Nest Site Selection Along Forest-Streams by Two Forest-Dwelling Neotropical Passerines

IF 0.8 4区 生物学 Q3 ORNITHOLOGY Acta Ornithologica Pub Date : 2021-03-19 DOI:10.3161/00016454AO2020.55.2.005
D. F. Perrella, P. Zima, M. Francisco
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引用次数: 2

Abstract

Abstract. In tropical forests many forest-dwelling non-aquatic passerines build nests by forest streams. It has been proposed that this behavior protects the nest from predators. However, this hypothesis has been rarely tested, and relevant aspects of the relationships between nesting birds and forest streams are to be studied. Firstly, it is not clear whether tropical forest understory passerines can indeed select stream banks for nest construction, as researchers often use forest streams as pathways, which could cause the false impression that nests of certain species are more frequently found near water. Secondly, it is expected that if birds select stream banks for nest construction, they will choose nest spots with characteristics that could increase nest survival. We studied nest site selection in two Atlantic Forest birds: the Blue Manakin Chiroxiphia caudata and the Star-throated Antwren Rhopias gularis. Nests were searched near and far from water, and a number of stream characteristics, including width, depth, water speed and water sound were compared between nest sites and random sites chosen upstream or downstream. Finally, we addressed whether stream variables could explain nest daily survival rate (DSR). Nests of both species were found only near or over water, and the average DSR was 0.975 for the Blue Manakin and 0.972 for the Star-throated Antwren. Our results provided support for the "aqua-phobic nest predator hypothesis", since we found a positive correlation between DSR and stream depth for the Star-throated Antwren and a negative correlation between nest distance from water and DSR for the Blue Manakin. However, stream parameters were not among the main variables explaining nest site selection along streams. This suggests that partial isolation provided by forest streams may reduce nest predation and can drive these species to use stream banks for nesting. The main predators of Blue Manakin nests were birds (80% of filmed predation events), whereas nests of Star-throated Antwren were preyed upon mostly by mammals (54.5% of the records).
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两种生活在森林中的新热带雀形目动物在森林溪流中的巢址选择
摘要在热带森林中,许多栖息在森林中的非水生雀形目动物在森林溪流旁筑巢。有人提出,这种行为可以保护巢穴免受捕食者的侵害。然而,这一假设很少得到验证,筑巢鸟类和森林溪流之间关系的相关方面有待研究。首先,尚不清楚热带森林林下的雀形目雀形目是否真的可以选择河岸筑巢,因为研究人员经常将森林溪流作为路径,这可能会造成某些物种的巢穴更经常在水附近发现的错误印象。其次,预计鸟类在选择河岸筑巢时,会选择具有提高筑巢成活率特征的筑巢点。本文研究了两种大西洋森林鸟类的巢址选择:蓝金丝鸟Chiroxiphia caudata和星喉蚁Rhopias gularis。研究人员在靠近水和远离水的地方搜索了鸟巢,并比较了鸟巢地点和随机选择的上游或下游地点之间的许多溪流特征,包括宽度、深度、水流速度和水声。最后,我们讨论了流变量是否可以解释巢的日存活率(DSR)。两种鸟的巢均分布在水面附近,平均DSR分别为0.975和0.972。我们的研究结果为“恐水巢捕食者假说”提供了支持,因为我们发现星喉蚁的DSR与溪流深度呈正相关,而蓝喉蚁的巢距与水的DSR呈负相关。然而,溪流参数并不是解释沿溪流筑巢地点选择的主要变量。这表明森林溪流提供的部分隔离可能会减少巢穴捕食,并可以驱使这些物种使用河岸筑巢。蓝喉蚁巢的主要捕食者是鸟类(80%的记录捕食事件),而星喉蚁巢主要被哺乳动物捕食(54.5%的记录)。
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来源期刊
Acta Ornithologica
Acta Ornithologica 生物-鸟类学
CiteScore
2.10
自引率
0.00%
发文量
14
审稿时长
>12 weeks
期刊介绍: Publishes scientific papers (original research reports, reviews, short notes, etc.) and announcements from all fields of ornithology. All manuscripts are peer-reviewed. Established in 1933 as Acta Ornithologica Musei Zoologici Polonici, since 1953 continued under the present title. Published twice a year by the Natura Optima Dux Foundation under the auspices of the Museum and Institute of Zoology, Polish Academy of Sciences.
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