Experimental evidence of dispersal of invasive cyprinid eggs inside migratory waterfowl.

Abstract:

:Fish have somehow colonized isolated water bodies all over the world without human assistance. It has long been speculated that these colonization events are assisted by waterbirds, transporting fish eggs attached to their feet and feathers, yet empirical support for this is lacking. Recently, it was suggested that endozoochory (i.e., internal transport within the gut) might play a more important role, but only highly resistant diapause eggs of killifish have been found to survive passage through waterbird guts. Here, we performed a controlled feeding experiment, where developing eggs of two cosmopolitan, invasive cyprinids (common carp, Prussian carp) were fed to captive mallards. Live embryos of both species were retrieved from fresh feces and survived beyond hatching. Our study identifies an overlooked dispersal mechanism in fish, providing evidence for bird-mediated dispersal ability of soft-membraned eggs undergoing active development. Only 0.2% of ingested eggs survived gut passage, yet, given the abundance, diet, and movements of ducks in nature, our results have major implications for biodiversity conservation and invasion dynamics in freshwater ecosystems.

authors

Lovas-Kiss Á,Vincze O,Löki V,Pallér-Kapusi F,Halasi-Kovács B,Kovács G,Green AJ,Lukács BA

doi

10.1073/pnas.2004805117

subject

Has Abstract

pub_date

2020-07-07 00:00:00

pages

15397-15399

issue

27

eissn

0027-8424

issn

1091-6490

pii

2004805117

journal_volume

117

pub_type

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