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  1. Article ; Online: Demographic monitoring of the invasive ladder snake on Formentera (Balearic Islands, Spain)

    Febrer‐Serra, M. / Lassnig, N. / Colomar, V. / Picó, G. / Sureda, A. / Pinya, S.

    Journal of Zoology. 2023 July, v. 320, no. 3, p. 236-247

    2023  , Page(s) 236–247

    Abstract: The ladder snake Zamenis scalaris was first reported in 2006 in Formentera (Balearic Islands, Spain), until then a snake‐free Mediterranean island. Since 2016, intense control campaigns have been carried out and, for the first time, snake captures over ... ...

    Abstract The ladder snake Zamenis scalaris was first reported in 2006 in Formentera (Balearic Islands, Spain), until then a snake‐free Mediterranean island. Since 2016, intense control campaigns have been carried out and, for the first time, snake captures over 2017–2020 have been used to analyze the sex ratio, age, fat percentage, population density, and seasonality of this invasive population. The male‐biased sex ratio found in the present work could be the result of capture biases caused by different detection probabilities between sexes. A reduction of snake body length over time was observed, which could indicate a depletion of the larger snakes due to intense snake capture. The highest capture frequencies of both sexes were reported in May and June, coinciding with the mate searching period in the species native range and indicating that snakes increase their movements during this period. Size‐specific survivorship curves indicated a drop in survivorship at medium sizes, which suggested a survival cost associated with reproduction, presumably due to increased mortality during the mating season. Population density decreased from 1.812 snakes/ha in 2017 to 0.669 snakes/ha in 2020. Evidence obtained in the present work has allowed to evaluate the main ecological aspects of Z. scalaris and the current state of the population of this invasive snake on the island of Formentera. Results showed that the population is well established in Formentera, but prolonged control campaigns have caused its decline. This study becomes a starting point to improve the management and control programs of invasive snake populations in the Balearic Islands. Long‐term control as well as the improvement of the detection and capture of adult females are strongly recommended to attempt the eradication of Z. scalaris in Formentera.
    Keywords adults ; body length ; invasive species ; population density ; reproduction ; sex ratio ; snakes ; survival rate ; zoology ; Spain
    Language English
    Dates of publication 2023-07
    Size p. 236-247
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 1471807-8
    ISSN 1469-7998 ; 0952-8369
    ISSN (online) 1469-7998
    ISSN 0952-8369
    DOI 10.1111/jzo.13065
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Tail breakage and predatory pressure upon two invasive snakes (Serpentes: Colubridae) at two islands in the Western Mediterranean

    Febrer-Serra, M. / Lassnig, N. / Colomar, V. / Sureda, A. / Pinya, S.

    Canadian journal of zoology. 2021, v. 99, no. 7

    2021  

    Abstract: Tail breakage is an important anti-predator mechanism in snake populations, which can be used as a proxy for predation intensity as natural observations of predator–prey interactions are scarce. Frequency of tail breakage was calculated for two Iberian ... ...

    Abstract Tail breakage is an important anti-predator mechanism in snake populations, which can be used as a proxy for predation intensity as natural observations of predator–prey interactions are scarce. Frequency of tail breakage was calculated for two Iberian colubrids recently introduced in the Balearic Islands (Western Mediterranean, Spain): the Horseshoe Whip Snake (Hemorrhois hippocrepis (Linnaeus, 1758)) in Eivissa and the Ladder Snake (Zamenis scalaris (Schinz, 1812)) in Formentera. The effect of sex, life stage, dorsal coloration pattern, body length, and body condition on frequency of tail breakage and on remaining subcaudal scale pairs were analyzed and compared between the indigenous range and the invaded islands. An increase of the frequency of tail breakage with body size was found, supporting a size-related effect, which also occurs in the indigenous range. Frequency of tail breakage of H. hippocrepis was lower in Eivissa when compared with the original area, whereas in Formentera, Z. scalaris showed a higher frequency, which could be related to the different predator community on each island compared with the mainland. The study of the main ecological aspects of these recently introduced species may allow one to assess their potential impact on insular ecosystems and their indigenous biodiversity, as well as to promote future control actions in these areas previously free of snakes.
    Keywords Colubridae ; biodiversity ; body condition ; body length ; color ; introduced species ; predation ; snakes ; tail ; Spain
    Language English
    Size p. 539-547.
    Publishing place NRC Research Press
    Document type Article
    ZDB-ID 241716-9
    ISSN 1480-3283 ; 0008-4301
    ISSN (online) 1480-3283
    ISSN 0008-4301
    DOI 10.1139/cjz-2020-0261
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    In stock of ZB MED Bonn / Germany

    Z 71/720: Show issues

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  3. Article: Assessment of the invasion process of the common raccoon Procyon lotor (Carnivora: Procyonidae) on a Mediterranean island a decade after its introduction

    Lassnig, N / Colomar, V / Febrer-Serra, M / Perelló, E / Picó, G / Pinya, S / Truyols-Henares, F

    Science of the total environment. 2019 Aug. 28,

    2019  

    Abstract: The common raccoon, Procyon lotor was introduced at the Balearic Islands (Spain) in 2006. Since then, a colonization process has been carried out, with captures of specimens in 24.30% of the surface of the whole Mallorca Island. For the first time, ... ...

