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高中英语作文：五颜六色的珊瑚礁(Colorful coral reefs)
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高中英语作文：五颜六色的珊瑚礁(Colorful coral reefs) 1
gaze at the vivid yellows, blues, and psychedelic swirls of a single emperor angelfish and youll sense the whimsy of evolution. go on to eplore its home in lush coral reefs and youll soon hit sensory overload, assaulted by colors and patterns that range from sublime to garish. coral reefs are unquestionably the worlds most colorful places. but why?
for reasons known only to nature, color eplodes across coral reefs, making them earths most vivid landscapes. here in the shallows of a fijian reef, brilliant soft corals wave in reds, pinks, and yellows as schools of fairy basslets flash orange and violet hues. the basslets different colors aid in species identification, mate recognition, and even camouflage as individuals mass against the kaleidoscope of the reef. what humans see lighted by a photographers bright strobe may look altogether different in natural light through the eyes of reef creatures. scientists are now beginning to learn how wavelengths of light (and therefore color) change through water at different distances, and—more important—how fish see colors and what messages they might communicate.
bold horizontal bands of black, white, and yellow pop out on a well-lighted sweetlips (plectorhinchus polytaenia) in indonesia. the pattern and colors actually help distort the fishs outline when seen in natural light at a distance through water, helping the animal disappear from the view of potential predators. nearby, a neon cleaner wrasse also wears stark stripes. these little fish eat parasites off the flesh and mouths of other fish. the wrasses stripes may signal that it is a useful helper rather than a ready meal. neon wrasses vary in coloration geographically. a yellow cast near the head (as shown here) indicates an indonesian species; in fiji many neon wrasses have a yellow blaze near the tail.
the pacific blue tang (paracanthurus hepatus)—also known as the artists pallette surgeonfish due to the shape of the dark patch on its body—was immortalized by the character dory in the film finding nemo. unlike that benignly daft creature, this real-life surgeonfish in indonesia carries a sharp retractable blade of bone near the base of its tail. the tails yellow blaze gives potential foes fair warning: armed and dangerous.
a leaf scorpionfish (taenianotus triacanthus) scouts for errant fairy basslets in fijian waters. this ambush predator can change its color to blend with its surroundings. it then lies still, waiting for prey to pass by. "we saw this fish pounce a couple of times," says photographer tim laman. "his mouth shot out and back in a fraction of a second."
a crescent-tailed bigeye (priacanthus hamrur) seems to wear its emotions on its sleeve—or on its whole body. this sequence of three frames of the same fish shows how it can change from largely silver to striped to solid orange-red, a transformation that occurs in a matter of seconds. pigment cells in its skin, called chromatophores, allow it to change color, but scientists dont yet know what each color pattern signifies. sometimes a sudden shift in color can be used to startle potential predators or threaten intruders. red light dissipates beyond about 30 feet (10 meters), so the reddish hue of this fish would appear black in deeper waters, allowing some degree of invisibility for this nocturnal hunter.
高中英语作文：五颜六色的珊瑚礁(Colorful coral reefs) 2
In the vast and mysterious blue expanse of our oceans, lies a vibrant and diverse underwater kingdom – the coral reefs. These underwater treasures are not only a testament to natures intricate beauty but also crucial ecosystems that support a myriad of marine life. The coral reefs, with their dazzling array of colors, form a vibrant tapestry beneath the waves, painting a picture of unparalleled wonder and enchantment.
The colors of coral reefs are as diverse as the life they support. From the deepest hues of crimson and purple, to the vibrant shades of yellow, green, and blue, these reefs create a mesmerizing spectacle that captivates divers and snorkelers alike. Each color serves a unique purpose, reflecting the corals health, the type of algae it hosts, and the depth of the water. For instance, the vibrant hues of some corals are derived from symbiotic algae called zooxanthellae, which provide the coral with nutrients in exchange for shelter and protection.
