共查询到20条相似文献，搜索用时 15 毫秒
1.
2.
3.
4.
Marisa Naia Virgilio Hermoso Sílvia B. Carvalho José Carlos Brito 《水产资源保护:海洋与淡水生态系统》2021,31(7):1886-1900
- Systematic conservation planning in freshwater ecosystems faces multiple challenges because of the dynamic nature of rivers and their multiple dimensions of connectivity. In intermittent hydrological systems connectivity is functional when water is available, allowing the exchange of aquatic individuals between isolated freshwater ecosystems. Integrating these isolated systems in their hydrological context is essential when identifying priority areas for conservation, in order to try to minimize the propagation of threats into target water bodies (management units) from the surrounding landscape.
- Here, the use of a systematic planning approach is demonstrated to identify a set of priority management units to preserve freshwater biodiversity in an arid system of fragmented water bodies immersed in a landscape subject to a range of impacts.
- Twenty-six water-dependent taxa from 59 mountain rock pools (gueltas) of three southern Mauritanian mountains were used as a case study. A conservation planning tool (marxan ) was used to find priority conservation areas to integrate intermittent hydrological systems in their hydrological context, promote connectivity, and minimize the downstream propagation of threats. Three types of connectivity were analysed: (i) no connectivity, (ii) connectivity between gueltas, and (iii) connectivity between gueltas and sub-catchments.
- Considering different types of longitudinal connectivity affects the number and spatial allocation of the priority gueltas selected, and the conservation status of the gueltas and their upstream areas. Incorporating connections between gueltas and upstream locations in the modelling resulted in the selection of gueltas in areas with a low human footprint and in the increased connectivity of the solutions.
- The results obtained revealed important locations for local biodiversity conservation, and the method presented can be used when assessing the propagation of potential waterborne threats into isolated management units. The framework developed allows connectivity to be addressed in conservation planning. It can be replicated in regions with similar isolated habitats that connect through intermittent hydrological systems and can also be applied to lateral and vertical hydrological connectivity.
5.
6.
7.
Pedro Abellán David Sánchez‐Fernández Josefa Velasco Andrés Millán 《水产资源保护:海洋与淡水生态系统》2007,17(4):361-374
- 1. Biodiversity is probably at greater risk in freshwater systems than in other ecosystems. Although protected areas (PAs) play a vital role in the protection of biodiversity and are the mainstay of most conservation polices, the coverage of biodiversity by existing PA networks is often inadequate and few reserves are created that take into consideration freshwater biota.
- 2. In this paper an attempt is made to address the performance of protected areas in the context of freshwater biodiversity conservation using data records for water beetles in a Mediterranean river basin.
- 3. Although the present PAs in the study area cover a relatively high number of water beetle species, the distribution and extent of reserves is still inadequate or insufficient to protect freshwater biodiversity, especially species of conservation concern.
- 4. Alternative area‐selection methods (hotspots and complementary) were more efficient than PAs for representing water beetles. Within these, complementarity was the most efficient approach, and was able to represent all species in a significantly lower area than the current PA network. On the other hand, the future Natura 2000 Network will result in a great increase in the total area of protected land as well as in the biodiversity represented.
- 5. Unfortunately, the occurrence of a species within a protected area is not a guarantee of long‐term survival because the extent of PAs is often insufficient and disturbances occur outside park boundaries. Thus, whole‐catchment management and natural‐flow maintenance are indispensable strategies for freshwater biodiversity conservation.
8.
9.
10.
The Alliance for Freshwater Life: A global call to unite efforts for freshwater biodiversity science and conservation 
下载免费PDF全文
下载免费PDF全文 William Darwall Vanessa Bremerich Aaike De Wever Anthony I. Dell Jörg Freyhof Mark O. Gessner Hans‐Peter Grossart Ian Harrison Ken Irvine Sonja C. Jähnig Jonathan M. Jeschke Jessica J. Lee Cai Lu Aleksandra M. Lewandowska Michael T. Monaghan Jens C. Nejstgaard Harmony Patricio Astrid Schmidt‐Kloiber Simon N. Stuart Michele Thieme Klement Tockner Eren Turak Olaf Weyl 《水产资源保护:海洋与淡水生态系统》2018,28(4):1015-1022
11.
