n African Zoology - Migration of the freshwater crab in a seasonal stream, Zimbabwe

Volume 39, Issue 1
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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The potamodromous migration patterns of <I>Potamonautes unispinus&lt;/I&gt; are described in a seasonal dambo stream on the Zimbabwean highveld. After the first rains in November, crabs moved upstream, most crabs in this initial migration were females carrying either eggs or young crabs under their flexed abdomens. The stream dried up briefly after the start of flow, and some crabs moved downstream in the dry riverbed at this time, but the general upstream movement resumed when the river began to flow again later in the season. The subsequent upstream movement included a larger proportion of females without young, males and juvenile crabs. The apparent breeding season was short, lasting from late November to late January. Some of the adult and juvenile crabs migrated downstream in April when temperatures declined, even though river levels were high.

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