Migratory redhorse suckers provide subsidies of nitrogen but not phosphorus to a spawning stream

IF 1.6 3区 农林科学 Q3 FISHERIES
Ryan R. Hudson, Kit Wheeler, Mack White, Justin N. Murdock
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Abstract

Spawning migrations of fishes are common case studies for examining the magnitude of resource subsidies; however, no studies have evaluated this phenomenon in iteroparous migrations of the Catostomid (i.e. suckers) genus Moxostoma (i.e. redhorses). Fish resource subsidies are usually represented as nitrogen (N) and phosphorus (P), and migratory redhorses can deliver these nutrients via excretion and eggs. We evaluated whether redhorses deliver N and P subsidies to Brasstown Creek—a fourth-order stream in the Southeastern US—during their spawning migrations. We measured individual-level nutrient contributions from excretion and eggs and extrapolated those values to estimate nutrient contributions based on daily abundances of migratory redhorses. We compared daily nutrient inputs to daily nutrient exports to determine the potential for resource subsidies. We estimated 71.6 kg of N and 4.4 kg of P were delivered to Brasstown Creek over a 98-day migration period. N input exceeded N export on 15 of the 98 days, but phosphorus input never exceeded P export. Eggs accounted for the majority of N and P input at 51% and 100% respectively. Redhorse N inputs peaked in the spring during a period of low N exports, suggesting that redhorse subsidies were delivered during times of elevated nutrient demand and relatively low nutrient availability. Suckers receive little management attention, and several species of redhorses are imperilled. Given our conclusion that redhorses provide a temporally critical N subsidy that is likely available to multiple consumers in freshwater food webs, this study provides compelling motivation for increased conservation of these species and their migrations.

洄游的红角吮吸鱼为产卵溪流提供了氮的补充,但没有提供磷的补充
鱼类的产卵洄游是研究资源补贴规模的常见案例研究;然而,还没有研究评估过 Catostomid(即吸盘鱼)属 Moxostoma(即红马)迭代洄游中的这一现象。鱼类资源补贴通常表现为氮(N)和磷(P),而洄游赤麻蛇能通过排泄物和卵提供这些营养物质。我们评估了红马在产卵洄游期间是否会向布拉斯敦溪--美国东南部的一条四级溪流--提供氮和磷补贴。我们测量了排泄物和卵在个体水平上对营养物质的贡献,并根据洄游赤麻马的日丰度推断出这些数值。我们将每日营养物质输入量与每日营养物质输出量进行比较,以确定资源补贴的可能性。据估计,在 98 天的迁徙过程中,有 71.6 千克氮和 4.4 千克磷被输送到布拉斯敦溪。在这 98 天中,有 15 天的氮输入量超过了氮输出量,但磷输入量从未超过磷输出量。卵占氮和磷输入量的大部分,分别为 51% 和 100% 。红马的氮输入量在春季氮输出量较低的时期达到峰值,这表明红马是在养分需求量增加而养分供应量相对较低的时期提供补贴的。吸水鱼很少受到管理部门的关注,而有几种红马已经濒临灭绝。鉴于我们的结论是,红马提供的氮补贴在时间上至关重要,淡水食物网中的多个消费者都可能获得这种补贴,这项研究为加强对这些物种及其迁徙的保护提供了令人信服的动力。
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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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