How to add/remove Vector Layer from a Map

I have doubts about how to show or hide a vector layer on the map once I have created it. I generate it after doing a php query and receiving the data in json.
This is the function that I use to send the data to the query and once the json is received I paint it on the map:

function search(){
    var element = document.getElementById("formName");
    obje = document.getElementById('cbx_esp');
    var txt='';
    txt = """+obje.value+""";
    url_obje = 'abundance='+txt;
    drawAbundance(obje.value);
}
function drawAbundance(cbx_espId){
    var vectorAbundance = new ol.source.Vector({
        format: new  ol.format.GeoJSON(),
        loader: function(extent, resolution, projection) {
            var proj = projection.getCode();
            var url = "obAbundance.php"
            var xhr = new XMLHttpRequest();

            var params = {
                abundance: cbx_espId
            }

            xhr.open('POST', url);
            xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
            var onError = function() {
               vectorAbundance.removeLoadedExtent(extent);
            }
            xhr.onerror = onError;
            xhr.onload = function() {
                xhr.responseText;
                console.log(xhr.responseText);
                if (xhr.status == 200) {
                    vectorAbundance.addFeatures(
                        vectorAbundance.getFormat().readFeatures(xhr.responseText)
                    );
                    map.getView().fit(vectorAbundance.getExtent());
                    $("#formName")[0].reset();
               } else {
                 onError();
               }
             }
             xhr.send(JSON.stringify(params));
        },
    });
    var vectorlayer = new ol.layer.Vector({
        source:vectorAbundance,
        visible:true,
        displayInLayerSwitcher: false,
        style: distICES,                
    });

    map.addLayer(vectorlayer)
}

//I tried this to show or not the veclayer
function add_de(e){
    if(e.checked){
        map.addLayer(vectorlayer);
    }else{
        map.removelayer(vectorlayer);
    }
}

I tried to create an input check and depending on whether it was checked or not, the vector layer was loaded, but it gives me the error that it is not defined:

Uncaught ReferenceError: vectorlayer is not defined

function search(){
    var element = document.getElementById("formName");
    obje = document.getElementById('cbx_esp');
    var txt='';
    txt = """+obje.value+""";
    url_obje = 'abundance='+txt;
    drawAbundance(obje.value);
}

var vectorlayer;

function drawAbundance(cbx_espId){
    var vectorAbundance = new ol.source.Vector({
        format: new  ol.format.GeoJSON(),
        loader: function(extent, resolution, projection) {
            var proj = projection.getCode();
            var url = "obAbundance.php"
            var xhr = new XMLHttpRequest();

            var params = {
                abundance: cbx_espId
            }

            xhr.open('POST', url);
            xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
            var onError = function() {
               vectorAbundance.removeLoadedExtent(extent);
            }
            xhr.onerror = onError;
            xhr.onload = function() {
                xhr.responseText;
                console.log(xhr.responseText);
                if (xhr.status == 200) {
                    vectorAbundance.addFeatures(
                        vectorAbundance.getFormat().readFeatures(xhr.responseText)
                    );
                    map.getView().fit(vectorAbundance.getExtent());
                    $("#formName")[0].reset();
               } else {
                 onError();
               }
             }
             xhr.send(JSON.stringify(params));
        },
    });
    vectorlayer = new ol.layer.Vector({
        source:vectorAbundance,
        visible:true,
        displayInLayerSwitcher: false,
        style: distICES,                
    });

    map.addLayer(vectorlayer)
}

//I tried this to show or not the veclayer
function add_de(e){
    if(e.checked){
        map.addLayer(vectorlayer);
    }else{
        map.removelayer(vectorlayer);
    }
}