气候变化领域集成服务门户(CCPortal): Shrinking body size of European anchovy in the Bay of Biscay

CCPortal

DOI	10.1111/gcb.17047
	Shrinking body size of European anchovy in the Bay of Biscay
	Taboada, Fernando G.; Chust, Guillem; Santos Mocoroa, Maria; Aldanondo, Naroa; Fontan, Almudena; Cotano, Unai; Alvarez, Paula; Erauskin-Extramiana, Maite; Irigoien, Xabier; Fernandes-Salvador, Jose A.; Boyra, Guillermo; Uriarte, Andres; Ibaibarriaga, Leire
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	1
卷号	30 期号:1
英文摘要	Decreased body size is often cited as a major response to ocean warming. Available evidence, however, questions the actual emergence of shrinking trends and the prevalence of temperature-driven changes in size over alternative drivers. In marine fish, changes in food availability or fluctuations in abundance, including those due to size-selective fishing, provide compelling mechanisms to explain changes in body size. Here, based on three decades of scientific survey data (1990-2021), we report a decline in the average body size-length and weight-of anchovy, Engraulis encrasicolus L., in the Bay of Biscay. Shrinking was evident in all age classes, from juveniles to adults. Allometric adjustment indicated slightly more pronounced declines in weight than in total length, which is consistent with a change toward a slender body shape. Trends in adult weight were nonlinear, with rates accelerating to an average decline of up to 25% decade(-1) during the last two decades. We found a strong association between higher anchovy abundance and reduced juvenile size. The effect of density dependence was less clear later in life, and temperature became the best predictor of declines in adult size. Theoretical analyses based on a strategic model further suggested that observed patterns are consistent with a simultaneous, opposing effect of rising temperatures on accelerating early growth and decreasing adult size as predicted by the temperature-size rule. Macroecological assessment of ecogeographical-Bergmann's and James'-rules in anchovy size suggested that the observed decline largely exceeds intraspecific variation and might be the result of selection. Limitations inherent in the observational nature of the study recommend caution and a continued assessment and exploration of alternative drivers. Additional evidence of a climate-driven regime shift in the region suggests, however, that shrinking anchovy sizes may signal a long-lasting change in the structure and functioning of the Bay of Biscay ecosystem.
英文关键词	Bergmann's rule; body size; Engraulis encrasicolus; European anchovy; James' rule; metabolic theory; ocean warming; temperature-size rule
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:001151213000061
来源期刊	GLOBAL CHANGE BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304893
作者单位	AZTI; University of Oviedo
推荐引用方式 GB/T 7714	Taboada, Fernando G.,Chust, Guillem,Santos Mocoroa, Maria,et al. Shrinking body size of European anchovy in the Bay of Biscay[J],2024,30(1).
APA	Taboada, Fernando G..,Chust, Guillem.,Santos Mocoroa, Maria.,Aldanondo, Naroa.,Fontan, Almudena.,...&Ibaibarriaga, Leire.(2024).Shrinking body size of European anchovy in the Bay of Biscay.GLOBAL CHANGE BIOLOGY,30(1).
MLA	Taboada, Fernando G.,et al."Shrinking body size of European anchovy in the Bay of Biscay".GLOBAL CHANGE BIOLOGY 30.1(2024).