气候变化领域集成服务门户(CCPortal): Individual growth rates and size at metamorphosis increase with watershed area in a stream salamander

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DOI	10.1002/ecy.4217
	Individual growth rates and size at metamorphosis increase with watershed area in a stream salamander
	Cochrane, Madaline M.; Addis, Brett R.; Swartz, Leah K.; Lowe, Winsor H.
发表日期	2024
ISSN	0012-9658
EISSN	1939-9170
起始页码	105
结束页码	2
卷号	105 期号:2
英文摘要	A fundamental goal of ecology is to understand how the physical environment influences intraspecific variability in life history and, consequently, fitness. In streams, discharge and associated habitat conditions change along a continuum from intermittency to permanence: Headwater streams typically have smaller watersheds and are thus more prone to drying than higher-order streams with larger watersheds and more consistent discharge. However, few empirical studies have assessed life history and associated population responses to this continuum in aquatic organisms. We tested the prediction that individual growth, rate of development, and population growth increase with watershed area in the long-lived stream salamander Gyrinophilus porphyriticus, where we use watershed area as a proxy for hydrologic intermittence. To address this hypothesis, we used 8 years of mark-recapture data from 53 reaches across 10 headwater streams in New Hampshire, USA. Individual growth rates and mean size at metamorphosis increased with watershed area for watersheds from 0.12 to 1.66 km2. Population growth rates increased with watershed area; however, this result was not statistically significant at our sample size. Mean age of metamorphosis did not vary across watershed areas. Lower individual growth rates and smaller sizes at metamorphosis likely contributed to reduced lifetime fecundity and population growth in reaches with the smallest watershed areas and highest vulnerability to drought. These responses suggest that as droughts increase due to climate change, headwater specialists in hydrologically intermittent environments will experience a reduction in fitness due to smaller body sizes or other growth-related mechanisms.
英文关键词	amphibian; development; discharge; Gyrinophilus porphyriticus; hydrologic intermittency; lambda; metamorphosis
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001134403000001
来源期刊	ECOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/297816
作者单位	University of Montana System; University of Montana; Montana State University System; Montana State University Bozeman
推荐引用方式 GB/T 7714	Cochrane, Madaline M.,Addis, Brett R.,Swartz, Leah K.,et al. Individual growth rates and size at metamorphosis increase with watershed area in a stream salamander[J],2024,105(2).
APA	Cochrane, Madaline M.,Addis, Brett R.,Swartz, Leah K.,&Lowe, Winsor H..(2024).Individual growth rates and size at metamorphosis increase with watershed area in a stream salamander.ECOLOGY,105(2).
MLA	Cochrane, Madaline M.,et al."Individual growth rates and size at metamorphosis increase with watershed area in a stream salamander".ECOLOGY 105.2(2024).