planula

简明释义

英[ˈplænjʊlə]美[ˈplænjələ]

n. 浮浪幼体

复 数 p l a n u l a e

英英释义

单词用法

同义词

反义词

例句

1.The planula 幼虫 eventually settles on a substrate to form a new polyp.

该planula 幼虫最终在基质上定居，形成新的水螅。

2.After fertilization, the coral eggs hatch into free-swimming planula 幼虫.

受精后，珊瑚卵孵化成自由游动的planula 幼虫。

3.Researchers are studying how environmental factors affect the survival of planula 幼虫 in coral reefs.

研究人员正在研究环境因素如何影响珊瑚礁中planula 幼虫的存活。

4.The marine biologist observed the development of the planula 幼虫 in the laboratory.

海洋生物学家在实验室观察了planula 幼虫的发育。

5.The lifecycle of jellyfish includes a stage where it releases planula 幼虫 into the ocean.

水母的生命周期包括一个阶段，在这个阶段它将planula 幼虫释放到海洋中。

作文

The ocean is a vast and mysterious place, home to countless organisms that exhibit fascinating life cycles. One of the most intriguing stages in the life cycle of certain marine animals, particularly cnidarians like jellyfish and corals, is the formation of the larval stage known as planula. A planula (幼虫) is a free-swimming larval form that typically arises from the fertilization of eggs in the water. This stage is crucial for the dispersal of the species and plays a significant role in the overall life cycle of these organisms.When a jellyfish reproduces, it releases eggs and sperm into the water, where fertilization occurs. The resulting zygote develops into a planula (幼虫), which is characterized by its elongated, oval shape and ciliated surface. These tiny larvae are equipped with tiny hair-like structures called cilia, which allow them to swim freely through the water column. The planula (幼虫) is not merely an accidental byproduct of reproduction; it serves a vital purpose in the life cycle of marine organisms.The primary function of the planula (幼虫) is to find a suitable substrate to settle on and metamorphose into the next stage of development. For example, when a planula (幼虫) finds a suitable surface, such as a rock or coral reef, it attaches itself and undergoes a transformation into a polyp, which is the sessile adult form of the organism. This transition is critical because it allows the organism to establish itself in a specific habitat, where it can grow and eventually reproduce.The ability of the planula (幼虫) to disperse over long distances is essential for the genetic diversity of marine populations. By drifting with ocean currents, planulae (幼虫) can colonize new areas, ensuring that the species can thrive in various environments. This dispersal mechanism is especially important in the face of changing ocean conditions, such as temperature fluctuations and habitat loss due to human activities.Moreover, the planula (幼虫) stage also highlights the interconnectedness of marine ecosystems. As these larvae travel through the ocean, they become part of the food web, serving as a food source for various small fish and other marine creatures. This interaction emphasizes the importance of preserving marine habitats to maintain the delicate balance of life in the ocean.In conclusion, understanding the role of the planula (幼虫) in the life cycle of marine organisms provides insight into the complexities of ocean ecosystems. From its function in reproduction and dispersal to its significance in maintaining biodiversity, the planula (幼虫) is a remarkable example of nature's ingenuity. Protecting our oceans and their inhabitants is crucial, as every stage of life, including the humble planula (幼虫), contributes to the intricate tapestry of marine life. By fostering awareness and taking action to conserve marine environments, we can ensure that future generations will continue to marvel at the wonders of the ocean and the diverse organisms that inhabit it.

海洋是一个广阔而神秘的地方，栖息着无数展现迷人生命周期的生物。在某些海洋动物（特别是水母和珊瑚等腔肠动物）的生命周期中，一个引人入胜的阶段是形成一种被称为planula（幼虫）的幼体阶段。planula（幼虫）是一种自由游动的幼虫形式，通常由水中的卵子受精而产生。这个阶段对物种的传播至关重要，并在这些生物的整体生命周期中发挥重要作用。当水母繁殖时，它会将卵子和精子释放到水中，进行受精。由此产生的合子发展成planula（幼虫），其特征是呈椭圆形且表面有纤毛。这些微小的幼虫配备了称为纤毛的微小毛发结构，使它们能够自由地在水柱中游动。planula（幼虫）并不仅仅是繁殖的偶然产物；它在海洋生物的生命周期中具有重要的目的。planula（幼虫）的主要功能是寻找合适的基质附着并蜕变为下一个发育阶段。例如，当planula（幼虫）找到合适的表面，例如岩石或珊瑚礁时，它会附着在上面并经历转变为水螅，这是生物的固定成年形式。这一转变至关重要，因为它使生物能够在特定栖息地中建立自己，从而可以生长并最终繁殖。planula（幼虫）能够远距离扩散的能力对于海洋种群的遗传多样性至关重要。通过随海洋洋流漂流，planulae（幼虫）可以殖民新区域，确保物种能够在各种环境中繁荣。这种扩散机制在应对变化的海洋条件（如温度波动和因人类活动造成的栖息地丧失）时尤其重要。此外，planula（幼虫）阶段还突出了海洋生态系统之间的相互联系。当这些幼虫在海洋中游荡时，它们成为食物网的一部分，为各种小鱼和其他海洋生物提供食物来源。这种互动强调了保护海洋栖息地的重要性，以维持海洋生命的微妙平衡。总之，理解planula（幼虫）在海洋生物生命周期中的作用为我们提供了对海洋生态系统复杂性的洞察。从其在繁殖和扩散中的功能到其在维持生物多样性中的重要性，planula（幼虫）是大自然巧妙的一个显著例子。保护我们的海洋及其居民至关重要，因为生命的每个阶段，包括谦卑的planula（幼虫），都为海洋生命的复杂织锦做出了贡献。通过提高意识并采取行动保护海洋环境，我们可以确保未来的世代能够继续惊叹于海洋的奇迹以及栖息其中的多样生物。