Relationship of Larval Food-plants and Voltinism Patterns in Temperate Butterflies.
Psyche 81:243-253, 1974.
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RELATIONSHIP OF LARVAL FOOD-PLANTS
AND VOLTINISM PATTERNS IN
BY FRANK SLANSKY, JR.**
Department of Entomology, Cornell University Ithaca, New York 14850
An interesting aspect of phenology is the number of broods that a species produces in the growing season. Even among a fairly uniform group like the butterflies within a restricted geographical area, voltin- ism patterns of the different species may vary considerably. Explana- tions of possible causes of, and ecological implications of these pat- terns have apparently seldom' been attempted. It might be expected that voltinism patterns are often genetically determined and are regulated by some environmental clue (cf. Wig- glesworth, 1967), bur knowing the proximate reason does not reveal the ultimate causes that brought the voltinism patterns under such control. Obviously, the presence of a food source for the larvae (and, although less well studied, for the adults as well) will have a major influence on these patterns. The exclusive use of the vernal herb Dentaria by larvae of the West Virginia white, Pieris virginiensis, precludes any more than one brood per season. As an adaptation to feeding on this ephemeral food-plant, the larvae upon entering the pupal stage undergo obligate diapause, even though the genetic mechanism for multivoltinism exists in this species (Shapiro, 1971)- A more subtle explanation of voltinism patterns may emerge from examining larval growth rates on different plants (e.g. Dowdeswell & Willcox, 1961 ; Hovanitz & Chang, 1962 ; Sharifi & Zarea, 1970). Nutritional (including water) differences (Soo Hoo & Fraenkel, 1966; Waldbauer, 1968; Feeny, 1970; J. M. Scriber and P. P. Feeny, nls. in prep.; Slansky, 1974) and differences in secondary chemical content (Gupta & Thorsteinson, 1960; Nayar & Thorstein- son, 1963; Feeny, 1970) of different plant species and of the same plant species at different stages of growth in large part determine the growth rates of larvae feeding on the plants, and thus perhaps for -
*This work was supported by Hatch Grant NYC-139413 and NSF Grant GB-33398.
-Present address: Department of Zoology, University of Iowa, Iowa City, Iowa 52242.
Manuscript received by the editor April 12, 1974.
244 Psyche t June
some species, voltinism patterns as well. The purpose for this work is to examine the hypothesis that, of the butterflies in particular climatically similar areas, those which have larval food-plants that are apparently nutritionally unsuitable for much of the growing sea- son will exhibit in general fewer broods per season than those butter- flies which have larval food-plants that are apparently nutritionally adequate throughout the season.
In order to examine the hypothesis the number of broods produced per year by, and the larval food-plants of, eighty-six species of but- terflies were tabulated for three transition zone areas in eastern and mid-western United States (Forbes, 1906; Saunders, 1932 ; Ebner, I 970). Additional food-plant records were obtained from Ehrlich and Ehrlich ( I 961 ) and Shapiro ( I 966). The voltinism patterns of selected species of these butterflies were then related to changes in the nutritional suitability of their larval food-plants. That differences in larval growth rates are reflected in the voltin- ism patterns of butterflies is seen in the following example. Under
similar temperature and humidity conditions the duration of the larval stage of the imported cabbageworm, Pieris rapae, is about 15 to 20 days on some of its food-plants (Slansky, 1g74), while that of the Eastern tiger swallowtail, Papilio glaucus, is about 35 to 45 days on some of its food-plants (J. M. Scriber, unpublished data). As a consequence, P. rapae generally exhibits one brood more than P. glaucus in the areas where they occur together (Table I ) .* Further support for the hypothesis is found when the voltinism patterns of selected butterfly species are examined in relation to sea- sonal changes in the nutritional suitability of larval food-plants. For example, species whose larvae feed on oaks (Quercus), such as the hairstreaks Satyrium edwardsil, S. liparops, and S. calanus, and the skippers Erynnis brizo, E. horatius, and E. juvena/isJ usually have *Although P. glaucus is generally considered to have two broods in the areas surveyed in this study, it may be that there is only one 'true' brood. It appears that a high percentage of the pupae from the previous season emerge in the early summer, constituting the 'true' first brood, and that the remaining pupae emerge later in the summer, constituting an 'appa- rent' second brood (i.e., not the progeny of the first brood of that season) (Scudder, 1889; R. Lederhouse and J. M. Scriber, unpublished data).
Slansky - Temperate Butterflies
TABLE 1. Number of broods, larval food-plants, and hibernating stages for several butterflies in three transition zone areas. Data from Forbes (1906), New England (A) ; Saunders (l932), Allegany State Park, N.Y. (B) ; and Ebner (l97O), Wisconsin (C). E = egg; L = larva; P = pupa; A = adult. Species
A B C Larval food-plants Stage
Amblyscirtessamoset 1 - 1
A. vialis 2 - 1
Euphyes don - - 1 ?
