Population size estimates and migrations of the queen conch (Aliger gigas) in the nursery ground of the Xel-Há coastal inlet based on a mark-recapture and census surveys

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science Pub Date : 2024-09-28 DOI:10.1016/j.rsma.2024.103845

Villegas-Hernández Harold , Monroy-López Juan Carlos , Pech-Puch Dawrin , Manzanero-Vázquez Eddie Alejandro , Raigoza-Figueras Rodolfo

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引用次数: 0

Abstract

This project aims to analyze the spatiotemporal variations of the queen conch (Aliger gigas) population in the sanctuary of Xel-Há Inlet (Mexico). During 2022 and 2023, visual censuses (on 42 fixed transects per sampling) and biometrics (siphonal length SL and lip thickness LT) were carried out to estimate average densities and size-frequency distribution within four zones: Bocana (BO), Centro (CN), Brazo Norte (BN), and Brazo Sur (BS). In addition, the average population size (

{\hat{N}}_{t}

) and migrations were estimated following a mark-recapture methodology on 7 occasions, tagging 574 specimens (279 in 2022 and 295 in 2023). Regarding the ontogenetic phases (based on LT) of the organisms observed during censuses in 2022 (n = 279), 81 corresponded to adults and 198 juveniles; meanwhile, in 2023 (n = 531), 36 were adults and 495 juveniles, indicating that the inlet is mostly a nursery ground. The overall mean densities have increased since Feb-2022 (0.543 ind./100 m²) up to Nov-2023 (5.079 ind./100 m²). Benthic variables and density of A. gigas varied spatially, i.e., CN and BO had higher benthic coverage of sand and seagrasses related to elevated densities of adults; meanwhile, BN and BS were dominated by turf and macroalgae and related to higher densities for juveniles. A total of 284 (54.2 % of tags) specimens were recaptured at another time, and based on the Jolly-Seber model,

{\hat{N}}_{t}

was estimated at 938 specimens (ranging from 538 to 1369). Regarding migrations, 79 tagged specimens that moved to other zones were identified, and 205 specimens were again observed in the same zone. Inter-annually, 108 tags in 2022 were later observed in 2023, and 36 specimens (earlier as juveniles) a year later were recaptured as adults; meanwhile, 72 adults in 2022 were again observed in 2023, thus indicating that queen conch used to return to breed within the inlet.

查看原文本刊更多论文

根据标记重捕和普查，估算谢尔哈沿海入海口育苗场中皇后海螺（Aliger gigas）的种群数量和迁移情况

本项目旨在分析墨西哥 Xel-Há Inlet 保护区内皇后海螺（Aliger gigas）种群的时空变化。在 2022 年和 2023 年期间，进行了目测普查（每次取样在 42 个固定横断面上进行）和生物测定（虹吸管长度 SL 和唇厚度 LT），以估计四个区域内的平均密度和大小频率分布：Bocana (BO)、Centro (CN)、Brazo Norte (BN) 和 Brazo Sur (BS)。此外，还采用标记重捕方法估算了平均种群数量（Nˆt）和迁徙情况，共进行了 7 次标记重捕，标记了 574 个标本（2022 年 279 个，2023 年 295 个）。关于 2022 年（n = 279）普查中观察到的生物的个体发育阶段（以 LT 为基础），81 个为成体，198 个为幼体；而 2023 年（n = 531），36 个为成体，495 个为幼体，这表明该水域主要是育苗场。总体平均密度自 2022 年 2 月（0.543 尾/100 平方米）至 2023 年 11 月（5.079 尾/100 平方米）有所上升。底栖变量和大口鲈密度在空间上存在差异，即 CN 和 BO 的底栖覆盖有较多的沙和海草，与成鲈密度升高有关；而 BN 和 BS 则以草皮和大型藻类为主，与幼鲈密度升高有关。共有 284 个标本（占标签总数的 54.2%）在其他时间被重新捕获，根据 Jolly-Seber 模型，Nˆt 估计为 938 个标本（从 538 个到 1369 个不等）。在洄游方面，79 个被标记的标本被确认洄游到其他区域，205 个标本在同一区域再次被观察到。在年度间，2022 年有 108 个标签标本在 2023 年被观察到，一年后有 36 个标本（早期为幼体）被重新捕获为成体；同时，2022 年有 72 个成体在 2023 年被再次观察到，这表明皇后螺经常返回海湾内繁殖。

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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来源期刊

Regional Studies in Marine Science Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

3.90

自引率

4.80%

发文量

336

审稿时长

69 days

期刊介绍： REGIONAL STUDIES IN MARINE SCIENCE will publish scientifically sound papers on regional aspects of maritime and marine resources in estuaries, coastal zones, continental shelf, the seas and oceans.