Influence of roadkill during breeding migration on the sex ratio of land crab (Sesarma haematoche)

Ryu, Mi; Kim, Jae Geun

doi:10.1186/s41610-020-00167-6

Cited by 6 publications

(8 citation statements)

References 25 publications

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“…This result can be explained by the fact that female crabs were disproportionately roadkilled during breeding migration. Importantly, as the crab body size increased, the proportion of females decreased significantly 57 . However, sex ratios of adult land crab were not biased in uninhabited islands 57 .…”

Section: Discussionmentioning

confidence: 99%

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Coastal road mortality of land crab during spawning migration

Ryu

Kim

2021

Sci Rep

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Land crabs are threatened by ocean sprawl even though they act as keystone consumers in coastal forest. Female land crabs must migrate to the sea annually to release larvae. However, they face the risk of road mortality which reduces ecological connectivity. We investigated the spawning migration rhythm and the roadkill of land crab. Migrating crabs and roadkilled crabs were recorded on coastal roads in South Korea from July 28 to August 27 in 2018. Female land crabs mainly released zoeae during spring tide. The number of roadkilled crabs also synchronized with migration peak. A majority (95%) of 739 roadkilled carcasses were female crabs. As a result, the female crabs accounted only 29.6% of the population which can lead to a population decline. The roadkill density was the highest in a residential area without cement guardrails. These results suggest the mitigation actions for land crab roadkill. Among them, prohibiting vehicular traffic between sunset and midnight during spring tides in the breeding season should increase the viability of the population.

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Section: Discussionmentioning

confidence: 99%

“…Importantly, as the crab body size increased, the proportion of females decreased significantly 57 . However, sex ratios of adult land crab were not biased in uninhabited islands 57 . As a result, significant male-biased sex ratios of land crab in this study are attributed to female skewed road mortality during spawning migration.…”

Section: Discussionmentioning

confidence: 99%

Coastal road mortality of land crab during spawning migration

Ryu

Kim

2021

Sci Rep

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“…The resulting BCRW simulated a migration of individuals between patches during which they had no choice but to cross the road. This scenario could match many migrating species such as amphibians converging towards open waters for reproduction (Hels & Buchwald, 2001; Sillero, 2008), large mammals migrating to their summer or winter ranges (Avgar et al ., 2014) and crab species moving back to sea during breeding migrations (Ryu & Kim, 2020).…”

Section: Methodsmentioning

confidence: 99%

“…CC-BY-NC 4.0 International license available under a (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made during breeding migrations (Ryu & Kim, 2020).…”

Section: Scenario 1: Habitat Fragmentationmentioning

confidence: 99%

A biologically realistic model to predict wildlife-vehicle collision risks

Bénard

Lengagne

Bonenfant

2023

Preprint

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Road networks have major ecological impacts on living organisms consequent to habitat loss and fragmentation, chemical and acoustic pollution, and direct mortality when wildlife-vehicle collisions are involved (WVC). The many past empirical studies revealed biological traits shared by species most vulnerable to roadkills (e.g. population density). Similarly, spatial locations of WVC hot-spots are associated to landscape features at large spatial scales, and to road characteristics at small spatial scale. We currently lack a comprehensive theoretical framework for WVC. Animal movement in relation to habitats is an essential driver of encounters with roads, but this remains largely ignored in studies, even when movement ecology provides the necessary tools to investigate the impact of animal movement on WVC. We built a general individual-based model incorporating recent knowledge in movement ecology (movement typology: roaming, migratory route crossing a road, active attraction and active repulsion of roads) to estimate WVC risks. We explored the relative effects of animal and vehicle movement parameters (speed,abundance, road sinuosity and animal movement pattern) on collision probability; We show that animal behaviour toward roads has major impacts on the number and risks of WVC, but also modulate the effects of other factors (animal traveling speed, species local abundance, road traffic volume) on WVC. Sensitivity analyses show that the movement and behaviour of the animal has more influence on WVC risks than any of the characteristics of roads and vehicles we tested. Our results suggest that (1) effective roadkill mitigation should be species-specific and could vary in efficiency depending on the target's movement pattern (mating and migratory seasons, foraging habits. . . ) and (2) empirical studies of WVC should incorporate knowledge about the behavioural habits of the focal species in relation to roads.

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“…A study with three different species of freshwater turtles demonstrated more fatalities involving females, due to their seasonal nesting movements along roads (Aresco, 2005). Roadkill rates concentrated in a specific gender can affect demographic structure and influence population dynamics over time (Beaudry et al, 2010; Ryu & Kim, 2020).…”

Section: Introductionmentioning

confidence: 99%

Road mortality in the blue‐black grassquit (Volatinia jacarina) is seasonally driven and sex‐biased

et al. 2023

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Roads are responsible for different negative effects on wildlife, including the isolation of populations and the direct reduction of biodiversity. Millions of animals are killed in traffic every year. Despite that, the influence of animal behaviour on the probability of animal‐vehicle collisions has been overlooked by the literature. The blue‐black grassquit (Volatinia jacarina) is a small, migratory, dichromatic species. During the breeding period, males vigorously defend small, clustered territories. Here, we investigated how the number of roadkills varied spatially and temporally in relation to the breeding activity, density, and sex of grassquits. We demonstrated that the variation in the movement dynamics and reproductive behaviour of the grassquits are associated with a great number of casualties. Road mortality is higher during the breeding period but is not associated with juvenile dispersion. As expected, males have a higher probability of being road‐killed than females, suggesting that territory defence and mate searching may increase the risk of mortality. On the other hand, the clustering of individuals may not increase the risk of road fatalities, suggesting that other environmental attributes may influence the probability of being killed on roads.

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Influence of roadkill during breeding migration on the sex ratio of land crab (Sesarma haematoche)

Cited by 6 publications

References 25 publications

Coastal road mortality of land crab during spawning migration

Coastal road mortality of land crab during spawning migration

A biologically realistic model to predict wildlife-vehicle collision risks

Road mortality in the blue‐black grassquit (Volatinia jacarina) is seasonally driven and sex‐biased

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