Comparative development and evolution of two lateral line phenotypes in lake malawi cichlids

Webb, Jacqueline F.; Bird, Nathan C.; Carter, Lauren; Dickson, Juleen

doi:10.1002/jmor.20247

Cited by 25 publications

(27 citation statements)

References 29 publications

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“…The canal segments that compose a lateral line canal are known to develop asynchronously in other cichlids [29,47], and thus, it was expected that each canal segment in the SO and the MD canals would not necessarily be observed at all four developmental stages (I-IV) among individuals analyzed in this study (as in [47]). Thus, mean fish size at first canal enclosure (Stage III) and canal ossification (Stage IV) for each segment within a canal (SO1 to 5; MD1 to 5), and minimum canal diameter at first canal enclosure (Stage III) and canal ossification (Stage IV) for each segment within a canal, were used to approximate the onset of these processes.…”

Section: Methodsmentioning

confidence: 99%

“…Most cichlids have narrow lateral line canals [29,42-44], but a few genera endemic to Lake Tanganyika and Lake Malawi have widened lateral line canals [39,45,46]. A recent comparison of the development of the SO and MD lateral line canals in the Lake Malawi cichlids, Labeotropheus fuelleborni and Metriaclima zebra , both mbuna (rock dwelling) species with narrow canals, and Aulonocara baenschi , a non-mbuna (sand dwelling) species with widened canals, demonstrated that differences in the rate of increase in canal diameter and canal neuromast size can explain the evolution of the widened canal phenotype [47]. …”

Section: Introductionmentioning

confidence: 99%

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Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

Bird

Webb

2014

EvoDevo

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BackgroundThe canals of the mechanosensory lateral line system are components of the dermatocranium, and demonstrate phenotypic variation in bony fishes. Widened lateral line canals evolved convergently in a limited number of families of teleost fishes and it had been hypothesized that they evolved from narrow canals via heterochrony and explore modularity in the lateral line system. Two species of cichlids with different canal phenotypes were used to test a hypothesis of heterochrony. Histological material prepared from ontogenetic series of Aulonocara stuartgranti (widened canals) and Tramitichromis sp. (narrow canals) was analyzed using ANCOVA to determine rates of increase in canal diameter and neuromast size (length, width) and to compare the timing of onset of critical stages in canal morphogenesis (enclosure, ossification).ResultsA faster rate of increase in canal diameter and neuromast width (but not length), and a delay in onset of canal morphogenesis were found in Aulonocara relative to Tramitichromis. However, rates of increase in canal diameter and neuromast size among canals, among canal portions and among canals segments reveal similar trends within both species.ConclusionThe evolution of widened lateral line canals is the result of dissociated heterochrony - acceleration in the rate of increase of both canal diameter and neuromast size, and delay in the onset of canal morphogenesis, in Aulonocara (widened canals) relative to Tramitichromis (narrow canals). Common rates of increase in canal diameter and neuromast size among canal portions in different dermatocranial bones and among canal segments reflect the absence of local heterochronies, and suggest modular integration among canals in each species. Thus, canal and neuromast morphology are more strongly influenced by their identities as features of the lateral line system than by the attributes of the dermatocranial bones in which the canals are found. Rate heterochrony manifested during the larval stage ensures that the widened canal phenotype, known to be associated with benthic prey detection in adult Aulonocara, is already present before feeding commences. Heterochrony can likely explain the convergent evolution of widened lateral line canals among diverse taxa. The lateral line system provides a valuable context for novel analyses of the relationship between developmental processes and the evolution of behaviorally and ecologically relevant phenotypes in fishes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

Bird

Webb

2014

EvoDevo

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“…These hillock-shaped structures were identified as CNs based on their shape, size and location in between two adjacent pores (figure 4b). The surprisingly rare occurrence of CNs in the mCT data could be related to the high length-to-width ratio of these structures [21,71]. In the ide, the size of an individual CN was estimated to be about 23 Â 104 mm [32].…”

Section: Photogrammetry-based Reconstructions Of the Cephalic Lateralmentioning

confidence: 95%

“…rsif.royalsocietypublishing.org J. R. Soc. Interface 14: 20160898 [7,21,65]. Although these studies resulted in detailed information on mineralized structures, mCT scans of unstained specimens usually provide little insight into the soft part anatomy of complex organs.…”

Section: Photogrammetry-based Reconstructions Of the Cephalic Lateralmentioning

confidence: 99%

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Form and function of the teleost lateral line revealed using three-dimensional imaging and computational fluid dynamics

Herzog

Klein

Ziegler

2017

J. R. Soc. Interface.

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Fishes sense weak water motion using the lateral line. Among the thousands of described fish species, this organ may differ in size, shape and distribution of individual mechanoreceptors or lateral line canals. The reasons for this diversity remain unclear, but are very likely related to habitat preferences. To better understand the performance of the organ in natural hydrodynamic surroundings, various three-dimensional imaging datasets of the cephalic lateral line were gathered using Leuciscus idus as representative freshwater teleost. These data are employed to simulate hydrodynamic phenomena around the head and within lateral line canals. The results show that changes in canal dimensions alter the absolute stimulation amplitudes, but have little effect on the relation between bulk water flow and higher frequency signals. By contrast, depressions in the skin known as epidermal pits reduce bulk flow stimulation and increase the ratio between higher-frequency signals and the background flow stimulus.

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Histological development and integration of the Zebrafish Weberian apparatus

Bird

Richardson

Abels

2020

Developmental Dynamics

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BackgroundThe Weberian apparatus enhances hearing in otophysan fishes, including Zebrafish (Danio rerio). Several studies have examined aspects of morphological development of the Weberian apparatus and hearing ability in Zebrafish. A comprehensive developmental description including both hard and soft tissues is lacking. This information is critical for both interpretation of genetic developmental analyses and to better understand the role of morphogenesis and integration on changes in hearing ability.ResultsHistological development of hard and soft tissues of the Weberian apparatus, including ossicles, ear, swim bladder, and ligaments are described from early larval stages (3.8 mm notochord length) through adult. Results show a strong relationship in developmental timing and maturation across all regions. All required auditory elements are present and morphologically integrated early, by 6.5 mm SL. Dynamic ossification patterns and changes in shape continue throughout the examined developmental period.ConclusionsThis study provides the first comprehensive histological description of Weberian apparatus development in Zebrafish. Morphological integration was found early, before increases in hearing ability were detected in functional studies (>10 mm total length), suggesting morphological integration precedes functional integration. Further research is needed to examine the nature of the functional delay, and how maturation of the Weberian apparatus influences functionality.

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Comparative development and evolution of two lateral line phenotypes in lake malawi cichlids

Cited by 25 publications

References 29 publications

Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

Heterochrony, modularity, and the functional evolution of the mechanosensory lateral line canal system of fishes

Form and function of the teleost lateral line revealed using three-dimensional imaging and computational fluid dynamics

Histological development and integration of the Zebrafish Weberian apparatus

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