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456 GROSS ET AL NEST 1 - ~--~ ....... --- --.. ;- ,- a ---: :::I == II, Ie: - ..... - j~ --- ~- ~~I~ ---.. -- - ~-.--.I ---: .. - b -- '-- ..... -- ,- d --- ; -- ........ .......... - - '-, : ,-- ~.,.,. _.,,,)5.:,_ -,- -- ? NEST 2 L=s=:);!rl~ - -""......~ - - II . II ;: I~DrC;ll;; FIGURE 6, -An example of the decision process used in the double-blind test to determine a fry's nest of origin (unknown fry), Comparisons of banding patterns were made between the unknown fry (?) and four fry from two nests (nest I and nest 2), with each nest run on a separate gel and the unknown fry on a third gel (size markers on each gel are not shown), Solid brackets and upper-case letters denote some of the complementary regions where banding patterns match between the unknown fry and the fry from nest 2, Dotted brackets and lower-case letters denote some of the complementary regions where banding patterns do not match between the unknown fry and the fry from nest 1. In region A-a, the unknown fry and nest 2 fry both show to intense, higher-molecular-weight bands followed by a faint, lower-molecular-weight band; nest I fry show an inverted pattern ofa faint band followed by two intense bands, In region B-b, the unknown fry and nest 2 fry show two intense bands followed by a faint band; nest I fry show only two intense bands with a greater relative distance between them than exists between the two intense bands from nest 2 fry, In region C-<:, a band is present in nest I fry but is absent in the unknown fry and nest 2 fry, In region D-<\, two close bands occur in the unknown fry and nest 2 fry, whereas a single band occurs in nest 1 fry, Comparisons among these four highlighted regions led to the correct conclusion that the unknown fry originated from nest 2, tion, Inbreeding is the mating of relatives that share greater common ancestry than if they had been drawn at random from a large deme (Shields 1993), To locate and inbreed with relatives in a large system like Lake Opeongo during the short spawn- ing season, smallmouth bass would have to be philopatric, Philopatry is defined as relatively lo- calized dispersal of propagules or the return of mobile propagules to their birthplace for repro- duction (Shields 1982), Species that are consid- ered philopatric either remain near their birth- place throughout life, as is the case with some populations of the house mouse ,\.fus musculus (Selander and Yang 1969), or they disperse widely as juveniles and return to mate at their natal site of origin. as is the case with the Laysan albatross Diomedea immUlabilis (Fisher 1971), Philopatry tends to concentrate relatives during reproduc-