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The Hummingbird and the Hawk-Moth: Species Distribution, Geographical

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The Hummingbird and the Hawk-Moth: Species Distribution, Geographical bioRxiv preprint doi: https://doi.org/10.1101/212894; this version posted November 2, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.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 available under aCC-BY-NC-ND 4.0 International license. 1 The hummingbird and the hawk-moth: species distribution, geographical partitioning, and 2 macrocompetition across the United States 3 4 5 Abdel Halloway1, Christopher J. Whelan1, and Joel S. Brown2 6 7 8 9 1Department of Biological Sciences, University of Illinois at Chicago 10 845 W. Taylor St. (M/C 066) Chicago, IL 60607 11 12 2Integrated Mathematical Oncology, Moffitt Cancer Center 13 SRB-4, 12902 USF Magnolia Drive Tampa, FL 33612 14 15 Corresponding Author 16 Abdel Halloway 17 Department of Biological Sciences, University of Illinois at Chicago 18 845 W. Taylor St. (M/C 066) Chicago, IL 60607 19 [email protected] 20 21 22 Keywords 23 Biogeography, Competition, Hawk-moth, Hummingbird, Niche Partitioning, Sphingidae, 24 Trochilidae, United States 25 bioRxiv preprint doi: https://doi.org/10.1101/212894; this version posted November 2, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.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 available under aCC-BY-NC-ND 4.0 International license. 26 ABSTRACT 27 Macrocompetition –higher taxa suppressing species richness and adaptive radiation of 28 others – exists as a potentially intriguing possibility. We investigate possible evidence for this 29 phenomenon occurring between two convergent nectarivorous families, the hawk-moths 30 (Sphingidae) and hummingbirds (Trochilidae) by searching for geographical partitioning over 31 the continental United States. Using stepwise regression, we tested for latitudinal and 32 longitudinal biases in the species richness (S) of both taxa and the potential role of 10 33 environmental variables in their distribution pattern. Hawk-moth species richness increases with 34 longitude (eastward-bias) while that of hummingbirds declines (westward-bias). Hawk-moth 35 species richness is positively correlated with higher temperatures overall (especially summer 36 minimums), atmospheric pressure, and summer precipitation; hummingbird species richness is 37 negatively correlated with atmospheric pressure and positively correlated with winter daily 38 maximums. Overall, hawk-moth and hummingbird species richness patterns support the 39 operation of macrocompetition and large scale niche partitioning between the two taxa. Hawk- 40 moth species richness was highest in states with low elevation, summer-time flowering and 41 warm summer nights. Hummingbird species richness is highest in the southwest with higher 42 elevation, more cool season flowering and high daytime winter temperatures. Similar geographic 43 patterning can be seen across the Canada and South America. With this analysis, we see 44 macrocompetition potentially occurring between these two families as two of three of Brown and 45 Davidson (1979) indicators for – niche overlap and geographical partitioning are strongly 46 suggested. We hope that our study helps to further exploration into a potentially undescribed 47 form of competition and the understudied relationship between hawkmoths and hummingbirds. bioRxiv preprint doi: https://doi.org/10.1101/212894; this version posted November 2, 2017. The copyright holder for this preprint (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 available under aCC-BY-NC-ND 4.0 International license. 48 INTRODUCTION 49 Of the three main direct ecological interactions – competition, predation, and mutualism – 50 competition is believed to be the most important of the three, accounting for the distribution 51 (Hutchinson 1978), origination (Rosenzweig 1978; Hutchinson 1978; Schluter 2000; Ripa et al. 52 2009) and extinction of species (Gause 1934). Competition is known to affect small-scale 53 interactions among species and also drives larger scale phenomena. Incumbent replacement… 54 and even various hypotheses on speciation have competition at their core (Rosenzweig and 55 McCord, 1991; Rosenzweig, 1978). Competition is often studied at the local scale, either 56 between individuals within a population mutually suppressing fitness or between populations 57 mutually suppressing population size. Competition may also exist at higher taxonomic levels; if a 58 taxonomic group occupies potential niche space for another taxonomic group, it can prevent an 59 adaptive radiation of the latter. In this form of competition, species richness itself is suppressed 60 rather than fitness or population size. One can think of competition acting on three levels: 61 microcompetition which occurs between individuals and acts on fitness, mesocompetition which 62 occurs between populations and suppresses population size, and macrocompetition which occurs 63 between higher order taxa and suppresses species richness. 