Notes on the Occurrence of Northern Snakehead in a Mid-Atlantic Lake System: 16 Years of Monitoring

IF 0.5 4区环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Northeastern Naturalist Pub Date : 2023-11-30 DOI:10.1656/045.030.0406

Colin R. Rohrback, David H. Keller, Paul F. Overbeck, Daniel P. Morrill

引用次数: 0

Abstract

Abstract - Channa argus (Northern Snakehead) was first discovered in Pennsylvania and the Delaware River watershed in 2004 in Franklin Delano Roosevelt Park (FDRP), Philadelphia, PA. We monitored this population by boat and/or backpack electrofishing from 2005 to 2021. Our objective was to summarize common population characteristics and compare these with other non-native Northern Snakehead populations. Length-at-age data indicated the FDRP population was slower growing and lacked larger individuals relative to other populations. Data from stomach dissection documented feeding on Anguilla rostrata (American Eel), Lepomis macrochirus (Bluegill), Lepomis gibbosus (Pumpkinseed), Fundulus diaphanus (Banded Killifish), and Micropterus salmoides (Largemouth Bass), suggesting potential impacts to these species. Backpack electrofishing in 2005 and 2008 showed significant decreases in the densities of American Eel and Banded Killifish which may be due to predation by Northern Snakehead.

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关于大西洋中部湖泊系统中出现北方蛇头鱼的说明：16 年的监测结果

摘要-2004 年，我们在宾夕法尼亚州费城的富兰克林-德拉诺-罗斯福公园（FDRP）首次发现了北蛇头鱼（Channa argus）。从 2005 年到 2021 年，我们通过乘船和/或背负式电鱼对该种群进行了监测。我们的目标是总结种群的共同特征，并将这些特征与其他非本地北方蛇头鱼种群进行比较。年龄长度数据表明，与其他种群相比，FDRP 种群的生长速度较慢，缺乏较大的个体。胃部解剖数据记录了以 Anguilla rostrata（美洲鳗鱼）、Lepomis macrochirus（蓝鳃鱼）、Lepomis gibbosus（南瓜籽鱼）、Fundulus diaphanus（带鱼）和 Micropterus salmoides（大口鲈鱼）为食的情况，表明这些物种可能受到影响。2005 年和 2008 年的背负式电鱼法显示，美洲鳗鱼和带鱼的密度显著下降，这可能是由于北方蛇头鱼的捕食造成的。

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

Northeastern Naturalist 环境科学-生态学

CiteScore

1.10

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： The Northeastern Naturalist covers all aspects of the natural history sciences of terrestrial, freshwater, and marine organisms and the environments of the northeastern portion of North America, roughly bounded from Virginia to Missouri, north to Minnesota and Nunavut, east to Newfoundland, and south back to Virginia. Manuscripts based on field studies outside of this region that provide information on species within this region may be considered at the Editor’s discretion. The journal welcomes manuscripts based on observations and research focused on the biology of terrestrial, freshwater, and marine organisms and communities as it relates to their life histories and their function within, use of, and adaptation to the environment and the habitats in which they are found, as well as on the ecology and conservation of species and habitats. Such studies may encompass measurements, surveys, and/or experiments in the field, under lab conditions, or utilizing museum and herbarium specimens. Subject areas include, but are not limited to, anatomy, behavior, biogeography, biology, conservation, evolution, ecology, genetics, parasitology, physiology, population biology, and taxonomy. Strict lab, modeling, and simulation studies on natural history aspects of the region, without any field component, will be considered for publication as long as the research has direct and clear significance to field naturalists and the manuscript discusses these implications.