动物实验 z-bio 2021-02-21 503

　　A new study conducted by researchers from Radboud University in collaboration with international researchers from McGill University (Canada) and University of Montana (USA) shows that large fish have more difficulty breathing in warm water than small fish. This means that ocean warming caused by climate change will affect the respiratory physiology of big fish, and ultimately affect the physiology, viability and size of fish. Oxygen is essential for animals to produce energy needed for growth, reproduction and survival. Oxygen absorption is related to factors such as body temperature and body type. Compared with large animals of the same species, small animals consume a relatively large amount of oxygen. We also know that fish that live in warmer regions need more oxygen than cold regions.

　　 complex interaction

　　 Biologists use their knowledge of oxygen absorption to predict how animals respond to changes in the outside world (such as global warming). For example, as the ocean warms, will fish move to cooler areas? Or, stop growing as soon as possible to prevent breathing difficulties. Does this have a major impact on fertility? To be precise, biologists are suffering from the interaction of predicted size, temperature, and oxygen absorption. Lead author Juan Lubakaba (Magil and Montana) said: “This is because this relationship interacts and complicates this research.” “For example, warming will increase the oxygen uptake of fish and the surrounding water It consumes oxygen and causes oxygen consumption. Ventilation because it interferes with the oxygen absorption in the through holes, but the efficiency of this ventilation depends on the water temperature and body shape."

　　 ventilation

　　 In order to better understand the working principles of these mechanisms, researchers have developed a model that can directly simulate the effect of oxygen conditions around the model. Radboud biologist Wilco Verberk explained: “We compared the oxygen uptake predictions of the new model with actual measurements of more than 200 fish species. These predictions are in perfect agreement with the empirical model. The consensus is that, The oxygen content in large and warm fish. I have noticed this limitation. Water is more likely to happen"

　　Ubarkaba: "Although the early models mainly focused on oxygen absorption by animals at rest or at low temperatures, our model may limit oxygen if all three factors are considered at the same time."

　　The new model is more ecological than the previous model, the former focuses on resting fish. This is very important. Weber: "Finding food from predators, growing, reproducing and escaping require more energy, and therefore oxygen, especially due to the warming of lakes, oceans and rivers leading to larger individuals in fish."