Larval cisco and lake whitefish exhibit high distributional overlap within nursery areas

IF 1.6 3区 农林科学 Q3 FISHERIES
Taylor A. Brown, Lars G. Rudstam, Jeremy P. Holden, Brian C. Weidel, Amanda S. Ackiss, Ann J. Ropp, Marc A. Chalupnicki, James E. McKenna Jr., Suresh A. Sethi
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引用次数: 1

Abstract

Coregonine fishes, including lake whitefish (Coregonus clupeaformis) and cisco (C. artedi), are socioecologically important in the Laurentian Great Lakes and of conservation concern, but the processes driving recruitment variability are unclear. In Lake Ontario, cisco and lake whitefish exhibit similar spawning behaviours and early life histories, but population trajectories are diverging. One hypothesis is that sympatric cisco and lake whitefish larvae occupy distinct habitats and experience dissimilar local environmental conditions, despite co-occurrence within nursery areas. We described the spatiotemporal distributions of larval cisco and lake whitefish among multiple Lake Ontario embayment nursery areas, characterised physical habitat features associated with their distributions, determined the degree of spatial habitat partitioning between species and evaluated how habitat niche divergence occurred along an ontogenetic progression. Both species were widely distributed across larval nursery areas, though lake whitefish were less abundant and more narrowly distributed than cisco. Within the yolk sac stage, lake whitefish occupied more nearshore, shallower and colder waters than cisco, indicating potential habitat niche partitioning between congeners. However, distributional differences were subtle and likely driven by differential hatch timing and staggered ontogenetic habitat shifts. Combined, our results illustrate similar habitat use between cisco and lake whitefish through the larval stage and demonstrate that ontogeny and species-specific phenology influence habitat use for these species. This study provides additional evidence that the early life histories of cisco and lake whitefish are highly similar and does not support the hypothesis that larval habitat use differences are a major driver of differential recruitment success for these species.

幼鱼和湖白鱼在苗圃内分布高度重叠
Coregonine鱼类,包括湖白鱼(Coregonus clupeaformis)和cisco (C. artedi),在Laurentian Great Lakes中具有重要的社会生态学意义和保护意义,但驱动招募变化的过程尚不清楚。在安大略湖,思科和湖白鱼表现出相似的产卵行为和早期生活史,但种群轨迹正在分化。一种假设是,同域cisco和湖白鱼的幼虫占据着不同的栖息地,经历着不同的当地环境条件,尽管它们在苗圃内共同出现。本文描述了安大略湖多个河口苗圃中cisco和lake whitfish的时空分布,描述了与其分布相关的物理栖息地特征,确定了物种之间的空间栖息地划分程度,并评估了栖息地生态位分化是如何沿着个体发生过程发生的。两者均广泛分布于幼鱼苗区,但湖白鱼数量较少,分布范围较窄。在卵黄囊期,湖白鱼比cisco鱼占据更多的近岸、较浅和较冷的水域,表明同系物之间存在潜在的生境生态位划分。然而,分布差异是微妙的,可能是由不同的孵化时间和交错的个体发育栖息地转移驱动的。综上所述,我们的研究结果表明,思科和湖白鱼在幼虫期对栖息地的利用相似,并表明个体发育和物种特异性物候对这些物种的栖息地利用有影响。该研究提供了额外的证据,证明思科和湖白鱼的早期生活史高度相似,但不支持幼虫栖息地使用差异是这些物种差异招募成功的主要驱动因素的假设。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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