Environmental influences on the spatio‐temporal distribution of Coilia nasus in the Yangtze River estuary

Abstract

The Yangtze River estuary (YRE) is an important migration channel and foraging habitat for Coilia nasus. Due to its ecological significance and a prioritization of this species' protection, the need to investigate and analyze environmental relationships of the abundance of Coilia nasus in the YRE as well as develop an understanding of their temporal and spatial distributions is becoming exceedingly important. Using fishery data and environmental survey data from 2009 to 2016, three models including generalized additive mixed models (GAMM), generalized additive models with zeroinflated Poisson distribution (ZIP-GAM) and two-step GAM were used to analyze relationships between environmental factors and the distribution of Coilia nasus in the YRE. The results showed that model fitting of GAMM was more consistent with observations and revealed influences of water temperature, salinity, chlorophyll, and pH on distribution. GAMM demonstrated that higher Coilia nasus abundances were located in waters with water temperature values at 15°C and 30°C, and lower Coilia nasus abundances were located in areas with water temperature values at 10°C and 20°C. All models indicated that the effect of salinity on abundance of Coilia nasus present a multimodal pattern including three peaks at 5, 15, and 25 ppt respectively.Additionally, abundance of Coilia nasus increased with the increase of chlorophyll A in its range of 0-4 mg/L. In a range of 8.0-9.5, higher PH value was more suitable for the aggregation of Coilia nasus. Cross validation was used to evaluate the predictive performance of models and GAMM was found to be the best. The predicted abundance distribution of Coilia nasus in the summer and autumn of 2016 was relatively higher overall than that in winter and spring. The predicted zero abundance distribution pattern was consistent with the sampling presence distribution which was obtained using fishery independent survey data of the year 2009-2015. Facing the urgency protection of Coilia nasus in YRE, results of this study could be used for Coilia nasus conservation and reserve planning. K E Y W O R D S Coilia nasus, GAM, spatio-temporal distribution, the Yangtze River estuary, zero-inflated model How to cite this article: Ma J, Li B, Zhao J, Wang X, Hodgdon CT, Tian S. Environmental influences on the spatio-temporal distribution of Coilia nasus in the Yangtze River estuary. J Appl

Influence of Spatial Scale Selection of Environmental Factors on the Prediction of Distribution of Coilia nasus in Changjiang River Estuary

“…Our results also showed that the C. nasus had a tendency of spreading from offshore to inland in spring when the temperature rose, indicating that the C. nasus had entered the process of reproductive migration. Previous studies on C. nasus found that pH also affected its distribution, and weakly alkaline water (8.5-9.5) was more suitable for the survival of C. nasus [46]. At the same time, the increase of chlorophyll in a certain range (5-15 μg•L −1 ) also increased the abundance of C. nasus [47].…”

Ascaridoid Nematodes Infection in Anadromous Fish Coilia nasus from Yangtze River

“…Adult C. nasus has been reported to migrate upstream from early February to the end of April, and spawn in the middle and lower reaches of the Yangtze River and connected lakes [14,17,18]. Unfortunately, in recent decades, stocks of C. nasus in the Yangtze River have experienced a significant decline due to anthropogenic influences such as excessive fishing activities, extensive hydraulic construction obstructing migration routes, and degradation of their natural habitats [19][20][21]. Recently, parasite infection in Coilia spp.…”

Combining genome-wide association study and transcriptome analysis to identify molecular markers and genetic basis of population-asynchronous ovarian development in <i>Coilia nasus</i>

“…Current research on C. nasus has primarily focused on natural resource distribution ( Ma et al, 2020 ), migratory behavior ( Yin et al, 2020 ), genetic diversity ( Zhang et al, 2023 ), and stress regulation ( Du et al, 2014 ; Gao et al, 2021 ), with limited studies investigating population-asynchronous ovarian development ( Xu et al, 2016 ). The development of high-throughput sequencing has significantly contributed to the advancement of genetic breeding in aquatic animals.…”