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6 results for “reproductive mode plasticity”
FIGURE 4 in Oviparity, viviparity or plasticity in reproductive mode of the olm Proteus anguinus: an epic misunderstanding caused by prey regurgitation?
FIGURE 4 Proteus anguinus larva (captive-bred from Tular Cave Laboratory, photograph by Gregor Aljančič) and Salamandra salamandra larva in comparison. Both larvae are about 3 cm in size. Note the difference in size and shape of the head and trunk length, but similarities in presence of eyes and pigmentation. PHOTOGRAPH OF proteus anguinus LARVA BY GREGOR ALJANČIČ AND salamandra salamandra LARVA BY JAMES BURGON
FIGURE 3 in Oviparity, viviparity or plasticity in reproductive mode of the olm Proteus anguinus: an epic misunderstanding caused by prey regurgitation?
FIGURE 3 Scanning electron micrographs of the olm's teeth marks on regurgitated salamander (Salamandra salamandra) larvae. Heads of all larvae are facing towards the left. A) Teeth marks (arrowheads) on the dorsal side of the head corresponding to the position of the olm's jaw and B) parallel teeth marks on the left side of the head above the gills (g) of the larvae shown in fig. 2A. C) Teeth marks on the anterior edge of laceration above the left gills (g) and D) above the right eye (e) of the head of the larva shown in fig. 2B and C. (Scale bars represents 500 µm).
FIGURE 1 in Oviparity, viviparity or plasticity in reproductive mode of the olm Proteus anguinus: an epic misunderstanding caused by prey regurgitation?
FIGURE 1 Image of an olm (Proteus anguinus) regurgitating a fire salamander (Salamandra salamandra) larva. A) Image of an olm (22.5 cm of total length), moments before B) it started to regurgitate a salamander larva (3.1 cm of total length). C) shows a close-up of the salamander head and the larva fully regurgitated, with D) showing details of the still alive salamander larva.
Data from: A treefrog with reproductive mode plasticity reveals a changing balance of selection for non-aquatic egg-laying
Non-aquatic reproduction has evolved repeatedly, but the factors that select for laying eggs on land are not well understood. The treefrog Dendropsophus ebraccatus has plasticity in reproductive mode, laying eggs that successfully develop in or out of water. This permits the first experimental comparison of the selective agents that shape adult oviposition behavior and embryo developmental capacity. I quantified the sources and strength of arboreal and aquatic egg mortality, how mortality varies with weather patterns, and assessed 39 years of daily rainfall patterns to infer historic levels of egg mortality and effects of climate change on the selective balance between aquatic and non-aquatic egg deposition. Aquatic predators and desiccation were the strongest selective agents in water and air, respectively. Egg mortality varied with weather such that aquatic oviposition was advantageous when rainfall was low, but laying eggs out of water increased survival when rainfall was high. Additionally, I found that since 1972 there have been significant changes in the patterns of rainfall in central Panama, which has altered the selective landscape acting on egg-laying behavior. This work provides insight into both the evolution and maintenance of adaptive phenotypic plasticity as well as historic and current selection on reproduction.
Data from: A treefrog with reproductive mode plasticity reveals a changing balance of selection for non-aquatic egg-laying
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FIGURE 2 in Oviparity, viviparity or plasticity in reproductive mode of the olm Proteus anguinus: an epic misunderstanding caused by prey regurgitation?
FIGURE 2 Regurgitated salamander (Salamandra salamandra) larvae. The first image A) shows the larva (3.1 cm of total length) still alive after regurgitation with no obvious damage visible; B) shows the second larva (3.2 cm of total length), with heavier damage around the gills. A close-up of the respective damaged area of the C) neck and gills of the larva is shown.
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