Abstract
Insects are in decline globally with Lepidoptera identified as one of the most impacted taxa. While declines in butterfly diversity in southern California are well documented, the effects of common habitat and climate modifications on butterfly assemblages are poorly understood. To better understand how to best monitor changes in butterfly richness and assemblage structure in southern California and examine how common habitat and climate (drought) modifications influence butterfly assemblages, we assessed data from our first six years of monthly butterfly biomonitoring efforts at the Robert J. Bernard Field Station (BFS) in eastern Los Angeles County. Monthly surveys span five habitats: (1) native sage scrub, (2) non-native grassland, (3) burned area, recovering vegetation after a 2013 fire, (4) lake, vegetation next to an artificial lake, and (5) edge habitat, which includes both sage scrub and adjacent suburban areas. Our results highlight that long-term (> 5 years) butterfly monitoring is required to inventory butterfly richness in habitat fragments in southern California and to assess differences in assemblages among habitats. At the BFS, butterfly assemblages differed markedly among the five habitat types with butterfly richness highest in native sage scrub and lowest in the non-native grassland, suggesting type-conversion has deleterious effects on regional butterfly assemblages. In contrast, drought, defined as years with < 75% of average annual rainfall, was a poor predictor of butterfly richness and assemblage structure. While drought seems to have little direct impact on butterfly assemblages, type-conversion represents a significant contemporary threat to regional butterfly assemblages and likely pollinator diversity. Our results highlight that long-term (> 5 year) butterfly monitoring is required to inventory butterfly richness and assess differences in assemblages among habitats. Further, we demonstrate that type-conversion from native sage scrub to non-native grasslands represents a significant threat to regional butterfly assemblages, and likely pollinator diversity.
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References
Alberts AC, Richman AD, Tran D, Sauvajot R, McCalvin C, Bolger DT (1993) Effects of habitat fragmentation on populations of native and exotic plants in southern California coastal scrub. In: Keely JE (ed) Interface between Ecology and Land Development in California. Southern California Academy of Science, Los Angeles
Arnold RA (1987) Decline of the endangered Palos Verdes blue butterfly in California. Biol Cons 40(3):203–217. https://doi.org/10.1016/0006-3207(87)90086-3
Bolger DT, Suarez AV, Crooks KR, Morrison SA, Case TJ (2000) Arthropods in urban habitat fragments in southern California: area, age, and edge effects. Ecol Appl 10(4):1230–1248. https://doi.org/10.1890/1051-0761(2000)010[1230:AIUHFI]2.0.CO;2
Bonebrake TC, Cooper DS (2014) A Hollywood drama of butterfly extirpation and persistence over a century of urbanization. J Insect Conserv 18:683–692. https://doi.org/10.1007/s10841-014-9675-z
Clark JS, Iverson L, Woodall CW, Allen CD, Bell DM, Bragg DC, D’Amato AW, Davis FW, Hersh MH, Ibanez I, Jackson ST, Matthews S, Pederson N, Peters M, Schwartz MW, Waring KM, Zimmermann NE (2016) The impacts of increasing drought on forest dynamics, structure, and biodiversity in the United States. Glob Change Biol 22:2329–2352. https://doi.org/10.1111/gcb.13160
Clarke KR, Gorley RN (2006) PRIMER V6: User Manual/Tutorial. Plymouth, PRIMER-E
Colwell RK, Mao CX, Chang J (2004) Interpolating, extrapolating, and comparing incidence-based species accumulation curves. Ecology 85:2717–2727. https://doi.org/10.1890/03-0557
Cox RD, Preston KL, Johnson RF, Minnich RA, Allen EB (2014) Influence of landscape-scale variables on vegetation conversion to exotic annual grassland in southern California, USA. Global Ecol Conserv 2:190–203. https://doi.org/10.1016/j.gecco.2014.09.008
Cramer JC (1998) Population growth and air quality in California. Demography 35(1):45–56. https://doi.org/10.2307/3004026
Crone EE, Pelton EM, Brown LM, Thomas CC, Schultz CB (2019) Why are monarch butterflies declining in the West? Understanding the importance of multiple correlated drivers. Ecol Appl 29(7):e01975. https://doi.org/10.1002/eap.1975
D’Antonio CM, Vitousek PM (1992) Biological invasions by exotic grasses, the grass/fire cycle, and global change. Annu Rev Ecol Evol Syst 23:63–87. https://doi.org/10.1146/annurev.es.23.110192.000431
