We design, implement and evaluate two semantic parsers, which represent factorizationand composition-based approaches respectively, for Elementary Dependency Structures (EDS) at the CoNLL 2019 Shared Task on Cross-Framework Meaning Representation Parsing. The detailed evaluation of the two parsers gives us a new perception about parsing into linguistically enriched meaning representations: current neural EDS parsers are able to reach an accuracy at the interannotator agreement level in the same-epochand-domain setup.
Heavy metal enrichment in the prey of red-crowned cranes in Zhalong Wetland, northeastern China was researched. Lead and Cd were the most abundant elements in the sediments; their concentrations ranged from 9.85 to 127 ppm and from 1.23 to 10.6 ppm, respectively. Six aquatic animal taxa contained detectable levels of heavy metals, in the decreasing order of Cyprinidae > Cobitidae > Dytiscidae > Odontobutidae > Viviparidae > Aeshnidae. Metal concentrations in these taxa followed the order: Zn > Cu > Cr > Pb > Hg > Cd. Metals in tissues of the red-crowned crane varied in the following order: Zn > Cr > Cu > Pb > Cd > Hg in feathers, and Zn > Cu > Hg > Cr > Pb > Cd in eggshells. Cadmium concentrations in the feathers of the red-crowned crane exceeded a level considered to be potentially toxic in birds (i.e., 0.22 ppm), ranging from 1.42 to 3.06 ppm.
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