Ecological Niche and Spatial Distribution Models of the Russian Sturgeon Acipenser gueldenstaedtii Brandt et Ratzeburg (1833) in the Northern Part of the Caspian Sea Based on Long-Term Monitoring Data (1992–2011) in the Summer Period

Pub Date : 2024-06-13 DOI:10.1134/s2075111724700097

G. I. Ruban, I. V. Konopleva, F. A. Osipov, N. N. Dergunova, X. Zhang, V. G. Petrosyan

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Abstract

The ecological niches (ENM) and spatial distribution (SDM) models of the Russian sturgeon Acipenser gueldenstaedtii Brandt et Ratzeburg (1833), as well as zoobenthos—the main components of this species feeding (Annelida, Mollusca and Crustacea) in the northern part of the Caspian Sea based on long-term monitoring data (1992–2011) and raster layers of the marine environment are presented. The constructed ENM using PCA within the framework of two concepts COUE and ECOUE allowed us to test the hypothesis of conservatism of ecological niches of the Russian sturgeon over time. It was shown that, while under the COUE concept the hypothesis of niche conservatism was fulfilled for one time period of monitoring, under the expanded ECOUE concept, this hypothesis is fulfilled for all monitoring periods. The SDM built by MaxEnt showed that trophic relationships between Russian sturgeon and Azov-Black Sea invaders from different taxonomic groups (Annelida, Mollusca, and Crustacea) in the northern part of the Caspian Sea are quite closely reflected in their spatial distribution. High biomass values of molluscs, crustaceans and ringworms (Annelida) as the main component in the feeding of Russian sturgeon in the western part of the Northern Caspian Sea create preferred conditions for feeding of Russian sturgeon in summer. It has been established that, in the eastern and shallow parts of the Northern Caspian the main components of the feeding are mollusks and crustaceans.

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基于夏季长期监测数据（1992-2011 年）的里海北部俄罗斯鲟 Acipenser gueldenstaedtii Brandt et Ratzeburg (1833) 的生态位和空间分布模型

摘要基于里海北部的长期监测数据（1992-2011 年）和海洋环境栅格图层，介绍了俄罗斯鲟鱼 Acipenser gueldenstaedtii Brandt et Ratzeburg（1833 年）的生态位（ENM）和空间分布（SDM）模型，以及底栖动物--该物种摄食的主要组成部分（环节动物、软体动物和甲壳动物）。在 COUE 和 ECOUE 两个概念的框架内使用 PCA 构建的 ENM 使我们能够检验俄罗斯鲟鱼生态位随时间变化的保守性假设。结果表明，在 COUE 概念下，生态位保守性假设在一个监测时段内得到了验证，而在扩展的 ECOUE 概念下，该假设在所有监测时段内都得到了验证。由 MaxEnt 建立的 SDM 显示，俄罗斯鲟鱼与里海北部不同分类群（无脊椎动物、软体动物和甲壳动物）的亚速海-黑海入侵者之间的营养关系在其空间分布中得到了相当密切的反映。俄罗斯鲟鱼在北里海西部摄食的主要成分--软体动物、甲壳动物和环节动物（环节动物）的高生物量值，为俄罗斯鲟鱼夏季摄食创造了有利条件。已经确定，在北里海东部和浅海地区，摄食的主要成分是软体动物和甲壳类动物。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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