The decline of native coccinellids (Coleoptera: Coccinellidae) in the United States and Canada

Harmon, Jason P.; Stephens, Erin; Losey, John E.

doi:10.1007/s10841-006-9021-1

Cited by 127 publications

(73 citation statements)

References 38 publications

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“…Over the past century, C. novemnotata is thought to have been much more abundant previously than in recent years in many parts of North America (Gordon, 1985;Wheeler and Hoebeke, 1995;Harmon et al, 2007;Hesler and Kieckhefer, 2008;Fothergill and Tindall, 2010;Diepenbrock et al, 2016). One published record for Utah in particular indicates that under some circumstances, adults of C. novemnotata occurred at much higher abundance than documented here for the recent past (i.e., from the late 1980s to the present).…”

Section: Discussionmentioning

confidence: 56%

“…The coincidence in timing of the rapid increase in abundance of the exotic lady beetle C. septempunctata with the dramatic decrease in abundance of the formerly widespread native species C. novemnotata during the late 1900s, coupled with the seemingly strong niche overlap between the two species, suggested competitive displacement as one possible cause for the change in population status of C. novemnotata in northeastern North America (Wheeler and Hoebeke, 1995;Harmon et al, 2007;Tumminello et al, 2015). In addition or alternatively, this change may have resulted also from other factors, such as changing patterns of land use, climate change, changes in prey abundance (e.g., aphids in crops), and disease (Wheeler and Hoebeke, 1995;Day and Tatman, 2006;Harmon et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…In addition or alternatively, this change may have resulted also from other factors, such as changing patterns of land use, climate change, changes in prey abundance (e.g., aphids in crops), and disease (Wheeler and Hoebeke, 1995;Day and Tatman, 2006;Harmon et al, 2007). It is important therefore to consider also patterns in population status of C. novemnotata in other regions of North America as C. septempunctata has become well-established in these regions as well (Fothergill and Tindall, 2010;Bartlett et al, 2015;Diepenbrock et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Ladybird beetles (Coleoptera: Coccinellidae) have often been introduced to new geographic regions for biological control, and some have become invasive (Harmon et al, 2007;Evans et al, 2011). Evaluation of impact on native relatives from worldwide species introductions of these predators illustrates the general issues surrounding the interactions of invasive and native species.…”

Section: Introductionmentioning

confidence: 99%

“…The coinciding of declining abundance of C. novemnotata with increasing abundance of C. septempunctata in eastern and midwestern North America suggested that rise of the latter might be responsible for demise of the former, but both Wheeler and Hoebeke (1995) and Harmon et al (2007) cautioned that decline in C. novemnotata abundance may have resulted from other causes such as changing land use or disease. The importance of alternative causes received support from subsequent documentation that C. novemnotata's steep decline in Missouri occurred well before C. septempunctata arrived (Fothergill and Tindall, 2010;Diepenbrock et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Fates of Rare Species under Siege from Invasion: Persistence of Coccinella novemnotata Herbst in Western North America alongside an Invasive Congener

Evans

2017

Front. Ecol. Evol.

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Species invading new geographic regions may threaten continued existence of similar, indigenous relatives, particularly those species whose rarity may reflect an already tenuous existence. The spectacular colonization of North America in recent decades by Coccinella septempunctata L. has generated widespread concern over potentially adverse effects on population viability of native species of ladybird beetles (Coccinellidae). Coccinella novemnotata Herbst in particular has been hypothesized to be at great risk, as this species apparently dwindled in numbers across much of North America during the twentieth century. Here results of sampling diverse habitats over three decades are examined to address the fate of C. novemnotata in the intermountain region of western North America following the establishment of C. septempunctata during the 1990s. Alfalfa fields have served as a major habitat for C. novemnotata in the intermountain west. Sweep sampling in the late 1980s and early 1990s demonstated that C. novemnotata and C. septempunctata were both rare members of the alfalfa lady beetle community. Subsequent sampling in alfalfa over the next two decades revealed that populations of C. septempunctata increased greatly, while populations of C. novemnotata remained low but persistent. Similarly, modest numbers of C. novemnotata were found continuing to persist, often alongside large numbers of C. septempunctata, in a variety of other habitats, including sagebrush steppe and weed-infested rangeland and riparian sites. Morphological comparison of these individuals of C. novemnotata with museum specimens collected throughout the twentieth century revealed no significant difference in mean body size between these recently and previously collected individuals, nor any significant long-term decrease in body size following the arrival of C. septempunctata, as might reflect increasing food limitation for larval C. novemnotata. Collectively these results indicate that even in the face of invasion by a dominant competitor, C. novemnotata has maintained an ecological foothold in the intermountain west of North America, occurring in diverse habitats including both those supporting low and high numbers of the invader. The availability of these diverse habitats across a heterogeneous landscape may promote persistence less tenuous, even as confronted with invasion, than the low abundance of C. novemnotata alone might suggest.

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Section: Discussionmentioning

confidence: 56%