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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Green urchin as a significant source of fecal particulate organic matter within nearshore benthic ecosystems
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Green urchin as a significant source of fecal particulate organic matter within nearshore benthic ecosystems

机译：绿色海胆是近岸底栖生态系统中粪便颗粒有机物的重要来源

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The role of green sea urchin Strongylocentrotus droebachiensis as a source of fecal particulate organic matter (POM) for the benthic nearshore ecosystems has been studied over a 3.5-month period. Three macroalgae were tested as food sources: Alaria esculenta, Laminaria longicruris and Ulvaria obscura. Urchins were fed ad libitum with either a single alga species or a mixture of all three algae. Consumption and defecation rates were determined as well as the feces/alga ratio in term of biomass and biochemical composition, Consumption rate increased exponentially with urchin Size and also varied with alga species. In the single alga trial, consumption rate was higher for both brown algae (Laminaria and Alaria) compared to Ulvaria. Urchins feeding on the mixture of algae maintained their total ingestion rate (sum of the three algae) at the same level to those feeding on a single alga diet. The mixed algae trial showed that urchins clearly preferred Laminaria (72% of total ingestion) over Alaria (22%) and Ulvaria (6%). The defecation rate was tightly correlated with the food consumption rate and thus increased with urchin size. On average, 75% of the ingested algal biomass was released as fecal POM. The percentage of food defecated changed with alga species, with the highest value for Alaria (81 %) and the lowest for Laminaria (67%). The percentage of food defecated by urchins feeding on the mixture of algae was generally comparable to those feeding on single alga diet. Biochemical composition (in soluble carbohydrates, proteins and lipids) of urchin fecal POM reflected that of the algae content. From 40% to 80% of macronutrients in algal food persisted in fecal matter. This proportion varied with the alga species and macronutrient considered. This study shows that the green sea urchin plays a significant role in the production of POM within nearshore benthic ecosystems, and it is a potentially nutritious food source for detritivores.
机译：在3.5个月的时间内，研究了绿海顽童droebachiensis作为底栖近岸生态系统粪便颗粒有机物（POM）来源的作用。对三种大型藻类作为食物来源进行了测试：Alaria esculenta，Laminaria longicruris和Ulvaria obscura。随意给海胆喂食一种藻类或所有三种藻类的混合物。确定了消耗量和排便率，以及粪便/藻类的生物量和生化组成比例，其消耗率随海胆尺寸呈指数增加，并且随藻类种类而变化。在单一藻类试验中，褐藻（Laminaria和Alaria）的食用率均高于Ulvaria。饲喂藻类混合物的海胆将其总摄入速率（三个藻类的总和）维持在与单一藻类饮食饲喂的水平相同的水平。混合藻类试验显示，相比于Alaria（22％）和Ulvaria（6％），海胆明显更喜欢Laminaria（占总摄入量的72％）。排便率与食物消耗率紧密相关，因此随海胆尺寸而增加。平均而言，摄入的藻类生物量的75％作为粪便POM释放出来。排泄食物的百分比随藻类的变化而变化，其中阿拉里亚的最高值（81％）和海带最低的值（67％）。以海藻混合物为食的海胆排便的食物百分比通常与以单一藻类饮食为食的食物可比。野孩子粪便POM的生化成分（以可溶性碳水化合物，蛋白质和脂质计）反映了藻类含量。藻类食物中40％至80％的大量营养素残留在粪便中。该比例随藻类和大量营养素的不同而变化。这项研究表明，绿海胆在近岸底栖生态系统内的POM产生中起着重要作用，并且它是有害生物的潜在营养食品。

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