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  • 1
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    Online Resource
    Head shape disparity impacts pollutant accumulation in European eel
    Elsevier BV ; 2018
    In:  Environmental Pollution Vol. 240 ( 2018-09), p. 378-386
    Details
    In: Environmental Pollution, Elsevier BV, Vol. 240 ( 2018-09), p. 378-386
    Type of Medium: Online Resource
    ISSN: 0269-7491
    URL: Article
    DOI: 10.1016/j.envpol.2018.04.128
    RVK:
    AR 10100
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2018
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    detail.hit.zdb_id: 2013037-5
    SSG: 12
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  • 2
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    From yellow to silver: Transforming cranial morphology in European eel ( Anguilla anguilla )
    Wiley ; 2020
    In:  Journal of Anatomy Vol. 237, No. 5 ( 2020-11), p. 979-987
    Details
    In: Journal of Anatomy, Wiley, Vol. 237, No. 5 ( 2020-11), p. 979-987
    Abstract: The European eel ( Anguilla anguilla ) has been extensively studied, especially because of its highly specialized migratory behaviour associated with substantial phenotypic transformations. During this migration, one of those transformations the eel undergoes is from yellow to silver eel, a process known as silvering. Although the cranial morphology during the earlier glass, elver and yellow eel stages are well studied, little is known about actual morphological changes during the transformation process from the yellow to the silver eel stage. Yet, literature suggests drastic changes in musculoskeletal anatomy. Here, we investigated the cranial musculoskeletal morphology of 11 male European eels at different stages during silvering, resulting both from natural and artificial maturation. Using 3D‐reconstructed µCT data of the head, the skull and cranial muscles associated with jaw closing and respiration were studied. Eye size was used as a proxy for the silvering stage. Size‐adjusted jaw muscle volumes increased during silvering, although insignificantly. Accordingly, a near‐significant increase in bite force was observed. Respiratory muscles size did increase significantly during silvering, however. Considering the eel's long migration, which often includes deep and thus potentially oxygen‐poor environments, having a better performing respiratory system may facilitate efficient migration. Both overall skull dimensions and specifically orbit size increased with eye index, suggesting they play a role in accommodating the enlarging eyes during silvering. Finally, artificially matured eels had a wider and taller skull, as well as larger jaw muscles than wild silver eels. This could be caused (a) by different conditions experienced during the yellow eel stage, which are maintained in the silver eel stage, (b) by side effects of hormonal injections or (c) be part of the maturation process as artificially induced silver eels had a higher eye index than the wild silver eels.
    Type of Medium: Online Resource
    ISSN: 0021-8782 , 1469-7580
    URL: Issue
    URL: Article
    DOI: 10.1111/joa.v237.5
    DOI: 10.1111/joa.13259
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 1474856-3
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  • 3
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    Skeletal deformities in gilthead seabream (Sparus aurata): exploring the association between mechanical loading and opercular deformation
    Royal Belgian Institute of Natural Sciences (RBINS) ; 2023
    In:  Belgian Journal of Zoology Vol. 153 ( 2023-07-20)
    Details
    In: Belgian Journal of Zoology, Royal Belgian Institute of Natural Sciences (RBINS), Vol. 153 ( 2023-07-20)
    Abstract: Fish aquaculture is frequently confronted with skeletal abnormalities. In gilthead seabream (Sparus aurata (Linnaeus, 1758)), opercular deformities are one of the most common types of deformities. Many studies point at potential causal factors, mainly genetic or nutritional. However, no clear consensus has surfaced yet, and other factors known to affect bone formation remain unexplored, including mechanical stressors by external forces or muscle contraction. In this study, we investigated whether an altered mechanical use of the gill cover could be associated with opercular deformities, by inducing a change in the respiratory rate and thus gill ventilation. Juvenile seabreams were reared under 80, 100 or 200% dissolved oxygen (DO) to trigger altered respiration behaviour, and the effect on body and opercular shape was analysed. The main hypothesis was that hypoxic conditions would increase opercular ventilation, which would result in a higher prevalence of opercular deformities. The results show that the hypoxic condition (80% DO) did not trigger a significantly higher prevalence of opercular deformations, though the opposite is true for the hyperoxic condition (200% DO). No effect of oxygen treatment was observed on overall body shape, though deformed opercles showed a pronounced, but non-significant difference in shape across treatments. Morphometric results and µCT scans reveal that deformations mainly occur in the dorsocaudal region of the opercular bone. Although no causal link could be demonstrated, we discuss how these results can indirectly suggest that an altered mechanical loading on the operculum could explain its deformation.
