阿根廷巴塔哥尼亚陆架拉氏南美南极鱼（<i>Patagonotothen ramsayi</i>）不同组织中脂肪酸分布及食物来源指示

杨清源; 朱国平

doi:10.3969/j.issn.0253-4193.2020.04.003

阿根廷巴塔哥尼亚陆架拉氏南美南极鱼（Patagonotothen ramsayi）不同组织中脂肪酸分布及食物来源指示

doi: 10.3969/j.issn.0253-4193.2020.04.003

杨清源^{1, 2, 3,},
朱国平^{1, 2, 3, 4, ,}

1.
上海海洋大学海洋科学学院，上海 201306
2.
上海海洋大学极地研究中心，上海 201306
3.
大洋渔业资源可持续开发教育部重点实验室极地海洋生态系统研究室，上海 201306
4.
国家远洋渔业工程技术研究中心，上海 201306

基金项目: 国家自然科学基金（41776185）；国家重点研发计划（2018YFC1406801）。

详细信息

作者简介:
杨清源（1994-），女，山东省青岛市人，研究方向为海洋生物学。E-mail：yuanzi_yang@yeah.net

通讯作者:
朱国平（1976-），男，教授，从事极地生物学与渔业生态学方面的研究。E-mail：gpzhu@shou.edu.cn

中图分类号: P714⁺.5; Q956
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出版历程
- 收稿日期: 2019-06-06
- 修回日期: 2019-09-08
- 网络出版日期: 2020-11-18
- 刊出日期: 2020-04-25

The distribution of fatty acids in tissues of rock cod (Patagonotothen ramsayi) in the Argentina Patagonian Shelf and their implications to feeding habit

Yang Qingyuan^{1, 2, 3
,},
Zhu Guoping^{1, 2, 3, 4
, ,}

1.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
2.
Center for Polar Research, Shanghai Ocean University, Shanghai 201306, China
3.
Polar Marine Ecosystem Laboratory, Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China
4.
National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China

摘要

摘要: 作为南美南极鱼科中数量最为丰富的一个种，拉氏南美南极鱼(Patagonotothen ramsayi)在巴塔哥尼亚海域食物网能量流动中起着重要的传递作用。目前针对该鱼种的营养及摄食生态学研究主要集中于反映短期摄食的传统胃含物分析上。为此，本研究分析了拉氏南美南极鱼3种组织(肌肉、肝脏和性腺)中脂肪酸含量及分布情况，并就3种组织中的脂肪酸是否能表征其食性及食性转换进行了探究。结果表明，拉氏南美南极鱼体内共检测出27种脂肪酸；由于涉及生长、繁殖等因素影响，肝脏、性腺组织对于脂肪酸的储存及使用情况并不适用于指征食性，而肌肉组织更新时间相对较长，故能够较好地反映其对食物中脂肪酸的吸收。对不同体长组拉氏南美南极鱼肌肉组织中脂肪酸分析可知，未成熟拉氏南美南极鱼(100～240 mm)主要摄食浮游性生物；随着体长增加对底栖生物的摄食也随之增加，由浮游性摄食方式转变为浮游−底栖性摄食。另外，因拉氏南美南极鱼摄食一定量的渔业丢弃物，导致腐生食物链和捕食食物链的贡献率特征弱化。研究结果进一步显示，针对大洋性鱼类，与肝脏和性腺相比，肌肉组织脂肪酸更适用于表征食物来源。
- 拉氏南美南极鱼 /
- 脂肪酸 /
- 食性 /
- 巴塔哥尼亚陆架
Abstract: As one of the most abundant species of family Notothenioidei, rock cod (Patagonotothen ramsayi) plays an important role in energy transfer in the food web in the Patagonian Shelf. Currently, the work on feeding ecology of this species mainly bases on the conventional stomach content analysis, which only reflects short-term variation in feeding. Therefore, this study analyzed the distribution of fatty acids in three tissues (muscle, liver and gonad) of rock cod, and analyzed whether fatty acids in these tissues can characterize their feeding habits and transfer of diet. The results indicate that 27 kinds of fatty acids were detected in the tissues of rock cod. The storage and use of fatty acids in liver and gonad tissues are not suitable for indicating the diet of rock cod because they are involved in growth and reproduction. Compared to liver and gonad tissues, the longer renewal cycle of muscle tissue may better reflect its absorption of fatty acids from food. For the analysis of fatty acids in the muscle tissue of the rock cod in different size groups, it is inferred that the small-size rock cod (immature individual, 100−240 mm) mainly fed on planktonic organisms. The benthic feeding characteristics of rock cod increase with the increasing of size, and the feeding pattern transfer from planktonic feeding to planktonic-benthic feeding. In addition, due to the consumption of a certain amount of fishery discards by rock cod, the contribution rate of saprophytic food chain to predatory food chain is weakened. The results derive from this study further demonstrate that, compare to tissues of liver and gonad, the fatty acids of muscle tissue can be more suitable to indicate the food source of oceanic fish species.
- rock cod /
- fatty acid /
- feeding habit /
- Patagonian Shelf