E. conspicus - - 1
Poanes massasoit 2 - 1
P. hobomok 1 1 1
P. viator - - 1
Wallengrenia otho - 1 1
Polites corns 1 - 2
P. themistocles - - 1-2
P. mystic 2 2? 1
Hesperia metea 1 - 1
H. sassacus 1 1 1
H. leonardus 1 - 1
Ancyloxipa numitor 3 3 2-3
Pholisora catullus 2 - 1
Pyrgus communis - 3 2
Erynnis icelus 1 1 1
E. brizo 1 - 1
E. lucilius 3 - 2
E. horatius 2 - -
E. juvenalis 2 - 1
Thorybes bathyllus 1 - 1
T. pylades 2 2? 1
Epargyreus clarus 1 2 1-2
Battus Philenor 2 2 -
Papilio polyxenes 2 2 2
P. glaucus 2 2 1-2
Fraxinus Prunus, Betula,
Lindera, Sassafras, Persea
246 Psyche [June
Species A B C Larval food-plants Stage
Astero campa celtis
Crucif erae P
Crucif erae P
Medicago, Trifolium P
Cruciferae, esp. buds, flowers, P
Quercus, Salix, Rubus, Mains, E
Prunus, Vaccinium, others
Quercus, Carya, Castanea E,L
Babtisia, Crotalaria, Lupinus, P
esp. flowers, fruit
Vaccinium, Prunus, Cercis, P
bores into flowers
Vaccinium, Kalmia, Arbutus, P
esp. flowers and berries
Pinus !' P
Polygonum, Phaseolus, Malva, ?
Hypericum, Humulus, others,
bores into bud, fruit
Rumex, Polygonum E
Rumex P,L ?
Leguminosae, foliage, buds, L
Cornus, Rhus, Vaccinium, P
Cimicifuga, Ceanothus, others
Salix, Betula, Populus, Tilia L
19741 Slansky - Temperate Butterflies 247 Species
of Broods nating
A B C Larval food-plants Stage
L. astyanax 1-2 2? 2
L. archippus 2 2 2
Vanessa atalanta 2 2 2
V. virginiensis 2 2 2
V. cardui 2 2 2
Junonia coenia 2 - -
Prunus, Mains, Pyrus, L
Crataegus, Salix, Populus ,
Salix, Populus, Prunus, Malus L
Artemisia, Gnaphallum, P,A
Cirsium, Carduus A,P ?
Plantago, Gerardia, Sedum, A ?
Betula, Salix, Populus A
Ulmus, Celtis, Salix, Populus A
Ulmaceae, Urticaceae A
Ulmaceae, Urticaceae A
Betula, Sa'lix, Ainus, Ribes A
Helianthus, Actinomeris, Aster L
Danaus plexippus 2 2 2 Asdepias Migratory SATYRIDAE
Lethe portlandia I 1
1 Gramineae, Cyperaceae? L
L. eurydice I 1 1 Gramineae,Cyperaceae? L Euptychia cymela
I 1 1 Gramineae L
I 1 1 Gramineae esp. Tridens L
1 - 1 Gramineae, Cyperaceae L
248 Psyche [June
one, or at most two, broods, and most hibernate in the larval and/or egg stage (Table I). This may be due to the presence in the oak leaves of tannins that restrict protein utilization and hinder larval development, in many cases limiting consumption of the foliage to spring and early summer when the protein content is highest and the tannin content lowest (Feeny, 1970).
