Bioloxía Funcionalhttp://hdl.handle.net/10347/29152024-03-29T05:16:30Z2024-03-29T05:16:30ZSpecies range size shapes distance-decay in community similarityMartín Devasa, Ramiro MaríaMartínez Santalla, SaraGómez Rodríguez, CarolaCrujeiras Casais, Rosa MaríaBaselga Fraga, Andréshttp://hdl.handle.net/10347/332592024-03-22T01:02:56Z2022-01-01T00:00:00ZSpecies range size shapes distance-decay in community similarity
Martín Devasa, Ramiro María; Martínez Santalla, Sara; Gómez Rodríguez, Carola; Crujeiras Casais, Rosa María; Baselga Fraga, Andrés
Aim: (i) To assess the dependence between the form of the decrease in biological
similarity with distance (distance-decay) and species range size and (ii) to introduce
the use of a sigmoidal model, the Gompertz function, as a flexible alternative able to
fit distance-decay models under a wide variety of species range sizes.
Location: Applicable worldwide.
Methods: We computed distance-decay curves from simulated communities to assess
how the species range sizes shape the functional form of distance-decay patterns (i.e.
negative exponential, power-law or sigmoidal [Gompertz] relationships). Simulations
were performed using different sample sizes and species detection probabilities. We
also used distribution data of South American mammals to explore the relationship
between species range size and the distance-decay form in an empirical dataset.
Results: Our simulations showed that the power-law is the best supported model
when range sizes tend to be small. An increase in range sizes leads to a negative expo-
nential relationship, taking the shape of a sigmoidal (Gompertz) relationship with the
largest range size values. Similar results have been found in the distance-decay pat-
tern of South American mammals. Remarkably, the Gompertz function fits the data
reasonably well in all scenarios.
Main conclusions: The functional form of distance-decay patterns depends on a key
biogeographical attribute: species range size. This dependence makes it an interest-
ing tool to detect biodiversity threats associated with species range expansion, such
as the biotic homogenization of faunas. The Gompertz function is the mathemati-
cal model that best accommodates different frequency distributions of species range
size and, thus, allows cross-taxa comparison of this biogeographical and ecological
pattern.
2022-01-01T00:00:00ZAre the invasive Acacia melanoxylon and Eucalyptus globulus drivers of other species invasion? Testing their allelochemical effects on germinationFernández Riveiro, SheilaCruz de la Fuente, ÓscarReyes Ferreira, Otiliahttp://hdl.handle.net/10347/332542024-03-21T09:21:43Z2023-01-01T00:00:00ZAre the invasive Acacia melanoxylon and Eucalyptus globulus drivers of other species invasion? Testing their allelochemical effects on germination
Fernández Riveiro, Sheila; Cruz de la Fuente, Óscar; Reyes Ferreira, Otilia
Many invasive alien species (IAS) produce secondary metabolites that affect how other plants function (allelopathic compounds) and can drive other species invasion, as proposed by the invasional meltdown hypothesis. Acacia melanoxylon and Eucalyptus globulus are two of such species. In this study, we analyzed the germination response of seven IAS (Acacia dealbata, Acacia mearnsii, Acacia melanoxylon, Acacia longifolia, Eucalyptus globulus, Paraserianthes lophantha, Phytolacca americana) and a native biotest species (Lactuca sativa) to the application of two different aqueous extracts at two different concentrations of donor species A. melanoxylon and E. globulus. Extract compounds were identified by UHPLC-ESI-QTOF-MS. Eucalyptus aqueous extracts significantly reduced germination in three species (A. dealbata, E. globulus, P. americana). The germination of all the species tested was reduced with acacia aqueous extracts. Our results support the postulates of the Biochemical Recognition Hypothesis in that seeds gauge establishment potential based on phytochemical release of other plants. Furthermore, A. melanoxylon and E. globulus lowered their own germination, suggesting that these species exhibit intraspecific biochemical recognition. We also found support for the Novel Weapons Hypothesis in the case of L. sativa as a native species. Our research shows that phytochemicals are a component of plant-plant interactions, including the invasion process.
