Differential population responses of native and alien rodents to an invasive predator, habitat alteration and plant masting

Fukasawa, Keita; Miyashita, Tadashi; Hashimoto, Takuma; Tatara, Masaya; Abe, Shintaro

doi:10.1098/rspb.2013.2075

Cited by 32 publications

(29 citation statements)

References 56 publications

(68 reference statements)

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“…However, agricultural land-use and flood regulation have considerably modified the floodplain ecosystem: flooding is contained by a dyke and the ground water level has decreased (Hölzel & Otte, 2001). Artificial modifications of the environment can change selection regimes and facilitate the establishment of non-native species (Byers, 2002;Crooks, Chang, & Ruiz, 2011;Fukasawa, Miyashita, Hashimoto, Tatara, & Abe, 2013;Tyrrell & Byers, 2007). Thus, it is possible that A. sagittata migrated into the floodplain ecosystem after human river regulation decreased the frequency and severity of flooding.…”

Section: First Documented Presence Of a Sagittata In Floodplain Mementioning

confidence: 99%

Strengths and potential pitfalls of hay transfer for ecological restoration revealed by RAD‐seq analysis in floodplain Arabis species

et al. 2019

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Achieving high intraspecific genetic diversity is a critical goal in ecological restoration as it increases the adaptive potential and long‐term resilience of populations. Thus, we investigated genetic diversity within and between pristine sites in a fossil floodplain and compared it to sites restored by hay transfer between 1997 and 2014. RAD‐seq genotyping revealed that the stenoecious floodplain species Arabis nemorensis is co‐occurring with individuals that, based on ploidy, ITS‐sequencing and morphology, probably belong to the close relative Arabis sagittata, which has a documented preference for dry calcareous grasslands but has not been reported in floodplain meadows. We show that hay transfer maintains genetic diversity for both species. Additionally, in A. sagittata, transfer from multiple genetically isolated pristine sites resulted in restored sites with increased diversity and admixed local genotypes. In A. nemorensis, transfer did not create novel admixture dynamics because genetic diversity between pristine sites was less differentiated. Thus, the effects of hay transfer on genetic diversity also depend on the genetic make‐up of the donor communities of each species, especially when local material is mixed. Our results demonstrate the efficiency of hay transfer for habitat restoration and emphasize the importance of prerestoration characterization of microgeographic patterns of intraspecific diversity of the community to guarantee that restoration practices reach their goal, that is maximize the adaptive potential of the entire restored plant community. Overlooking these patterns may alter the balance between species in the community. Additionally, our comparison of summary statistics obtained from de novo‐ and reference‐based RAD‐seq pipelines shows that the genomic impact of restoration can be reliably monitored in species lacking prior genomic knowledge.

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Section: First Documented Presence Of a Sagittata In Floodplain Mementioning

confidence: 99%

Strengths and potential pitfalls of hay transfer for ecological restoration revealed by RAD‐seq analysis in floodplain Arabis species

et al. 2019

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“…To prove causal relationships, we need to examine the positive responses of populations of native species after the removal of invasive predators (Park ; Fukasawa et al. in press).…”

Section: Discussionmentioning

confidence: 99%

Evaluating the “recovery level” of endangered species without prior information before alien invasion

Watari¹,

Nishijima

Fukasawa

et al. 2013

Ecology and Evolution

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For maintaining social and financial support for eradication programs of invasive species, quantitative assessment of recovery of native species or ecosystems is important because it provides a measurable parameter of success. However, setting a concrete goal for recovery is often difficult owing to lack of information prior to the introduction of invaders. Here, we present a novel approach to evaluate the achievement level of invasive predator management based on the carrying capacity of endangered species estimated using long-term monitoring data. In Amami-Oshima Island, Japan, where the eradication project of introduced small Indian mongoose is ongoing since 2000, we surveyed the population densities of four endangered species threatened by the mongoose (Amami rabbit, the Otton frog, Amami tip-nosed frog, and Amami Ishikawa's frog) at four time points ranging from 2003 to 2011. We estimated the carrying capacities of these species using the logistic growth model combined with the effects of mongoose predation and environmental heterogeneity. All species showed clear tendencies toward increasing their density in line with decreased mongoose density, and they exhibited density-dependent population growth. The estimated carrying capacities of three endangered species had small confidence intervals enough to measure recovery levels by the mongoose management. The population density of each endangered species has recovered to the level of the carrying capacity at about 20–40% of all sites, whereas no individuals were observed at more than 25% of all sites. We propose that the present approach involving appropriate monitoring data of native organism populations will be widely applicable to various eradication projects and provide unambiguous goals for management of invasive species.

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“…Animal density at each plot and trapping session was estimated as catch per unit effort, evaluated as the number of unique animals captured per trap night (Fukasawa et al . ).…”

Section: Methodsmentioning

confidence: 97%

“…On the day of capture, animals were marked with individual metal ear tags, weighed and checked for sex and reproductive condition. Animal density at each plot and trapping session was estimated as catch per unit effort, evaluated as the number of unique animals captured per trap night (Fukasawa et al 2013).…”

Section: A N I M a L C A P T U R E A N D M A N I P U L A T I O Nmentioning

confidence: 99%

Large wildlife removal drives immune defence increases in rodents

et al. 2015

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Summary 1.Anthropogenic disturbances involving land use change, climate disruption, pollution and invasive species have been shown to impact immune function of wild animals. These immune changes have direct impacts on the fitness of impacted animals and, also, potentially indirect effects on other species and on ecological processes, notably involving the spread of infectious disease. Here, we investigate whether the selective loss of large wildlife can also drive changes in immune function of other consumer species. 2. Using a long-standing large-scale exclosure experiment in East Africa, we investigated the effects of selective removal of large wildlife on multiple measures of immune function in the dominant small rodent in the system, the East African pouched mouse, Saccostomus mearnsi. 3. We find support for a general increase in immune function in landscapes where large wildlife has been removed, but with some variation across immune parameters. These changes may be mediated in part by increased pathogen pressure in plots where large wildlife has been removed due to major increases in rodent density in such plots, but other factors such as changes in food resources are also likely involved. 4. Overall, our research reveals that the elimination of large-bodied wildlife -now recognized as another major form of global anthropogenic change -may have cascading effects on immune health, with the potential for these effects to also impact disease dynamics in ecological communities.

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Differential population responses of native and alien rodents to an invasive predator, habitat alteration and plant masting

Cited by 32 publications

References 56 publications

Strengths and potential pitfalls of hay transfer for ecological restoration revealed by RAD‐seq analysis in floodplain Arabis species

Strengths and potential pitfalls of hay transfer for ecological restoration revealed by RAD‐seq analysis in floodplain Arabis species

Evaluating the “recovery level” of endangered species without prior information before alien invasion

Large wildlife removal drives immune defence increases in rodents

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