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Ontogeny and Allometry of Body Shape in the Blacktail Shiner, Cyprinella Venusta

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Ontogeny and Allometry of Body Shape in the Blacktail Shiner, Cyprinella Venusta Copeia, 2000(1), pp. 270±275 Ontogeny and Allometry of Body Shape in the Blacktail Shiner, Cyprinella venusta CRAIG S. HOOD AND DAVID C. HEINS Ontogenetic changes in body shape and its associated allometry were studied in the Blacktail Shiner, Cyprinella venusta, using geometric morphometric methods. We used a single, large sample (n 5 397; 182 males, 215 females), collected in Catahoula Creek, Jourdan River drainage, Hancock County, Mississippi. Ten body landmarks were digitized from each specimen, which yielded partial warp scores that were used as shape variables to describe body shape change during ontogeny, assess sexual dimorphism, and investigate the relationship between reproductive status and on- togenetic body shape change. We also assessed the effect of sexual dimorphism on size and body shape. The null hypothesis of isometry during ontogeny was strongly rejected by multivariate regression of shape on size for both sexes (males, P , 0.0001, F 5 21.970; females, P , 0.0001, F 5 16.238). We found large, highly signi®cant sexually dimorphic differences in the body shapes of males and females (MANOVA for overall shape, P , 0.0001, F 5 7.535, Wilks' lambda, 0.758), which remained signi®cant using MANCOVA with size as a covariate (log SL, P , 0.0001, F 5 34.872, Wilks' lambda, 0.438; log CS, P , 0.0001, F 5 34.829, Wilks' lambda, 0.439). Moreover, the ontogeny of body shape differs between males and females. There were highly signi®cant shape differences among reproductive classes within males and females. These ®ndings suggest that change in reproductive status may occur in concert with body shape change. HE study of body shape in ®shes has been (Loos and Fuiman, 1978; Loos et al., 1979). The T a subject of research investigations for over present paper analyzes ontogeny of body shape a century. Only recently have geometric mor- in the Blacktail Shiner, Cyprinella venusta, a com- phometric methods been used to understand mon freshwater cyprinid inhabiting medium to body shape change and its associated allometry large river tributaries of the southeastern and during ontogeny (Bookstein, 1991; Rohlf, 1998; central United States. The objectives of the Zelditch et al., 1998). As a result, the ontogeny study were to describe ontogenetic body shape of body shape change has been studied for only change and its concomitant allometries in a a small number of ®shes, including the Piranha, common North American minnow, to assess sex- Pygocentrus (Fink and Zelditch, 1995a, 1995b; ual dimorphism in the ontogeny of shape Zelditch and Fink, 1995), Threespine Stickle- change, and to investigate the relationship be- back, Gasterosteus (Walker, 1993, 1997); Sea Bass, tween reproductive status and ontogenetic Dicentrarchus (Loy et al., 1996); Sea Bream, Di- changes in body shape. plodus (Loy et al., 1998); and Callichthyid Cat- ®sh, Callichthyes (Reis et al., 1998). These studies have shown that body shape changes during on- MATERIALS AND METHODS togeny are not simply the result of uniform large-scale events (e.g., dorsoventral elonga- We chose a single, large sample (n 5 397 tion) but that localized small-scale shape chang- specimens, Table 1) for our analyses to avoid es unique to each species contribute to its on- any potential confounding effects associated togeny. Interestingly, none of these studies de- with multiple collections from different times or tected sexual dimorphism in body shape within localities. The sample (Mississippi State Univer- the study species, although small sample sizes in sity, MSU 933) was taken by minnow seine on several studies did not allow a rigorous evalua- 26 May 1970 from Catahoula Creek below the tion. mouth of Dead Tiger Creek, Jourdan River Even less is known about body shape ontog- drainage, Hancock County, Mississippi. Speci- eny in cyprinid ®shes. Studies of development mens were ®xed in 10% formalin and preserved in cyprinids include an overview of larval devel- in 50% isopropyl alcohol. The study site has opment within ostariophysian ®shes by Fuiman been described by Heins and Clemmer (1975), (1984) and qualitative descriptions of larvae and various aspects of the reproductive biology and posttransformational ®shes in Notropis of C. venusta at Catahoula Creek have been de- q 2000 by the American Society of Ichthyologists and Herpetologists HOOD AND HEINSÐBODY SHAPE IN CYPRINELLA VENUSTA 271 TABLE 1. SIZE DISTRIBUTION (SL, mm) OF SPECIMENS. Size classes were not used in statistical analyses but illustrate the size distribution of the sample [(n 5 182 males (range 22±87 mm, mean 43 mm), 215 females (range 22±72 mm mean 43 mm)]. SL size class mm 20 25 30 35 40 45 50 55 60 65 70 75 $80 Males 5 12 25 37 32 16 17 24 5 2 3 1 2 Females 