    Type of Medium: Online Resource
    ISSN: 2295-0451
    URL: Article
    DOI: 10.26496/bjz.2023.110
    Language: Unknown
    Publisher: Royal Belgian Institute of Natural Sciences (RBINS)
    Publication Date: 2023
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  • 4
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    Pisodonophis boro (ophichthidae: anguilliformes): Specialization for head‐first and tail‐first burrowing?
    Wiley ; 2007
    In:  Journal of Morphology Vol. 268, No. 2 ( 2007-01), p. 112-126
    Details
    In: Journal of Morphology, Wiley, Vol. 268, No. 2 ( 2007-01), p. 112-126
    Abstract: The rice paddy eel, Pisodonophis boro (P. boro) , is of special interest because of its peculiar burrowing habits. P. boro penetrates the substrate tail‐first, a technique common for ophichthids, but it is able to burrow head‐first as well. P. boro exhibits three feeding modes: inertial feeding, grasping, and spinning. Rotational feeding is a highly specialized feeding mode, adopted by several elongate, aquatic vertebrates and it is likely that some morphological modifications are related to this feeding mode. The detailed morphology of the head and tail of P. boro is examined with the goal to apportion the anatomical specializations among head‐first burrowing, tail‐first burrowing, and rotational feeding. The reduced eyes, covered with thick corneas may be beneficial for protection during head‐first burrowing, but at the same time decreased visual acuity may have an impact on other sensory systems (e.g. cephalic lateral line system). The elongated and pointed shape of the skull is beneficial for substrate penetration. The cranial bones and their joints, which are fortified, are advantageous for resisting high mechanical loads during head‐first burrowing. The aponeurotic connection between epaxial and jaw muscles is considered beneficial for transferring these forces from the body to the head during rotational feeding. Hypertrophied jaw muscles facilitate a powerful bite, which is required to hold prey during spinning movements and variability in the fiber angles of subdivisions of jaw muscles may be beneficial for preventing the lower jaw from being dislodged or opened. Furthermore, firm upper (premaxillo–ethmovomerine complex) and lower jaws (with robust coronoid processes) and high neurocranial rigidity are advantageous for a solid grip to hold prey during rotational feeding. The pointed shape of the tail and the consolidated caudal skeleton are beneficial for their tail‐first burrowing habits. It is quite likely that the reduction of the caudal musculature is related to the tail‐first burrowing behavior because the subtle movements of the caudal fin rays are no longer required. J. Morphol., 2007. © 2007 Wiley‐Liss, Inc.
    Type of Medium: Online Resource
    ISSN: 0362-2525 , 1097-4687
    URL: Issue
    URL: Article
    DOI: 10.1002/jmor.v268:2
    DOI: 10.1002/jmor.10507
    Language: English
    Publisher: Wiley
    Publication Date: 2007
    detail.hit.zdb_id: 1479991-1
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  • 5
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    Morphological and histological characterization of an ectopically mineralized structure in a gilthead sea bream Sparus aurata with opercular deformation
    Wiley ; 2019
    In:  Journal of Fish Diseases Vol. 42, No. 9 ( 2019-09), p. 1259-1270
    Details
    In: Journal of Fish Diseases, Wiley, Vol. 42, No. 9 ( 2019-09), p. 1259-1270
    Abstract: In this study, we describe an abnormal ectopically mineralized structure (EMS) that was found inside the skull of a juvenile Sparus aurata that also showed a bilateral opercular deformation. The overall phenotype and tissue composition were studied using micro‐CT scanning and histological analyses. The ectopic structure occupies a large volume of the brain cavity, partially extruding into the gill cavity. It shows a dense mineralization and an extracellular matrix‐rich phenotype, with variation in both the morphology and size of the cell lacunae, combined with an irregular fibre organization inside the matrix. This study is the first to report such an EMS in a juvenile teleost fish, where the tissue does not resemble any other connective tissue type described in bony fish so far. The tissue phenotype seems to rule out that the EMS corresponds to a tumorous cartilage. Yet, it is rather reminiscent of a highly mineralized structure found in cartilaginous fish, where it is suggested to be associated with damage repair.