Davenport K (2018) Butterflies of southern California in 2018: updating Emmel and Emmel’s 1973 Butterflies of southern California. Chapter 15 in Lepidoptera of North America. C.P. Gillette Museum of Arthropod Diversity Colorado State University. Fort Collins, CO. https://mountainscholar.org/handle/10217/187314. Accessed 27 December 2021
Diffenbaugh NS, Swain DL, Touma D (2015) Anthropogenic warming has increased drought risk in California. Proc Natl Acad Sci 112(13):3931–3936. https://doi.org/10.1073/pnas.1422385112
Ehrlich PR, Murphy DD, Singer MC, Sherwood CB, White RR, Brown IL (1980) Extinction, reduction, stability and increase: The responses of checkerspot butterfly (Euphydryas) populations to the California drought. Oecologia 46(1):101–105. https://doi.org/10.1007/BF00346973
Eliason SA, Allen EB (1997) Exotic grass competition in suppressing native shrubland re-establishment. Restor Ecol 5(3):245–255. https://doi.org/10.1046/j.1526-100X.1997.09729.x
Erhardt A, Thomas JA (1991) Lepidoptera as indicators of change in the semi-natural grasslands of lowland and upland Europe. In: Collins NM, Thomas J (eds) The conservation of insects and their habitats. Harcourt Brace Jovanovich, London, pp 213–234
Fenoglio MS, Rossetti MR, Videla M (2020) Negative effects of urbanization on terrestrial arthropod communities: a meta-analysis. Glob Ecol Biogeogr 29(8):1412–1429. https://doi.org/10.1111/geb.13107
Forister ML, Cousens B, Harrison JG, Anderson K, Thorne JH, Waetjen D, Nice CC, De Parsia M, Hladik ML, Meese R, van Vliet H, Shapiro AM (2016) Increasing neonicotinoid use and the declining butterfly fauna of lowland California. Biol Let 12(8):20160475. https://doi.org/10.1098/rsbl.2016.0475
Forister ML, Fordyce JA, Nice CC, Thorne JH, Waetjen DP, Shapiro M (2018) Impacts of a millennium drought on butterfly faunal dynamics. Climate Change Respons 5:3. https://doi.org/10.1186/s40665-018-0039-x
Forister ML, Halsch CA, Nice CC, Fordyce JA, Dilts TE, Oliver JC, Prudic KL, Shapiro AM, Wilson JK, Glassberg J (2021) Fewer butterflies seen by community scientists across the warming and drying landscapes of the American West. Science 371(6533):1042–1045. https://doi.org/10.1126/science.abe5585
Graves SD, Shapiro AM (2003) Exotics as host plants of the California butterfly fauna. Biol Cons 110(3):413–433. https://doi.org/10.1016/S0006-3207(02)00233-1
Griffin D, Anchukaitis KJ (2014) How unusual is the 2012–2014 California drought? Geophys Res Lett 41(24):9017–9023. https://doi.org/10.1002/2014GL062433
Hallmann CA, Sorg M, Jongejans E, Siepel H, Hofland N, Schwan H, Stenmans W, Müller A, Sumser H, Hörren T, Goulson D, de Kroon H (2017) More than 75 percent decline over 27 years in total flying insect biomass in protected areas. PLoS ONE 12(10):e0185809. https://doi.org/10.1371/journal.pone.0185809
Halsch CA, Shapiro AM, Thorne JH, Waetjen DP, Forister ML (2020) A winner in the Anthropocene: changing host plant distribution explains geographical range expansion in the gulf fritillary butterfly. Ecological Entomology 45(3):652–662. https://doi.org/10.1111/een.12845
Heath F (2004) An introduction to Southern California butterflies. Mountain Press Publishing Company, Missoula
Hilbig B (2015) Ecological assembly rules and soil legacy effects in the restoration of an invaded plant community. Dissertation, University of California Riverside
Holway DA, Suarez AV, Case TJ (2002) Role of abiotic factors in governing susceptibility to invasion: a test with Argentine ants. Ecology 83(6):1610–1619. https://doi.org/10.1890/0012-9658(2002)083[1610:ROAFIG]2.0.CO;2
Hung K-LJ, Ascher JS, Gibbs J, Irwin RE, Bolger DT (2015) Effects of fragmentation on a distinctive coastal sage scrub bee fauna revealed through incidental captures by pitfall traps. J Insect Conserv 19(1):175–179. https://doi.org/10.1007/s10841-015-9763-8
Hung K-LJ, Ascher JS, Holway DA (2017) Urbanization-induced habitat fragmentation erodes multiple components of temporal diversity in a Southern California native bee assemblage. PLoS ONE 12(8):e0184136. https://doi.org/10.1371/journal.pone.0184136
Johansson V, Kindvall O, Askling J, Franzén M (2020) Extreme weather affects colonization–extinction dynamics and the persistence of a threatened butterfly. J Appl Ecol 57(6):1068–1077. https://doi.org/10.1111/1365-2664.13611
Keeley JE (2005) Fire as a threat to biodiversity in fire-type shrublands. Proceedings of the conference, planning for biodiversity: bringing research and management together. USDA Forest Service, Pacific Southwest Research Station, General Technical Report PSW-GTR-195.
