Genetic diversity of Ponto-Caspian amphipods throughout the invaded Baltic and native NW Black Sea donor ranges: does introduction mode matter?

Copilaş‐Ciocianu, Denis; Šidagytė-Copilas, Eglė; Son, Mikhail O.; Morhun, Halyna; Macher, Jan Niklas; Arbačiauskas, Кęstutis

doi:10.1007/s10750-023-05230-6

Cited by 3 publications

(1 citation statement)

References 73 publications

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“…Future phylogeographic studies will help refine our understanding of niche differentiation dynamics by taking evolutionary lineages into account. The genetic evidence accrued so far indicates that some focal species are comprised of two mitochondrial lineages, each endemic to either the Black Sea or Caspian Sea drainages (Cristescu et al, 2004;Cristescu & Hebert, 2005;Rewicz et al, 2015;Jażdżewska et al, 2020;Copilaș-Ciocianu et al, 2023a;Copilaş-Ciocianu et al, 2023). However, considering that their divergence is low and unconfirmed at the nuclear level, it is unclear whether these lineages are distinct evolutionary units equivalent to species.…”

Section: Dynamics Of Niche Differentiationmentioning

confidence: 99%

Climatic niche differentiation between native and non-native ranges is widespread in Ponto-Caspian amphipods

Šidagytė-Copilas

Copilaş‐Ciocianu

2023

Preprint

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1. Niche conservatism posits that a species' non-native populations establish in areas that match the native environmental conditions. Although the Ponto-Caspian region is a major source of inland aquatic alien species, the extent to which their climatic niches diverged between the invasive and native ranges remains poorly understood. 2. Using an n-dimensional hypervolume approach, we quantified climatic niche overlap and inferred patterns of niche differentiation (shift, contraction, or expansion) among native and invaded ranges for 12 widespread Ponto-Caspian amphipod species (six genera in three families). 3. Our results show that all investigated species experience substantially different climatic conditions in the invaded range. The invasive niche either contracted (five species), shifted (four species), expanded and shifted (two species), or shifted and contracted (one species) relative to the native niche. 4. We conclude that although the focal taxa share a common geographic origin and evolutionary history, they exhibit disparate patterns of climatic niche change outside the native range. The niche conservatism hypothesis receives mixed support given that half of the studied species underwent niche shifts/expansion. Furthermore, congeners exhibited both identical and contrasting patterns of niche differentiation, suggesting a limited phylogenetic effect. 5. The uncovered diversity of niche dynamics among closely related species indicates that each has a unique potential for invasiveness and long-term persistence. This has important implications for predicting invasion risk and refining management strategies.

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Section: Dynamics Of Niche Differentiationmentioning

confidence: 99%

Climatic niche differentiation between native and non-native ranges is widespread in Ponto-Caspian amphipods

Šidagytė-Copilas

Copilaş‐Ciocianu

2023

Preprint

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Invasive Ponto‐Caspian amphipods are less carnivorous outside their native range

Copilaș‐Ciocianu,

Garbaras,

Šidagytė‐Copilas

2024

Limnology & Oceanography

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A species' expansion beyond the native range is often assumed to be associated with an increased dietary niche breadth. However, empirical evidence remains limited due to a scarcity of studies comparing both the parental and invaded ranges. Here, we test the trophic niche expansion hypothesis by examining stable isotopes and functional morphology across native (NW Black Sea) and invaded (SE Baltic Sea) ranges of two amphipods, Dikerogammarus villosus and Pontogammarus robustoides, originating from the Ponto‐Caspian region—a major source of species invading Holarctic inland waters. Stable isotopes revealed that both species underwent a marked dietary niche contraction by becoming less carnivorous in the invaded range. This dietary shift was morphologically mirrored by an overall reduction of functional traits related to predation. The magnitude of dietary and morphological change was greater in D. villosus. Our findings indicate that previous experimental reports of aggressive predation in D. villosus reflect opportunistic foraging and align with local stable isotope studies which generally indicate a low trophic position. We conclude that Ponto‐Caspian species can undergo rapid dietary changes outside the native range, and that dietary niche expansion is not a prerequisite for successful non‐native establishment.

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Pathways of invasion of the threespine stickleback (Gasterosteus aculeatus) into the basins of the Black and Caspian seas

Bardukov,

Bugakov,

Gajduchenko

et al. 2024

Hydrobiologia

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Genetic diversity of Ponto-Caspian amphipods throughout the invaded Baltic and native NW Black Sea donor ranges: does introduction mode matter?

Cited by 3 publications

References 73 publications

Climatic niche differentiation between native and non-native ranges is widespread in Ponto-Caspian amphipods

Climatic niche differentiation between native and non-native ranges is widespread in Ponto-Caspian amphipods

Invasive Ponto‐Caspian amphipods are less carnivorous outside their native range

Pathways of invasion of the threespine stickleback (Gasterosteus aculeatus) into the basins of the Black and Caspian seas

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