In addition, the leaves of many species of shrubs and trees contain substantially lower percentages of water than the leaves of many annual and perennial herbs (Way, 1853 ; Fagin & Watkins, 1932 ; So0 Hoo & Fraenkel, 1966; Slansky 1974; J. M. Scriber, unpub- lished data). Since the percentage of water in most lepidopterous larvae appears to be about 80 to 90% (Evans, 1939a; 1939b; Wig- glesworth, I 967 ; Slansky, 1974 ; J. M. Scriber, unpublished data), the growth of larvae feeding on plants with a percentage of water lower than their own tissue may be limited by the availability of water so that they exhibit slower growth rates in comparison to larvae feeding on plants that have a percentage of water equal to or greater than that of the larvae (Southwood, 1972; J. M. Scriber & P. P. Feeny, ms. in prep.). The fact that a number of tree and shrub feeders exhibit but one or two broods (Table I) supports this contention. Along these lines Feeny (1974) has suggested that plant species that are abundant and/or persistent have apparently evolved "quantitative" defenses (low nutrient contents, tough leaves, high contents of unspecific chemicals like tannins) that act as significant ecological barriers to phytophagous insects, in contrast to plant spe- cies that are rare and/or ephemeral that have apparently evolved "qualitative" defenses (specific secondary chemicals) that act as only slight ecological barriers to adapted insects although having consid- erable impact as evolutionary barriers to non-adapted insects. The majority of grass- and sedge-feeders (all Satyridae and sev- eral Hesperiidae) , with characteristically sluggish larvae (Scudder, 1889), exhibit but one brood (Table I ) . In view of the low moist- ure and high fiber content of many grasses (Way, 1853; Watson, I 95 I ) , it is not surprising that larval development might 'be slow on such plants. The hibernation of many of these satyrids and hesperiids as early instar larvae (Table I) may be an adaptation for the avoid- ance of nutritionally poor, mature grass plants and for the maximum utilization of the spring flush of succulent growth when moisture and nitrogen levels are high and fiber content low (Watson, 1951). Thus, the voltinism patterns of several butterfly species are given an ecological meaning, and the hibernation of many butterfly species as eggs, larvae, and perhaps fertile adults (Scudder, 1889), when
19741 , Slansky - Temperate Butterflies 249 viewed as a means of utilizing tender, nutritious plant tissue in the spring, is seen as an adaptive strategy (c.f. Morse, 1971 ; Schoener, 197 I ) . Of course, it is not suggested that the nutritional quality of the larval food-plant is of sole importance in determining voltinism patterns. For example, larvae of both the Tawny crescent, Phyciodes batesii, and the Pearl crescent, P. tharos, feed on Aster; the former exhibits one brood and the latter two or three (Table I). Larvae of two Bolaria species and of four Speyeria species all feed on Viola; the former exhibit two to three broods, the latter one brood (Table I). There may be differences in the nutritional quality of different species of plants within these genera, but other factors appear to be causing these differences in voltinism patterns. The Least skipper, Ancyloxipa numitor, larvae of which feed on what might be characterized as 'nutritionally poor' grass plants, exhibits two or three broods while the Eastern black swallowtail, Papilio polyxenes, larvae of which feed on what might be characterized as 'nutritionally adequate' plants in the Umbelliferae, exhibits but two broods (Table I ).
Obviously, the interaction of several other factors (e.g. larval size, larval mortality rates, and the presence of adult nectar sources) with the nutritive and secondary chemical contents of the larval food-plants influences the voltinism patterns. For example, the slow growth rates of larvae of P. glaucus may only be 'permitted' because the combination of the patchy distribution and warning coloration of the larvae may reduce mortality losses from predators and para- sitoids
(J. M. Scriber, personal comm.). On the other hand, the rapid growth rates of larvae of P. rapae may be a 'necessity' because of the nature of its food-plants (i.e., mostly early successional species) and because of the high mortality losses of the larvae to predators, parasitoids, and disease (Richards, I 940 ; Pimentel, I 961 ; Dempster, 1969; Parker, 1970). The more rapid growth rates of lepidopterous larvae from 'geographical races' occurring in regions with short growing seasons in comparison to those of larvae from regions with longer growing seasons (Goldschmidt, 1940) provides another example of the ecological importance of differences in larval growth rates.
Such considerations of the interrelationship of life history phe- nomena and population dynamics ( e.g. Cole, I 954 ; Murdock, I 966 ; Istock, 1967 ; Gadgil & Bossert, 1970 ; Morse, I 971 ; Schoener, I 97 I ; Willson, 1971) raise a number of ecologically relevant and as yet insufficiently answered questions, such as :
I) What are the advantages of monophagous and polyphagous larval feeding habits (c.f. Brues, 1920; 1924 ; Buxton, 1923 ; Deth- ier, 1954; Brower, 1958; Schoener & Janzen, 1968; Levins & MacArthur, 1969) ?
2) Why do some butterflies exhibit a long-lived adult stage (e.g. almost a full year in the Tortoise shell, Nymphalis van-album) (c.f. Murdoch, I 966; Howe, 1967 ; Gadgil & Bossert, 1970) ? 3) What selective forces cause the complex voltinism pattern ex- hibited by a number of butterfly species in which part of a brood becomes dormant while the remainder continues normal development ( Scudder, I 889 ; Oliver, 1972) ? Perhaps this may allow these spe- cies to exploit marginally favorable periods while maintaining a re- serve population for the usually favorable season and/or may aid in reducing losses to temporally restricted predators and parasitoids c.f. Baltensweiler, I 968 ; Waloff, 1968). 4) Why do some butterflies exhibit multivoltinism? Perhaps this is a means of building up large populations to withstand high mor- tality losses in the summer, especially because of biological causes, and in the winter, especially because of physical causes, such as is seen in several pierid butterflies that sta,rt out with low population levels in the spring and become more abundant as the summer pro- gresses ( Scudder, 1889).
Detailed ecological studies of a taxonomically and geographically well-known group like the butterflies will help to answer such ques- tions and will aid in making meaningful predictions about such im- portant phenomena as the population buildup of a potential or actual pest species.
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