Keeley JE, Syphard AD (2018) Historical patterns of wildfire ignition sources in California ecosystems. Int J Wildland Fire 27(12):781–799. https://doi.org/10.1071/WF18026
Klockmann M, Fischer K (2017) Effects of temperature and drought on early life stages in three species of butterflies: Mortality of early life stages as a key determinant of vulnerability to climate change? Ecol Evol 7(24):10871–10879. https://doi.org/10.1002/ece3.3588
Mahall B, Thwing L, Tyler C (2010) A quantitative comparison of two extremes in chaparral shrub phenology. Flora – Morphol Distribut Funct Ecol Plants 205(8):513–526. https://doi.org/10.1016/j.flora.2009.12.011
Mattoni R, Angulo A, Burnam J, Chalekian J, Chen J, Cortez N, Duvernay E, Farris C, Fry D, Hill R, Hillway K, Post A, Pun K, Scholnick J, Sway D, Varvel A, Wilson G, Yancey C (1997) Biological assessment: coastal sage scrub at University of California, Los Angeles. UCLA Department of Geography. http://www.sscnet.ucla.edu/geog/sagehill/_Media/_IMG/species/UCLA_CoastalSageHCP.pdf Accessed 14 December 2021
Mattoni R, Longcore T, Zonneveld C, Novotny V (2001) Analysis of transect counts to monitor population size in endangered insects the case of the El Segundo blue butterfly, Euphilotes Bernardino Allyni. J Insect Conserv 5:197–206. https://doi.org/10.1023/A:1017987929824
Meyer WM III, Eble JA, Franklin K, McManus RB, Brantley SL, Henkel J, Marek PE, Hall WE, Olson CA, McInroy R, Bernal Loaiza EM (2015) Ground-dwelling arthropod communities of a sky island mountain range in southeastern Arizona, USA: obtaining a baseline for assessing the effects of climate change. PLoS ONE 10(9):e0135210. https://doi.org/10.1371/journal.pone.0135210
Montgomery GA, Dunn RR, Fox R, Jongejans E, Leather SR, Saunders ME, Shortall CR, Tingley MW, Wagner DL (2020) Is the insect apocalypse upon us? How to Find out. Biol Conserv 241:108327. https://doi.org/10.1016/j.biocon.2019.108327
Opler PA, Wright AB (1999) Peterson field guide to western butterflies. Houghton Mifflin, Boston
Pfeiler E, Jump PM (2010) Historical records of the butterfly fauna at a coastal sage scrub site in southern California, USA. J Lepid Soc 64(4):211–215. https://doi.org/10.18473/lepi.v64i4.a6
Prugh LR, Deguines N, Grinath JB, Suding KN, Bean WT, Stafford R, Brashares JS (2018) Ecological winners and losers of extreme drought in California. Nat Clim Chang 8(9):819–824. https://doi.org/10.1038/s41558-018-0255-1
Riordan EC, Rundel PW (2009) Modelling the distribution of a threatened habitat: the California sage scrub. J Biogeogr 36(11):2176–2188. https://doi.org/10.1111/j.1365-2699.2009.02151.x
Riordan EC, Rundel PW (2014) Land use compounds habitat losses under projected climate change in a threatened California ecosystem. PLoS ONE 9(1):e86487. https://doi.org/10.1371/journal.pone.0086487
Rubinoff D (2001) Evaluating the California gnatcatcher as an umbrella species for conservation of southern California coastal sage scrub. Conserv Biol 15(5):1374–1383. https://doi.org/10.1111/j.1523-1739.2001.00176.x
Rundel P (2007) Sage scrub. In: Barbour M, Keeler-Wolf T, Schoenherr AA (eds) Terrestrial vegetation of California, 3rd edn. University of California Press, Oakland, pp 208–228
Sánchez-Bayo F, Wyckhuys KAG (2019) Worldwide decline of the entomofauna: a review of its drivers. Biol Cons 232:8–27. https://doi.org/10.1016/j.biocon.2019.01.020
Schonher T, Nicholson SE (1989) The relationship between California rainfall and ENSO events. J Clim 2(11):1258–1269. https://doi.org/10.1175/1520-0442(1989)002%3c1258:TRBCRA%3e2.0.CO;2
Shapiro AM (2002) The Californian urban butterfly fauna is dependent on alien plants. Divers Distrib 8(1):31–40. https://doi.org/10.1046/j.1366-9516.2001.00120.x
Soule ME, Bolger DT, Alberts AC, Wright J, Sorice M, Hill S (1988) Reconstructed dynamics of rapid extinctions of chaparral-requiring birds in urban habitat islands. Conserv Biol 2(1):75–92. https://doi.org/10.1111/j.1523-1739.1988.tb00337.x
Spear DM, Adams TA, Boyd ES, Dipman MM, Staubus WJ, Meyer WM III (2017) The effects of development, vegetation-type conversion, and fire on low-elevation Southern California spider assemblages. Invertebr Biol 163(2):134–145. https://doi.org/10.1111/ivb.12163
