Habitat fragmentation

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Our landscape is continually being fragmented by the construction of roads, motorways, canals and urban areas leading to the isolation of nature reserves. This affects the dispersal of animals and plants. In order to connect various natural areas, a network known as the “Ecologische Hoofdstructuur” (EHS) is being developed in the Netherlands. Wildlife passages are another example of how barriers can be eliminated.


ITEM: COMMON LIZARD (ZOOTOCA VIVIPARA)

  • Soil analyses in relation to the presence of the Common lizard
    Analysis of soils on nutrient poor heath in comparison with more nutrient rich soils. The Common Lizard declines in the Netherlands. Especially on nutrient poor soils in the south of the Netherlands. But on more nutrient rich soils there seem to be no problems. In this study we investigate if shortage of minerals and/or lime shortage or a one-sided availability of food causes a decline of the Common lizard in certain areas.

    LEVEL: MSc student
    EXTENT OF THE INTERNSHIP: 7 months
    START DATE: March - October
    SUPERVISORS: Raymond Creemers

ITEM: ADDER (VIPERA BERUS)

  • Spring migration and use of hibernacula in vipera berus
    In 2017 distribution of a viper population at the “Zuid-Veluwe” area was studied. Based on this information we want to locate hibernacula sites in the area based on sightings in early spring and late autumn and relate this to the current management in the study area.

    LEVEL: BSc or MSc student
    EXTENT OF THE INTERNSHIP: 9 months
    START DATE: February - October
    SUPERVISORS: Raymond Creemers

ITEM: COMMON SPADEFOOT (PELOBATES FUSCUS)

  • Breeding and reintroduction of Common Spadefoots
    The Common Spadefoot has become very rare in the Netherlands. Because of this sharp decline a program has been initiated that focuses on reintroduction of the species and supplementing existing populations with head started larvae. In the Dutch province Noord-Brabant larvae have been introduced in three areas since 2012 in order to strengthen existing population or establish new ones. The larvae are raised in Artis Zoo (Natura Magistra) in Amsterdam. Raising the delicate larvae is a specialized task and quite laborious. For the period April – July there is a slot open for an enthusiastic intern for both the breeding station at the Zoo and for fieldwork

    LEVEL: Animal husbandry student (no first years); Student must show a high level of independence but must also work in a team. Reliability and sociability are also necessary skills
    EXTENT OF THE INTERNSHIP: 3.5 months
    START DATE: 1 April / 15 July 
    SUPERVISORS: Wilbert Bosman & Richard Struijk and Zoo staff.

  • Breeding success Common Spadefoot
    Reptile, Amphibian and Fish Conservation the Netherlands initiated in 2012 a program focused on the reintroduction of Common Spadefoots in both existing populations and in areas were the species disappeared. Despite restoring and improving terrestrial and breeding habitat the past 10 years some populations did not increase. The goal of this internship are to identify which waters are colonized and if breeding takes place. At the onset of the breeding season (April) you will listen to calling males and later in the season funnel trap are used to catch larvae and determine breeding success.

    LEVEL: BSc or MSc student
    EXTENT OF THE INTERNSHIP: 3 months
    START DATE: March / May 
    SUPERVISOR'S: Wilbert Bosman & Richard Struijk

  • Are populations of the common spadefoot in the Netherlands in a viable state?
    The common spadefoot is one of the most threatened amphibian species of the Netherlands. To remain viable for a period of 100 years a population needs a certain amount of reproductive adults. The common spadefoot lives about two month in his reproductive habitat but 10 month in his terrestrial habitat. Special about the common spadefoot is that is has the ability to dig itself into the soil. Because of that it has special requirements for the terrestrial habitat. In this study we investigate if dutch populations of the common spadefoot have sufficient terrestrial habitat available to be viable.

    LEVEL: BSc or MSc student
    EXTENT OF THE INTERNSHIP: 6 months
    START DATE: March / September
    SUPERVISOR: Wilbert Bosman

  • Reproductive behaviour of the Common spadefoot
    Common spadefoots call under water. That makes it more difficult to hear them and to estimate the numbers that are calling. Surveys for calling activity of the Common spadefoot most of the time starts one hour after sunset. Is this the best moment to investigate calling activity of the Common spadefoot. In 2016 in a pilot we registered calling activity 24 hours a day. We acquired interesting data. In spring 2017 the pilot will be continued to improve the registration method in the vicinity of Nijmegen.

    LEVEL: BSc student
    EXTENT OF THE INTERNSHIP: 5 months
    START DATE: March / July
    SUPERVISOR'S: Wilbert Bosman & Baudewijn Odé


ITEM: GREAT CRESTED NEWT (GREAT CRESTED NEWT)

  • Ecological research on a meta-population of great crested newts
    A metapopulation of great crested newts resides in an area south of the river Waal (Ooijpolder), near the city of Nijmegen in the east of the Netherlands. We would like to know how this population is structured and distributed in this area. This study started in 2011 but in this year many suitable breeding ponds were dry because of low water levels. 

    LEVEL: BSc or MSc student
    EXTENT OF THE INTERNSHIP: 6 months
    START DATE: March/ August
    SUPERVISOR: Wilbert Bosman

  • Ecological study on the Great Crested Newt in the Drents Friese Wold
    Since 2009 we studied 6 areas with big population of the Great Crested Newt. Main goal is to characterize the optimum habitat of this species and based on this information be able to advise how to improve the habitat in an area. The Drents Friese Wold is a heathland with a big population which ecological data we want to add to the dataset.

    LEVEL: BSc or MSc student
    EXTENT OF THE INTERNSHIP: 6 months
    START DATE: February - August
    SUPERVISOR: Wilbert Bosman


ITEM: NEWTS

  • Newts in the Peelhorst area
    In 2017 the relationship was studied between the presence of newts and the water quality of ponds in the Peelhorst area. In 2017 107 ponds were studied on the presence of newts and at the same time water quality was analysed. There seems tob e relationship in nutrient richness of ponds and the presence of certain newt species. In 2018 we want to enlarge the data set with another 100 ponds.

    LEVEL: MSc student
    EXTENT OF THE INTERNSHIP: 7 months
    START DATE: February - August
    SUPERVISOR: Raymond Creemers



ITEM: HERPETOFAUNA: AMPHIBIAN ROAD MITIGATION AND BODY DIMENSIONS


  • Body dimensions and weight Dutch amphibians and reptiles
    What is the average weight of a common toad and what size can great crested newt attain? To date there is no National Database with such information. We are looking for motivated interns that want to dive into this subject. This internship consists of both fieldwork and compiling existing data (literature study).

    LEVEL: BSc student ((basic knowledge of native species necessary)
    EXTENT OF THE INTERNSHIP: Fieldwork during active season of native herpetofauna. Literature study year round.
    START DATE: No fixed period
    SUPERVISOR: Annemarieke Spitzen

  

Internship contact form

Minimaliseren

If you are interested in doing an internship at RAVON or if you have a question about one of the internships please contact our internship coordinator by filling out the form below!

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  RAVON is de kennisorganisatie voor reptielen, amfibieën en vissen. Advies, onderzoek & bescherming.   Telefoon: 024-7410600
Email: kantoor@ravon.nl
Adres: zie contact pagina