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P0085-P0087.Pdf SHORT COMMUNICATIONS 85 WHITTOW, G. C. 1980. Physiologicaland ecologicalcor- Present addressof secondauthor: North Carolina State relatesof prolongedincubation in seabirds. Am. Zool. Museum of Natural History, P.O. Box 27647, Raleigh, 20:421-4X% North Carolina 2761 I. Received 1I February 1983. Final acceptance26 September 1983. Department of Physiology,John A. Burns Schoolof Med- icine, University of Hawaii, Honolulu, Hawaii 96822. The Condor 86:85-87 to be much lower than in other yearsand our netting efforts 0 The CooperOrnithological Society 1984 were relatively unsuccessful. At ThousandOaks there was a consistentvearlv nattem SEX AND AGE RATIOS IN to the sex ratio data (Table 1). Significantly fewer males were capturedthan females (626 vs. 897, x2 = 48.22, P < WINTERING WHITE-CROWNED 0.001). The proportion of males (41%) was lower than in SPARROWS the Owens Vallev samole or in one netted to the north near Bakersfield(Kern Co.) by Hardy et al. (1965) again supporting the trend for fewer males to winter at lower MARTIN L. MORTON latitude (Table 2). Given that Z. 1.gambelii consistently return to the same wintering area (Mewaldt 1964, 1976; Cortopassiand Me- Differential migration of the sexesoccurs in many species waldt 1965) the latitudinal cline in sex ratio is maintained of North Ame&an songbirds.The resultant asymmetry becauseimmature males stop their southward migration in distribution on the wintering groundshas a consistent sooner than immature females. Presumably this benefits pattern in that males tend to occur farther north than males becauseit would facilitate their early return to the females (Ketterson and Nolan 1976). In Gambel’s White- breeding area and procurement of a territory (King et al. crowned Sparrow (Zonotrichia leucophrysgambelit) the 1965). In addition, they would experience a shorter, less latitudinal cline thus generated is quite marked. Popula- hazardous migration. Natural selection should favor the tions near the northern limit of the winter range in Wash- sameresponse in femalesexcept that they are smaller than ington contain about 80% maleswhereas those to the south males and may be displacedfrom food by them (Parsons near the Mexican border may be only about 25% males and Baotista 1980). Intersexual behavioral dominance is (King et al. 1965). Major informational gaps still exist, probabiy greaterin harsher(more northern) climates (Ket- however, concerningthe winter distribution of Z. 1.gam- terson and Nolan 1979). Female Z. 1.gambelii also cannot belii. Especially lacking are large unbiased samples from fast as long as males (Ketterson and King 1977) and pre- discretelocations. Herein are presentedadditional data on sumably are less likely to survive severe storms. sex ratios in wintering Z. 1.gambelii as well as evidence In large netted samplesthe percentageof immatures in that they experience differential mortality with both age wintering flocks declines from about 70% in southern and sex. Washington, 46”N, to about 50% in southern California, 34-35”N (Table 2). Since the proportion of immatures at a given location remains unchangedthroughout the winter METHODS (King et al. 1965), they apparentlyexperience a differential Wintering populations were sampled by mist-netting at increasein mortality rate over adultsas migration distance two locationsin California, one in the Owens Valley (Inyo increases.This seems sensiblebecause immatures are in- Co.) and the other near Thousand Oaks (Ventura Co.). experienced navigators and more are prone to go astray The Owens Valley is a deep, narrow corridor in eastern during migration (Stewart et al. 1974). Guidance could be California that is borderedon its westernedge by the Sierra provided by adults but there is no assurancethat such Nevada. Birds were captured there from fencerows and always occurs.The first flocks that form on the breeding on fallow lands between Olancha and Bishop, a distance of 130 km. At Thousand Oaks, 50 km northwest of Los Angeles, Z. 1. gambelii (and a few Z. 1. pugetensis)were captured on agricultural lands lying 4 km or less to the west of the city. All birds were sexed by laparotomy and aged by crown color. TABLE 1. Sex and age of Zonotrichia leucophrysgam- belii captured from two wintering areas in California. RESULTS AND DISCUSSION Adults Immatures In the Owens Valley significantly more males were cap- Location YeaI Males Females Males Females tured than females (366 vs. 281; x2 = 11.17, P < O.OOj, Table 1). This nrooortion of males f57Oh)is considerablv Owens Valley lower than thai reported for Washington populations by 1968 100 72 108 76 Kinget al. 1965 (80%) and Lewis et al. 1968 (77%) (Table 1969 24 9 2), thus supporting the putative latitudinal cline in sex 1970 i: 46 49 6; ratio. It is higher, however, than ratios obtained from Total 200 142 166 139 museum specimensalso collected east of the