Staubus WJ, Boyd ES, Adams TA, Spear DM, Dipman MM, Meyer WM III (2015) Ant communities in native sage scrub, non-native grassland, and suburban habitats in Los Angeles County, USA: Conservation implications. J Insect Conserv 19(4):669–680. https://doi.org/10.1007/s10841-015-9790-5
Staubus W, Bird S, Meadors S, Meyer WM III (2019) Distributions of invasive arthropods across heterogeneous urban landscapes in Southern California: aridity as a key component of ecological resistance. Insects 10(1):29. https://doi.org/10.3390/insects10010029
Suarez AV, Bolger DT, Case TJ (1998) Effects of fragmentation and invasion on native ant communities in coastal southern California. Ecology 79(6):2041–2056. https://doi.org/10.1890/0012-9658(1998)079[2041:EOFAIO]2.0.CO;2
Talluto MV, Suding KN (2008) Historical change in coastal sage scrub in southern California, USA in relation to fire frequency and air pollution. Landsc Ecol 23(7):803–815. https://doi.org/10.1007/s10980-008-9238-3
Thomson DM, Kwok JW, Schultz EL (2018) Extreme drought alters growth and interactions with exotic grasses, but not survival, for a California annual forb. Plant Ecol 219(6):705–717. https://doi.org/10.1007/s11258-018-0828-0
Thomson DM, Bonapart AD, King RA, Schultz EL, Startin CR (2020) Long-term monitoring of a highly invaded annual grassland community through drought, before and after an unintentional fire. J Veg Sci 31(2):307–318. https://doi.org/10.1111/jvs.12833
Thomson DM, Meyer WM III, Whitcomb IF (2021) Non-native plant removal and high rainfall years promote post-fire recovery of Artemisia californica in southern California sage scrub. PLoS ONE. https://doi.org/10.1371/journal.pone.0254398
Underwood EC, Viers JH, Klausmeyer KR, Cox RL, Shaw MR (2009) Threats and biodiversity in the Mediterranean biome. Divers Distrib 15:188–197. https://doi.org/10.1111/j.1472-4642.2008.00518.x
Westman WE (1981) Diversity relations and succession in Californian coastal sage scrub. Ecology 62(1):170–184. https://doi.org/10.2307/1936680
Wilhite DA (1993) The enigma of drought. In: Wilhite DA (ed) Drought assessment, management, and planning: theory and case studies, vol 2. Springer, New York, pp 3–15
Wolkovich EM, Bolger DT, Holway DA (2009) Complex responses to invasive grass litter by ground arthropods in a Mediterranean scrub ecosystem. Oecologia 161(4):697–708. https://doi.org/10.1007/s00442-009-1425-7
Acknowledgements
This project was made possible with funding provided by Jean Shultz and the Robert J. Bernard Field Station. All surveys were conducted with permission from the Claremont Colleges’ Robert J. Bernard Field Station. Early funding for developing the survey protocols was provided by the National Science Foundation (DBI-1318924 to W.M. Meyer). We also thank Jonathan Wright, Bill Gendron, Steve Nagler, Richard Haskell, and Carol Hamlett who assisted with the butterfly surveys. In addition, we thank Diane Thomson for help identifying and obtaining rainfall data.
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WMMIII and PRISSM members (www.prissm.org) designed the project; NH and volunteers collected the data; NH curated the raw data and SD curated the data matrices; WMMIII and SD ran statistical analyses; SD was the primary author; WMMIII, NH, and SD revised and approved the final version of the manuscript.
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No butterflies were collected or harmed during this experiment. IDs were done using photographs taken by surveyors or IDs made in the field. Access to survey sites were granted by the Claremont Colleges’ Robert J. Bernard Field Station.
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Dartnell, S., Hamlett, N. & Meyer, W.M. Monitoring butterfly assemblages in southern California to assess the impact of habitat and climate modifications. J Insect Conserv 26, 149–162 (2022). https://doi.org/10.1007/s10841-022-00371-w
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DOI: https://doi.org/10.1007/s10841-022-00371-w