2023-01-01T00:00:00ZPredicting the spatio-temporal pattern of range expansion under lack of equilibrium with climateFormoso Freire, VictoriaBarbosa, A. MárciaBaselga Fraga, AndrésGómez Rodríguez, Carolahttp://hdl.handle.net/10347/329552024-03-21T09:21:43Z2023-01-01T00:00:00ZPredicting the spatio-temporal pattern of range expansion under lack of equilibrium with climate
Formoso Freire, Victoria; Barbosa, A. Márcia; Baselga Fraga, Andrés; Gómez Rodríguez, Carola
Early detection of invasive species in regions under threat is key for biodiversity conservation. Here we conduct a retrospective study to assess whether correlative Species Distribution Models (SDMs) can predict the spatio-temporal range of expansion in an invasive species, the Asian hornet. Given that modelling invasive species distributions defies one of the main assumptions of SDMs, the equilibrium with climate, we also introduce a quantitative assessment of climatic disequilibrium in the invaded area based on hypervolume comparison between the native and invaded areas (both unoccupied and occupied territories). We evaluate the ability of three different modelling approaches (presence-only, presence-background and presence-absence) calibrated with data until 2013 to predict the species distribution observed the following years (2015, 2017, 2019, and 2021). Our results show that presence-only models based on the BIOCLIM algorithm can effectively predict the spatio-temporal pattern of invasion when predictions are rescaled based on percentiles (i.e. ranked suitability) and the model is calibrated with data from both native and invaded areas. These models predicted higher suitability values for sites that were invaded earlier in time and, importantly, they did not predict low suitability values for sites that were eventually occupied years later. Thus, they can be very useful for decision-makers and managers, as they provide a probabilistic prediction of both (i) the temporal dimension of species range expansion, and (ii) the potential distribution range in the long term. Such information would allow prioritizing monitoring efforts in the short term without losing sight of the potential risks in the long term
2023-01-01T00:00:00ZRecent histories of six productive lakes in the Irish Ecoregion based on multiproxy palaeolimnological evidenceTaylor, D.Dalton, C.Leira, ManelJordan, P.Chen, G.León-Vintró, LuisIrvine, K.Bennion, H.Nolan, T.http://hdl.handle.net/10347/328262024-02-15T01:03:04Z2006-01-01T00:00:00ZRecent histories of six productive lakes in the Irish Ecoregion based on multiproxy palaeolimnological evidence
Taylor, D.; Dalton, C.; Leira, Manel; Jordan, P.; Chen, G.; León-Vintró, Luis; Irvine, K.; Bennion, H.; Nolan, T.
Palaeolimnological data from six mesotrophic, eutrophic and hypertrophic lakes in the Irish Ecoregion, in the form of microfossil (cladocera, diatoms and pollen) and sediment chemistry data from radiometrically dated sediment cores, were used to reconstruct past variations in lake water quality and catchment conditions. Basal sediments from sediment cores from the six sites ranged in age from the late 18th century to the early 20th century. A weighted averaging partial least squares regression model was developed to reconstruct past epilimnetic total phosphorus concentrations. The results indicate that all but one of the study sites currently are in a far more productive state compared with the beginning of the sediment core record and that those same five lakes have experienced accelerated enrichment post c. 1980. Two of the sites demonstrated long-term enrichment, in one case beginning in the late 19th century, while both eutrophication and oligotrophication have occurred at three sites. The results highlight the difficulties in applying a general temporal end-point for reference conditions and demonstrate that productive lakes in the Irish Ecoregion have complex, locally specific and often long histories of enrichment. These may not be responsive to reduced external loadings of phosphorus and, as a result, restoration could prove particularly challenging. The results also provide evidence of the ways in which palaeolimnological techniques can assist implementation of the EU Water Framework Directive.
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s10750-006-0243-8
2006-01-01T00:00:00Z