Food-supplementing parents reduces their sons' song repertoire size

Zanette, Liana; Clinchy, Michael; Sung, Ha‐Cheol

doi:10.1098/rspb.2009.0450

Cited by 16 publications

(16 citation statements)

References 42 publications

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“…B 282: 20150762 rare [4,38]. Zanette et al [4] conducted a food supplementation experiment on song sparrows Melospiza melodia and tested whether male quality (using song repertoire size as a proxy of quality) differed between the adult sons of foodsupplemented and control parents. Surprisingly, Fed parents produced sons with smaller adult song repertoires, who may thus be expected to contribute fewer offspring to the next generation.…”

Section: (C) Reproductive Successmentioning

confidence: 99%

Carry-over effects of food supplementation on recruitment and breeding performance of long-lived seabirds

et al. 2015

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Supplementation of food to wild animals is extensively applied as a conservation tool to increase local production of young. However, in long-lived migratory animals, the carry-over effects of food supplementation early in life on the subsequent recruitment of individuals into natal populations and their lifetime reproductive success are largely unknown. We examine how experimental food supplementation early in life affects: (i) recruitment as breeders of kittiwakes Rissa tridactyla born in a colony on Middleton Island (Alaska) between 1996 and 2006 (n ¼ 1629) that bred in the same colony through 2013 (n ¼ 235); and (ii) breeding success of individuals that have completed their life cycle at the colony (n ¼ 56). Birds were raised in nests that were either supplemented with food (Fed) or unsupplemented (Unfed). Fledging success was higher in Fed compared with Unfed nests. After accounting for hatching rank, growth and oceanic conditions at fledging, Fed fledglings had a lower probability of recruiting as breeders in the Middleton colony than Unfed birds. The per-nest contribution of breeders was still significantly higher for Fed nests because of their higher productivity. Lifetime reproductive success of a subset of kittiwakes that thus far had completed their life cycle was not affected by the food supplementation during development. Our results cast light on the carry-over effects of early food conditions on the vital rates of long-lived animals and support food supplementation as an effective conservation strategy for long-lived seabirds.

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Section: (C) Reproductive Successmentioning

confidence: 99%

Carry-over effects of food supplementation on recruitment and breeding performance of long-lived seabirds

et al. 2015

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“…2008). Many studies across avian species have shown that larger nestlings receive the lion ' s share of parental provisioning at the cost of their smaller nestmates (Price and Ydenberg 1995, Oddie 2000, Forbes et al 2002, Zanette et al 2009). Where host nestlings are smaller than the cowbird, female host nestlings may be expected to be the most disadvantaged (Fig.…”

Section: (D)mentioning

confidence: 99%

Brood‐parasite‐induced female‐biased mortality affects songbird demography: negative implications for conservation

Zanette¹,

Clinchy²,

Leonard³

et al. 2012

Oikos

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Parasites, of all sorts, can profoundly affect host population dynamics. Parasites commonly cause sex‐biased mortality and this can add to their impact. Female‐biased mortality in particular can destabilize dynamics and promote population collapse. We previously reported in a correlative study that brown‐headed cowbird Molothrus ater brood parasitism of song sparrows Melospiza melodia appears to cause female‐biased host nestling mortality. Here, we report results from ‘infestation’ and ‘de‐infestation’ experiments designed to test whether brood parasitism causes female‐biased mortality, and we document the resulting demographic impact using a simulation model. Experimental cowbird infestation of song sparrow nests halved the proportion of female host nestlings (0.31±0.07 vs 0.59±0.06; infested vs unparasitized nests at day 6) replicating the halving reported in naturally cowbird‐parasitized nests (0.28±0.01 vs 0.57±0.05; parasitized vs unparasitized). De‐infestation of naturally cowbird‐parasitized nests in turn wholly eliminated any effect on the proportion of female host nestlings (0.53±0.13 vs 0.54±0.06; de‐infested vs unparasitized) confirming that brood parasitism is the cause. This halving of the proportion of females fledging is likely to be as significant as nest predation in affecting population dynamics, based on the elasticities derived from our demographic model (–0.50 vs –0.59). Experimental infestation reduced the testosterone levels, begging behaviour, and body mass of six day old female host nestlings, whereas males were largely unaffected, suggesting that it is the exacerbation of intra‐brood competition that may be primarily responsible for the resulting female‐biased mortality. The brown‐headed cowbird is invasive in most of North America and has been implicated in regional population declines of many native species. We suggest that female‐biased host offspring mortality is likely to be commonplace among the 144 host species the cowbird successfully parasitizes, and we discuss the negative implications for songbird conservation, given the projected demographic impact.

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“…Infection affected the condition-dependent nature of these calls, which are used in an anti-predator context ). Zanette et al (2009) found that young Song Sparrows Melospiza melodia fed by foodsupplemented parents sang less diverse songs than young from unfed parents, and discussed the possible negative effects of food-supplementing wild populations for conservation purposes. Supplemented parents laid larger clutches and lighter eggs, thus their young had to accelerate their growth more than control birds, at the detriment of their learning abilities and song output once they become adults.…”

Section: Acoustic Signals and Introduced Diseasesmentioning

confidence: 99%

The emerging significance of bioacoustics in animal species conservation

Laiolo

2010

Biological Conservation

242

167

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This review reports on the effects of human activities on animal acoustic signals published in the literature from 1970 to 2009. Almost 5% of the studies on variation in animal communication tested or hypothesized on human impacts, and showed that habitat fragmentation, direct human disturbance, introduced diseases, urbanization, hunting, chemical and noise pollution may challenge animal acoustic behaviour. Although acoustic adaptations to anthropogenic habitats have been documented, human impacts have most often generated neutral variation or potential maladaptive responses. Negative impacts have been postulated in the sexual signals of fishes, amphibians, birds, and mammals; these are concerning as any maladaptive alteration of sexual behaviour may have direct bearings on breeding success and ultimately population growth rate. Acoustic communication also facilitates other vital behaviours influenced by human-driven perturbations. Bat and cetacean echolocation, for instance, is disrupted by noise pollution, whereas bird and mammal alarming is also affected by introduced diseases and hunting. Mammal social signals are sensitive to noise pollution and hunting, and birds selecting habitats by means of acoustic cues are especially vulnerable to habitat loss. Anthropogenic intervention in these cases may have a negative impact on individual survival, recruitment and group cohesion, limiting rescue effects and triggering Allee effects. Published evidence shows that acoustic variation may be used as an early-warning indicator of perturbations even when not directly affecting individual fitness. Acoustic signalling can be studied in a broad range of ecosystems, can be recorded, analyzed, synthesised and played back with relative ease and limited economic budget, and is sensitive to many types of impacts, thus can have great conservation significance.

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Food-supplementing parents reduces their sons' song repertoire size

Cited by 16 publications

References 42 publications

Carry-over effects of food supplementation on recruitment and breeding performance of long-lived seabirds

Carry-over effects of food supplementation on recruitment and breeding performance of long-lived seabirds

Brood‐parasite‐induced female‐biased mortality affects songbird demography: negative implications for conservation

The emerging significance of bioacoustics in animal species conservation

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