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Ambystoma maculatum population structure

A

alan

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http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-294X.2006.03139.x
Molecular Ecology
Fine-scale spatial genetic structure and dispersal among spotted salamander (Ambystoma maculatum) breeding populations.
Abstract:
We examined fine-scale genetic variation among breeding aggregations of the spotted salamander (Ambystoma maculatum) to quantify dispersal, interpopulation connectivity and population genetic structure. Spotted salamanders rely on temporary ponds or wetlands for aggregate breeding. Adequate breeding sites are relatively isolated from one another and field studies suggest considerable adult site fidelity; therefore, we expected to find population structure and differentiation at small spatial scales. We used microsatellites to estimate population structure and dispersal among 29 breeding aggregations in Tompkins County, New York, USA, an area encompassing 1272 km2. Bayesian and frequency-based analyses revealed fine-scale genetic structure with two genetically defined demes: the North deme included seven breeding ponds, and the South deme included 13 ponds. Nine ponds showed evidence of admixture between these two genetic pools. Bayesian assignment tests for detection of interpopulation dispersal indicate that immigration among ponds is common within demes, and that certain populations serve as sources of immigrants to neighbouring ponds. Likewise, spatial genetic correlation analyses showed that populations ² 4.8 km distant from each other show significant genetic correlation that is not evident at higher scales. Within-population levels of relatedness are consistently larger than expected if mating were completely random across ponds, and in the case of a few ponds, within-population processes such as inbreeding or reproductive skew contribute significantly to differentiation from neighbouring ponds. Our data underscore the importance of these within-population processes as a source of genetic diversity across the landscape, despite considerable population connectivity. Our data further suggest that spotted salamander breeding groups behave as metapopulations, with population clusters as functional units, but sufficient migration among demes to allow for potential rescue and recolonization. Amphibian habitats are becoming increasingly fragmented and a clear understanding of dispersal and patterns of population connectivity for taxa with different ecologies and life histories is crucial for their conservation.
 
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    yeah, im heading over tomorrow morning to move him to this house and feed him. Thanks for the help!
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  • Shane_Yogurt:
    So my axolotl tank cycle just crashed and while i was in the middle of a water change my bucket overflowed and spilled water all of the ground in my brand new home. This is going super well 👍
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    ooff
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    good luck recycling the tank!
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    nevermind! off my game tonight
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  • Shane_Yogurt:
    Im so frustrated right now. My axolotl WONT eat and my tank still isnt looking too good. Some extra stress i needed.
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  • John:
    Sorry to hear that Shane. Did you post about it?
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  • Shane_Yogurt:
    No, I havent. Im not really sure why he wont eat. Hes in a 1 gallon tub and still a juvenile. When i offer food he swims away from it. Does he need some extra time? or is this something I should be worried about.
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  • JulMl:
    Hello everyone! I’m new in this world and i need some advices please! I have 2 axolotl babies and currently the water from the tank is from bottled water ( all parameters are good) but i want to change 50% of the water with city tap water. My question is how to change it? Do i need to get axis out, do the change, add the prime, wait (how much?) until its dechlorinated or i can add the tap water directly into the tank with axis in it, and add the prime conditioner? Thank you!!
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  • Asmold1:
    1. You dont need to take them out of the tank to change the water as long as you pour it in slow as to not rattle them around too much
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  • Asmold1:
    2. add the prime to your tap water, for most conditioners the consensus is 5 minutes of waiting time
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  • Asmold1:
    3.After 5 minutes it should be safe to add
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  • JulMl:
    Thank you so much !!
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  • Asmold1:
    I private messaged you a bit clearer instructions just in case
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    Where can I get blackworms?
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    Ebay or Eastern Aquatics
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    Does anyone know someone who can ship axolotls to hawaii? I recently did a water change and my axolotl died and there are no axos for sale right now.
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  • Sylvia88:
    Hello I'm wondering if fridging axolotl is necessary when giving it a salt bath? My fridge is unpredictable it just changes from freezing temperature to melting by itself. And driving me crazy. So I would not be keen to put my axie in these because of the sudden temperature changes it may experience. Can I leave him in a clean dechlorinated water tub in some of the room? Would I then need to refrigerate the salt water ? Or would I just keep it in a same room temperature?! I have everything ready for him to get a salt bath but just wanted to check about this fridging before I do ( waited for approval to join the forum:)
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  • Sylvia88:
    FYI I noticed a white fluffy strings on his gills yesterday. And looking through the forum and some pictures it looks like fungus .
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    Sylvia88: FYI I noticed a white fluffy strings on his gills yesterday. And looking through the forum and... +1
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