Assessment of Habitat Suitability for Amphioxus in the Changli Marine Reserve and Adjacent Coastal Waters, Hebei Province.

The results indicated that amphioxus abundance exhibited a highly significant correlation ( p < 0.01) with 18 environmental factors, encompassing sediment organic carbon, sulfides, petroleum hydrocarbons, different particle size fractions (1~0.5 mm, 0.5~0.25 mm, 1~0.25 mm, 0.125~0.063 mm and <0.001 mm), sand content, silt content, clay content, as well as water quality parameters such as water depth, chemical oxygen demand (COD), nitrite, nitrate, inorganic nitrogen, chlorophyll-a and transparency ( Table 1 ).

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However, an overall trend of fluctuating decline was observed, especially with a larger decrease in 2015.

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