Variation in consumer pressure along 2500 km in a major upwelling system: crab predators are more important at higher latitudes
Variation in consumer pressure along 2500 km in a major upwelling system: crab predators are more important at higher latitudes
复制标题
主要上升流系统沿 2500 公里的消费者压力变化：螃蟹捕食者在高纬度地区更为重要
作者：
C. A. Musrri;A. Poore;I. Hinojosa;E. Macaya;A. Pacheco;A. Pérez‐Matus;Oscar Pino;Nicolás Riquelme;W. Stotz;N. Valdivia;Vieia Villalobos;M. Thiel
据预测，低纬度底栖动物群落的消费者压力比高纬度地区更大，但对这种模式的支持一直不明确，特别是对草食动物。为了了解生物相互作用的大范围变化，我们量化了智利海岸(19°S-42°S)2500公里的消费(捕食和食草)。我们在十个地点用三种不同的诱饵进行了系绳试验：螃蟹作为捕食者的活猎物，干鱿鱼作为捕食者/食腐动物的死亡猎物，以及海藻Lessonia spp。对于食草动物来说。水下视频被用来描述消费者群体的特征，并识别那些消费诱饵的物种。甲壳类和盲目鱼类的消费者种类组成、出现频率和最大丰度(MaxN)。不同地点的情况有所不同。赤潮鱼和海带的摄食量不随纬度变化，而鱿鱼饵在中高纬度的摄食量较快。这可能是因为捕食性螃蟹的出现增加，这与2小时后对鱿鱼的摄入量呈正相关。在30°S以南的地点，螃蟹而不是鱼是鱿鱼诱饵的主要消费者(占所有有记录的捕食事件的91%)。鱼类和甲壳类以类似比例捕食拉氏对虾，大多数鱼类的捕食事件发生在北部地点。被拴住的猎物的消耗率没有任何强烈的纬度模式，可能是由于纬度范围内消费者的冗余，甲壳类动物的重要性随着纬度的增加而增加，可能取代鱼类成为关键的捕食者。
Consumer pressure in benthic communities is predicted to be higher at low than at high latitudes, but support for this pattern has been ambiguous, especially for herbivory. To understand large-scale variation in biotic interactions, we quantify consumption (predation and herbivory) along 2500 km of the Chilean coast (19°S–42°S). We deployed tethering assays at ten sites with three different baits: the crab Petrolisthes laevigatus as living prey for predators, dried squid as dead prey for predators/scavengers, and the kelp Lessonia spp. for herbivores. Underwater videos were used to characterize the consumer community and identify those species consuming baits. The species composition of consumers, frequency of occurrence, and maximum abundance (MaxN) of crustaceans and the blenniid fish Scartichthys spp. varied across sites. Consumption of P. laevigatus and kelp did not vary with latitude, while squid baits were consumed more quickly at mid and high latitudes. This is likely explained by the increased occurrence of predatory crabs, which was positively correlated with consumption of squidpops after 2 h. Crabs, rather than fish, were the principal consumers of squid baits (91% of all recorded predation events) at sites south of 30°S. Fish and crustaceans preyed in similar proportion on P. laevigatus, with most fish predation events at northern sites. The absence of any strong latitudinal patterns in consumption rate of tethered prey is likely due to redundancy among consumers across the latitudinal range, with crustaceans gaining in importance with increasing latitude, possibly replacing fish as key predators.
影响因子：
14.6
作者：
Martijn Gough
通讯作者：
Martijn Gough