Prevalence, intensity of infestation, and biomarker potential of the nemertean worm, Carcinonemertes carcinophila (Kölliker, 1845), on ovigerous blue crabs, Callinectes sapidus Rathbun, 1896 (Decapoda: Brachyura: Portunidae), in Chesapeake Bay, USA
Prevalence, intensity of infestation, and biomarker potential of the nemertean worm, Carcinonemertes carcinophila (Kölliker, 1845), on ovigerous blue crabs, Callinectes sapidus Rathbun, 1896 (Decapoda: Brachyura: Portunidae), in Chesapeake Bay, USA
复制标题
美国切萨皮克湾纽虫类蠕虫 Carcinonemertes carcinophila (Kölliker, 1845) 在产卵蓝蟹 Callinectes sapidus Rathbun, 1896（十足目：Brachyura：Portunidae）上的流行率、感染强度和生物标志物潜力
DOI：
10.1093/jcbiol/ruad074
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发表时间：
2023
影响因子：
1.1
通讯作者：
Shields, Jeffrey D
中科院分区：
文献类型：
--
作者：
Schneider, Alexandra K;Pomroy, Alexandria K;Shields, Jeffrey D
对个体和种群水平的卵死亡率的影响进行量化，对于维持可持续的甲壳类渔业十分重要。纽虫Carcinonemertes carcinophila（Köliker，1845）是大西洋蓝蟹Callinectes sapidus的卵捕食者;然而，人们对这种纽虫对蓝蟹繁殖的影响知之甚少。我们评估的患病率和强度的寄生虫产卵蓝蟹使用渔业独立拖网调查。在2022年5月至9月的螃蟹初级产卵期，收集了126只产卵雌性并分析了蠕虫。在这段时间内的患病率为66.6%，平均育雏感染为53.9蠕虫每感染螃蟹主机。通过为期6天的微宇宙实验，对纽形虫卵的消耗进行了定量。在实验中的48只蠕虫中，71%的蠕虫主动进食蟹卵，其消耗量为0.16-4.5个卵/天。消费率被用来估计人口水平的影响，nemertean喂养对蟹育雏死亡率。每只蟹的育雏损失比例为0- 0.0044%。在目前的患病率和强度的侵扰，由nemerteans卵消费有一个可以忽略不计的影响，蓝蟹繁殖输出和批量繁殖力在切萨皮克湾。我们还调查了使用成熟的纽形虫作为生物标志物，建立产卵的历史卵雌蓝蟹，并确定存在的蠕虫在离合器和鳃可以用来指示奇偶性卵雌蟹。
The effect of individual and population-level egg mortality is important to quantify to maintain sustainable crustacean fisheries. The nemertean wormCarcinonemertes carcinophila(Kölliker, 1845) is an egg predator of the Atlantic blue crab,Callinectes sapidus; however, little is known about the impact this nemertean has on the reproduction of the blue crab. We assessed the prevalence and intensity of the infestation of nemerteans in ovigerous blue crabs using a fishery-independent trawl survey. During the primary spawning period of the crab, May–September 2022, 126 ovigerous females were collected and analyzed for worms. Prevalence over this time was 66.6% and mean brood infestation was 53.9 worms per infested crab host. Nemertean egg consumption was quantified with a six-day microcosm experiment. Of the 48 worms in the experiment, 71% actively fed on crab eggs and their consumption ranged 0.16–4.5 eggs day–1. Consumption rates were used to estimate population-level impact of nemertean feeding on crab brood mortality. Modeled proportions of brood loss per crab ranged 0–0.0044%. At the current prevalence and intensity of infestation, egg consumption by nemerteans has a negligible effect on blue crab reproductive output and batch fecundity in Chesapeake Bay. We also investigated the use of mature nemertean worms as a biomarker for establishing the spawning history of ovigerous female blue crabs and determined that the presence of worms in the clutch and in the gills can be used to indicate parity in ovigerous female crabs.