    Abstract The common raccoon, Procyon lotor was introduced at the Balearic Islands (Spain) in 2006. Since then, a colonization process has been carried out, with captures of specimens in 24.30% of the surface of the whole Mallorca Island. For the first time, information has been provided on the invasive process of P. lotor in an insular ecosystem. 257 specimens of P. lotor were captured during the period 2007–2018, of them 104 were analysed to estimate population parameters. Demographic data showed that the population had a sex ratio of 1.00:1.21 (males:females), high BMI values and up to 40% of females were lactating when captured. Related to diet data, the composition was mainly the same as previous studies around its natural and introduced distribution area. Plant residues represented the 53.25 ± 38.66% followed by invertebrates with 12.22 ± 22.54%, inorganic remains with 11.9 ± 22.07% and finally the vertebrates with 4.94 ± 18.27%. Thus, it is shown how an opportunistic omnivorous species has adapted to the resources provided by the island. Cultivated plants' remains and plastic content in diet evidence that P. lotor is entering in contact with human settlements and agricultural areas. As occurred in other islands where P. lotor was introduced, it is expected that it could become a future problem for the conservation biodiversity in insular ecosystems, as well as for agriculture and human activity. Due to the potential impact on native biodiversity it is necessary to reinforce the implementation of control actions and prevent its expansion to the rest of the island.
    Keywords agricultural land ; anthropogenic activities ; biodiversity ; body mass index ; diet ; ecosystems ; females ; human settlements ; invertebrates ; islands ; lactation ; omnivores ; plant residues ; Procyon lotor ; sex ratio ; vertebrates ; Balearic Islands ; Spain
    Language English
    Dates of publication 2019-0828
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2019.134191
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Article ; Online: Oxidative stress and behavioral responses of moorish geckos (Tarentola mauritanica) submitted to the presence of an introduced potential predator (Hemorrhois hippocrepis).

    Febrer-Serra, Maria / Lassnig, Nil / Colomar, Víctor / Picó, Gabriela / Tejada, Silvia / Sureda, Antoni / Pinya, Samuel

    The Science of the total environment

    2022  Volume 855, Page(s) 158864

    Abstract: Stressful situations induce an increase in the production of reactive oxygen species (ROS) which can lead to molecular damage and alteration of cell function. The introduction of new potential predators induces physiological stress in native fauna. ... ...

    Abstract Stressful situations induce an increase in the production of reactive oxygen species (ROS) which can lead to molecular damage and alteration of cell function. The introduction of new potential predators induces physiological stress in native fauna. However, behavioral responses have been reported in preys, demonstrating an induction of the defenses against alien species. Behavioral and antioxidant enzyme responses in the moorish gecko, Tarentola mauritanica, against the invasive predator horseshoe whip snake (Hemorrhois hippocrepis) were assessed. Behavior was recorded and a tissue sample from the tail was collected after placing the gecko in a terrarium with previous absence or presence of the snake in 'Control' and 'H. hippocrepis' groups, respectively. Fifteen behavioral variables were examined, including tongue flick (TF) and locomotion patterns. Antioxidant enzyme activities -catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione reductase (GR)-, and the levels of reduced (GSH) and oxidized glutathione (GSSG), glutathione/glutathione disulfide ratio (GSH/GSSG) and malondialdehyde (MDA) concentrations were measured in the tissue sampled. Geckos exposed to the snake's odor showed a higher number of TF, longer amounts of time remaining motionless or moving in slow motion and they spent less time on the ground in comparison to the 'Control' group. The presence of the snake produced a significant increase in the activities of CAT, SOD and GR and a decrease in the GSH/GSSG ratio in T. mauritanica individuals exposed to the snake's scent. Thus, both behavioral responses and oxidative stress biomarkers clearly showed that T. mauritanica is able to recognize H. hippocrepis as a potential predator, despite being a recently introduced snake at the Balearic Islands.
    MeSH term(s) Animals ; Glutathione Disulfide ; Antioxidants/metabolism ; Lizards/metabolism ; Catalase/metabolism ; Glutathione Reductase/metabolism ; Oxidative Stress/physiology ; Glutathione Peroxidase/metabolism ; Superoxide Dismutase/metabolism ; Glutathione/metabolism ; Colubridae/metabolism
    Chemical Substances Glutathione Disulfide (ULW86O013H) ; Antioxidants ; Catalase (EC 1.11.1.6) ; Glutathione Reductase (EC 1.8.1.7) ; Glutathione Peroxidase (EC 1.11.1.9) ; Superoxide Dismutase (EC 1.15.1.1) ; Glutathione (GAN16C9B8O)
    Language English
    Publishing date 2022-09-20
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2022.158864
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article ; Online: Assessment of the invasion process of the common raccoon Procyon lotor (Carnivora: Procyonidae) on a Mediterranean island a decade after its introduction.

