The official peer-reviewed publication of ©The Society of Population Ecology, publishes original research articles and reviews. Special Features are in Moment⚡️
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ALT Graphical abstract: We evaluated demographic responses of an enclosed population of brown treesnakes to two experimental perturbations: supplemental feeding followed by removal of the adult and sub-adult cohort 2 years later. Our results indicate that adding food to the system increased the population growth rate by 50% within 6 months and that removing the adults and large sub-adults temporarily suppressed growth and survival; however, the population growth rate recovered within a year. These findings provide insight into population dynamics that may influence current control efforts on the island of Guam and any future invasions into new areas.
ALT Graphical abstract: This study examined how the exotic plant Solidago altissima responds to herbivory by two insect species with contrasting feeding modes: sap-feeding aphids and mesophyll-feeding lace bugs. Using a greenhouse experiment, we measured plant growth, water content, elemental composition, and phenolics across leaves, stems, and roots. Lace bug herbivory markedly reduced leaf dry mass and stem water content and altered nitrogen allocation patterns, including a reduced proportion of nitrogen allocated to leaves. In contrast, aphid herbivory caused no significant changes. These results indicate that S. altissima exhibits stronger physiological responses to mesophyll-feeding lace bugs than to aphids.
ALT Graphical abstract: This study examined how the exotic plant Solidago altissima responds to herbivory by two insect species with contrasting feeding modes: sap-feeding aphids and mesophyll-feeding lace bugs. Using a greenhouse experiment, we measured plant growth, water content, elemental composition, and phenolics across leaves, stems, and roots. Lace bug herbivory markedly reduced leaf dry mass and stem water content and altered nitrogen allocation patterns, including a reduced proportion of nitrogen allocated to leaves. In contrast, aphid herbivory caused no significant changes. These results indicate that S. altissima exhibits stronger physiological responses to mesophyll-feeding lace bugs than to aphids.
ALT Graphical abstract: In this study, we examined the relationships between land cover, food supply, and the diet composition of breeding Eurasian sparrowhawks (Accipiter nisus) and tested the effect of several prey species characteristics on the sparrowhawks' prey selection. Land cover affected the structure of food supply as well as the sparrowhawks' diet composition. Intermediate body mass, lower population density, and brighter plumage colouration of prey species were associated with increased vulnerability to sparrowhawk predation.
ALT Graphical abstract: In this study, we examined the relationships between land cover, food supply, and the diet composition of breeding Eurasian sparrowhawks (Accipiter nisus) and tested the effect of several prey species characteristics on the sparrowhawks' prey selection. Land cover affected the structure of food supply as well as the sparrowhawks' diet composition. Intermediate body mass, lower population density, and brighter plumage colouration of prey species were associated with increased vulnerability to sparrowhawk predation.
ALT Graphical abstract: In this study, we aimed to estimate the number of nuisance bears based on damage and occurrence reports collected from 2009 to 2023 in the Oshima Peninsula, Hokkaido. For the estimation, we assessed the harmfulness level (from Condition 0 to 3) of the bears based on the details of the reports and developed a method to remove double or more overcounts of a bear derived from multiple reports on the same single bear. Estimating the number of nuisance individuals involved in conflict by setting a specific criterion provides a more valuable evaluation indicator for adaptive management than simply using the number of occurrences alone.
ALT Graphical abstract: In this study, we aimed to estimate the number of nuisance bears based on damage and occurrence reports collected from 2009 to 2023 in the Oshima Peninsula, Hokkaido. For the estimation, we assessed the harmfulness level (from Condition 0 to 3) of the bears based on the details of the reports and developed a method to remove double or more overcounts of a bear derived from multiple reports on the same single bear. Estimating the number of nuisance individuals involved in conflict by setting a specific criterion provides a more valuable evaluation indicator for adaptive management than simply using the number of occurrences alone.