Distribution and ecology of calanoid species in relation to morphometric and chemical characteristics of lakes and ponds of the Northern Apennines (Italy)
AbstractIn 1999 a limnological campaign was carried out in 89 water bodies located in 8 valleys of the Northern Apennines (provinces of Genua, Piacenza, Parma and Reggio Emilia) at an altitude between 877 and 1772 m a.s.l. This survey took into account permanent lakes, but also temporary and ephemeral water bodies which had been scarcely considered in hydrobiological studies previously carried out in this area. Most of the biotopes were visited seasonally during the ice-free period (May - November). The aim of this research was to define the relationships between morphometric features, lithology, hydroperiod and chemical characteristics of the biotopes and the distribution of the three species of calanoid copepods reported in the Northern Apennines, i.e. Mixodiaptomus kupelwieseri, M. tatricus and Eudiaptomus intermedius. The two most common species, M. kupelwieseri and E. intermedius, show an overlap in their altitudinal distribution. However, the former species widely occurs in very shallow, temporary or ephemeral water bodies and the latter clearly prefers permanent, relatively deep waters. Also the water inonic concentration influences the distribution of these two diaptomids, while concentrations of dissolved inorganic nutrients seem to have a negligible effect. Mixodiaptomus tatricus was found only in two shallow ponds beyond 1700 m a.s.l. Co-occurrence of E. intermedius and M. kupelwieseri has been observed only in a pond, but the two species are not found at the same time. The proportion of subitaneous and resting eggs laid in different seasons was analysed in populations of E. intermedius. The voltinism of this species varies according to the duration of the filling period and the productivity of the water bodies. The persistence of diaptomids in the study area has been evaluated through the comparison with distributional data available from the 1950s for most of the permanent lakes and some temporary habitats. Populations appear to be stable over time also in scarcely predictable environments as temporary pools, although in some cases calanoids have disappeared from biotopes severely affected by anthropogenic impacts.
- Abstract views: 1451
- PDF: 585
PAGEPress has chosen to apply the Creative Commons Attribution NonCommercial 4.0 International License (CC BY-NC 4.0) to all manuscripts to be published.
An Open Access Publication is one that meets the following two conditions:
- the author(s) and copyright holder(s) grant(s) to all users a free, irrevocable, worldwide, perpetual right of access to, and a license to copy, use, distribute, transmit and display the work publicly and to make and distribute derivative works, in any digital medium for any responsible purpose, subject to proper attribution of authorship, as well as the right to make small numbers of printed copies for their personal use.
- a complete version of the work and all supplemental materials, including a copy of the permission as stated above, in a suitable standard electronic format is deposited immediately upon initial publication in at least one online repository that is supported by an academic institution, scholarly society, government agency, or other well-established organization that seeks to enable open access, unrestricted distribution, interoperability, and long-term archiving.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.