Sierra Ne- Thousand Oaks vada (38%, Emlen 1943; 45%, King et al. 1965) and does 1977 58 not lend support to Emlen’s (1943) suggestionthat the 67 35 49 1978 65 mountains divide wintering populations with highly dis- 94 54 85 1979 76 parate sex ratios favoring males to the west and females 73 59 75 1980 41 to the east. 65 59 108 1981 71 The small sample collected in 1969 (Table 1) has sig- 110 57 100 1982 nificancein that the Owens Valley had received more snow - 37 - 27 34 Total than usual.Numbers of Z. 1.gambelii in the area appeared 446 291 451 86 SHORT COMMUNICATIONS TABLE 2. Percentageof males and immatures in Zonotrichiu leucophrysgumbelii wintering at various latitudes. Latitudes given often only approximate the center of collection areas. Large samplesobtained by mist-netting from reasonablydiscrete areas are italicized. Lat. M&S lmmatures Locationor area Ti % (n) % (n) Data source Snake River Canyon, WA 46.5 80 (1899) 69 (2256) King et al. 1965 Yakima River, WA 46.3 77 ( 706) 68 ( 706) Lewis et al. 1968 Central Valley, CA 38.5 79 ( 181) - - Emlen 1943 Utah 38.3 67 - - King et al. 1965 Great Basin 37.0 38 i 1:;; - Emlen 1943 Central California 37.0 60 (2343) King et al. 1965 Central Valley, CA 37.0 66 ( 112) - King et al. 1965 Owens Valley, CA 37.0 57 ( 647) 47 ( 647) Morton, present study Central California & Great Basin 36.6 50 ( 391) - - King et al. 1965 Central California Coast 35.5 69 ( 39) - Emlen, 1943 Bakersfield,CA 35.5 49 ( 869) 50 ( 949) Hardy et al. 1965 Thousand Oaks, CA 34.3 41 (1523) 49 (1523) Morton, present study Southern California 33.6 54 ( 408) - - King et al. 1965 Southern California & adjacent 33.5 55 ( 163) Emlen 1943 Brawley, CA 33.1 48 (23) Morton, present study Southern Arizona 32.0 2: I 22:; - - King et al. 1965 Northwestern Mexico 28.6 39 ( 95) - - King et al. 1965 ground are composed of immatures (Morton et al. 1969) mortality is higher in adult females than in males. Addi- and many of these disappearwell before adults are phys- tional support for this comes from a study in progresson iologically prepared for migration. Other possible hin- Z. 1.oriantha, a migratory race that breedsat high altitude. drances to young birds are that they are naive about fa- Each year slightly more females than males have been vorable locations for feeding during migration and may recruited to our study population at Tioga Pass (Baptista not be as accomplishedas adults in foraging. Still, adults and Morton 1982). In Z. 1. nuttalli, a nonmigratory race, migrate along broad fronts and do not themselves have mortality rates in adults were not different (Baker et al. regular annual stopping places (Cortopassi and Mewaldt 1981). Another explanation for the age ratio changewith 1965). latitude is that some individuals shift their wintering area If immature sparrowshave the same lean body mass as southward after the first year. I have no data on Z. 1. adults but are relatively inept at foraging, they might be gambeliibut a movement of this type has been discovered lighter than adults during migration. Adult Z. 1.gumbelii in Dark-eyed Juncos(Bunco h. hyemalis)by Ketterson and of both sexesin passagein September at Pullman, Wash- Nolan (1982). ington were consistentlyabout 2% heavier than immatures In summary, these data support the traditional notion (King and Mewaldt 1981). Z. 1. gambelii also migrate that wintering Z. 1.gambelii exhibit a latitudinal cline in through my study area in the Sierra Nevada at Tioga Pass sex ratio. There also appears to be a cline in immature (37.9ON)in September and October (Morton et al. 1973). birds such that their abundance, relative to adults, de- For the past four years (1979-1982) my students and I creaseswith latitude, i.e., fewer immatures winter farther have trapped, banded and weighed these birds. Adults of south. I hypothesizethat differential mortality, related to both sexes were significantly heavier (t-test) than their migration distance, occursin immatures. Finally, the age immature counterpartsupon arrival, i.e., upon first cap- and sex ratios within given samplesindicate that the mor- ture (Table 3). Only 30.4% (188 of 6 18) of the Tioga Pass tality rate of adult females is higher than that of adult Z. 1. gumbelii were immatures (Table 3). The dynamics males. of migration throughthis high-altitude route are still under investigation. Over the years many Occidental College studentshave In three locationswhere age and sex have been reported joined me on pre-dawn treks to netting areas.Their efforts for wintering Z. I. gumbelii, the percent of males among and enthusiasmwere most welcome and helpful. I would adults is higher than among immatures. The reverse is like to acknowledgein particular the assistanceof Paul true for females (Table 4). This change in sex ratio with Mead, Maria Pereyra, May Wakamatsu and Eileen Zerba. age is highly significant (x2 = 28.54, P < 0.001).
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