    Type of Medium: Online Resource
    ISSN: 0140-7775 , 1365-2761
    URL: Issue
    URL: Article
    DOI: 10.1111/jfd.v42.9
    DOI: 10.1111/jfd.13044
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 432109-1
    detail.hit.zdb_id: 2020444-9
    SSG: 21,3
    SSG: 12
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  • 6
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    Comprehensive prediction of robust synthetic lethality between paralog pairs in cancer cell lines
    Elsevier BV ; 2021
    In:  Cell Systems Vol. 12, No. 12 ( 2021-12), p. 1144-1159.e6
    Details
    In: Cell Systems, Elsevier BV, Vol. 12, No. 12 ( 2021-12), p. 1144-1159.e6
    Type of Medium: Online Resource
    ISSN: 2405-4712
    URL: Article
    DOI: 10.1016/j.cels.2021.08.006
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2854138-8
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  • 7
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    Is variation in tail vertebral morphology linked to habitat use in chameleons?
    Wiley ; 2020
    In:  Journal of Morphology Vol. 281, No. 2 ( 2020-02), p. 229-239
    Details
    In: Journal of Morphology, Wiley, Vol. 281, No. 2 ( 2020-02), p. 229-239
    Abstract: Chameleons (Chamaeleonidae) are known for their arboreal lifestyle, in which they make use of their prehensile tail. Yet, some species have a more terrestrial lifestyle, such as Brookesia and Rieppeleon species, as well as some chameleons of the genera Chamaeleo and Bradypodion. The main goal of this study was to identify the key anatomical features of the tail vertebral morphology associated with prehensile capacity. Both interspecific and intra‐individual variation in skeletal tail morphology was investigated. For this, a 3D‐shape analysis was performed on vertebral morphology using μCT‐images of different species of prehensile and nonprehensile tailed chameleons. A difference in overall tail size and caudal vertebral morphology does exist between prehensile and nonprehensile taxa. Nonprehensile tailed species have a shorter tail with fewer vertebrae, a generally shorter neural spine and shorter transverse processes that are positioned more anteriorly (with respect to the vertebral center). The longer tails of prehensile species have more vertebrae as well as an increased length of the processes, likely providing a greater area for muscle attachment. At the intra‐individual level, regional variation is observed with more robust proximal tail vertebrae having longer processes. The distal part has relatively longer vertebrae with shorter processes. Although longer, the small size and high number of the distal vertebrae allows the tail to coil around perches.
    Type of Medium: Online Resource
    ISSN: 0362-2525 , 1097-4687
    URL: Issue
    URL: Article
    DOI: 10.1002/jmor.v281.2
    DOI: 10.1002/jmor.21093
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 1479991-1
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  • 8
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    The anatomy of the head muscles in caecilians (Amphibia: Gymnophiona): Variation in relation to phylogeny and ecology?