    Lassnig, N / Colomar, V / Picó, G / Perelló, E / Febrer-Serra, M / Truyols-Henares, F / Pinya, S

    The Science of the total environment

    2019  Volume 699, Page(s) 134191

    Abstract: The common raccoon, Procyon lotor was introduced at the Balearic Islands (Spain) in 2006. Since then, a colonization process has been carried out, with captures of specimens in 24.30% of the surface of the whole Mallorca Island. For the first time, ... ...

    Abstract The common raccoon, Procyon lotor was introduced at the Balearic Islands (Spain) in 2006. Since then, a colonization process has been carried out, with captures of specimens in 24.30% of the surface of the whole Mallorca Island. For the first time, information has been provided on the invasive process of P. lotor in an insular ecosystem. 257 specimens of P. lotor were captured during the period 2007-2018, of them 104 were analysed to estimate population parameters. Demographic data showed that the population had a sex ratio of 1.00:1.21 (males:females), high BMI values and up to 40% of females were lactating when captured. Related to diet data, the composition was mainly the same as previous studies around its natural and introduced distribution area. Plant residues represented the 53.25 ± 38.66% followed by invertebrates with 12.22 ± 22.54%, inorganic remains with 11.9 ± 22.07% and finally the vertebrates with 4.94 ± 18.27%. Thus, it is shown how an opportunistic omnivorous species has adapted to the resources provided by the island. Cultivated plants' remains and plastic content in diet evidence that P. lotor is entering in contact with human settlements and agricultural areas. As occurred in other islands where P. lotor was introduced, it is expected that it could become a future problem for the conservation biodiversity in insular ecosystems, as well as for agriculture and human activity. Due to the potential impact on native biodiversity it is necessary to reinforce the implementation of control actions and prevent its expansion to the rest of the island.
    MeSH term(s) Animals ; Biodiversity ; Ecology ; Ecosystem ; Introduced Species ; Mediterranean Islands ; Raccoons ; Spain
    Language English
    Publishing date 2019-08-29
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2019.134191
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  6. Article ; Online: First report of heavy metal presence in muscular tissue of loggerhead turtles Caretta caretta (Linnaeus, 1758) from the Balearic Sea (Balearic Islands, Spain).

    Febrer-Serra, Maria / Renga, Emanuela / Fernández, Gloria / Lassnig, Nil / Tejada, Silvia / Capó, Xavier / Pinya, Samuel / Sureda, Antoni

    Environmental science and pollution research international

    2020  Volume 27, Issue 31, Page(s) 39651–39656

    Abstract: The concentrations of cadmium (Cd), mercury (Hg) and lead (Pb) were determined in muscular tissue of eleven loggerhead turtles (Caretta caretta) from the Balearic Islands (Spain, Western Mediterranean). The metal levels found in the present study were ... ...

    Abstract The concentrations of cadmium (Cd), mercury (Hg) and lead (Pb) were determined in muscular tissue of eleven loggerhead turtles (Caretta caretta) from the Balearic Islands (Spain, Western Mediterranean). The metal levels found in the present study were similar or lower than concentrations detected in Andalusia (mainland Spain), Italy, Canary Islands (Spain) or Japan. As the main source of metals in the loggerhead turtle is the diet, low metal burdens could be explained by its opportunistic feeding way. No significant differences were found in metal concentrations between juveniles and subadults in any of the heavy metals analysed. Furthermore, no significant correlation was detected between heavy metal concentrations and straight carapace length (SCL) of the studied individuals. These results could derive from the homogeneity in age and size of the turtles sampled, so further studies including adults are needed in order to assess the heavy metal accumulation with turtle growth.
    MeSH term(s) Animals ; Italy ; Japan ; Mediterranean Sea ; Metals, Heavy/analysis ; Spain ; Turtles ; Water Pollutants, Chemical/analysis
    Chemical Substances Metals, Heavy ; Water Pollutants, Chemical
    Language English
    Publishing date 2020-08-18
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-020-10464-1
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    In stock of ZB MED Bonn / Germany

    Z 5915: Show issues

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