九叔归来3魁蛊婴在线观看_男人躁女人到高潮AV_香港成人论坛_亚洲精品久久久久久偷窥_夜来香成人网_亚洲制服 视频在线观看_无毒黄站_国产传媒18精品A片一区_麻花豆传媒剧国产MV在线观看_东北60岁熟女露脸在线_国产高清视频在线观看97_一道本视频一二三区_yellow免费播放在线观看_浪漫樱花动漫在线观看官网_高清AV熟女一区_天堂在线www_亚洲第一成年人网站_黄色在线免费观看_av女优快播_久久精品99国产精品日本

English | 中文版 | 手機(jī)版 企業(yè)登錄 | 個(gè)人登錄 | 郵件訂閱
當(dāng)前位置 > 首頁(yè) > 技術(shù)文章 > 通過(guò)浮游動(dòng)物和魚(yú)類剖面儀(AZFP)來(lái)了解藍(lán)鯨的亞中尺度空間分布

通過(guò)浮游動(dòng)物和魚(yú)類剖面儀(AZFP)來(lái)了解藍(lán)鯨的亞中尺度空間分布

瀏覽次數(shù):1016 發(fā)布日期:2024-8-21  來(lái)源:本站 僅供參考,謝絕轉(zhuǎn)載,否則責(zé)任自負(fù)

Understanding the oceanographic dynamics of the Isla Chañaral baleen whale feeding ground, (Humboldt Archipelago, Northern Chile) to extend habitat protection.

Off Northern Chile, baleen whales use the area around Isla Chañaral as a feeding ground where they forage on euphausiids. Isla Chañaral is part of the highly productive Humboldt Archipelago (∼ 28°S-29°S) within the Humboldt

Current System (HCS). In this study, we seek to understand the sub-

mesoscale spatial distribution of fin and blue whales and their prey around Isla Chañaral using systematic and opportunistic visual sighting data of whales and systematic acoustic backscatter data of zooplankton from an Acoustic Zooplankton and Fish Profiler (AZFP); and to examine the oceanographic dynamics of the wider Humboldt Archipelago area with remote-sensing oceanographic data. We completed a total of 512.6 km of survey effort over 20 days in 2018 and 318.3 km over 16 days in 2019 collecting systematic whale sighting and backscatter data. A total of 42 fin whales, 0 blue whales and 66 unidentified whales were sighted in 2018, and 7 fin whales, 3 blue whales and 12 unidentified whales were sighted in 2019. Observed spatial distribution of backscatter and whales was strongly associated with a bathymetric feature, i.e., the submarine canyon that curves around Isla Chañaral. Generalized Additive Models showed that fin whale presence was associated with high levels of backscatter and shallow depths similar to those of the canyon. We found that long-term average

geostrophic currents form a recirculation system between 28°S and 31°S that can transport nutrient-rich upwelled surface waters back towards the Humboldt Archipelago and contribute to high biological productivity in this area. However, in summer 2019 geostrophic flow occurred away from the coast and a warm low-productivity spring explained low backscatter and whale sightings around Isla Chañaral. The unique oceanographic features of Isla Chañaral and the Humboldt Archipelago that contribute to high concentrations of Endangered baleen whales and their prey justify the extension of the Isla Chañaral Marine Reserve to include the canyon between the mainland and the island, and the implementation of a Multiple Use Marine Protected Area for the entire Humboldt Archipelago area that explicitly protects this critical feature.
Remote-sensing oceanographic data were obtained to interpret any possible interannual differences in whale sightings (systematic and opportunistic) and to examine the oceanographic dynamics of the wider Humboldt Archipelago area. Thus, satellite sea surface temperature (SST) and chlorophyll-a (Chla) were obtained from the MUR (Global, 0.01 degrees) product and Aqua MODIS (Global.
To estimate the differences in current flow in the study area, mean geostrophic currents (from AVISO-CNES) were calculated for January and February 2018 and 2019. Moreover, mean currents obtained from a moored Acoustic Doppler Current Profiler (ADCP: RDI-Teledyne, Workhorse Sentinel, 300 kHz Model) deployed between Isla Chañaral and the mainland at 100 m depth, were also included in this analysis (Ramos, Unpublished). In this case, the mean corresponds to the depth average of the velocity vector for the same periods considered in obtaining the mean geostrophic currents. Additionally, to determine possible recirculation current systems off central-northern Chile, long-term averages (1993-2020) of geostrophic currents (from AVISO-CNES) in a meridional band between 20° and 40°S were calculated.

發(fā)布者:上海逐海儀器設(shè)備有限公司
聯(lián)系電話:13524341448
E-mail:service@generule.com

用戶名: 密碼: 匿名 快速注冊(cè) 忘記密碼
評(píng)論只代表網(wǎng)友觀點(diǎn),不代表本站觀點(diǎn)。 請(qǐng)輸入驗(yàn)證碼: 8795
Copyright(C) 1998-2025 生物器材網(wǎng) 電話:021-64166852;13621656896 E-mail:info@bio-equip.com
主站蜘蛛池模板: 济源市| 茶陵县| 沐川县| 定边县| 仁布县| 宁南县| 会同县| 南安市| 玉田县| 陆川县| 诸城市| 焉耆| 东兰县| 诸暨市| 荃湾区| 竹溪县| 友谊县| 兰州市| 黎川县| 黄陵县| 泰顺县| 安多县| 镇江市| 广汉市| 乐亭县| 沅江市| 延庆县| 余干县| 壤塘县| 武安市| 泰州市| 天等县| 紫云| 南京市| 鄄城县| 仁怀市| 微博| 当涂县| 临沭县| 白玉县| 舟曲县|