    Wiley ; 2023
    In:  Journal of Anatomy Vol. 242, No. 2 ( 2023-02), p. 312-326
    Details
    In: Journal of Anatomy, Wiley, Vol. 242, No. 2 ( 2023-02), p. 312-326
    Abstract: In limbless fossorial vertebrates such as caecilians (Gymnophiona), head‐first burrowing imposes severe constraints on the morphology and overall size of the head. As such, caecilians developed a unique jaw‐closing system involving the large and well‐developed m. interhyoideus posterior , which is positioned in such a way that it does not significantly increase head diameter. Caecilians also possess unique muscles among amphibians. Understanding the diversity in the architecture and size of the cranial muscles may provide insights into how a typical amphibian system was adapted for a head‐first burrowing lifestyle. In this study, we use dissection and non‐destructive contrast‐enhanced micro‐computed tomography (μCT) scanning to describe and compare the cranial musculature of 13 species of caecilians. Our results show that the general organization of the head musculature is rather constant across extant caecilians. However, the early‐diverging Rhinatrema bivittatum mainly relies on the ‘ancestral’ amphibian jaw‐closing mechanism dominated by the m. adductores mandibulae , whereas other caecilians switched to the use of the derived dual jaw‐closing mechanism involving the additional recruitment of the m. interhyoideus posterior . Additionally, the aquatic Typhlonectes show a greater investment in hyoid musculature than terrestrial caecilians, which is likely related to greater demands for ventilating their large lungs, and perhaps also an increased use of suction feeding. In addition to three‐dimensional interactive models, our study provides the required quantitative data to permit the generation of accurate biomechanical models allowing the testing of further functional hypotheses.
    Type of Medium: Online Resource
    ISSN: 0021-8782 , 1469-7580
    URL: Issue
    URL: Article
    DOI: 10.1111/joa.v242.2
    DOI: 10.1111/joa.13763
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 1474856-3
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  • 9
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    Structural tissue organization in the beak of Java and Darwin's finches
    Wiley ; 2012
    In:  Journal of Anatomy Vol. 221, No. 5 ( 2012-11), p. 383-393
    Details
    In: Journal of Anatomy, Wiley, Vol. 221, No. 5 ( 2012-11), p. 383-393
    Type of Medium: Online Resource
    ISSN: 0021-8782
    URL: Issue
    URL: Article
    DOI: 10.1111/joa.2012.221.issue-5
    DOI: 10.1111/j.1469-7580.2012.01561.x
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 1474856-3
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  • 10
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    Is vertebral shape variability in caecilians (Amphibia: Gymnophiona) constrained by forces experienced during burrowing?
    The Company of Biologists ; 2022
    In:  Journal of Experimental Biology Vol. 225, No. 12 ( 2022-06-15)
    Details
    In: Journal of Experimental Biology, The Company of Biologists, Vol. 225, No. 12 ( 2022-06-15)
    Abstract: Caecilians are predominantly burrowing, elongate, limbless amphibians that have been relatively poorly studied. Although it has been suggested that the sturdy and compact skulls of caecilians are an adaptation to their head-first burrowing habits, no clear relationship between skull shape and burrowing performance appears to exist. However, the external forces encountered during burrowing are transmitted by the skull to the vertebral column, and, as such, may impact vertebral shape. Additionally, the muscles that generate the burrowing forces attach onto the vertebral column and consequently may impact vertebral shape that way as well. Here, we explored the relationships between vertebral shape and maximal in vivo push forces in 13 species of caecilian amphibians. Our results show that the shape of the two most anterior vertebrae, as well as the shape of the vertebrae at 90% of the total body length, is not correlated with peak push forces. Conversely, the shape of the third vertebrae, and the vertebrae at 20% and 60% of the total body length, does show a relationship to push forces measured in vivo. Whether these relationships are indirect (external forces constraining shape variation) or direct (muscle forces constraining shape variation) remains unclear and will require quantitative studies of the axial musculature. Importantly, our data suggest that mid-body vertebrae may potentially be used as proxies to infer burrowing capacity in fossil representatives.
    Type of Medium: Online Resource
    ISSN: 0022-0949 , 1477-9145
    URL: Article
    DOI: 10.1242/jeb.244288
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2022
    detail.hit.zdb_id: 1482461-9
    SSG: 12
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