Stress resistance as a component of dispersal syndromes in the non-native Merizodus soledadinus on Kerguelen islands

Global changes and human activities have increased the likelihood of transport of non-native insect species all around the globe. When established, the spread of organisms leads to the spatial sorting of the populations, progressively contributing to the selection of individuals with enhanced dispersal performance at the edges of the invaded range. During dispersal, propagules are also subjected to contrasting environmental conditions that can be stressful. These include temperature extremes and variations, desiccation and the quantity and quality of food, which can impose physiological constraints. As a consequence, dispersal syndrome may be promoted along invasion gradients with individuals being characterized by higher stress tolerance in addition to higher dispersal capacities. However, only few studies have examined the differences in stress resistance of non-native insect populations along their invasion gradient. Merizodus soledadinus (Guérin-Méneville, 1830) is a non-native inse..., Insect collection
Adults of M. soledadinus were hand-collected from six distinct localities of the Kerguelen Islands (48°25’ – 50°S; 68°27’ – 70°35’E) during the austral summer 2015 - 2016: Port Couvreux (the unique site of introduction of the beetle), Cataractes, Anse du Pacha, Pointe Suzanne, Isthme Bas and Val Studer (all localities are at least 8 km apart, with the furthest being more than 50 km apart, Figure 1). The austral summer (from September to April) corresponds to the maximum period of emergence for M. soledadinus on the Kerguelen Islands (Ouisse et al. 2017). We collected adults in December 2015 - January 2016, to maximize the collection of newly emerged individuals. All of the localities where specimens of M. soledadinus were collected are coastal, except Val Studer which lies around 7.2 km from the coastline. All sampling sites host large densities of M. soledadinus, for which the year of establishment is known, and therefore the time elapsed since colonization (hereafter..., , # Stress resistance as a component of dispersal syndromes in the non-native Merizodus soledadinus on Kerguelen islands
[https://doi.org/10.5061/dryad.05qfttfbc](https://doi.org/10.5061/dryad.05qfttfbc)

**Natural range expansion promotes stress resistance as a component of dispersal syndromes in non-native insects**

Data for the evaluation of the stress resistance of Merizodus soledadinus on the Kerguelen Islands.

Adults of *M. soledadinus* were hand-collected from six distinct localities of the Kerguelen Islands (48°25’ – 50°S; 68°27’ – 70°35’E) during the austral summer 2015 - 2016: Port Couvreux (the unique site of introduction of the beetle), Cataractes, Anse du Pacha, Pointe Suzanne, Isthme Bas and Val Studer.

Contact Charly Géron ([charly.geronmailtogmail.com]) with any questions. This manuscript has been accepted for publication (01/20/2025):

**Natural range expansion promotes stress resistance as a component of dispersal syndromes in non-native insects**

Charly Géron1, Stép...

全球变化与人类活动已提升了非本地昆虫物种在全球范围内的传播概率。当种群建立后，生物的扩散会引发种群的空间分选（spatial sorting），逐步推动入侵范围边缘具有增强扩散能力的个体被选择。在扩散过程中，繁殖体（propagules）还会面临具有压力的异质环境条件，包括极端温度与温度波动、干燥（desiccation）以及食物的数量与质量，这些均会施加生理限制。因此，扩散综合征（dispersal syndrome）可能沿入侵梯度被促进，其个体特征为除更高扩散能力外，还具备更强的压力耐受能力。然而，仅有少量研究考察了非本地昆虫种群沿其入侵梯度的抗逆性差异。

Merizodus soledadinus（Guérin-Méneville，1830）是一种非本地昆虫……，昆虫采集

Merizodus soledadinus成虫于2015-2016年南半球夏季（austral summer）从克尔格伦群岛（Kerguelen Islands，48°25′–50°S；68°27′–70°35′E）的六个不同地点手工采集：Port Couvreux（该甲虫的唯一引入地点）、Cataractes、Anse du Pacha、Pointe Suzanne、Isthme Bas及Val Studer（所有地点间距至少8公里，最远超过50公里，图1）。南半球夏季（9月至4月）对应克尔格伦群岛上M. soledadinus的最大羽化期（Ouisse等，2017）。我们于2015年12月至2016年1月采集成虫，以最大化新羽化个体的采集量。所有采集M. soledadinus标本的地点均为沿海区域，除Val Studer外，其距海岸线约7.2公里。所有采样点均存在高密度的M. soledadinus种群，其建立年份已知，因此自定殖以来的时间（以下简称……）

# 克尔格伦群岛非本地昆虫Merizodus soledadinus扩散综合征中的抗逆性成分
[https://doi.org/10.5061/dryad.05qfttfbc](https://doi.org/10.5061/dryad.05qfttfbc)

**自然范围扩张促进非本地昆虫扩散综合征中的抗逆性**

用于评估克尔格伦群岛Merizodus soledadinus抗逆性的数据。

*M. soledadinus*成虫于2015-2016年南半球夏季从克尔格伦群岛（48°25′–50°S；68°27′–70°35′E）的六个不同地点手工采集：Port Couvreux（该甲虫的唯一引入地点）、Cataractes、Anse du Pacha、Pointe Suzanne、Isthme Bas及Val Studer。

如有疑问，请联系Charly Gérons（邮箱：charly.geronmailtogmail.com）。本手稿已被接受发表（2025年1月20日）：

**自然范围扩张促进非本地昆虫扩散综合征中的抗逆性**

Charly Gérons1, Stép...