Publications by authors named "Ditte K Hendrichsen"
Climatic factors influence the interactions among trophic levels in an ecosystem in multiple ways. However, whereas most studies focus on single factors in isolation, mainly due to interrelation and correlation among drivers complicating interpretation and analyses, there are still only few studies on how multiple ecosystems respond to climate related factors at the same time. Here, we use a hierarchical Bayesian model with a bioenergetic predator-prey framework to study how different climatic factors affect trophic interactions and production in small Arctic lakes.
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- The nutritional state of northern ungulates, like muskoxen, is influenced by their environment and directly affects reproductive rates, such as pregnancy.
- Through analyzing nitrogen stable isotopes in muskox guard hairs from Greenland over approximately 2.5 years, researchers reconstructed their dietary history, showing seasonal dietary patterns tied to environmental factors like temperature and snow depth.
- The study suggests that winter dietary conditions could serve as indicators for calf production in the spring and highlights the potential for using stable isotope analysis as a monitoring tool for wildlife in remote Arctic regions.
Background: Statistical autoregressive analyses of direct and delayed density dependence are widespread in ecological research. The models suggest that changes in ecological factors affecting density dependence, like predation and landscape heterogeneity are directly portrayed in the first and second order autoregressive parameters, and the models are therefore used to decipher complex biological patterns. However, independent tests of model predictions are complicated by the inherent variability of natural populations, where differences in landscape structure, climate or species composition prevent controlled repeated analyses.
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