Study on habitat suitability of Coilia mystus in Pearl River Estuary, China
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摘要: 探究珠江河口洄游性鱼类凤鲚 (Coilia mystus) 的生境适宜度,可为其渔业资源保护和利用提供科学依据。根据2019年冬季和2020年夏季在珠江河口进行的底拖网调查数据,选取水深、底层盐度、底层水温、底层溶解氧等作为指示因子,利用层次分析法 (Analytic hierarchy process, AHP) 计算各指示因子的权重,采用算数平均法 (Arithmetic Mean Model, AMM) 和几何平均法 (Geometric Mean Model, GMM) 计算栖息地适宜度指数 (Habitat Suitability Index, HSI),验证发现基于GMM且赋予权重的HSI模型精确度较高,能较好地反映珠江河口凤鲚的栖息地分布。最优模型结果显示,珠江河口冬季和夏季凤鲚适宜的底层盐度分别为21.03‰~30.55‰和20.25‰~25.82‰,溶解氧质量浓度分别为6.79~7.28和3.85~4.01 mg·L−1,水深分别为11.69~20.10和7.80~9.23 m,底层水温分别为19.84~19.95和28.36~29.44 ℃。珠江河口凤鲚HSI大于0.5的站点仅占总调查站点的17.39%,表明其栖息地适宜性较低,目前珠江河口适宜凤鲚的栖息地主要位于内伶仃海域的中华白海豚自然保护区。Abstract: Exploring the habitat suitability of Coilia mystus, a migratory fish in the Pearl River estuary, can provide a scientific basis for the protection and utilization of fishery resources of C. mystus. Based on the date collected by the bottom-trawl in the Pearl River Estuary during winter in 2019 and summer in 2020, we constructed the habitat suitability index (HSI) model of C. mystus, taking the water depth, bottom salinity, bottom temperature, as well as bottom dissolved oxygen as indicator environment indicators. The analytic hierarchy process (AHP) was used to calculate the weight of the indicators. The arithmetic mean (AMM) and the geometric mean (GMM) were used to build a model. Then a suitability curve was developed and the HSI of C. mystus was calculated. Results show that the optimal bottom salinities for C. mystus in the Pearl River Estuary in winter and summer were 21.03‰−30.55‰ and 20.25‰−25.82‰, respectively; the mass concentrations of suitable dissolved oxygen were 6.79–7.28 and 3.85–4.01 mg·L−1, respectively; the suitable water depths were 11.69–20.10 and 7.80–9.23 m, respectively; the suitable bottom temperatures were 19.84–19.95 and 28.36–29.44 ℃, respectively. The sites with HSI value greater than 0.5 accounted for 17.39% of the total survey sites. The study shows that the suitability of C. mystus was low, and its suitable habitats in the Pearl River Estuary are mainly located in the Sousa chinensis Nature Reserve in the Neilingding sea area.
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Key words:
- Coilia mystus /
- Habitat suitability index /
- Environment factors /
- Pearl River Estuary
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表 1 指示因子的判断矩阵
Table 1. Judgment matrix of indicator factors
指示因子
Indicator factor底层盐度
Bottom
salinity底层溶解氧
Bottom
DO水深
Water
depth底层水温
Bottom temperature底层盐度
Bottom salinity1 3 5 5 底层溶解氧
Bottom DO0.33 1 3 4 水深
Water depth0.20 0.33 1 2 底层水温
Bottom temperature0.20 0.25 0.5 1 -
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