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171 results for “tropical to temperate”

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zenodo36/100

FIG. 6 in On the phanerobranch dorids of Angola (Mollusca, Nudibranchia): a crossroads of temperate and tropical species

FIG. 6. — Polycera hedgpethi (MNHN), dorsal view of the living animal. Scale bar: 1 mm.

opencc-zeroDec 2000View details →

zenodo36/100

FIG. 2 in On the phanerobranch dorids of Angola (Mollusca, Nudibranchia): a crossroads of temperate and tropical species

FIG. 2. — Okenia digitata (MNHN), dorsal view of the living animal. Scale bar: 1 mm.

opencc-zeroDec 2000View details →

zenodo36/100

FIG. 1 in On the phanerobranch dorids of Angola (Mollusca, Nudibranchia): a crossroads of temperate and tropical species

FIG. 1. — Okenia cf. amoenula (MNHN), dorsal view of the living animal. Scale bar: 1 mm.

opencc-zeroDec 2000View details →

dryad36/100

Symbiotic nitrogen fixation does not stimulate soil phosphatase activity under temperate and tropical trees

<p>Symbiotic nitrogen (N)-fixing plants can enrich ecosystems with N, which can alter the cycling and demand for other nutrients. Researchers have hypothesized that fixed N could be used by plants and soil microbes to produce extracellular phosphatase enzymes, which release P from organic matter. Consistent with this speculation, the presence of N-fixing plants is often associated with high phosphatase activity, either in the soil or on root surfaces, although other studies have not found this association, and the connection between phosphatase and rates of N fixation—the mechanistic part of the argument—is tenuous. Here, we measured soil phosphatase activity under N-fixing trees and non-fixing trees transplanted and grown in tropical and temperate sites in the USA: two sites in Hawaii, and one each in New York and Oregon. This provides a rare example of phosphatase activity measured in a multi-site field experiment with rigorously quantified rates of N fixation. We found no difference in soil phosphatase activity under N-fixing vs. non-fixing trees nor across rates of N fixation, though we note that no sites were P limited and only one was N limited. Our results add to the literature showing no connection between N fixation rates and phosphatase activity.</p>

opencc-zeroFeb 2023View details →

dryad36/100

Tropical and temperate differences in the trophic structure and aquatic prey use of riparian predators

<p>The influence of aquatic resource-inputs on terrestrial communities is poorly understood, particularly in the tropics. We used stable isotope analysis of carbon and nitrogen to trace aquatic prey use and quantify impact on trophic structure in 240 riparian arthropod communities in tropical and temperate forests. Riparian predators consumed more aquatic prey and were more trophically diverse in the tropics than temperate regions, indicating tropical riparian communities are both more reliant on, and impacted by, aquatic resources than temperate communities. This suggests they are more vulnerable to disruption of aquatic-terrestrial linkages. Although aquatic resource use declined strongly with distance from water, we observed no correlated change in trophic structure, suggesting trophic flexibility to changing resource availability within riparian predator communities in both tropical and temperate regions. Our findings highlight the importance of aquatic resources for riparian communities, especially in the tropics, but suggest distance from water is less important than resource diversity in maintaining terrestrial trophic structure.</p>

opencc-zeroSep 2023View details →

dryad36/100