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首页> 外文期刊>Marine ecology >Spatio-temporal variation in biomass of the deep-sea red crab Chaceon affinis in Gran Canaria Island (Canary Islands, Eastern-Central Atlantic)
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Spatio-temporal variation in biomass of the deep-sea red crab Chaceon affinis in Gran Canaria Island (Canary Islands, Eastern-Central Atlantic)

机译：大加那利岛（加那利群岛，中东部大西洋）深海红蟹Chaceon affinis生物量的时空变化

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摘要

The spatial and temporal biomass distribution of Chaceon affinis and its vulnerability to fishing activity in Gran Canaria (Canary Islands) were investigated. The first goal was to assess the influence of the slope steepness and substrate on the size of crab patches, size of the crabs, and crab biomass. The second goal was to evaluate spatial and temporal variation in the biomass over a 15-month period. The last goal was to assess the influence of fishing activity upon the reduction in the biomass over the same 15-month period. Only two or three locations in the sampling area generated high-biomass contour patches. When these patches were superimposed on the isobath lines, they were coincident with the main depth range described for the species in the area. The map of the biomass values clearly showed three structures with cores of the highest biomass in both muddy and rocky-muddy areas. The biomass was higher on muddy than on rocky-muddy bottoms. Biomass was twice as high when steepness was reduced to one third between isobaths of 500 and 900 m. The size of crab patches increases linearly with the decrease in slope steepness. The spatial structure of crabs remained fairly stable over time, showing that biomass changes with depth over time. Maps of the estimated biomass values over the 15-month period showed the same two main patches over time with the cores of highest biomass separated by a distance of between 4.2 and 4.5 km. Although the bathymetric distribution by sexes showed temporal changes, with a displacement to deeper areas made by both sexes over the studied period, only a partial temporal segregation between males and females was observed. During the study period, crabs underwent a significant decline in biomass and this was consistent with the combined catches of both commercial and experimental fishing in the area. Due to its low mobility, C.affinis is highly vulnerable to local depletion by intensive fishing efforts.
机译：研究了大加那利岛（加那利群岛）Chaceon affinis的时空生物量分布及其对捕捞活动的脆弱性。第一个目标是评估坡度和底物对螃蟹斑块尺寸，螃蟹尺寸和螃蟹生物量的影响。第二个目标是评估15个月内生物量的时空变化。最后一个目标是评估相同15个月内捕捞活动对生物量减少的影响。采样区域中只有两个或三个位置生成了高生物量的轮廓斑块。当这些斑块叠加在等压线上时，它们与该地区所描述物种的主要深度范围一致。生物量值图清楚地显示了三个结构，在泥泞和多泥的地区都具有最高生物量的核心。泥质的生物量高于泥质的底部。当在等高线500和900 m之间将陡度减小到三分之一时，生物量是原来的两倍。螃蟹斑块的大小随着坡度的减小而线性增加。螃蟹的空间结构随时间保持相当稳定，表明生物量随深度而变化。 15个月期间生物量估计值的地图显示了随时间变化的两个主要斑块，其中生物量最高的核心之间的距离为4.2至4.5 km。尽管按性别划分的测深分布显示出时间变化，但在研究期间，随着性别向更深区域转移，但仅观察到了男性和女性之间的部分时间隔离。在研究期间，螃蟹的生物量显着下降，这与该地区商业捕鱼和实验捕鱼的总捕获量一致。由于其流动性低，C.affinis在密集的捕捞努力下极易遭受当地消耗。

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  • 来源
    《Marine ecology》 |2017年第5期|e12462.1-e12462.14|共14页
  • 作者

    Triay-Portella Raul; Pajuelo Jose G.; Gonzalez Jose A.;

  • 作者单位

    Univ Las Palmas Gran Canaria, Inst Univ Estudios Ambientales & Recursos Nat iUN, Grp Ecol Marina Aplicada & Pesquerias, Las Palmas Gran Canaria, Las Palmas, Spain;

    Univ Las Palmas Gran Canaria, Inst Univ Estudios Ambientales & Recursos Nat iUN, Grp Ecol Marina Aplicada & Pesquerias, Las Palmas Gran Canaria, Las Palmas, Spain;

    Univ Las Palmas Gran Canaria, Inst Univ Estudios Ambientales & Recursos Nat iUN, Grp Ecol Marina Aplicada & Pesquerias, Las Palmas Gran Canaria, Las Palmas, Spain;

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  • 正文语种 eng
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  • 关键词

    biomass; Chaceon affinis; deep-sea red crab; spatio-temporal variation;

    机译：生物量;柴犬近亲;深海红蟹;时空变化;生物量;

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