity that is more clearly associated with reproductive success.
Data from: Reproductive success is driven by local site fidelity despite stronger specialisation by individuals for large scale habitat preference
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Data from: Asymmetrical habitat coupling of an aquatic predator – the importance of individual specialisation
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Data from: The influence of habitat accessibility on the dietary and morphological specialisation of an aquatic predator
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