The benefit to some minnows of spawning in the nests of other species

Illinois Natural History Survey; Forest Hydrology Laboratory
Environmental Biology of Fishes (Impact Factor: 1.31). 05/1994; 40(2):213-218. DOI: 10.1007/BF00002547

ABSTRACT Fishes that act as nest associates spawn simultaneously with nest-building hosts and then abandon their eggs. The proposed benefit for this behavior is increased brood survivorship, arising from the physical environment provided by the nest or the parental care provided by the host. Field and enclosure experiments indicated that associates benefit from the parental care provided by the host, and not from the physical environment provided by the nests of hosts. This information, along with the effect of nest association on host reproductive success, is necessary before the nature of this nesting symbiosis can be characterized.

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    ABSTRACT: Aquatic biodiversity continues to decline as humans modify the landscape, mainly because of stream habitat alterations and loss caused by urban development. Bluehead chubs may mitigate some effects of instream habitat degradation by providing clean gravel substrate via their spawning nests. We used path analysis, an extension of multiple linear regression, to explore the relationships among instream habitat degradation, adult chub abundance, chub nesting activity, and chub reproductive performance. Age-0 chub abundance was best explained by small adult abundance and nest abundance. Habitat disturbance indirectly and negatively influenced age-0 chub abundance through adult chubs and nest abundance. Percentages of pool and run habitat also had indirect negative effects on age-0 chub abundance. Several metrics of chub nesting activity (nest density [proportion of substrate occupied by nests], average nest size, and number of nests) were explained by both adult chub abundance and nesting site conditions. Variability among stream systems described significant variation in adult chub abundance and nesting characteristics and, if unaccounted for, would have resulted in large unexplained variability. Chub nesting activity served as a link between habitat degradation, adult chub abundance, and their reproductive performance. Our study provides preliminary evidence that bluehead chubs’ nesting activity may be a mechanism of their persistence in degraded stream reaches. We recommend confirmatory studies through in-stream manipulative experiments. KeywordsPopulation persistence–Urbanization–Path analysis–Bluehead chub–Stream
    Environmental Biology of Fishes 01/2011; 90(4):379-391. · 1.31 Impact Factor
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    ABSTRACT: Conspecific brood parasitism is a subtle reproduction tactic often performed by many species. The parasitizing females lay eggs in the nest of another female of the same species, and the hosting female then incubates and raises both her own and the parasite’s offspring. Is it highly discussed why the hosting females allow this parasitism, whether she is able to detect it, or if she receives more benefits than costs by allowing it. One benefit could be that the female “dilutes” her own offspring’s chance of being caught by predators. The objects of this study were to examine some of the theories around conspecific brood parasitism in a high arctic population of Common eider (Somateria mollissima), especially if there was any correlation between body condition and parasitism, and number of neighbors laying at the same time. The results show no difference in condition between parasitized and non-parasitized females, but there is a significant relation between parasitism and number of neighbors laying eggs at the same time, and also between nest attendance and egg predation. I also found that both parasitism and egg predation seem to influence number of eggs laid by the host, indicating that the hosts are capable of both up- and down regulating their own clutch size in response to natural egg predation and parasitism.
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    ABSTRACT: Subtidal spawning of the cottid fish Enophrys bison occurs in southern British Columbia, where in the field a smaller subtidal cottid, Asemichthys taylori, exclusively utilizes E. bison nests by overlaying its own eggs on top of the E. bison eggs. In the laboratory, spawning of A. taylori in the absence of E. bison nests was observed to occur adjacent to eggs of another sculpin, Icelinus borealis, but no spawning of A. taylori was observed in the field in association with nests of any fish other than E. bison. The E. bison male guards the composite cluster of egg masses, and the A. taylori eggs hatch faster than the earlier laid E. bison eggs. Enophrys bison embryonic development appears retarded by overlying A. taylori eggs so the spawning by A. taylori on E. bison egg masses is a form of nesting parasitism, a behavior previously unknown among marine fishes. This study is the first report of interspecific nesting for marine fishes.
    Ichthyological Research 01/2011; · 0.90 Impact Factor


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Aug 13, 2014