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图 1 调查区域与站点

Fig. 1 The study area with showing the sample locations

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图 2 拉氏南美南极鱼不同组织脂肪酸含量主成分分析

PC1为第一主成分贡献率，PC2为第二主成分贡献率；右方纵坐标与上方横坐标分别为样品点在PC1及PC2上的得分情况

Fig. 2 Principal component analysis plot in different tissues of the rock cod

PC1 (PC2) represents the contribution ratio of the first (second) principal component; the vertical coordinate on the right and the horizontal coordinate on the top are the scores of sample points on PC1 and PC2, respectively

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表 1 在拉氏南美南极鱼体内发现的主要脂肪酸及直接与间接食物源

Tab. 1 The main fatty acids found in the rock cod and their corresponding potential food sources

脂肪酸	直接与间接食物源	参考文献
C14:0	硅藻纲	[21]
C16:0	硅藻纲	[21]
C15:0+C17:0	浮游细菌	[22]
C16:1n7	硅藻纲	[23]
C18:1n9	褐藻/浮游动物	[24]
C18:2n6	陆源脂肪酸	[25]
C20:1+C22:1	桡足类	[26]
C20:4n6	底栖生物	[26]
C20:5n3	硅藻纲	[21]
C22:6n3	甲藻纲	[21]

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表 2 拉氏南美南极鱼体长分组

Tab. 2 The size group of the rock cod

体长组	体长范围	数量
小体长	100 mm≤L<240 mm	26
大体长	240 mm≤L	10

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表 3 拉氏南美南极鱼不同组织中脂肪酸含量

Tab. 3 Fatty acid contents in different tissues of the rock cod

脂肪酸	平均值/mg·g⁻¹
	肌肉			肝脏			性腺
	小体长	大体长	总体	小体长	大体长	总体	小体长	大体长	总体
C14:0	1.09±0.63	1.71±1.43	1.26±0.94	15.09±12.07	17.39±7.30	15.73±10.90	8.81±16.08	14.31±18.59	10.34±16.73
C15:0	0.23±0.10	0.33±0.10	0.26±0.11	1.27±0.86	0.93±0.18	1.18±0.75	1.66±1.60	1.87±2.11	1.72±1.72
C16:0	7.54±3.63	11.50±4.58	8.64±4.25	62.57±49.07	65.78±23.79	63.46±43.21	42.59±51.55	59.26±64.79	47.22±55.09
C17:0	1.37±0.80	1.64±0.69	1.45±0.77	3.14±1.03	2.67±0.19	3.01±0.90	7.94±7.37	4.07±3.10	6.86±6.66
C18:0	2.84±0.87	3.28±0.62	2.96±0.82	12.83±9.00	11.95±6.30	12.58±8.26	13.69±9.80	10.08±8.40	12.69±9.46
C20:0	1.33±0.82	1.56±0.78	1.40±0.81	2.43±0.65	2.29±0.14	2.39±0.56	7.57±7.72	3.34±2.78	6.39±6.95
C21:0	1.09±0.68	1.26±0.65	1.14±0.67	1.87±0.54	1.67±0.01	1.82±0.46	6.17±6.40	2.54±2.21	5.17±5.77
C22:0	0.47±0.29	0.55±0.27	0.49±0.29	0.82±0.23	0.74±0.01	0.80±0.20	2.21±1.94	1.15±0.98	1.91±1.78
C23:0	1.02±0.70	0.92±0.78	0.99±0.71	1.75±0.73	1.68±0.03	1.73±0.62	6.06±6.39	2.37±2.32	5.04±5.78
C24:0	0.96±0.60	1.11±0.57	1.00±0.59	1.64±0.48	1.47±0.01	1.60±0.41	5.38±5.71	2.09±2.05	4.46±5.15
SFA	17.95±6.74	23.86±5.69	19.59±6.93	103.41±70.60	106.55±36.18	104.28±62.44	102.08±83.38	101.09±100.31	101.80±86.91
C15:1n5	0.61±0.46	0.80±0.42	0.66±0.45	1.16±0.41	1.07±0.01	1.14±0.35	3.77±4.15	1.62±1.40	3.18±3.71
