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Morphological Abnormalities in Anurans from Central Mexico: a Case Study (Anura: Ranidae, Hylidae)

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Morphological Abnormalities in Anurans from Central Mexico: a Case Study (Anura: Ranidae, Hylidae) heRPetoZoa 27 (3/4): 115 - 121 115 Wien, 30. Jänner 2015 Morphological abnormalities in anurans from central Mexico: a case study (anura: Ranidae, hylidae) Morphologische anomalien bei anuren aus dem mittleren Mexiko: ein Fallbericht (anura: Ranidae, hylidae) oCtavIo MonRoy -v IlChIs & l ouRDes lIZZoulI PaRRa -l óPeZ & t RInIDaD BeltRán -l eón & J oRge a. l ugo & á ngel BalDeRas & M aRtha M. Z aRCo -g onZáleZ KuRZFassung hohe Raten an morphologischen anomalien (Mißbildungen) werden bei amphibien auf die einwirkung von Parasiten, chemischen substanzen, uv-strahlung und Beutegreifern zurückgeführt. Ziele der vorliegenden untersuchung waren die quantitative und qualitative erfassung grobmorphologischer äußerer Mißbildungen an anuren des sierra nanchititla naturreservats (Mexiko) sowie die Identifizierung möglicher ursachen. sechs (6.23 %) der 95 gefangenen Individuen von Lithobates forreri (BoulengeR , 1883) sowie je ein „Beifangexemplar“ von Lithobates zweifeli (h IllIs , F Rost & W eBB , 1984) und Hyla arenicolor CoPe , 1866 zeigten insgesamt acht typen morphologischer Mißbildungen . Die beobachtete Mißbildungsrate lag somit geringfügig über dem mit fünf Prozent angenommenen hintergrundwert einer Population. an Makroparasiten wurden nematoda (Ozwaldocruzi a sp. und Rhabdias savagei ) und trematoda ( Haematoloechus sp. und Gorgoderina tarascae ) an inneren organen sowie Milben der gattung Hannemania auf der Körperoberfläche festgestellt. In den Muskel - gewebsproben, waren die Metalle Blei (Pb) und Kupfer (Cu) nicht nachweis- oder quantifzierbar, während Zink (Zn) in niedrigen (physiologischen) Konzentrationen vorlag. In den Wasserproben wurde Pb nicht nachgewiesen, die Zn and Cu Konzentrationen lagen innerhalb der in Mexiko zulässigen grenzwerte für Fließgewässer. Die autoren schließen als ursache der beobachteten, erhöhten Mißbildungsrate aus: (1) die tätigkeit von Makroparasiten, auf - grund des Fehlens von trematoda der gattung Riberoia , von denen man weiß, das sie Mißbildungen verursachen können und (2) die einwirkung von Pb, Cu and Zn. Mögliche andere ursachen werden angesprochen. aBstRaCt high rates of morphological abnormalities (malformations) in amphibians are attributed to parasites, chem - ical pollution, uv radiation and selective predation. the objectives of this study were to quantify and qualify the external, gross-morphological abnormalities in anurans of the sierra nanchititla natural Reserve (Mexico) and to identify possible causes. six specimens (6.23 %) out of 95 Lithobates forreri (BoulengeR , 1883) , as well as two “bycatch“ speci - mens of Lithobates zweifeli (h IllIs , F Rost & W eBB , 1984), and Hyla arenicolor CoPe , 1866, showed a total of eight types of morphological abnormalities . the observed abnormality rate thus slightly exceeded the assumed back - ground rate of five percent in a population. among macroparasites, nematoda ( Ozwaldocruzi a sp. and Rhabdias savagei ) and trematoda ( Haematoloechus sp. and Gorgoderina tarascae ) were present in internal organs, and chig - ger mites ( Hannemania sp.) on the skin. In the muscle samples, lead (Pb) and copper (Cu) were not detected nor quantified, whereas low (physiological) concentrations of zinc (Zn) were found. In the water samples, Pb was not detected and Zn and Cu was within the level for rivers as accepted in Mexico. the authors reject as possible caus - es for the observed, increased rate of abnormalities: (1) the effect of macroparasites, due to the absence of trematoda of the genus Riberoia that are known to develop anatomical abnormalities; and, (2) chemical pollution by Pb, Cu and Zn. Possible causes are discussed. Key WoRDs amphibia: anura: Hyla arenicolor , Lithobates forreri , Lithobates zweifeli , morphological abnormalities, mal - formations; heavy metals; parasites, veterinary medicine, ecotoxicology; sierra nanchititla natural Reserve, Mexico IntRoDuCtIon In various ecosystems, amphibians brate class since its representatives inhabit constitute the largest fraction of vertebrate both aquatic and terrestrial habitats ( Cohen biomass ( BlausteIn et al. 1994). Biological 2001; B lau steIn & J ohnson 2003 ). Due to diversity is particularly high in this verte - these traits and, among others, the perme - 116 l. l. PaRRa -l óPeZ et al. able and unprotected skin these animals are percent ( stoCuM 2000; J ohnson et al. considered particularly susceptible to en - 2002). Frequencies above normal can result vironmental changes ( Cohen 2001), and from environmental factors such as pollu - thus, appropriate indicators of environmen - tion, uv radiation, presence of parasites or tal disturbances such as chemical