Comprehensive model of Jumbo squid Dosidicus gigas trophic ecology in the Northern Humboldt current system.
Comprehensive model of Jumbo squid Dosidicus gigas trophic ecology in the Northern Humboldt current system.
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DOI：
10.1371/journal.pone.0085919
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Bertrand A
中科院分区：
文献类型：
--
作者：
Alegre A;Ménard F;Tafur R;Espinoza P;Argüelles J;Maehara V;Flores O;Simier M;Bertrand A
巨型乌贼作为捕食者和猎物，在海洋食物网中扮演着重要的角色。我们研究了洪堡洋流系统北部巨型鱿鱼的个体发育和食物组成的时空变异性。为此，我们应用了几种统计方法，对2004年至2011年在秘鲁近海收集的3618条巨型鱿鱼非空胃的广泛数据集进行了分析。共鉴定出55个捕食性类群，聚为11个类群。我们的结果证明了猎物组成的很大变异性，就像在其他系统中已经观察到的那样。然而，我们的数据并不支持这样的假设，即巨型鱿鱼在猎物集合中选择最丰富或最有活力的分类单元，而忽略了其他可用的猎物。事实上，多项式模型预测表明，胃的饱满度随着猎物分类群数量的增加而增加，而大多数含量较低的胃只包含一个或两个猎物类群。因此，我们的结果质疑了常见的假设，即捕食者寻找局部密集的单一物种猎物聚集地。此外，在秘鲁，巨大的凤尾鱼消耗极少的凤尾鱼，而凤尾鱼的潜在生物量是巨大的。看起来，巨型金枪鱼无法到达靠近海岸的氧气不饱和水域，那里是凤尾鱼的主要产生地。事实上，即使巨型鱿鱼白天可以在低氧的深水中觅食，水面上的常氧水域也需要恢复其维持呼吸(或能量？)。因此，氧气浓度可以限制这两个物种的共存，从而排除捕食者和猎物之间的相互作用。最后，我们提出了一个概念模型，解释了巨型鱿鱼的机会性觅食行为，它受到个体发育迁移的影响，并可能受到地表水氧饱和度的限制。
The jumbo squid Dosidicus gigas plays an important role in marine food webs both as predator and prey. We investigated the ontogenetic and spatiotemporal variability of the diet composition of jumbo squid in the northern Humboldt Current system. For that purpose we applied several statistical methods to an extensive dataset of 3,618 jumbo squid non empty stomachs collected off Peru from 2004 to 2011. A total of 55 prey taxa was identified that we aggregated into eleven groups. Our results evidenced a large variability in prey composition as already observed in other systems. However, our data do not support the hypothesis that jumbo squids select the most abundant or energetic taxon in a prey assemblage, neglecting the other available prey. Indeed, multinomial model predictions showed that stomach fullness increased with the number of prey taxa, while most stomachs with low contents contained one or two prey taxa only. Our results therefore question the common hypothesis that predators seek locally dense aggregations of monospecific prey. In addition D. gigas consumes very few anchovy Engraulis ringens in Peru, whereas a tremendous biomass of anchovy is potentially available. It seems that D. gigas cannot reach the oxygen unsaturated waters very close to the coast, where the bulk of anchovy occurs. Indeed, even if jumbo squid can forage in hypoxic deep waters during the day, surface normoxic waters are then required to recover its maintenance respiration (or energy?). Oxygen concentration could thus limit the co-occurrence of both species and then preclude predator-prey interactions. Finally we propose a conceptual model illustrating the opportunistic foraging behaviour of jumbo squid impacted by ontogenetic migration and potentially constrained by oxygen saturation in surface waters.
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影响因子：
2.5
作者：
Gilly, W. F.;Markaida, U.;Salinas, C.
通讯作者：
Salinas, C.
影响因子：
2.4
作者：
Bertrand, A;Bard, FX;Josse, E
通讯作者：
Josse, E
DOI：
10.1016/j.dsr2.2012.09.006
发表时间：
2013-10-15
影响因子：
3
作者：
Field, John C.;Elliger, Carl;Walker, William A.
通讯作者：
Walker, William A.
影响因子：
3.3
作者：
Gerlotto, Francois;Bertrand, Sophie;Gutierrez, Mariano
通讯作者：
Gutierrez, Mariano
影响因子：
4.1
作者：
Bazzino, Gaston;Gilly, William F.;Ramos-Castillejos, Jorge
通讯作者：
Ramos-Castillejos, Jorge