def get_all_species_alive_area(species_list, area):
    """Get all names of species that are alive from a certain area.

    Parameters
    ----------
    species_list : list of strings
        List of all species.

    area : str
        name of area for which the species should be returned.

    Returns
    -------
    numb_total_population_alive : list of strings
        List of all species excluding dead species from the specified area.
    """

    total_population_alive = [
        x for x in species_list.keys() if ("dead" not in x) and (area in x)
    ]
    numb_total_population_alive = "+".join(total_population_alive)
    return numb_total_population_alive