poikilotherm

简明释义

英[ˈpɒɪkɪlə(ʊ)ˌθɜːm]美[pɔɪˈkɪləˌθəm]

n. 变温动物

英英释义

单词用法

同义词

反义词

例句

1.Fish are poikilotherm whose body temperature changes as the ambient water temperature changes.

鱼类是变温动物，其体温随环境的水温变化而变化。

2.Fish are poikilotherm whose body temperature changes as the ambient water temperature changes.

鱼类是变温动物，其体温随环境的水温变化而变化。

3.Fish are often classified as poikilotherms 变温动物 because their body temperature changes with the surrounding water.

鱼通常被归类为变温动物，因为它们的体温随周围水域的变化而变化。

4.A poikilotherm 变温动物 relies on external temperatures to regulate its body heat.

一种变温动物依赖外部温度来调节其体温。

5.The metabolism of a poikilotherm 变温动物 can slow down significantly in colder temperatures.

变温动物的代谢在较冷的温度下可能会显著减缓。

6.In summer, a poikilotherm 变温动物 may become more active as the water warms up.

在夏季，变温动物可能会随着水温升高而变得更加活跃。

7.Lizards are a common example of poikilotherms 变温动物 that bask in the sun to warm up.

蜥蜴是一个常见的变温动物例子，它们通过晒太阳来提高体温。

作文

In the vast tapestry of life on Earth, organisms display a remarkable array of adaptations that allow them to thrive in diverse environments. Among these adaptations, one of the most fascinating is the ability of certain animals to regulate their body temperature through external means. These animals are known as poikilotherms, or in simpler terms, cold-blooded creatures. Unlike mammals and birds, which maintain a constant internal body temperature regardless of the surrounding environment, poikilotherms depend on environmental heat sources to regulate their body temperature. This essay will explore the characteristics, advantages, and disadvantages of poikilotherms, highlighting their unique role in the ecosystem.Poikilotherms include a wide variety of animals such as reptiles, amphibians, fish, and many invertebrates. One of the defining features of poikilotherms is their inability to generate sufficient metabolic heat to maintain a stable body temperature. Instead, they rely on behavioral adaptations to manage their thermal environment. For example, a lizard may bask in the sun to absorb heat when it is cold or seek shade when temperatures soar. This reliance on external temperatures makes poikilotherms particularly sensitive to changes in their environment, including seasonal variations and climate change.One significant advantage of being a poikilotherm is energy efficiency. Since these animals do not expend energy to maintain a constant body temperature, they require less food compared to warm-blooded animals of similar size. This energy-saving trait allows poikilotherms to thrive in environments where food resources are scarce. For instance, many reptiles can survive on a diet consisting of insects or small prey, making them well-suited for habitats where larger predators dominate. Additionally, during periods of extreme cold, some poikilotherms can enter a state of dormancy, reducing their metabolic rate significantly until conditions improve.However, the dependence on environmental temperatures also presents challenges for poikilotherms. Their activity levels, growth rates, and reproductive success are closely tied to the ambient temperature. For example, a sudden drop in temperature can slow down a poikilotherm's metabolism, making it sluggish and vulnerable to predation. Furthermore, climate change poses a significant threat to these animals, as rising temperatures can disrupt their natural habitats and lead to population declines. Many poikilotherms are already experiencing shifts in their distribution ranges as they seek suitable climates to survive.In conclusion, poikilotherms play a vital role in our ecosystems, serving as both predators and prey within their food webs. Their unique adaptations to temperature regulation highlight the diversity of life on our planet and the intricate connections between organisms and their environments. While they possess distinct advantages, such as energy efficiency, they also face significant challenges due to their reliance on external temperatures. As we continue to study and understand the complexities of poikilotherms, it becomes essential to protect their habitats and address the impacts of climate change to ensure their survival for future generations.

在地球生命的广袤画卷中，生物展示了一系列令人惊叹的适应能力，使它们能够在多样的环境中繁荣生长。在这些适应能力中，某些动物通过外部手段调节体温的能力尤为引人注目。这些动物被称为变温动物，简单来说，就是冷血生物。与哺乳动物和鸟类不同，后者能够在周围环境变化时保持恒定的内部体温，变温动物依赖于环境热源来调节其体温。本文将探讨变温动物的特征、优势和劣势，强调它们在生态系统中的独特角色。变温动物包括各种动物，如爬行动物、两栖动物、鱼类和许多无脊椎动物。变温动物的一个显著特征是它们无法产生足够的代谢热量来维持稳定的体温。相反，它们依靠行为适应来管理其热环境。例如，一只蜥蜴可能在寒冷时晒太阳以吸收热量，或在温度升高时寻找阴凉处。这种对外部温度的依赖使得变温动物对环境变化非常敏感，包括季节性变化和气候变化。作为变温动物的一个显著优势是能量效率。由于这些动物不需要消耗能量来维持恒定的体温，因此与同等大小的温血动物相比，它们所需的食物更少。这种节能特性使得变温动物能够在食物资源稀缺的环境中生存。例如，许多爬行动物可以依靠昆虫或小猎物的饮食生存，使它们适合在大型捕食者主导的栖息地中生活。此外，在极端寒冷的时期，一些变温动物可以进入一种休眠状态，显著降低其代谢率，直到条件改善。然而，对环境温度的依赖也给变温动物带来了挑战。它们的活动水平、生长速度和繁殖成功与环境温度密切相关。例如，温度的突然下降可能会减缓变温动物的代谢，使其变得迟钝，容易受到捕食。此外，气候变化对这些动物构成了重大威胁，因为气温上升可能会破坏它们的自然栖息地，导致种群减少。许多变温动物已经在经历分布范围的变化，试图寻找适合生存的气候。总之，变温动物在我们的生态系统中发挥着重要作用，作为食物链中的捕食者和猎物。它们对温度调节的独特适应能力突显了我们星球生命的多样性以及生物与其环境之间的复杂联系。虽然它们具有明显的优势，如能量效率，但由于对外部温度的依赖，它们也面临着重大挑战。随着我们继续研究和理解变温动物的复杂性，保护它们的栖息地并应对气候变化的影响变得至关重要，以确保它们在未来几代人的生存。