C16:1n7	2.40±1.24	3.32±1.41	2.65±1.34	53.82±50.09	70.35±44.18	58.41±48.48	18.61±20.97	22.26±25.20	19.62±21.91
C17:1n7	1.49±1.06	1.27±1.25	1.43±1.10	0.95±1.41	0.25±0.79	0.76±1.30	7.83±10.12	3.23±3.60	6.55±8.99
C18:1n9	5.11±3.31	7.58±4.33	5.80±3.73	133.75±146.03	151.35±86.67	138.64±131.25	38.17±49.91	54.61±66.59	42.74±54.54
C20:1	1.76±0.85	2.44±0.89	1.95±0.90	7.51±5.04	8.46±4.99	7.77±4.97	9.78±7.88	7.46±5.95	9.14±7.39
C22:1n9	1.49±0.83	2.07±0.79	1.65±0.85	3.79±1.41	4.43±1.83	3.97±1.53	8.63±7.80	7.82±8.85	8.41±7.98
C24:1n9	1.25±0.74	1.52±0.67	1.33±0.72	2.62±0.68	2.38±0.32	2.55±0.60	7.21±6.88	3.90±3.18	6.29±6.22
MUFA	14.11±5.74	19.00±6.06	15.47±6.16	203.60±197.94	238.29±130.78	213.23±180.64	94.01±81.53	100.90±107.71	95.92±87.98
C18:2n6	6.01±3.61	6.85±3.25	6.24±3.49	11.94±3.52	9.98±0.62	11.40±3.12	32.94±32.74	14.94±12.17	27.94±29.50
C18:3n6	1.49±0.92	1.73±0.87	1.56±0.90	2.64±0.73	2.36±0.06	2.56±0.63	8.43±8.64	3.60±3.11	7.09±7.78
C18:3n3	1.80±1.03	2.16±0.93	1.90±1.01	3.42±0.89	3.16±0.23	3.34±0.77	8.33±6.92	5.03±4.23	7.41±6.40
C20:2	1.46±0.85	1.71±0.77	1.53±0.82	3.04±0.77	2.74±0.16	2.96±0.67	8.14±7.97	3.80±3.05	6.94±7.19
C20:3n6	1.08±0.69	1.27±0.64	1.14±0.68	1.93±0.53	1.75±0.06	1.88±0.46	4.55±4.76	2.61±2.21	4.01±4.27
C20:3n3	3.17±1.71	3.77±1.55	3.34±1.67	6.29±2.10	5.39±0.83	6.04±1.87	16.54±16.09	7.44±5.26	14.01±14.46
C20:4n6	5.57±3.12	6.50±2.97	5.83±3.07	10.63±3.13	9.35±1.02	10.28±2.76	29.82±29.59	13.69±10.45	25.34±26.59
C20:5n3	8.86±4.86	11.24±4.76	9.52±4.89	21.04±24.76	18.50±8.59	20.33±21.41	21.35±27.64	41.97±45.10	27.08±34.00
C22:2n6	1.12±1.37	1.01±1.61	1.09±1.42	2.40±1.19	2.18±1.15	2.34±1.16	7.02±11.24	3.02±3.98	5.91±9.88
C22:6n3	26.48±12.84	32.61±12.38	28.18±12.84	46.06±64.40	43.11±24.99	45.24±55.90	36.19±47.71	82.41±85.98	49.03±62.99
PUFA	57.05±18.25	68.85±13.76	60.33±17.76	109.40±92.23	98.51±34.06	106.37±79.99	173.30±138.01	178.51±157.40	174.75±141.35
C15:0+C17:0	1.60±0.88	1.97±0.71	1.71±0.84	4.42±1.77	3.59±0.36	4.19±1.55	9.60±8.05	5.94±4.81	8.58±7.42
C20:1+C22:1	3.26±1.67	4.51±1.65	3.61±1.74	11.30±6.30	12.89±6.79	11.74±6.38	18.41±15.56	15.28±14.42	17.54±15.11
C20:5n3 / C22:6n3	0.35±0.16	0.36±0.13	0.35±0.15	0.59±0.20	0.47±0.11	0.55±0.19	0.62±0.20	0.46±0.15	0.58±0.20
n-3 PUFA	40.31±16.37	49.78±14.49	42.95±16.25	76.80±89.37	70.16±33.66	74.95±77.50	82.41±79.43	136.86±135.07	97.53±99.04
n-6 PUFA	15.28±9.02	17.36±6.83	15.85±8.42	29.55±7.37	25.62±2.07	28.46±6.57	82.75±83.90	37.85±31.49	70.28±75.49
TFA	89.12±28.89	111.70±23.94	95.39±29.14	416.40±322.22	443.36±178.00	423.89±287.16	369.39±285.84	380.50±359.57	372.48±302.71
注：SFA为饱和脂肪酸，MUFA为单不饱和脂肪酸，PUFA为多不饱和脂肪酸，TFA为总脂肪酸；±后为标准偏差。

