Social cues are unlikely to be the single cause for early reproduction in urban European blackbirds (Turdus merula)

Dominoni, Davide M.; Hof, Thomas J. Van’t; Partecke, Jesko

doi:10.1016/j.physbeh.2015.01.026

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…It is important to note that the relationship between the basicranium and the face is complicated by the effects of factors external to both, and is likely more nuanced than what we are able to show here. Growth hormone, in particular, has substantial effects on adult morphology and exerts its effects throughout ontogeny [ 16 ]. As the last part of the skull to reach adult size [ 14 ], the face is exposed to the effects of growth hormone for the longest period of time.…”

Section: Discussionmentioning

confidence: 99%

“…The basicranium is of particular interest to evolutionary developmental biologists: firstly, it is centrally located in the skull, above the face and below the calvarium, and provides the platform upon which the brain rests; secondly, it reaches adult size prior to the calvarium and face, and thus sets the parameters for the rest of the skull as it grows [ 12 , 13 ]; thirdly, the basicranium grows via endochondral ossification within its synchondroses, making its shape and growth more likely to be under intrinsic control [ 14 ]. The basicranium differs in this respect from the calvarium and face, which are regulated by brain expansion [ 15 ] and growth hormone expression [ 16 ], respectively. The basicranium is widely thought to be central to growth and patterning of the skull, and by extension the skull’s evolutionary trajectory in mammals [ 3 , 8 , 12 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

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Mind the Gap: Genetic Manipulation of Basicranial Growth within Synchondroses Modulates Calvarial and Facial Shape in Mice through Epigenetic Interactions

et al. 2015

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Phenotypic integration patterns in the mammalian skull have long been a focus of intense interest as a result of their suspected influence on the trajectory of hominid evolution. Here we test the hypothesis that perturbation of cartilage growth, which directly affects only the chondrocranium during development, will produce coordinated shape changes in the adult calvarium and face regardless of mechanism. Using two murine models of cartilage undergrowth that target two very different mechanisms, we show that strong reduction in cartilage growth produces a short, wide, and more flexed cranial base. This in turn produces a short, wide face in both models. Cranial base and face are already correlated early in ontogeny, and the relationship between these modules gains structure through postnatal growth and development. These results provide further evidence that there exist physical interactions between developing parts of the phenotype that produce variation at a distance from the actual locus upon which a particular selective pressure is acting. Phenotypic changes observed over the course of evolution may not all require adaptationist explanations; rather, it is likely that a substantial portion of observed phenotypic variation over the history of a clade is not directly adaptive but rather a secondary consequence of some local response to selection.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mind the Gap: Genetic Manipulation of Basicranial Growth within Synchondroses Modulates Calvarial and Facial Shape in Mice through Epigenetic Interactions

et al. 2015

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“…Results in males are more variable with several studies reporting no effect of mate presence on male gonadal growth (Schwab and Lott , Dittami et al , Watts and Hahn , Dominoni et al , Watts et al ) or reduced gonadal growth in the presence of a partner (Silverin and Westin ) but others finding enhanced testis growth (Burger , Brockway , Cheng , Haase et al , Moore , Delville et al , Dufty and Wingfield ). One study finds evidence of vocal self‐stimulation of testis growth in males (Brockway ).…”

Section: Watermentioning

confidence: 99%

Non‐photic environmental cues and avian reproduction in an era of global change

Chmura

Wingfield

Hahn

2020

Journal of Avian Biology

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Ultimate factors such as food availability and weather create optimal windows of time for birds to reproduce. However, within a given year, birds must rely upon proximate environmental information such as photoperiod, food, temperature, social cues and other factors to anticipate when that window will occur and prepare physiologically for breeding. While avian responses to photoperiod are relatively well understood, less is known about how birds use non‐photoperiodic information in reproductive timing decisions – even though understanding how birds use non‐photic cues is an important component of predicting their responses to global change. We review research on the regulation of reproductive physiology and clutch initiation by non‐photic cues within and across avian species. We evaluate hypotheses in the literature about the integration of photoperiodic and non‐photic cues in reproductive timing and about differences in non‐photic cue‐use between the sexes and across species. We show how regulation of reproduction by non‐photic cues may influence species’ responses to climate change and highlight research opportunities moving forward.

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“…In European Blackbirds (Turdus merula) (Dominoni et al 2015), Abert's Towhee (Pipilo aberti) (Davies et al 2015) and Dark-eyed Juncos (Junco hyemalis) (Greives et al 2016), plasma LH levels were higher in birds that bred earlier than in those that bred later (Dawson 2008). Our results suggest that the plasma LH levels of the migratory Eurasian Skylark and resident Asian Short-toed Lark peak at the same time in the spring, suggesting that both species activate the HPG axis at the same time.…”

Section: Changes Of Reproductive Hormonesmentioning

confidence: 99%

Do migrant and resident species differ in the timing of increases in reproductive and thyroid hormone secretion and body mass? A case study in the comparison of pre-breeding physiological rhythms in the Eurasian Skylark and Asian Short-toed Lark

et al. 2017

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Background: Physiological preparation for reproduction in small passerines involves the increased secretion of reproductive hormones, elevation of the metabolic rate and energy storage, all of which are essential for reproduction. However, it is unclear whether the timing of the physiological processes involved is the same in resident and migrant species that breed in the same area. To answer this question, we compared temporal variation in the plasma concentration of luteinizing hormone (LH), testosterone (T), estradiol (E 2 ), triiothyronine (T 3 ) and body mass, between a migrant species, the Eurasian Skylark (Alauda arvensis) and a resident species, the Asian Short-toed Lark (Calandrella cheleensis), both of which breed in northeastern Inner Mongolia, China, during the 2014 and 2015 breeding seasons.Methods: Twenty adult Eurasian Skylarks and twenty Asian Short-toed Larks were captured on March 15, 2014 and 2015 and housed in out-door aviaries. Plasma LH, T (males), E 2 (females), T 3 and the body mass of each bird were measured every six days from March 25 to May 6. Results:With the exception of T, which peaked earlier in the Asian Short-toed Lark in 2014, plasma concentrations of LH, T, E 2 andT 3 of both species peaked at almost the same time. However, Asian Short-toed Larks attained peak body mass earlier than Eurasian Skylarks. Plasma T 3 concentrations peaked 12 days earlier than plasma LH in both species. Generally, plasma LH, T, E 2 , T 3 and body mass, peaked earlier in both species in 2014 than 2015. Conclusions:The timing of pre-reproductive changes in the endocrine system and energy metabolism can be the same in migrant and resident species; however, residents may accumulate energy reserves faster than migrants. Although migration does not affect the timing of pre-breeding reproductive and metabolic changes, migrant species may need more time to increase their body mass. T levels in resident species may be accelerated by higher spring temperatures that may also advance the pre-breeding preparation of both migrants and residents.

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Social cues are unlikely to be the single cause for early reproduction in urban European blackbirds (Turdus merula)

Cited by 10 publications

References 43 publications

Mind the Gap: Genetic Manipulation of Basicranial Growth within Synchondroses Modulates Calvarial and Facial Shape in Mice through Epigenetic Interactions

Mind the Gap: Genetic Manipulation of Basicranial Growth within Synchondroses Modulates Calvarial and Facial Shape in Mice through Epigenetic Interactions

Non‐photic environmental cues and avian reproduction in an era of global change

Do migrant and resident species differ in the timing of increases in reproductive and thyroid hormone secretion and body mass? A case study in the comparison of pre-breeding physiological rhythms in the Eurasian Skylark and Asian Short-toed Lark

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