The "rounded" sea monks:
In the eyes of Liu Hung-chang, each crab species is special. They all differ in behavior and appearance. Ghost crabs whisk along quick of foot. Male fiddler crabs have one small claw and one large one, giving them unusual proportions. In their movement and behavior, soldier crabs simply don't look like crabs. Rather than scurrying everywhere sideways, they move straight. "Not all crabs move sideways," says Liu, a long-time observer of crabs. "And not all of them have sharp double claws and a large mouth."
Liu conjectures that among the crabs of the seashore, soldier crabs were perhaps one of the earliest to leave the sea for the land. The earliest to get on dry land, their gills have changed, taking on some of the functions of lungs and allowing them to breathe on land. Their round shape has allowed for the expansion of the gill chambers; in this they differ markedly from the flat bodies of other crabs.
From April to June, clumps that look like small round chimneys appear on the sands. "This means that the baby soldier crabs have come on land," Liu explains. Because their eggs are bigger, a young river crab can develop entirely within the egg. For crabs in tidal zones, the young must return to the sea to live. After they shed their shells several times, they return to land where they dig holes to live in. They pile the excavated sand outside, and the result looks like small chimneys. A young crab develops into an adult in a year.
"But the age of a crab is more of a mystery than the age of a woman," Liu says. Crabs shed their shells every several months, and they thoroughly change their entire bodies, "completely making themselves over." Even their organs, such as the inside wall of their stomachs and intestines, are completely remade. And hence it is hard to tell the age of a crab by looking at its body. "We are ignorant about a lot of crab behavior."
Making a last stand with the crabs:
But how much more time does Liu have to try to under stand the crabs of Taiwan? According local government plans, in addition to such facilities as the Hsinchu airport, the shore will be the site of a tourist area that can hold 3 million visitors. Because the government estimates that the population will approach 1 million after Hsinchu County and City are merged, in the blueprints for development of residential areas, sewage treatment plants and garbage dumps have all been planned for the coast.
What effect would the landfill project have on the sand crabs? "Without the beach, the sea water won't be able to come up, and they will lack nutrients, food and water. How can the sand crabs, which need to go to the tide line to get their gills wet when the tide is rising, live on?" says Liu, feeling that the loss is as much his as the crabs. He is even more worried that after this land is developed, it will become like Nanliao, Hsinchu's only operating seaside amusement park, "covered with litter, its water yellow and dirty, its air full of thick smoke!"
Hsinchu is at the narrowest point of the Taiwan Strait. Because of topographical reasons, it is the windiest spot in all of Taiwan. In the winter, there are often sand storms along the coast. Once the county government began building a residential development on the mountain slopes, but the wind was so strong it couldn't be completed. In the winter, people simply can't stand the northeast winds. Liu, who has carried out detailed research on estimating the environmental effects of the industrial area, is baffled and says, "Who would be willing to live here?" While the profits to be made by building along the coast are few, the site is well suited to be an ecological classroom.
The world in one grain of sand:
Specializing in crab ecologies, Liu, whose skin has been tanned a deep brown, says people may feel that this place left in its natural state would be unproductive, unable to help the county raise money. "But little kids feel that crabs are extremely cute." Many Hsinchu elementary schools come here for their ecological studies programs. Liu is the best ecological teacher. "If you bring kids here to look at crabs, when you want to leave, you can shout all you want, but you won't be able to get the kids to line up."
But crabs are more than just fun. Because of a high salt content, few species are suitable for living in eulittoral zones. But because there are many organisms being washed out of the river mouths, the food is plentiful, and the populations of the species that do exist here are always large. This is especially the case for the countless number of small crabs. When they return to the sea, most of them become a major source of food for marine life.
The crabs in eulittoral zones are an important base-level consumer in the food chain. They play an important role in the ecological system. They break down pollutants, turning them into inorganic substances, which flow out with the tide to become food for algae, which become food for fish, which in turn end up on our dinner tables.
At the hearing for the landfill development plans at Hsiangshan, Liu did, of course, do his best to beg for mercy for the crabs, explaining the meaning they hold for people. But he knows it's beyond his power to get people to leave behind this chunk of natural coastline for the next generation to decide how to use.
Paradise by the sea:
"In the future, I'll go to some uninhabited island to do my research," he says. A lot of land crabs live on such islands. On Christmas Island off Australia, for instance, there is a colony of more than 100 million crabs of one species. Every year, during their migration, the sight is magnificent. "On an uninhabited island, I would be the crabs' one and only enemy."
Liu, though understanding crabs best, would make a pushover of a predator.
[Picture Caption]
p.18
At the end of this year along the Hsiangshan Coast of Hsinchu, landfill will be used to create 1000 hectares of new land. If the tidal areas are lost, so will the sight of solider crabs gathering together in their battalions.
p.20
A sand beach, which may seem like a dull and dreary place, is actually teeming with life. Liu Hung-chang, a researcher of crabs, can spend hours at a time here. (photo by Cheng Yuan-ching)
p.22
Marching back and forth, soldier crabs are rounded on both sides. Not in awe of men, they often gather in groups and stand guard in their holes, like "courageous crab soldiers." The crab larva in this picture still has to shed its shell one time before it looks like a young crab.
p.24
In carrying out his investigations on the Hsiangshan coast of Hsinchu, Liu Hung-chang has recorded more than 30 kinds of crabs. After the tide recedes, the beach is littered with the small clumps of sand that crabs have removed from their holes. On the left from top to bottom, there is a "white-fan" fiddler crab, a soldier crab, and a Helice formosensis. On the right is a ghost crab, which can create noise by rubbing its antennae against its head, and a "net" fiddler crab, with a characteristic"smiling face" on its back.