pollution selective predation, all of which potentially and changes in temperature, precipitation, pose threat to the affected amphibian popu - and ultraviolet radiation ( Cohen 2001; B lau- lation ( Cohen 2001; g Ray et al. 2002; steIn & J ohnson 2003). BlausteIn & J ohnson 2003; B eeBee & In several zones of the world, the gRIFFIths 2005; P Iha et al. 2006; stolyaR number of amphibians featuring anatomical et al. 2007; lannoo 2008; B allengee & abnormalities is reported to be on the rise sessIons 2009). (gaRDIneR et al. 2003). In this vertebrate the present study quantifies the gross class, the normal frequency of abnormalities morphological abnormalities observed in (gross morphological malformations attrib - anurans of the Mexican sierra nanchititla uted to failures in embryonic development natural Reserve (snnR), and assesses met - caused by genetic alterations or traumata) als (copper, lead, and zinc) and parasites as was estimated to range from zero to five possible causes. MateRIals anD MethoDs sierra nanchititla natural Reserve and specimens of Forrer’s grass Frog, (snnR) is located in central Mexico, sierra Lithobates forreri (BoulengeR , 1883), a Madre del sur Province, and extends across species in which abnormalities had been 663,887 km 2 at 19°36’46” - 18°45’38” n registered earlier in the study area. the ran - and 100°15’54” - 100°36’28” W, in the domly captured individuals (95 adults with physiographic region of the Balsas River and without visible abnormalities) were Basin. the vegetal cover comprises pine- taken to the lab, where the abnormalities of oak forest, broadleaf forest, low deciduous each individual were identified according to forest, induced grassland and cultivation. the literature ( MeteyeR 2000; u. s. FIsh however, these latter two increased their anD WIlDlIFe seRvICe 2007 ; lannoo extension due to forest extraction, which 2008). the frogs were killed by inhalation favored the creation of new cultivation and of chloroform; permission was not needed livestock breeding zones ( MonRoy -v IlChIs for this purpose. voucher photographs were et al. 2008). For the reserve, the presence of taken from the anomalies with a 4.0 20 amphibian species is reported ( Casas - megapixel Minolta camera. the frequency anDReu & a guIlaR -M Iguel 2005). accord - of abnormalities observed in L. forreri was ing to the Institute for the Pro motion of calculated as the percentage of individuals Mining and geological studies of the state with ab normalities (%) relative to the cap - of Mexico, there are mining activities of tured total of the species. economic importance in the snnR area, By means of a stereo microscope, in aiming on the exploitation of non-ferrous all the captured individuals an external revi - and precious metals. the registered locali - sion was made to identify the presence of ties are la Candelaria (gold and copper ectoparasites and a ventral incision to look [Cu]), Cañadas de nanchititla (silver, lead for endoparasites in the visceral organs. [Pb] and zinc [Zn]), luvianos (disseminated Macroscopic parasites found were pre - copper) and agua Colorada (copper) served in 10 % formol. For the preparation (IFoMegeM 2008). of trematoda, Mayer’s paracarmine stain - the authors performed monthly field ing was applied, whereas nematoda were trips to snnR from June 2009 to July 2010 clarified in glycerin. the parasites were to conduct nonsystematic sampling of frogs later examined under a microscope to taxo - which was done manually and with the help nomically identify them with the help of of nets at various points along the river . identification keys ( slaDKy et al . 2000; sampling was restricted to 140 person hours león - R ègagnon & PaReDes -C alDeRón Morphological abnormalities in anurans from central Mexico 117 2002; BuRsey & g olDBeRg 2006; Mata - ferences between the metal levels observed lóPeZ 2006). in the tissues from individuals with and leg muscle tissue samples were taken without abnorm alities ( lInDgRen 1993). from all collected frogs and stored in cryo - During frog sampling, water samples vials at -4 °C for later analysis of their metal were taken directly from the water flow contents. For metal analysis, digestion of (BautIsta 2004) in three random points the samples was made with nitric acid along the river; water sampling was done (hno 3) in two steps. Wet tissue samples of with plastic bottles, previously washed and 0.07 g each were added to 10 ml of hno 3 rinsed with a solution of 10 % hno 3. the overnight for pre-digestion at room temper - water samples were fixed with a solution of ature. the following day, the digestion of 10 % hno 3 until ph < 2 was obtained; the the samples was continued in a microwave bottles were labeled and stored at a temper - oven (CeM brand, model MaRs-5) for 10 ature below 4 °C to be transported to the minutes at 1200 W and a pressure of 150 laboratory. the analysis
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