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第50章 做梦(1 / 1)

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藤壶俗称“马牙”,隶属于无柄目藤壶科;鹅颈藤壶俗说称“海鸡脚”、“狗爪螺”,隶属围胸目茗荷科。因此严格说来,鹅颈藤壶并不是真正的藤壶。

近年来藤壶呈现出扩张的态势,许多海洋生物被它折腾得不成样子。

一般而言藤壶附着的地方,水流速度不宜过大,不然它有被冲散的可能;藤壶过惯了饭来张口的生活,所以会尽量选择在食物丰富的地方;附着的物体表面最好有褶皱、凹凸,利于它固定下来。经过层层筛选之后,藤壶通过分泌的胶状物把身体和附着物体粘附在一起。不过,早期藤壶存在更换附着物的情况,但一旦确定下来藤壶几乎会在这里终其一生。

2010年台湾小琉球北侧海域一只体积硕大的海龟艰难地爬上向了海滩,海龟的整个龟甲、头部被密密麻麻的藤壶覆盖,只能从形体判断它还是一只海龟。藤壶的躯体包裹着石灰质像补丁似的一个个打在龟甲上,有的藤壶堆积在一块,有的杂乱地交织在一起,凌乱不堪。要是有密集恐惧症,都不敢直视。该海龟已被藤壶折磨得遍体鳞伤,几无摄食欲望,没多久便死去了。

其实,只需看外表就可以区分藤壶和鹅颈藤壶。藤壶没有柄,圆锥一样的身体就像一座超迷你“火山”。鹅颈藤壶由柔软的圆柱形柄部和十几片壳板包裹的花序状头部组成,外形酷似鹅的脖颈,鹅颈藤壶其名也由此而来。

藤壶的幼体具有向能性的特性。海洋中附着基表面的粗糙程度、光线及颜色往往会影响藤壶腺介幼体对附着物的选择。

藤壶等附着在沿岸码头、船底、海底电缆等处,往往造成很大的危害,例如固着在船体的藤壶使航行速度大大降低[

常年远航的船只偶尔碰到鲸鱼的撞击,它们会有鱼鳍拍打船只,有时船板会掉落一些藤壶。专家解释,这种情况很多鲸鱼并不是真正地攻击人类,而是把船舶误当作了礁石,只是为了清理身上的藤壶。由于鲸鱼游弋速度太快,只有40%的鲸鱼会被藤壶附着,而且真正影响存活的更是寥寥无几。像虎鲸压根不给藤壶附着的机会,身体干净、整洁的得多。

受藤壶折磨最惨的要算海龟了。海龟动作缓慢,而且巨大的甲壳似乎成了天然的附着地。根据资料显示,至少有80%的海龟曾遭受过藤壶的摧残:有的是刚被附着,甲壳上零星露出几只;有的藤壶干脆在海龟的头部“安家落户”,不利于海龟摄食;最严重的和开篇描述的情况类似,整个海龟被藤壶附着,早已看不清海龟的模样。

然而对于海龟而言,一旦惹上藤壶,意味着这辈子将被它附着、折磨。目前而言,最直接的方法是靠人用铁铲铲掉,一些清理后的海龟爬行速度立即暴涨好几倍。所以在一些海龟保护基地,有专人负责清理海龟身上的藤壶。除此之外,大型船舶、港口设备也会定期清理藤壶,否则设备外壳使用寿命会缩减许多

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