Predator-prey collapses at the edge of predator distribution: the case of clupeids and common guillemots (Uria aalge) in NW Iberia

IF 0.8 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY
A. Martínez‐Abraín, P. Santidrián Tomillo, J. Mouriño, Juan Rodríguez-Silvar, Andrés Bermejo
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引用次数: 1

Abstract

The spatial structuring of seabird populations makes individual colonies very dependent on regional factors. That is especially the case in small edge populations located far from large colonies. We analysed retrospectively the poorly known collapse, some 50 years ago (around 1962-1973), of a relatively small population of breeding common guillemots (Uria aalge) located at their southernmost limit of distribution in Europe (NW Iberia). We assumed that guillemots behaved locally as facultative specialists in small pelagic fish due to the occurrence of a strong clupeid fishery, and we studied the association between the guillemot collapse and annual regional landings of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus), used as a proxy of total stock size. The overall relationship between ln-transformed guillemot counts (May-June) and ln-transformed sardine landings (May-October) was stronger than the fit on untransformed variables (r2 =0.52 vs. 0.27), indicating an exponential relationship between the non-transformed variables. This relationship was somewhat stronger and linear after the collapse, when only a few tens of guillemots remaining (r2 =0.60). A strong regime shift in sardine landings was detected in 1968 and also in anchovy landings in 1969. The overall relationship between guillemot numbers and anchovy landings was linear and strong (r2 =0.72) but completely dependent on the large 1960s estimate of guillemots. However, no relationship was found between guillemot numbers and anchovy landings (April-June) after the guillemot collapse. The most likely period for the guillemot collapse was therefore 1968-1970, as seabird colonies are known to collapse immediately after their staple prey crashes. Local guillemot colonies were not subsequently rescued by immigration and have remained empty or almost empty until present, showing the high sensitivity of edge populations to environmental variability at the regional scale.
捕食者的猎物在捕食者分布的边缘崩溃:以伊比利亚西北部的clupeids和普通海鸠(Uria aalge)为例
海鸟种群的空间结构使个体群落非常依赖于区域因素。尤其是在远离大型殖民地的小边缘种群中。我们回顾性地分析了大约50年前(大约1962-1973年),一个相对较少的繁殖普通海鸠种群(Uria aalge)在欧洲(伊比利亚西北部)的最南端的崩溃,这一点鲜为人知。我们假设,由于出现了强大的集群渔业,海鸠在当地表现为小型中上层鱼类的兼性专家,我们研究了海鸠的崩溃与沙丁鱼(Sardina pilchardus)和凤尾鱼(Engraulis encrasicolus)的年度区域性上岸之间的关系,这两种鱼被用作总种群规模的代表。ln转化的海鸠数量(5月-6月)和ln转化的沙丁鱼上岸量(5月-10月)之间的总体关系强于对未转化变量的拟合(r2=0.52对0.27),表明未转化变量之间存在指数关系。这种关系在崩溃后变得更加强烈和线性,当时只剩下几十只海鸠(r2=0.60)。1968年在沙丁鱼上岸和1969年在凤尾鱼上岸中都发现了强烈的政权转变。海鸠数量和鳀鱼上岸量之间的总体关系是线性的,很强(r2=0.72),但完全取决于20世纪60年代对海鸠的大量估计。然而,在海鸠崩溃后(4月至6月),海鸠数量与凤尾鱼上岸量之间没有关系。因此,海鸠最有可能崩溃的时期是1968-1970年,因为众所周知,海鸟群落在主要猎物崩溃后立即崩溃。当地的海鸠群落随后没有被移民拯救,直到现在一直是空的或几乎是空的,这表明边缘种群对区域范围内的环境变化高度敏感。
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来源期刊
Scientia Marina
Scientia Marina 生物-海洋与淡水生物学
CiteScore
2.10
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Scientia Marina is the successor to Investigación Pesquera, a journal of marine sciences published since 1955 by the Institut de Ciències del Mar de Barcelona (CSIC). Scientia Marina is included in the Science Citation Index since 1998 and publishes original papers, reviews and comments concerning research in the following fields: Marine Biology and Ecology, Fisheries and Fisheries Ecology, Systematics, Faunistics and Marine Biogeography, Physical Oceanography, Chemical Oceanography, and Marine Geology. Emphasis is placed on articles of an interdisciplinary nature and of general interest.
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