Intra- and inter-annual variation in body mass of two species of weavers in an Afrotropical environment

IF 0.7 4区生物学 Q3 ORNITHOLOGY

Bird Study Pub Date : 2022-10-02 DOI:10.1080/00063657.2022.2151561

Akpanta J. Ishong, T. Omotoriogun

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引用次数: 0

Abstract

ABSTRACT Capsule We describe the effects of sex, daily rainfall and temperature, seasonality, and breeding stage on body mass variation in two species of weaver in a tropical African environment. Aims To investigate the effects of sex, weather conditions, seasonality, and breeding stage on body mass of the Village Weaver Ploceus cucullatus and Northern Red Bishop Euplectes franciscanus in Amurum Forest Reserve, Central Nigeria. Methods Biometric data were extracted from a Constant Effort Sites database of over 15 years and daily rainfall and temperature data were obtained from Jos Metrological Center. We used a general linear mixed model to determine the effects of sex, rainfall, temperature, and season on body mass variation of the two species within and across years, and differences in body mass of females of the two species within and across years with daily rainfall and temperature, and season during the different incubation stages. Results The body mass of males was higher than that of females in both species. Daily rainfall and mean temperature were negatively related to body mass in Village Weavers, while in Northern Red Bishops rainfall was positively related to body mass. In both species, female body mass varied according to brood patch status: female Village Weavers were heavier during the egg-laying stage compared to the non-breeding season; female Northern Red Bishops weighed more at incubation or brooding stages and less during the chick rearing stage when compared to the non-breeding season. The body mass of females did not correlate with daily rainfall and temperature, or season. Conclusions Our results showed the effect of sex on body mass in both species of weaver. The variation in body mass of these species during breeding, and with local weather conditions, suggests how the species manage body mass within a tropical African environment.

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非洲热带环境中两种织布动物体重的年际和年际变化

摘要胶囊我们描述了在非洲热带环境中，性别、日降雨量和温度、季节性和繁殖阶段对两种织布工体重变化的影响。目的研究性别、天气条件、季节性和繁殖阶段对尼日利亚中部阿姆鲁姆森林保护区乡村织女Ploceus cuculatus和北方红主教Euplectes francicanus体重的影响。方法从超过15年的恒定努力位点数据库中提取生物特征数据，并从Jos Metrological Center获得日降雨量和温度数据。我们使用了一个通用的线性混合模型来确定性别、降雨量、温度和季节对两个物种年内和跨年体重变化的影响，以及两个物种雌性在不同孵化阶段的年内和跨年体重随日降雨量和温度以及季节的差异。结果两种动物的雄性体重均高于雌性。乡村编织者的日降雨量和平均温度与体重呈负相关，而北方红主教的降雨量与体重呈正相关。在这两个物种中，雌性体重因繁殖地状态而异：与非繁殖季节相比，雌性乡村编织者在产卵阶段更重；与非繁殖季节相比，雌性北方红主教在孵化或育婴阶段的体重更重，而在小鸡饲养阶段的体重更低。雌性的体重与日降雨量、温度或季节无关。结论我们的研究结果显示了性别对两种织布工体重的影响。这些物种在繁殖过程中身体质量的变化，以及当地的天气条件，表明了该物种如何在热带非洲环境中管理身体质量。

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来源期刊

Bird Study 生物-鸟类学

CiteScore

1.60

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Bird Study publishes high quality papers relevant to the sphere of interest of the British Trust for Ornithology: broadly defined as field ornithology; especially when related to evidence-based bird conservation. Papers are especially welcome on: patterns of distribution and abundance, movements, habitat preferences, developing field census methods, ringing and other techniques for marking and tracking birds. Bird Study concentrates on birds that occur in the Western Palearctic. This includes research on their biology outside of the Western Palearctic, for example on wintering grounds in Africa. Bird Study also welcomes papers from any part of the world if they are of general interest to the broad areas of investigation outlined above. Bird Study publishes the following types of articles: -Original research papers of any length -Short original research papers (less than 2500 words in length) -Scientific reviews -Forum articles covering general ornithological issues, including non-scientific ones -Short feedback articles that make scientific criticisms of papers published recently in the Journal.