Emigration of hatchery‐reared Pallid Sturgeon,Scaphirhynchus albus (Forbes and Richardson), through a Missouri River dam     

Landon L. Pierce  Dane A. Shuman  Daniel A. James  Kirk D. Steffensen  Ryan Wilson  Kyle Winders  Adam McDaniel 《Fisheries Management and Ecology》2019,26(3):295-305

The middle Missouri River (MMR; Fort Randall Dam, SD to Gavins Point Dam, NE‐SD) is stocked with hatchery‐reared pallid sturgeon, Scaphirhynchus albus (Forbes and Richardson), from upper Missouri River broodstock to aid recovery of this federally endangered species. Emigration of these fish through Gavins Point Dam restores genetic connectivity that likely existed pre‐impoundment but could lead to outbreeding depression in the future. Recapture data of hatchery‐reared pallid sturgeon stocked in the MMR were evaluated to improve understanding of pallid sturgeon emigration. From 2004 to 2015, 219 emigrants were caught: 4 stocked at age ≥2 years and 215 stocked at age ≤1 year. Emigration of the 2001‐2007 year classes stocked at age 1 was a consistent phenomenon and appeared higher than emigration of year classes stocked at ages 2–3. Little evidence suggested emigration was associated with an unusually high‐water event in 2011. The annual emigration probability of individuals stocked at age 1 estimated from multi‐state mark–recapture models was 0.05 [95% confidence interval = 0.04–0.06] for fish ages ≥1 year. This study suggests that alterations to stocking practices (e.g. stocking age) may affect emigration rates and, therefore, connectivity among pallid sturgeon populations.  相似文献   

The role of floods and droughts on riverine ecosystems under a changing climate     

Piotr Parasiewicz  Elise L. King  J. Angus Webb  Miko&#x;aj Piniewski  Claudio Comoglio  Christian Wolter  Anthonie D. Buijse  David Bjerklie  Paolo Vezza  Andreas Melcher  Katarzyna Suska 《Fisheries Management and Ecology》2019,26(6):461-473

Floods and droughts are key driving forces shaping aquatic ecosystems. Climate change may alter key attributes of these events and consequently health and distribution of aquatic species. Improved knowledge of biological responses to different types of floods and droughts in rivers should allow the better prediction of the ecological consequences of climate change‐induced flow alterations. This review highlights that in unmodified ecosystems, the intensity and direction of biological impacts of floods and droughts vary, but the overall consequence is an increase in biological diversity and ecosystem health. To predict the impact of climate change, metrics that allow the quantitative linking of physical disturbance attributes to the directions and intensities of biological impacts are needed. The link between habitat change and the character of biological response is provided by the frequency of occurrence of the river wave characteristic—that is the event's predictability. The severity of impacts of floods is largely related to the river wave amplitude (flood magnitude), while the impact of droughts is related to river wavelength (drought duration).  相似文献   

Tributaries as biodiversity preserves: An ichthyoplankton perspective from the severely impounded Upper Paraná River     

Patricia Sarai da Silva  Leandro Esteban Miranda  Sergio Makrakis  Lucileine de Assumpo  Joo Henrique Pinheiro Dias  Maristela Cavicchioli Makrakis 《水产资源保护:海洋与淡水生态系统》2019,29(2):258-269

Dispersal and mortality of translocated thick‐shelled river mussel Unio crassus Philipsson, 1788 adults revealed by radio tracking     

Katarzyna Zaj&#x;c  Tadeusz A. Zaj&#x;c  Pawe&#x; Adamski  Wojciech Biela&#x;ski  Adam M. &#x;miel  Anna M. Lipi&#x;ska 《水产资源保护:海洋与淡水生态系统》2019,29(3):331-340

Structural microhabitat use by endemic cyprinids in a Mediterranean‐type river: Implications for restoration practices          下载免费PDF全文

《水产资源保护:海洋与淡水生态系统》2018,28(1):26-36

基于河流生态系统健康的生态修复技术研究进展   总被引：1，自引：0，他引：1  

刘欢  杨少荣  王小明 《水生态学杂志》2019,40(2):1-6

随着人类对河流大规模开发利用,河流生态系统遭受严重破坏。近年来,生态修复引起了社会广泛关注,也取得了显著的进步。本文从河流生态系统特性和所受胁迫出发,介绍了河流健康概念和评价方法,回顾了国内外河流生态修复相关研究发展历程,归纳了河流生态修复的理念,并以河流健康因素为基础,总结了水量、连通性、水质、水生生物4个方面的生态修复技术及其实践案例,最后根据当前研究的不足,提出了河流生态修复的3个研究方向,以期为未来的修复实践提供参考和指导。  相似文献   

Combining eight research areas to foster the uptake of ecosystem‐based management in fresh waters     

Simone D. Langhans  Sami Domisch  Stefano Balbi  Gonzalo Delacmara  Virgilio Hermoso  Mathias Kuemmerlen  Romina Martin  Javier Martínez‐Lpez  Peter Vermeiren  Ferdinando Villa  Sonja C. Jhnig 《水产资源保护:海洋与淡水生态系统》2019,29(7):1161-1173

汉沽管理区农田水利发展状况     

王翠芬  刘晓萍 《北方水稻》2005,(5):47-49

揭示出汉沽管理区地理位置和自然旱灾引起的海水倒灌、地上水盐分超标,以及地下水开采超量等原因所造成的水少、水暴、水脏三大问题,启示人们应从全局和战略高度提高认识,加强农田水利基本建设。并总结了近年来管理区农田水利发展的经验,提出了今后的发展规划。  相似文献   

Infection by Anguillicoloides crassus in a riverine stock of European eel,Anguilla anguilla     

S. COSTA‐DIAS  E. DIAS  J. LOBÓN‐CERVIÁ  C. ANTUNES  J. COIMBRA 《Fisheries Management and Ecology》2010,17(6):485-492

Abstract Infection by the parasitic nematode Anguillicoloides crassus Kuwahara, Niimi & Itagaki, in a wild riverine stock of European eel, Anguilla anguilla (L.), in a near pristine river was investigated. Samples were collected on a seasonal basis in distinct habitats along the river gradient. This study highlighted the presence of the parasite and completion of the whole life cycle in eels from the Río Esva. Infection levels by A. crassus were high at three sites between the mid river to the estuary and also varied among seasons. Condition of eels was lower at upstream sites compared with downstream locations. Although high‐quality, environmental conditions in the Río Esva may buffer the effects of A. crassus on eels, potential impacts and limiting factors for the parasite are discussed.  相似文献   

Delayed smolt migration of stocked Atlantic salmon parr     

O. T. SKILBREI  V. WENNEVIK  G. DAHLE  B. BARLAUP  T. WIERS 《Fisheries Management and Ecology》2010,17(6):493-500

Abstract The timing of the smolt run in the Dale River in western Norway was monitored from 2002 to 2007 after annual stocking in late autumn 2000 to 2005 with 5000–10800, 11–16 g, Atlantic salmon, Salmo salar L., parr. The releases yielded an annual smolt production of 1000–2000 individuals, mainly 1+ smolts. Almost 5700 stocked smolts were trapped during smolt migration and 60% of these were genotyped for family identification. The date for 50% descent varied by 14 days from year to year. For the most part, however, the 2+ stocked smolts and the majority of the wild smolts left the river in May, while the 1+ stocked smolts migrated 23–26 days later in June. It was concluded that the strategy of stocking large parr in late autumn may conflict with the natural timing of smolt migration the following spring.  相似文献