Predator-mediated resource limitation shapes body and head size variation in stickleback populations

Predator and prey communities are key drivers of phenotypic variation in consumers, yet the ecological interactions shaping these traits remain understudied in natural food webs. This dataset supports a comparative study examining how phenotypic variation in 34 Greenlandic threespine stickleback (Gasterosteus aculeatus) populations is influenced by the presence of an intraguild predator, Arctic char (Salvelinus alpinus). The dataset includes morphological measurements of stickleback body and head size, zooplankton community composition, and biomass estimates. Our findings indicate that in the presence of Arctic char, stickleback exhibit larger body sizes with relatively smaller heads, consistent with resource-mediated ontogenetic shifts observed in other fishes. Path analysis suggests that predator-mediated changes in zooplankton communities partially explain this shift, highlighting indirect effects of top predators on consumer resource limitation and allometric trait variation. This d..., , # Predator-mediated resource limitation shapes body and head size variation in stickleback populations

Dataset DOI: [10.5061/dryad.8gtht770p](10.5061/dryad.8gtht770p)

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## Dataset Description

This dataset accompanies the study investigating how the presence of an intraguild predator (Arctic char, *Salvelinus alpinus*) influences phenotypic variation in Greenlandic threespine stickleback (*Gasterosteus aculeatus*). Specifically, it includes morphological measurements of stickleback populations, zooplankton community composition, and biomass estimates, as well as measures of Lake morphometry. Additionally it containes the photos taken of the stickleback specimen for morphological measurements. The dataset can be used to explore trophic interactions, consumer trait allometry, and predator-induced selection pressures.

### Files and variables

#### File: Fish\_data.csv

**Description:** Fish population identity and morphological variables: 

For a description of the morphological measur...,

捕食者与猎物群落是消费者表型变异（phenotypic variation）的关键驱动因素，但自然食物网中塑造这些性状的生态相互作用仍未得到充分研究。本数据集支撑一项比较研究，旨在探究34个格陵兰三刺棘鱼（threespine stickleback, Gasterosteus aculeatus）种群的表型变异如何受到种内捕食者（intraguild predator）北极红点鲑（Arctic char, Salvelinus alpinus）存在的影响。数据集包含棘鱼身体与头部大小的形态学测量数据、浮游动物群落组成以及生物量估算值。本研究结果显示，在北极红点鲑存在的环境中，棘鱼体型更大但头部相对更小，这与其他鱼类中观测到的资源介导的个体发育转变相一致。路径分析（path analysis）表明，捕食者介导的浮游动物群落变化可部分解释这一性状转变，凸显了顶级捕食者对消费者资源限制与异速生长性状变异的间接影响。本数据集关联的研究论文标题为：# 捕食者介导的资源限制塑造棘鱼种群的身体与头部大小变异

数据集DOI：[10.5061/dryad.8gtht770p](10.5061/dryad.8gtht770p)

# 数据集说明
本数据集配套于一项探究种内捕食者（北极红点鲑，Salvelinus alpinus）的存在如何影响格陵兰三刺棘鱼（Gasterosteus aculeatus）表型变异的研究。具体而言，数据集包含棘鱼种群的形态学测量数据、浮游动物群落组成与生物量估算值，以及湖泊形态测量参数。此外还包含用于形态学测量的棘鱼标本照片。该数据集可用于探究营养级相互作用、消费者性状异速生长以及捕食者诱导的选择压力。

### 文件与变量
#### 文件：Fish_data.csv
**描述：** 鱼类种群身份信息与形态学变量：
有关形态学测量的详细说明……