@article{10.18756/jfg.2011.7,
	title = {{Die Senkrechte in der Evolution. Wieso liegt die Fluke beim Wal quer? }},
	shorttitle = {{Die Senkrechte in der Evolution}},
	author = {Ruof, J{\"o}rg},
	journal = {Jahrbuch für Goetheanismus},
	year = {2011},
	volume = {2011},
	pages = {7--24},
	url = {https://dx.doi.org/10.18756/jfg.2011.7},
	doi = {10.18756/jfg.2011.7},
	issn = {Print :1866-4830 Online : 2750-2341 },
	language = {de},
	abstract = {},
	annote = {The upright position in the evolution Why is the fluke of the Whale shaped horizontallyDolphins and whales are waterbased mammals and differ in various characteristics from fish the predominant water species A comparison of those two animal groups provides helpful insights into basic concepts of evolution Evolutionary research currently assumes that the waterbased mammals participated in the evolutionary transition from water to landbased animals but subsequently reverted to a waterbased lifestyleKey characteristics which discriminate whales and dolphins from fish are lungbased respiration the respiratory storm which is localized at the top end of the body size and weight of the body reproduction with an enormous focus on birth feeding and nursing of individual baby calves and a steady body temperature despite the arctic habitatFurthermore whales and fish are differentiated by their respective movements While horizontal movements are typical for the fish vertical movements of the body are characteristic for whales and dolphins ln accord with these different axes of movement the respective key organ of movement of the fish the rail fin is vertical whereas the whales fluke is horizontalThe different impact of body weight and the trend towards a vertical body axis are key principles that shape the evolutionary transition from water to a landbased lifestyle Taking into account those principles we will try to provide some insight into the characteristic body shape and movement in whales and dolphins}
}