Dramatic recent declines in the size of monarch butterfly ( Danaus plexippus ) roosts during fall migration DOI Creative Commons
Andrew K. Davis, Jordan R. Croy, William E. Snyder

и другие.

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(43)

Опубликована: Окт. 15, 2024

The conservation status of monarch butterflies in North America is a topic intense scrutiny and debate. It clear that winter colonies Mexico are declining, yet some recent studies suggest summer breeding populations relatively stable similar to historical abundances. One possible explanation for these discordant patterns fall migration success has been recently disrupted. Here, we use unexplored citizen-scientist dataset on the size “roosts,” which resting aggregations vegetation, infer changes abundance along route over last 17 y. We found timing remained unchanged while flyway generally become warmer greener. Warmer greener conditions were associated with larger roosts, steady, dramatic declines roost sizes through time independent climate landscape factors. Roost have declined as much 80%, losses increasing from north south route. These findings failure during could explain apparent drop numbers overwintering populations. This turn suggests efforts support most needed, such providing high quality nectar plants or limiting planting nonnative milkweeds enhance parasite loads. Overall, it appears under imminent threat, even if species’ overall survival not.

Язык: Английский

Dramatic recent declines in the size of monarch butterfly ( Danaus plexippus ) roosts during fall migration DOI Creative Commons
Andrew K. Davis, Jordan R. Croy, William E. Snyder

и другие.

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(43)

Опубликована: Окт. 15, 2024

The conservation status of monarch butterflies in North America is a topic intense scrutiny and debate. It clear that winter colonies Mexico are declining, yet some recent studies suggest summer breeding populations relatively stable similar to historical abundances. One possible explanation for these discordant patterns fall migration success has been recently disrupted. Here, we use unexplored citizen-scientist dataset on the size “roosts,” which resting aggregations vegetation, infer changes abundance along route over last 17 y. We found timing remained unchanged while flyway generally become warmer greener. Warmer greener conditions were associated with larger roosts, steady, dramatic declines roost sizes through time independent climate landscape factors. Roost have declined as much 80%, losses increasing from north south route. These findings failure during could explain apparent drop numbers overwintering populations. This turn suggests efforts support most needed, such providing high quality nectar plants or limiting planting nonnative milkweeds enhance parasite loads. Overall, it appears under imminent threat, even if species’ overall survival not.

Язык: Английский

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