12.
Joana Garrido Nogueira Amílcar Teixeira Simone Varandas Manuel Lopes-Lima Ronaldo Sousa 《水产资源保护:海洋与淡水生态系统》2021,31(3):520-530
- Freshwater ecosystems are essential to human well-being and most have high biodiversity. However, this biodiversity has been suffering severe declines owing to the expansion of human activities. Protected areas (PAs) are essential for biodiversity conservation and have proved to be successful in stopping species extirpation if managed properly. Unfortunately, they are usually focused on terrestrial biodiversity, leaving freshwater ecosystems aside.
- The main goal of this study was to determine the influence of a PA (Montesinho Natural Park (MNP), Portugal) on freshwater biodiversity. Aquatic macroinvertebrates and fishes were surveyed, and biodiversity (richness, abundance, Shannon-Wiener diversity, and Pielou's evenness) and water quality (IASPT) indices were calculated inside, at the periphery and outside the MNP.
- Results showed that the PA does not affect positively either water quality or the two faunal groups monitored. Macroinvertebrate communities were not influenced by the PA; however, the abundance of pearl mussel Margaritifera margaritifera was significantly higher and size was significantly lower inside the MNP. The richness and abundance of fish communities were significantly higher outside the MNP, except for trout Salmo trutta abundance which was higher inside the MNP.
- Given these results, the MNP does not guarantee the safeguard of overall aquatic biodiversity and habitats and we propose an extension of MNP to downstream areas in order to increase the number of species (mostly cyprinids) under legal protection. This work demonstrates that terrestrial PA planning and management should also consider aquatic biodiversity to achieve successful conservation.
13.
14.
15.
Pter Sly Anna Dolezsai Balzs Andrs Lukcs Gbor Vrbír Tibor Er&#x;s 《水产资源保护:海洋与淡水生态系统》2020,30(2):246-259
- Priority‐area selection is a core phase of systematic conservation planning, often carried out using a single (surrogate) taxon. Efficient surrogates are expected to yield taxonomically representative priority areas that embrace the populations not only of the surrogate but also the surrogated taxa. Compared with the terrestrial realm, surrogacy performance of riverine taxa has received much less attention.
- This study compared the surrogacy performance of fishes (FI), macrophytes (MP), and benthic macroinvertebrates (MI) in terms of total area, connectedness, spatial congruence, and taxonomic representativeness of priority areas in the Middle Danube basin (Hungary). Setting three target values for each surrogate group, nine area prioritization designs were run by using a purpose‐written connectivity‐centric algorithm to emphasize the importance of longitudinal connectivity.
- FI provided the smallest, MP the intermediate, and MI the largest priority areas or solutions. Connectedness was greatest for FI, being one order of magnitude higher than for the other two groups. Pairwise spatial congruence was highest between FI and MP, lowest between MP and MI, and intermediate for FI and MI. MI yielded the most representative solutions, although the number of occurrences of the surrogated taxa in the solution, as a criterion of representation, modified the ratio of the taxa represented. Areas compiled from the overlapping parts of the surrogate‐specific priority sets proved to be smaller than, and similarly representative of, single‐taxon solutions.
- Taxon‐rich groups such as MI can serve as efficient surrogates, but that can result in larger solutions than for less taxon‐rich surrogates. Apart from the size, the compactness of the solutions seems to be determined by the identity of the surrogate taxa, and FI can be alternative surrogates in connectivity‐centric prioritization. At the same time, multi‐group approaches can enhance the robustness of area prioritization in terms of representativeness compared with single‐taxon procedures.
16.
17.
Fish conservation in freshwater and marine realms: status,threats and management 总被引：1，自引：0，他引：1 下载免费PDF全文
下载免费PDF全文 Angela H. Arthington Nicholas K. Dulvy William Gladstone Ian J. Winfield 《水产资源保护:海洋与淡水生态系统》2016,26(5):838-857
- 相似文献
18.
19.