One of the most striking features of coral reefs is their ability to create a diverse range of habitats within a relatively small area. Hard corals, with their limestone skeletons, form intricate structures that provide shelter and breeding grounds for countless species. From tiny crustaceans to giant sea turtles, coral reefs are a bustling metropolis of life. The soft corals, on the other hand, add a delicate touch to this underwater landscape, their flowing tentacles waving gracefully in the current, enticing fish and other marine creatures to explore their intricate mazes.
The beauty and importance of coral reefs extend far beyond their aesthetic appeal. They are considered the "rainforests of the sea," as they are among the most productive ecosystems on Earth. Coral reefs support a quarter of all marine species, making them vital for maintaining biodiversity and the overall health of our oceans. They also provide essential services to humans, including food security, coastal protection from storms and erosion, and recreational opportunities that contribute significantly to local economies.
However, the fragility of coral reefs and their vulnerability to human activities pose a grave threat to their existence. Pollution, overfishing, climate change, and coral bleaching caused by rising sea temperatures are just a few of the many challenges facing these underwater wonders. It is imperative that we take immediate action to protect and preserve coral reefs, recognizing their invaluable contribution to our planets biodiversity and the well-being of future generations.
In conclusion, the colorful coral reefs are a marvel of nature, a living testament to the beauty and complexity of our oceans. They are not just a source of wonder and amazement but also vital ecosystems that sustain countless species and support human life in numerous ways. Let us cherish and protect these underwater treasures, ensuring that their vibrant hues continue to grace the depths of our oceans for generations to come.
高中英语作文：五颜六色的珊瑚礁(Colorful coral reefs) 3
In the vast expanse of the oceans depths, nature has woven asets tapestry of breathtaking beauty—the vibrant and diverse coral reefs. These underwater gardens, teeming with life and painted in hues that rival even the most vivid sun, are not only a marvel to behold but also vital ecosystems that support a myriad of species.
As one descends into the blue abyss, the first glimpse of a coral reef is like stepping into a kaleidoscope of colors. Reds as deep as rubies, blues resembling the clearest sky, greens that mimic the freshness of emerald forests, and oranges that glow like warm fires—all these and more coexist harmoniously, creating a spectacle that defies description. The coral polyps, the tiny organisms that form the foundation of these reefs, work tirelessly to construct their calcium carbonate skeletons, which, over time, accumulate into the intricate structures we see today. Each species of coral contributes its unique hue to this underwater masterpiece, turning the ocean floor into a living tapestry.
The beauty of coral reefs, however, extends far beyond their aesthetic appeal. They are among the most biodiverse ecosystems on Earth, supporting over a quarter of all marine species. From the tiny crustaceans scuttling across the reef floor to the majestic schools of fish darting through the coral branches, every crevice and crevice is home to a complex web of life. Sea turtles feed on the abundant seaweed, while sharks patrol the waters, maintaining balance within the ecosystem. Even humans benefit indirectly from coral reefs, as they protect shorelines from erosion, provide food and livelihoods for coastal communities, and act as nurseries for many commercially important fish species.
Yet, despite their vital role and stunning beauty, coral reefs are facing an unprecedented crisis. Climate change, pollution, overfishing, and destructive fishing practices like dynamite fishing and coral mining are taking a heavy toll on these fragile ecosystems. Rising sea temperatures cause coral bleaching, a process where corals expel the symbiotic algae living within their tissues, leaving them vulnerable to disease and death. If left unchecked, these threats could lead to the irreversible loss of coral reefs, with devastating consequences for both marine biodiversity and human well-being.
Therefore, it is imperative that we take action to protect these colorful wonders of the ocean. This includes reducing greenhouse gas emissions to mitigate climate change, implementing stricter regulations to curb pollution and overfishing, and promoting sustainable tourism practices that minimize the impact on coral reefs. By working together, we can ensure that future generations will still be able to marvel at the breathtaking beauty and incredible diversity of coral reefs, and appreciate the irreplaceable role they play in maintaining the health of our planets oceans.
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