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Nutritional condition of two coastal rocky fishes and the potential role of a marine protected area

机译：两种沿海岩石鱼类的营养状况和海洋保护区的潜在作用

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Knowledge of the nutritional conditions of coastal commercial fish populations is key to understanding stock health status, and is essential when making reasonable exploitation and management plans. Here, we present the first results on the condition and feeding preferences of two coastal fish species, Diplodus sargus (Linnaeus, 1758) and Pagellus erythrinus (Linnaeus, 1758). Using stable isotope and biochemical analyses, we tested the potential effects of a marine protected area (MPA) and the occurrence of a dramatic coastal storm on the condition and quality of nutrition. The results suggest that both condition (lipids) and nutrition quality (fatty acids, FAs) in P.erythrinus and D.sargus depend upon on food availability in the area in which they were captured. Pagellus erythrinus individuals inside the MPA stored higher quantities of lipids [46.73±19.00μg lipid·mg organic matter (OM)−1] than those outside the MPA (15.63±5.30μg lipid·mg OM−1) only before the storm. Diplodus sargus showed different FA signatures inside and outside the MPA before and after the storm. These results suggest that D.sargus increased their quality of nutrition inside (16.62±3.17μg FA·mg OM−1) versus outside (7.88±2.36μg FA·mg OM−1) the MPA, owing to increased food diversity and availability. Conversely, P.erythrinus did not show differences in nutritional quality inside (18.12±1.13μg FA·mg OM−1) or outside (18.81±1.42μg FA·mg OM−1) the MPA, possibly because of the increase in ingestion not affecting the studied parameters. In P.erythrinus, the FA concentration decreased after the storm, but in D.sargus, a change in lipid composition was observed. These results suggest that P.erythrinus appears to be more impacted by food quality (different saturated and unsaturated FAs) than D.sargus, owing to a more restrictive diet. We hypothesize that the observed differences between inside and outside the MPA are not only related to the degree of protection, but also to the feeding preferences and behaviour of both fishes.
机译：了解沿海商品鱼种群的营养状况是了解种群健康状况的关键，并且在制定合理的开发和管理计划时至关重要。在这里，我们对两种沿海鱼类Diplodus sargus（Linnaeus，1758）和Pagellus erythrinus（Linnaeus，1758）的状况和摄食偏好提出了第一个结果。使用稳定的同位素和生化分析，我们测试了海洋保护区（MPA）的潜在影响以及发生剧烈的沿海风暴对营养状况和质量的影响。结果表明，P.erythrinus和D.sargus中的状况（脂质）和营养质量（脂肪酸，FAs）都取决于捕获它们的地区的食物供应。仅在暴风雨来临之前，MPA内的红皮人体内存储的脂质量[46.73±19.00μg脂质·mg有机物（OM）-1]高于MPA以外的脂质（15.63±5.30μg脂质·mg OM-1）。暴风雨前后，梁龙在MPA内外均显示出不同的FA签名。这些结果表明，由于增加了食物的多样性和可利用性，D.sargus提高了MPA内部（16.62±3.17μgFA·mg OM-1）的营养质量，而外部（7.88±2.36μgFA·mg OM-1）提高了营养质量。相反，红藻在MPA内部（18.12±1.13μgFA·mg OM-1）或外部（18.81±1.42μgFA·mg OM-1）未显示营养质量差异，可能是由于摄入增加所致。影响研究的参数。在暴风雨后的红藻中，FA的浓度降低，但是在暴龙中，观察到脂质成分的变化。这些结果表明，由于饮食限制，红藻对食物质量（饱和和不饱和脂肪酸的不同）的影响似乎比D. sargus更大。我们假设，MPA内部和外部之间观察到的差异不仅与保护程度有关，而且还与两种鱼类的摄食偏好和行为有关。

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