COEXISTING POPULATIONS OF ACOMYS CAHIRINUS AND A. RUSSATUS: A PRELIMINARY REPORT
In: Israel Journal of Ecology and EvolutionSearch for other papers by NOGA KRONFELD in
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Two species of the genus Acomys, cahirinus and russatus, co-occur in En Gedi. A. cahirinus is nocturnal, whereas A. russatus is diurnal. This pattern of temporal partitioning has been ascribed to competitive exclusion of A. russatus by A. cahirinus. Study of the ecological basis for this phenomenon and its mechanisms, however, is still required. Here we report preliminary results of long—term research that we undertook in order to establish precise activity patterns, body temperature rhythms, spatial distribution, food habits, and population dynamics of the two species. Population densities of both species are quite low, and much lower than those found in agricultural areas. A. russatus was found mainly in a creek bed strewn with boulders, and also on the hillside among boulders. A. cahirinus appeared to be more evenly distributed, and was found also among smaller rocks; determination of precise spatial distribution patterns, however, requires more thorough study. While A. cahirinus was active almost only during the night, A. russatus was active during the entire day during the winter months. Both species exhibit body temperature rhythms that conform to those expected of a nocturnal rodent; however, A. russatus body temperatures rise earlier (several hours before sunset) and drop later than those of A. cahirinus, and only reach their minimal level several hours after sunrise. This difference may reflect an adaptation to a diurnal activity pattern.
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| All Time | Past 365 days | Past 30 Days | |
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COEXISTING POPULATIONS OF ACOMYS CAHIRINUS AND A. RUSSATUS: A PRELIMINARY REPORT
In: Israel Journal of Ecology and EvolutionSearch for other papers by NOGA KRONFELD in
Current site
Google Scholar
PubMed
Search for other papers by TAMAR DAYAN in
Current site
Google Scholar
PubMed
Search for other papers by NAVA ZISAPEL in
Current site
Google Scholar
PubMed
Search for other papers by ABRAHAM HAIM in
Current site
Google Scholar
PubMed
Two species of the genus Acomys, cahirinus and russatus, co-occur in En Gedi. A. cahirinus is nocturnal, whereas A. russatus is diurnal. This pattern of temporal partitioning has been ascribed to competitive exclusion of A. russatus by A. cahirinus. Study of the ecological basis for this phenomenon and its mechanisms, however, is still required. Here we report preliminary results of long—term research that we undertook in order to establish precise activity patterns, body temperature rhythms, spatial distribution, food habits, and population dynamics of the two species. Population densities of both species are quite low, and much lower than those found in agricultural areas. A. russatus was found mainly in a creek bed strewn with boulders, and also on the hillside among boulders. A. cahirinus appeared to be more evenly distributed, and was found also among smaller rocks; determination of precise spatial distribution patterns, however, requires more thorough study. While A. cahirinus was active almost only during the night, A. russatus was active during the entire day during the winter months. Both species exhibit body temperature rhythms that conform to those expected of a nocturnal rodent; however, A. russatus body temperatures rise earlier (several hours before sunset) and drop later than those of A. cahirinus, and only reach their minimal level several hours after sunrise. This difference may reflect an adaptation to a diurnal activity pattern.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 286 | 31 | 0 |
| Full Text Views | 23 | 0 | 0 |
| PDF Views & Downloads | 28 | 0 | 0 |
