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<?php

// modify the main query object
function my_modify_main_query( $query ) {
	if ( $query->is_tax("mavrck_category") && $query->is_main_query() ) { 
		$query->query_vars["posts_per_page"] = 10; 
		$query->query_vars["orderby"] = 'title'; 
		$query->query_vars["order"] = 'ASC'; 
	}
}
// Hook my above function to the pre_get_posts action
add_action( "pre_get_posts", "my_modify_main_query" );

?>