Mallard Recruitment in Northeastern California

Mauser, David M.; Jarvis, Robert L.

doi:10.2307/3809330

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Duckling survival, expressed either as late brood size (‘older ducklings per brood 1 in Table 2) or as the juve‐ nile:pair ratio, was also high in comparison with previous mallard studies (Hill, Wright & Street 1987, Orthmeyer & Ball 1990, Rotella & Ratti 1992, Mauser & Jarvis 1994, Nummi & Pöysä 1995, McLandress et al 1996, Longcore, Clugston & McCauley 1998, Krapu, Pietz, Brandt & Cox 2000). This can either be seen as a sign of low predation pressure at Nasen, or as being due to broods being observed the first time rather late in life, i.e.…”

Section: Discussionmentioning

confidence: 50%

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Density‐dependent breeding success in mallards Anas platyrhynchos on a eutrophic lake

Elmberg

2003

Wildlife Biology

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Census data from a eutrophic lake collected in 1987-1999 were used to study nesting and breeding success in mallards Anas platyrhynchos. In each year there were 6-19 pair counts and 13-34 brood counts. The maximum combined count of single males and pairs (i.e. on any day in any of three census periods in May) provided the best fit with subsequent estimates of breeding success. Nesting success (average brood:pair ratio = 0.52), brood size of older duck lings (mean = 5.7) as well as fledgling success (2.86 juveniles per nesting pair) were higher than in many previous mallard studies. Per capita brood produc tion as well as per capita fledgling production was negatively density depen dent, but the latter was not statistically independent of the former. There was no correlation between per capita fledgling success and duckling mortality on a year-by-year basis, hence the density-dependent pattern in breeding success appears to be mediated through variation in nesting success. The number of paired females at the start of the breeding season correlated positively with the pro duction of fledged juveniles the year before.

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Section: Discussionmentioning

confidence: 50%

“…there were more broods per nesting pair than in most previous mallard studies, both North American and European (e.g. Johnson et al 1992, Rotella & Ratti 1992, Nummi & Pöysä 1995, but see Mauser & Jarvis 1994). It may be that Nasen offers unusually safe nesting areas in the brushy bottomlands surrounding the lake.…”

Section: Discussionmentioning

confidence: 71%

Density‐dependent breeding success in mallards Anas platyrhynchos on a eutrophic lake

Elmberg

2003

Wildlife Biology

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“…Recruitment of female Mallards in westcentral Illinois was highly variable. Likewise, Mauser and Jarvis (1994) found a highly variable recruitment rate (0.31-1.26) in northern California and suggested the Mallard population in their study was increasing based on an average recruitment rate of 0.83. Similarly, Mallard recruitment in Ontario (0.79-0.99) was considered sufficient for population maintenance (Hoekman et al 2006b).…”

Section: Recruitmentmentioning

confidence: 77%

“…We defined recruitment (R) as the number of female ducklings surviving to 20 days posthatch per nesting female in spring. We estimated recruitment according to Mauser and Jarvis (1994) as: (R = HGS d /2), where H = hen success, G = mean brood size at hatch, and S d = duckling survival to 20 days posthatch. We monitored duck-ling survival to 20 days because most duckling mortality occurs within this period (Orthmeyer andBall 1990, Mauser et al 1994a).…”

Section: Recruitmentmentioning

confidence: 99%

“…This method assumed a 50:50 sex ratio of ducklings, hence division by 2 in the equation. We estimated the proportional change in population size (C) each spring following Mauser and Jarvis (1994): C = S(1+DR/S b ), where S was the annual adult female survival (0.520 ± 0.029; Smith and Reynolds 1992:312), D was the ratio of annual yearling survival (0.556 ± 0.049, Smith and Reynolds 1992:312) to adults, R was our estimate of recruitment, and S b was our estimate of summer (i.e., breeding season) female survival (age classes combined).…”

Section: Recruitmentmentioning

confidence: 99%

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Nesting Biology of Mallards in West-central Illinois

et al. 2009

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The number of Mallards (Anas platyrhynchos) breeding in Illinois and eastern North America has increased in recent decades; however, few studies have investigated the nesting biology of Mallards outside primary production areas. Therefore, we radiomarked resident female Mallards (n = 148) in west-central Illinois during 1998–2003 to assess nesting parameters and evaluate recruitment. Mean initiation date for first nests ranged from 22 April to 6 May, and the majority (75%) of nests were initiated by 20 May. Therefore, the majority of nests were predicted to hatch by 24 June. The nesting season averaged 88 days (range: 77–103 days). The proportion of unsuccessful females that renested ranged from 50.0–85.7%, and adults were more likely to renest (75.0%) than yearlings (48.0%). Nest success ranged from 9.8–33.3% and was 19.6% overall; hen success was 28.3%. Initial brood size was 8.2 ± 0.3 ducklings, but brood size declined to 3.0 ± 0.6 ducklings by 17 days posthatch. Brood survival to 20 days was 0.759 ± 0.081, and 20-day duckling survival was 0.413 ± 0.035. Female survival during spring-summer ranged from 0.546–1.00 and averaged 0.710 ± 0.096. Likewise, estimated Mallard recruitment varied annually (range: 0.302–0.672 female ducklings/female). Assuming constant female and duckling survival, we estimated that a recruitment rate of 0.613 female ducklings/adult female was necessary to maintain a stable Mallard breeding population in west-central Illinois. Estimated Mallard reproduction and recruitment was similar to that observed in other areas of North America. Nest success and hen success approached or exceeded estimated thresholds for population stability in most years; however, hen success averaged over the study period was insufficient for local population maintenance and growth. Female survival was comparable to that observed in other studies but may have limited population growth in some years. Duckling survival was sufficient for population maintenance. Management designed to enhance hen success and brood habitat may augment Mallard recruitment in west-central Illinois.

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A Matrix Population Model for Mottled Ducks (Anas fulvigula) of the Western Gulf Coast

Rigby

Haukos

2014

sena

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Mallard Recruitment in Northeastern California

Cited by 5 publications

References 9 publications

Density‐dependent breeding success in mallards Anas platyrhynchos on a eutrophic lake

Density‐dependent breeding success in mallards Anas platyrhynchos on a eutrophic lake

Nesting Biology of Mallards in West-central Illinois

A Matrix Population Model for Mottled Ducks (Anas fulvigula) of the Western Gulf Coast

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