Linking demographic transitions to population dynamics in a fluctuating environment

Linking demographic transitions to population dynamics in a fluctuating environment
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将人口变化与波动环境中的人口动态联系起来

DOI:
10.1139/cjfas-2020-0101
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发表时间:
2021
影响因子:
2.4
通讯作者:
Trexler, Joel C.
Trexler, Joel C.
中科院分区:
农林科学2区
文献类型:
--
作者:
Gatto, John V.;Kline, Jeffrey L.;Loftus, William F.;Trexler, Joel C.

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Recruitment has been linked to decreases in the ratio of age-specific mortality (M′) to mass-specific growth (G′), and year-class strength may be predicted by the age whenM′/G′ = 1. Hydrological stress adversely affects these parameters for species inhabiting floodplains; however, the relationship betweenM′ andG′ in hydrologically variable environments is poorly understood. We evaluated age-specific mortality for six species from a 20-year time series and growth curves from otolith length-at-age data. We assessed the effect of hydrology on the transitional age (ageM′/G′ = 1) at 21 sites representing a hydrological gradient. Disturbance intensity influenced age-specific mortality but had no effect on mass-specific growth. The transitional age was inversely correlated with annual density, but weakly associated with population biomass. Hydrological disturbance shifted the transitional age to older ages, reducing recruitment overall. We demonstrated that theM′/G′ transition was affected adversely by hydrological stress and can be applied to a diverse group of taxa. Growth, survivorship, and the transitional age should be evaluated to improve population modelling efforts used to predict the influence of future restoration actions.
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