2020
DOI: 10.3389/fevo.2020.00264
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Evaluating the Migration Mortality Hypothesis Using Monarch Tagging Data

Abstract: The decline in the eastern North American population of the monarch butterfly population since the late 1990s has been attributed to the loss of milkweed during the summer breeding season and the consequent reduction in the size of the summer population that migrates to central Mexico to overwinter (milkweed limitation hypothesis). However, in some studies the size of the summer population was not found to decline and was not correlated with the size of the overwintering population. The authors of these studie… Show more

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Cited by 32 publications
(47 citation statements)
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“…These recovery rates are similar to those reported for 2012–2016 [ 13 ]. They are also within the range reported for Arizona [ 11 ] and eastern US monarchs [ 33 ]. However, it is likely that the recovery rate for eastern US monarchs is an underestimate because it only uses individuals found dead at the Mexico overwintering sites [ 33 ].…”
Section: Discussionsupporting
confidence: 88%
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“…These recovery rates are similar to those reported for 2012–2016 [ 13 ]. They are also within the range reported for Arizona [ 11 ] and eastern US monarchs [ 33 ]. However, it is likely that the recovery rate for eastern US monarchs is an underestimate because it only uses individuals found dead at the Mexico overwintering sites [ 33 ].…”
Section: Discussionsupporting
confidence: 88%
“…They are also within the range reported for Arizona [ 11 ] and eastern US monarchs [ 33 ]. However, it is likely that the recovery rate for eastern US monarchs is an underestimate because it only uses individuals found dead at the Mexico overwintering sites [ 33 ]. If live tagged butterflies were counted in Mexico, the recovery rate would likely be much higher.…”
Section: Discussionsupporting
confidence: 88%
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“…Thus, the possibility was raised that the fall migration to Mexico and overwintering period might be a weak link in the migratory life cycle, which would, in turn, suggest conservation attention should not be focused too narrowly on summer milkweed resources. Taylor et al (2020) present new tagging data, concluding that none of the expectations of the migration mortality hypothesis are supported. They conclude the following: (1) the apparent disconnect between late summer and overwintering numbers reflects poor summer data used in previous analyses, (2) the recovery rate (equated with migration success) of tagged monarchs is not correlated with overwintering numbers, and (3) recovery rate has not decreased over time.…”
mentioning
confidence: 78%
“…Thus, details of the monarch decline matter: unlike many insects, it is a species for which we might hope to identify causes of decline. It is in this spirit that we offer a reconsideration of the data presented by Taylor et al (2020) who tested hypotheses pertaining to eastern monarch population decline.…”
mentioning
confidence: 99%