This study investigates five methods for recording the presence and population growth of water shrews. In order to assist with conservation and protection efforts, the study authors identify which are the most accurate methods.

From Report Summary:

“In order to protect any species effectively, one has to know where they occur. Water shrews (Neomys fodiens) present considerable problems for those attempting to investigate changes in their distribution as, although the species is widespread it is patchily distributed and some populations may be ephemeral.”

“The methods/techniques investigated comprised standard Longworth traps, feeding tubes and three types of refugia similar to those used in herpetological surveys. All materials were baited and visited three times during each 24 hour period to record all small mammals by direct observation (of animals captured in Longworth traps or disturbed under refugia) and by collection and analysis of droppings.”

“The survey showed that metal refugia had the highest use by water shrews and were significantly more effective than other refugia materials, feeding tubes or Longworth traps. The latter were, however, still the most useful technique where a complete record of all mammal species present was required.”