A mathematical model predicting the abundance and spatio-temporal dispersal of adfluvial salmonid (Salvelinus malma) fry in a stream

Lobyrev, F.; Gallagher, C.P.; Emeliyanenko, P.

Авторы: Lobyrev Feodor, Gallagher Colin P., Emeliyanenko Pavel
Журнал: Ecological Informatics
Том: 78
Год издания: 2023
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 1
Последняя страница: 10
Номер статьи: 102359
DOI: 10.1016/j.ecoinf.2023.102359
Аннотация: Models describing the spatial and temporal distributions of fishes are necessary for conservation and managementof populations and their habitats. The early life stages of fishes are a particularly important period that caninfluence population dynamics and fisheries productivity. The fry of riverine migratory fish species are particularlyinfluenced by downstream transport although relatively few models have been used to predict spatiotemporalabundance and dispersion of fry in combination with life history parameters in unperturbed habitats.We present a novel model predicting the downstream dispersal of age-0 adfluvial Dolly Varden in aspawning stream draining into Kronotskoye Lake basin, Kamchatka Peninsula, Russia. The model accounted forthe number of and distance between known spawning grounds, diel activity, daily fish growth, and intra-specificdiversity (i.e., morphotype) to describe how fry abundance changed at a specific stream location over the courseof spring and summer. Data were collected using a trapnet monitored periodically during spring and summer torecord changes in abundance, size (growth), and life history composition (‘nosed’ or ‘white’ morphotype) of fishbetween age-0 and -2. The experimental data were fitted to the model using a gradient descent optimizationalgorithm and a mean squared error loss function was used to verify how well experimental data fit to thetheoretical model. The predicted abundance of age-0 fish was 18,831 with a mean dispersion rate of ~36 m/dayand a transit time between spawning area and stream mouth ranging 32–76 days. The catch was mainlycomprised (81%) of the slower growing ‘nosed’ morphotype and exhibited variation in abundance over time anddecreased considerably by the end of summer. Our comprehensive model will be useful to simulate the downstreamdispersal of salmonid fishes whose early life stages inhabit riverine systems.
Добавил в систему: Лобырев Федор Сергеевич

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A mathematical model predicting the abundance and spatio-temporal dispersal of adfluvial salmonid (Salvelinus malma) fry in a streamстатья

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