Edge effect on a Neritina virginea (Neritimorpha, Neritinidae) population in a black mangrove stand (Magnoliopsida, Avicenniaceae: Avicennia germinans) in the Southern Caribbean
Edge effect on a Neritina virginea (Neritimorpha, Neritinidae) population in a black mangrove stand (Magnoliopsida, Avicenniaceae: Avicennia germinans) in the Southern Caribbean
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对南加勒比海黑红树林（木兰科，白骨壤科：白骨壤）中白骨壤（Neritimorpha，Neritinidae）种群的边缘效应
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Blanco
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作者：
Viviana Amortegui;Alexander Taborda;J. Blanco
加勒比地区，特别是乌拉巴湾（哥伦比亚）的红树林受到选择性伐木和转变为牧场和农田的严重威胁。具体而言，二十世纪期间，大面积的白骨壤盆地林地被转变为牧场，从而使底栖动物群受到边缘效应的影响。我们测量了这种对数量上占优势的腹足动物（Neritina virginea）种群的影响。尽管它能抵抗自然干扰，但它对极端的人为干扰很敏感，因此它是盆地红树林转变为牧场的良好生物指标。森林结构变量、土壤质地、孔隙水特性以及蜗牛密度和大小是在牧场、牧场-红树林边缘和红树林内部的样方中测量的。蜗牛丰度从红树林内部到边缘急剧减少，然后逐渐向牧场减少。牧场中的个体主要>10毫米，与内部发现的个体相比，它们经常表现出外壳腐蚀。从内部到牧场，土壤温度和 pH 值（除了氧气）有所增加，这与树冠开放度一致。红树林边缘的出现导致整个生态系统显着恶化；然而，维吉尼亚猪笼草（数量、大小、壳腐蚀）可用作在红树林-牧场边缘观察到的小生境和小气候差异的可靠的短期到中期指标。
Mangroves in the Caribbean and particularly in the Uraba Gulf (Colombia) are strongly threatened by selective logging and conversion to pastures and croplands. Specifically, extensive Avicennia germinans- basin stands were converted to pastures during the twentieth century, thus exposing benthic fauna to an edge effect. We measured this effect on the population of a numerically dominant gastropod (Neritina virginea). Despite its resistance to natural disturbances, it is sensitive to extreme anthropogenic disturbances, and it would therefore be a good biological indicator of basin-mangrove conversion to pastures. Forest structure variables, soil texture, porewater properties and snail density and size were measured in quadrats placed in pastures, pasture-mangrove edges, and mangrove interiors. Snail abundance sharply decreased from the mangrove interior to the edge and then gradually towards the pastures. Individuals in the pasture were predominantly >10mm, and they frequently exhibited shell corrosion compared to individuals found in the interior. There were increases in soil temperature and pH (but oxygen) from interior to pasture consistent with canopy openness. The occurrence of the mangrove edges has led to a marked ecosystem-wide deterioration; however, N. virginea (abundance, size, shell corrosion) could be used as a reliable short to midterm indicator of microhabitat and microclimatic differences observed across mangrove-pasture edge.