64 Bearing in mind that macrocompetition occurs on different scales from micro- and 65 mesocompetition, both temporal and geographic scales are key. Because macrocompetition 66 suppresses species diversity and the radiation of taxonomic groups, macrocompetition must 67 occur over large geographic scales and at taxonomic levels higher than the species. Because of 68 this link between spatial, temporal, and organizational scales, macrocompetition must be studied 69 at its own appropriate scale. Just as population level mesocompetition is not studied by 70 aggregating individual microcompetitive interactions, macrocompetition cannot be studied bioRxiv preprint doi: https://doi.org/10.1101/212894; this version posted November 2, 2017. The copyright holder for this preprint (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 available under aCC-BY-NC-ND 4.0 International license. 71 through the aggregation of mesocompetitive and microcompetitive interactions. 72 A strong analogy can be seen in the field of economics. Two worldviews compete in 73 macroeconomics: microfoundations, in which individual microeconomic interactions are 74 analyzed and then aggregated to understand macroeconomic properties, and the classical 75 aggregate demand--aggregate supply (AD-AS) approach which, as its name suggests, first 76 aggregates the actors into types (home, business, government, etc.) and then studies the 77 interactions among the aggregates. Of these two approaches, AD-AS has arguably yielded the 78 best knowledge in the field compared to microfoundations due to the different scales at which 79 macroeconomics and microeconomics work. As an example, the overall dynamics of the laptop 80 market have less to do with competition between, say, HP and Dell, or even competition between 81 HP and the iPad, and more to do with consumer preferences towards the laptop, tablet, and 82 smartphone markets as a whole. In the same way, when studying macrocompetition, the shared 83 characteristics within each clade and how they affect each clade’s ability to exploit various 84 environments is what’s most important – not the particuliarities of each species within the clades. 85 Key to the study of macrocompetition must is how different taxonomic groups interact 86 with each other. Mesocompetition between populations of different taxa has been well- 87 documented. Examples include tadpoles and aquatic insects (Morin et al., 1988) and insect 88 larvae (Mokany and Shine, 2003), granivorous rodents and ants (Brown and Davidson, 1977), 89 granivorous birds and rodents (Brown et al., 1997), frugivorous birds and bats (Palmeirim et al., 90 1989), insectivorous lizards and birds (Wright, 1980), and insectivorous birds and ants (Haeming 91 1994, Jedlicka et al. 2006). Competition may even exist between species of separate phyla, such 92 as the competition between scavenging vertebrates and microbes for detritus (Janzen, 1977; 93 Shivik 2006) or vertebrates and fungi for rotting fruit (Cipollini and Stiles 1993; Cipollini and bioRxiv preprint doi: https://doi.org/10.1101/212894; this version posted November 2, 2017. The copyright holder for this preprint (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 available under aCC-BY-NC-ND 4.0 International license. 94 Levey 1997). Brown and Davidson (1977) identified three key indicators to determine potential 95 intertaxonomic mesocompetition: 1) reciprocal increases in population size when competing 96 species are excluded, 2) shared extensive use of the same particular resource, and 3) partitioning 97 along a geographic or climatic gradient. Having these three criteria met strongly indicate the 98 possibility for inter-taxanomic competition at the mesocompetitive scale. We should expect the 99 same three indicators to be strong signals of macrocompetition with key modifications. Adapting 100 Brown and Davidson’s indicators for a macrocompetitive framework, the three indicators 101 become 1) reciprocal increases in species richness and adaptive radiation when competing taxa 102 are excluded, 2) shared extensive use of the same class of resources, and 3) partitioning along 103 geographical and climatic gradients across the shared taxa’s range. 104 Pollination
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