Short-term riparian restoration success measured by territory density and reproductive success of three songbirds along the Trinity River, California

IF 2.6 2区 生物学 Q1 ORNITHOLOGY
Condor Pub Date : 2019-10-03 DOI:10.1093/condor/duz043
Jaime L. Stephens, Sarah M. Rockwell
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引用次数: 4

Abstract

ABSTRACT Water crises and endangered salmon are pressing environmental concerns influencing restoration decisions in the western United States. When instream restoration necessitates initial loss of riparian cover to restore floodplain function, a short-term goal to minimize harm to riparian-associated wildlife is a worthwhile benchmark. From 2012 to 2015, we examined short-term restoration success, as measured by territory characteristics and reproductive success in restored and reference sites, for 3 riparian bird species (Song Sparrow [Melospiza melodia], Yellow-breasted Chat [Icteria virens], and Yellow Warbler [Setophaga petechia]) along a 64 km stretch of the Trinity River, California. Territory size had the highest relative variable importance in sets of candidate models explaining territory density for all 3 species, and was inversely related to territory density for each. The effect of site type (i.e. restored vs. reference) in explaining territory density was least for Song Sparrow, greater for Yellow Warbler (for which density was 1.4 times greater on reference sites), and greatest for Yellow-breasted Chat (which were more than twice as dense on reference sites). While territory density and mean territory size were inversely related, we found no relationship between territory density or site type and mean productivity per nest, and nest success did not differ between restored and reference sites for any species. In combination, these results suggest that restoration has achieved short-term success as measured by reproductive success, but has not yet been fully successful in supporting similar territory densities as reference sites. In order to determine whether long-term restoration goals are fully achieved, future research should continue to measure density of the 3 focal species as vegetation on the replanted floodplains matures.
加利福尼亚州三一河沿岸三只鸣禽的领地密度和繁殖成功率衡量的短期河岸恢复成功率
水危机和濒临灭绝的鲑鱼是影响美国西部恢复决策的紧迫环境问题。当河流恢复需要最初丧失河岸覆盖以恢复洪泛平原功能时,将对河岸相关野生动物的伤害最小化的短期目标是一个值得参考的基准。从2012年到2015年,我们研究了加州圣特里尼河沿岸64公里长的3种滨水鸟类(宋雀、黄胸雀和黄莺)的短期恢复成功情况,通过测量恢复地点和参考地点的领土特征和繁殖成功率来衡量。在解释所有3种物种的领土密度的候选模型集中,领土大小具有最高的相对变量重要性,并且与每种物种的领土密度呈负相关。在解释领地密度方面,地点类型(即恢复与参考)对宋雀的影响最小,对黄莺的影响最大(黄莺的密度是参考地点的1.4倍),对黄胸甲的影响最大(其密度是参考地点的两倍以上)。虽然领地密度与平均领地面积呈负相关,但我们发现领地密度或立地类型与平均窝生产力之间没有关系,并且任何物种的筑巢成功率在恢复点和参考点之间没有差异。综上所述,这些结果表明,以繁殖成功率衡量,恢复取得了短期的成功,但在支持类似的领土密度作为参考地点方面还没有完全成功。为了确定长期恢复目标是否完全实现,未来的研究应继续测量3种焦点物种的密度,随着植被在重新种植的洪泛平原上的成熟。
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来源期刊
Condor
Condor ORNITHOLOGY-
CiteScore
6.30
自引率
12.50%
发文量
46
审稿时长
6-12 weeks
期刊介绍: The Condor is the official publication of the Cooper Ornithological Society, a non-profit organization of over 2,000 professional and amateur ornithologists and one of the largest ornithological societies in the world. A quarterly international journal that publishes original research from all fields of avian biology, The Condor has been a highly respected forum in ornithology for more than 100 years. The journal is one of the top ranked ornithology publications. Types of paper published include feature articles (longer manuscripts) Short Communications (generally shorter papers or papers that deal with one primary finding), Commentaries (brief papers that comment on articles published previously in The Condor), and Book Reviews.
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