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表 4 拉氏南美南极鱼体长与特征脂肪酸含量之间的关系

Tab. 4 The relationship between standard length and percentage of specific fatty acids in the different tissues of rock cod

脂肪酸	肌肉		肝脏		性腺
脂肪酸	R²	p	R²	p	R²	p
C14:0	0.020	0.412	0.000	0.976	0.000	0.915
C16:0	0.129	0.031^*	0.009	0.575	0.000	0.917
C15:0+C17:0	0.125	0.035^*	0.138	0.026^*	0.230	0.003^*
C16:1n7	0.032	0.295	0.010	0.554	0.001	0.848
C18:1n9	0.021	0.395	0.004	0.720	0.002	0.797
C18:2n6	0.095	0.067	0.235	0.003^*	0.251	0.002^*
C20:1+C22:1	0.232	0.003^*	0.019	0.417	0.152	0.019^*
C20:4n6	0.097	0.064	0.225	0.003^*	0.240	0.002^*
C20:5n3	0.016	0.462	0.001	0.856	0.025	0.362
C22:6n3	0.011	0.551	0.002	0.795	0.061	0.148
C20:5n3/ C20:5n3	0.010	0.553	0.089	0.078	0.326	0.000^*
n-6 PUFA/n-3 PUFA	0.004	0.706	0.034	0.280	0.252	0.002^*
注：*表示两者关系呈线性关系（p<0.05）。

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