4 9 46 29 35 33 18 18 9 12 2 0 0 scribed by Heins and Dorsett (1986) and Heins unpubl.). The landmarks were analyzed using and Baker (1987). morphometric (tpsREGR vers. 1.18, F. J. Rohlf, We tested the effect of alcohol preservation 1998, unpubl.; tpsRELW vers. 1.14, F. J. Rohlf, on shape using another sample of fresh-caught 1997, unpubl.; MORPHEUS vers. 1-30-98, D. specimens. Our results showed that isopropyl al- Slice, 1998, unpubl.) and statistical (SAS vers. cohol does not signi®cantly change shape data 6.12, SAS Institute Inc., 1996; NTSYS vers. 2.02c, after three months of storage when compared Applied Biostatistics Inc., 1998, unpubl.) pro- to initial observations of formalin-®xed ®sh grams. (pers. obs.). Following image capture, we determined the We collected data for 10 landmarks on each sex and reproductive condition of ®sh by go- individual (Fig. 1) using a two-dimensional vid- nadal examination. Males were classed into ®ve eo-based data capture system that included a stages of reproductive condition using a scheme BW CCD video camera and PCVISION1 frame- modi®ed from Heins and Machado (1993). Sex- grabber. Landmarks were obtained using the ually immature (latent, LA) males had very digitizing software program MORPHOSYS small, threadlike testes that were transparent to (vers. 1.29, C. Meacham and T. Duncan, 1990, cloudy white or translucent. The enlarged, opaque white testes of sexually mature males were categorized into four classes of enlarge- ment, including small (MA1, threadlike), mod- erate (MA2, cordlike), large (MA3, rope-like), and very large (MA4, bulging-convoluted). We determined the reproductive condition of females, using with some modi®cation, the ovar- ian classi®cation of Heins and Rabito (1986), which should be consulted for further details. Sexually immature (latent, LA) females had ova- Fig. 1. Landmarks used to capture body shape var- ries without developing eggs (translucent to iation in Cyprinella venusta; all landmarks were located white oocytes). Sexually mature females in all on midline of the body in each specimen: (1) origin other stages of ovarian condition had, in their of dorsal ®n, basal junction of ®rst dorsal ®n ray; (2) follicles, one or two groups of gametic cells un- nape of neck, posterior boundary of supraoccipital dergoing ovum formation. Early maturing (EM) bone; (3) tip of snout, upper margin of mouth; (4) females had ovaries containing one group of posterior margin of opercular series; (5) origin of pel- translucent to white oocytes. Ovaries of late ma- vic ®n, basal junction of ®rst pelvic ®n ray; (6) origin of anal ®n, basal junction of ®rst anal ®n ray; (7) turing (LM) females contained a single, bimod- origin of anal ®n, basal junction of the last anal ®n al group of oocytes that were white to cream ray; (8) origin of caudal ®n, basal junction of ventral- colored. Mature (MA) females had ovaries con- most caudal ®n ray; (9) origin of caudal ®n, basal taining two distinct groups of oocytes in the fol- junction of dorsal-most caudal ®n ray; (10) origin of licles, the larger ones being cream to yellow. dorsal ®n, basal junction of the last dorsal ®n ray. A Ovaries of ripening (MR) females also had two series of 103 specimens were digitized twice (three separate groups of follicular oocytes, the larger months between capture sessions) to evaluate mea- oocytes being translucent with elevated vitelline surement error associated with these landmarks. Paired t-tests of centroid size (CS) on these repeated membranes. Ovaries of ripe (RE) females had digitizing sessions were nonsigni®cant (P 5 0.954, t 5 one group of white to cream oocytes in the fol- 0.058), root mean square error (RMS) was 0.034 mm licles with ovulated, ripe eggs (transparent with and percent incongruence (PI) 0.055% (Hildebolt elevated vitelline membranes) in the ovarian lu- and Vannier, 1988). mina. 272 COPEIA, 2000, NO. 1 A preliminary study of adult C. venusta dem- different stages of reproductive condition: onstrated highly signi®cant sexual dimorphism males, LA, MA1-MA3, MA4; females, LA, EM- in both size and shape variables; therefore, sex- LM, and MA-RE. The number of MA4 males was es were treated separately throughout the statis- too small to include in statistical analyses. tical analyses. We used standard length (SL in mm) and centroid size (CS) as measures of size. RESULTS Centroid size is a geometrically based measure that is the square root of the sum of the squared ANOVAs testing sexual size dimorphism distances of landmarks to their centroid (Book- showed there were signi®cant differences in size stein, 1989, 1991). Both SL and CS were log between the sexes (log SL, P 5 0.004, F 5 8.389; transformed prior to statistical analysis. log CS, P 5 0.006, F 5 7.760), with adult males We described shape changes during ontogeny being larger (mean, 53.5 mm in SL) than adult using geometric morphometric methods (Book- females (mean, 49.1 mm in SL).
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