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Immune Suppression and the Cost of Reproduction in the Ground Cricket, Allonemobius Socius

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Immune Suppression and the Cost of Reproduction in the Ground Cricket, Allonemobius Socius Evolution, 58(11), 2004, pp. 2478±2485 IMMUNE SUPPRESSION AND THE COST OF REPRODUCTION IN THE GROUND CRICKET, ALLONEMOBIUS SOCIUS KENNETH M. FEDORKA,1,2 MARLENE ZUK,1 AND TIMOTHY A. MOUSSEAU3 1Department of Biology, University of California Riverside, Riverside, California 92521 3Department of Biology, University of South Carolina, Columbia, South Carolina 29208 Abstract. One of the most common life history trade-offs in animals is the reduction in survivorship with increasing reproductive effort. Despite the prevalence of this pattern, its underlying physiological mechanisms are not well understood. Here we test the hypothesis that immune suppression mediates this phenotypic trade-off by manipulating reproductive effort and measuring immune function and mortality rates in the striped ground cricket, Allonemobius socius. Because A. socius males provide females with a hemolymph-based nuptial gift during copulation, and many structural components of immunity reside in the hemolymph, we also predicted that sexual selection may differentially affect how disease resistance evolves in males and females. We found that an increased mating effort resulted in a reduced immune ability, coupled with an increased rate in age-speci®c mortality for both sexes. Thus, immune suppression appears to be a link between reproductive effort and cost in this system. In addition, males and females appeared to differentially invest in several aspects of immunity prior to mating, with males exhibiting a higher concentration of circulating hemocytes and a superior bacterial defense capability. This pattern may be the result of previously established positive selection on gift size due to its affect on female fecundity. In short, female choice for larger gifts may lead to a sexually dimorphic immune ability. Key words. Hemolymph, immunocompetence, life-history trade-off, sexual dimorphism, sexual selection, survivor- ship. Received June 25, 2004. Accepted August 11, 2004. Selection acts to maximize ®tness by favoring those in- tem serves as the link between reproductive effort and re- dividuals (genotypes) who produce the largest number of productive cost. successful offspring (Reznick et al. 2000). However, an in- One possible candidate that has received recent attention crease in reproductive effort can create a shortfall in resources is the immune system (Sheldon and Verhulst 1996). For in- that are necessary for other important life-history traits such stance, previous work has shown that mating effort induces as somatic maintenance, growth, or survival (Roff 1992). immune suppression in both the damsel¯y, Matrona basilaris This cost of reproduction need not be limited to an internal japonica (Siva-Jothy et al. 1998) and the fruit ¯y Drosophila trade-off (physiological costs), but may be realized through melanogaster (McKean and Nunney 2001). However, few other exogenous forces such as an increased exposure to pred- studies have linked a reduction in immunocompetence due ators or disease (ecological costs). From a logical standpoint, to mating directly with a reduction in survivorship (but see reproductive costs make sense; otherwise evolution would Nordling et al. 1998). The reason for the negative relationship give rise to organisms that exhibit the best of all possible between mating effort and immunity is likely due to the com- phenotypes, that is, organisms with an unbounded growth petitive allocation of resources (Sheldon and Verhulst 1996), rate coupled with an unlimited reproductive output (Reznick where shared components necessary for reproduction are di- et al. 2000). verted from immune defense during periods of sexual activ- In particular, the survival costs associated with reproduc- ity. However, recent work in the mealworm beetle, Tenebrio tion have been empirically well established across a diverse molitor, suggests that immune suppression may also be due array of organisms including plants, insects, ®sh, and birds to physiological antagonism between hormones associated (e.g., Tatar and Promislow 1997; Hutchings et al. 1999; Hau- with increased sexual activity and key immune components tekeete et al. 2001; Wheelwright et al. 2003). For instance, (Rolff and Siva-Jothy 2002). in the western gull, Larus occidentalis, males and females Considering that the sexes possess different optimal re- who exhibited an earlier age at ®rst reproduction, or females productive phenotypes (Rice 1996), we might also expect the that attempted to breed more frequently, had a reduced prob- trade-off pattern between reproduction and immunity to be ability of survival (Pyle et al. 1997). Although survival trade- sexually dimorphic (Kurtz et al. 2000). In other words, be- offs of this nature are common, the physiological mechanisms cause males are expected to invest more in current repro- underlying this relationship are not well understood. Those duction than females (Trivers 1972), fewer resources may be studies that have addressed the underlying physiology have available for immune defense. Consequently, males would generally focused on differences in metabolic rates and en- suffer higher rates of parasitic infection coupled with a short- ergy consumption with regard to reproductive status (re- er life span (Zuk 1990). This pattern of infection and lon- viewed in Zera and Harshman 2001). However, the question gevity is well established in vertebrates and is usually attri- often remains which energetically costly physiological sys- buted to the detrimental side effects of testosterone on im- munity (Zuk and McKean 1996; Moore and Wilson 2002). However, due to the divergent selection pressures on males 2 Present address: Department of Genetics, University of Georgia, and females, one may expect this pattern to exist in other Athens, Georgia 30602; E-mail: [email protected]. sexually reproducing organisms, regardless of hormonal in- 2478 q 2004 The Society for the Study of Evolution. All rights reserved. CRICKET REPRODUCTION, IMMUNITY, AND SURVIVAL 2479 teractions. Previous investigations into sex-speci®c parasite phenoloxidase, which is also a key component of invertebrate loads in testosterone-free systems (i.e., arthropods), however, innate immunity (SoÈderhaÈll and Cerenius 1998; Siva-Jothy have provided inconsistent results (Sheridan et al. 2000; Zuk et al. 2001; Rolf and Siva-Jothy 2002). (3) Lytic activity et al. 2004). provided a measure of another hemolymph-bound enzyme, Here, we investigated the cost of reproduction as mediated lysozyme, which provides a general defense against bacterial by immune response in the striped ground cricket Allone- insults (Rantala and Kortet 2003). (4) Encapsulation ability mobius socius. Among crickets, Allonemobius are unique be- provided a measure of the degree to which a macroscopic cause males possess a specialized tibial spur that the females invading body (e.g., parasitoid egg) is engulfed by hemocytes chew during copulation, providing a hemolymph-based nup- and melanized, thereby killing the invader. Encapsulation tial gift (Fedorka and Mousseau 2002a). Previous studies requires the coordination of several cell-mediated and hu- suggest that the size of the gift is positively related to male moral immune components (Ratcliff 1993) and therefore pro- body size and to female reproductive success, creating direct vides a simple and reliable assay as to the direct effectiveness selection on gift size due to a female mating bias for large of an individual's immune system (Siva-Jothy et al. 2001). males (Fedorka and Mousseau 2002b). Because many of the structural components of immunity reside in the hemolymph Mating and Immune Assay (Gupta 1991), this system offers a unique opportunity to ex- amine how sexual selection in¯uences the evolution of dis- Experimental crickets were second generation laboratory- ease resistance. Due to both the cuticular wounding and he- reared individuals derived from gravid, wild-caught females molymph loss associated with spur feeding, we predicted that from central South Carolina. All crickets were maintained in males would incur an exaggerated reproductive cost by en- 10 3 10 3 8 cm plastic cages containing ground cat food, gaging in prolonged or repetitive mating bouts. In addition, a carrot slice, dampened cheesecloth (water source and ovi- the oral transfer of defensive components between individ- position material), and strips of brown paper towel for cover. uals is not uncommon (e.g., Eisner et al. 1997). Therefore, Every two days the food, carrot and paper towel were re- females may gain an immune advantage through increased placed. At this time, newly eclosed adults were separated and courtship feeding if hemolymph-bound immune components caged as sex-speci®c cohorts. All cages were kept in a con- are in some way transferable. Thus, how the sexes invest in stant environment at 28.58 C and a 12:12 (L:D) photoperiod immunity may be dimorphic, with males exhibiting a higher provided by a Precision incubator (model 818; Precision Sci- initial investment to compensate for their future loss. enti®c, Chicago, IL). The age of laboratory reared experi- In this study, we addressed two main hypotheses concern- mental crickets was 12 6 1 days posteclosion. ing the cost of reproduction and immunity: (1) increased In this system, mating begins with a male performing a reproductive effort reduces immune response, which leads to courtship song and display that culminates with the male a reduction in survivorship, and (2) the trade-off patterns orienting his abdomen toward a stationary female.
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