Evaluation of ongoing Crested Ibis (<i>Nipponia nippon</i>) reintroduction using an integrated population model and Bayesian population viability analysis

Okahisa, Yuji; Nagata, Hisashi

doi:10.1111/ibi.13071

Cited by 6 publications

(4 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The weak-competition scenario is likely in the reintroduction of extirpated species or long-lived endangered species. In fact, some of the best evidence for successful intentional release comes from conservation programs of such species ( 26 – 29 ). In the Sado Island (Japan), for example, the once-extirpated Crested Ibis Nipponia nippon showed exponential growth of the population since the initial reintroduction of 10 captive-bred individuals in 2008 ( 28 ).…”

Section: Resultsmentioning

confidence: 99%

“…In fact, some of the best evidence for successful intentional release comes from conservation programs of such species ( 26 – 29 ). In the Sado Island (Japan), for example, the once-extirpated Crested Ibis Nipponia nippon showed exponential growth of the population since the initial reintroduction of 10 captive-bred individuals in 2008 ( 28 ). Similarly, translocations of Humpback chub, a federally listed fish species in the United States, seem highly cost-effective in enhancing their tributary populations in the Little Colorado River ( 29 ).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Intentional release of native species undermines ecological stability

Terui

Urabe

Senzaki

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

The massive release of captive-bred native species (“intentional release”) is a pervasive method to enhance wild populations of commercial and recreational species. However, such external inputs may disrupt the sensitive species interactions that allow competing species to coexist, potentially compromising long-term community stability. Here, we use theory and long-term data of stream fish communities to show that intentional release destabilizes community dynamics with limited demographic benefit to the enhanced species. Our theory predicted that intentional release intensifies interspecific competition, facilitating the competitive exclusion of unenhanced species that otherwise stably coexist. In parallel, the excessive input of captive-bred individuals suppressed the natural recruitment of the enhanced species via intensified within-species competition. Consequently, the ecological community with the intentional release is predicted to show reduced community density with unstable temporal dynamics. Consistent with this prediction, stream fish communities showed greater temporal fluctuations and fewer taxonomic richness in rivers with the intensive release of hatchery salmon—a major fishery resource worldwide. Our findings alarm that the current overreliance on intentional release may accelerate global biodiversity loss with undesired consequences for the provisioning of ecosystem services.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Intentional release of native species undermines ecological stability

Terui

Urabe

Senzaki

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…Moreover, although vital rates can be estimated for released individuals, these values can be different for subsequent generations, which can impact the overall performance of the reintroduced population (Servanty et al . 2014, Okahisa & Nagata 2022). Finally, estimating long‐term population growth from initial trends can be misleading for new populations which may not have reached a stable age structure (Armstrong & Reynolds 2012).…”

mentioning

confidence: 98%

“…Few studies have documented vital rates from post-release monitoring data (Sutherland et al 2010, Bernardo et al 2011, especially in species with slow lifehistories, where monitoring beyond the initial release phase is required (Sarrazin 2007) to detail demographic rates and population dynamics for reintroduced populations (Robert et al 2015, Muriel et al 2021. Moreover, although vital rates can be estimated for released individuals, these values can be different for subsequent generations, which can impact the overall performance of the reintroduced population (Servanty et al 2014, Okahisa & Nagata 2022. Finally, estimating long-term population growth from initial trends can be misleading for new populations which may not have reached a stable age structure (Armstrong & Reynolds 2012).…”

mentioning

confidence: 99%

High survival promotes persistence in a reintroduced population of Common Crane (Grus grus)

Donaldson

Bridge

Hilton

2023

Ibis

View full text Add to dashboard Cite

Reintroductions are increasingly used for re‐establishing populations, though the documented success rates are variable. Success is typically measured by the survival and breeding success of released individuals and subsequent establishment and growth of the population. However, few studies quantify demographic rates of reintroduced populations of long‐lived species, with slower dynamics and lower reproductive rates, and the demographic rates of subsequent generations, which determine population growth and persistence, are often unknown. We document the success of the reintroduction of the Common Crane Grus grus to south‐west England in the UK, using survival analysis and population modelling to determine whether the overarching aim of establishing a self‐sustaining population is likely to be achieved. Between 2010 and 2014, 93 Common Cranes were hatched from wild eggs, custom‐reared and soft‐released into suitable habitat. Survival of all age‐classes was apparently higher than survival of healthy wild individuals, particularly in juvenile age‐classes, and was higher in females than in males. Productivity was relatively low, but increased with age. Assuming that the demographic rates of subsequent generations are at the levels estimated for the captive‐reared population, slow positive population growth is predicted over the next 30 years. Sensitivity analyses showed that the persistence of this population is sensitive to even a slight decrease in values of adult survival, and growth is impacted to a lesser extent by juvenile survival and levels of productivity. This study highlights the ability to achieve persistence in a reintroduced population despite low levels of productivity when survival is exceptionally high. It also illustrates the need for long‐term monitoring to establish reintroduction success in animals that have slow life histories: 9 years after initial releases, the Common Crane population remains dominated by first‐generation birds and productivity is skewed by transient age‐structure and the late onset of reproductive success.

show abstract