Assessment of nickel and chromium concentrations in black kite (Milvus migrans) tissues.
The black kite (Milvus migrans) is a widespread bird-of-prey that opportunistically exploits a wide array of food sources for instance, it captures live prey such as insects, reptiles, birds and small mammals throughout nearly all habitats from desert to forest and near rivers (Scheider et al, 2004; Shiraishi et al, 1990). In Pakistan, these kites exist throughout Punjab and their range varies by season (Altaf et al, 2013). Raptors (e.g. black kite) are considered good bioindicators for several reasons, viz., they are common, widespread, conspicuous, show toxic effects for environmental pollutants and are more sensitive to environmental changes (Furness, 1993). Predatory species of birds occupy the top of the food chain; hence they tend to bioaccumulate certain pollutants, and therefore, are used to monitor them. Furthermore, yield information over a large area around each sampling site is very important for bioavailability of contaminants as well as how, where and when they are transferred within the food chain (Zaccaroni et al., 2008; Jager et al., 1996).
In Pakistan, the rapid rise in human population, industrialisation and agriculture practices have major impacts on environmental contamination (Abbas et al., 2012; Chandra and Kulshreshtha, 2004; Horrigan et al., 2002; Baluch, 1995). Heavy metals are one of the pollutants and contaminate the environment through various routes viz., mining, smelting, agricultural and natural activities (Navarro et al., 2008; Vaalgamaa and Conley, 2008; Brumelis et al., 1999). Chemical and metallurgical industries are the most important sources of heavy metals in the environment (Cortes et al., 2003; Stawarz et al., 2003; Raji and Anirudhan, 1997).
Although, some of the heavy metals are needed by organisms in trace amounts, but when present in excess, they can cause enzymes to denature, interact with nuclear proteins and DNA, causing oxidative deterioration of biological macromolecules and hampering the reproductive output and even causing death (Leonard et al., 2004; Sanpera et al., 2000; Chapman and Reiss, 1999). When either dietary concentrations or exposure times are long enough, some trace metals have the potential to reach toxic levels in the kidney (Nordberg, 1978; Friberg, 1952). The metals such as copper, manganese, nickel and zinc are regulated strongly by invertebrates because they are essential to many enzymes, while some metals are not essential including cadmium, chromium and lead. Metals accumulation may be a serious threat to the survival of wild birds and other organisms (ASTDR, 2005; Hernandez et al., 1999).
The metal residues in plant and animals represent a balance between rates of uptake, detoxification, storage and excretion. These depend on the metal, diet, and physiology. Nickel is essential to birds, but chromium is not (Furness et al., 1990). Chromium is a genotoxic can act as cancer agent when directly inhaled. Moreover, chromium compounds are very corrosive and can severely burn the skin. Such burns make it easier for chromium to be absorbed through the skin with the potential for causing systemic toxicity (Guertin, 2004). Whereas, nickel has various adverse health effects due to exposure and its compounds cause skin allergies, lung fibrosis, and lung cancer (Zhao et al., 2009). Keeping in view the impact of metal accumulation in birds, the present study was designed to assess nickel and chromium level in the keel muscles and livers of male and female black kite from Gujrat district (northern Punjab), Pakistan.
Materials and Methods
The present study was conducted at two sites (a) Gujrat (34[degrees]17'26.05"N; 72[degrees] 9'39.23"E), an ancient district of Pakistan located between two famous rivers, i.e., Jhelum and Chenab, and (b) at Kotla Arab Ali Khan (32[degrees]51'7.63"N and 74[degrees] 4'23.57"E), a town and Union Council of Tehsil Kharian. Chromium and nickel concentrations have been increased in recent years due to human activities. For instance human activity contributes to Cr in the environment (air, surface water, groundwater, soil) from chromium plating, chemical manufacturing of chromium, and evaporative cooling towers (ATSDR, 2005). Combustion of coal and oil also release large quantities of chromium (ATSDR, 2005). Nickel and nickel compounds are widely used in making metal coins and jewellery and in industry for making items such as valves and heat exchangers. Most of the nickel is used to make stainless steel. There are also compounds consisting of nickel combined with many other elements, including chlorine, sulphur and oxygen (Zhao et al., 2009).
A total of 24 black kites were collected (March to August 2013) from Gujrat and Kotla Arab Ali Khan (both were reference sites), 12 from each, comprising of 13 females and 11 males, out of which 14 were adults and 10 were sub adults. They were randomly collected by gun shooting, then weighed, measured, and dissected. Organs were preserved in 70% ethyl alcohol for later analysis.
Physical conditions were examined prior to necropsying to determine the health of specimens. Specifically, wet weight (wwt, g), and tarsus length (cm), were examined. Then, samples of keel muscle i.e., lungs, liver, heart, spleen, and trachea, all parts of gastrointestinal tract, kidneys, ovary and brain were taken in aluminum foil and shifted to ultra-low freezer at -80 [degrees]C and metal residues in liver and breast muscles were reported. Liver and breast muscle samples were digested in reagent grade nitric acid (70% concentration). Digested samples were subsequently diluted in de-ionised water and analysed for Cr and Ni using atomic absorption spectroscopy (Perkin Elmer 400) in the chemistry lab, university of Gujrat, Gujrat, Pakistan. The data obtained is presented in wet weight basis.
Statistical analysis. The data was first log transformed, then analysis of variance was applied to compare gender, location, metals and tissues. Moreover, correlations between nickel and chromium, breast muscle and liver were applied by using SPSS (Statistical software 13.0 version). The 0.05 level of significance was used for all statistical analysis.
Results and Discussion
Table 1 shows the comparison of heavy metals viz., Ni and Cr concentrations in breast muscles and livers of black kite at two localities (Kotla Arab Ali khan and Gujrat). Overall male birds quantitatively contained lower concentrations of both Ni and Cr in their breast muscles compared to females at both sampling sites. At Kotla, male birds contained 36.12 [+ or -] 5.84 mg/L and female 38.75 [+ or -] 6.18 mg/L concentrations of Ni in their breast muscles and almost similar trends were recorded for Ni concentration both in males and females breast muscles in Gujrat. Very interestingly, irrespective of Ni concentration, Cr concentration was recorded higher in female breast muscles (2.04 [+ or -] 0.07 mg/L) than males at Kotla. Nickel and Cr concentrations were higher in livers of males and similar trends were found on both localities, except in Gujrat, where Cr concentration (2.02 [+ or -] 0.12 mg/L) was recorded slightly higher in livers of males.
Table 2 shows analysis of variance (ANOVA) of nickel and chromium concentrations among muscles, gender, location and metals. There was significant (P<0.05) difference between muscles, location and metals, while non-significant difference between gender. Furthermore, there was interaction effect between gender x location, gender x metal and location x metal. Whereas, there was no interaction effect between muscle x gender, muscle x location and muscle x metal
Both muscles and liver samples from Kotla showed positive correlation, while samples from Gujarat were negatively correlated. At Kotla, Ni and Cr concentration was positive but non significant ([R.sup.2] = 0.324; P = 0.304) correlation was observed in black kite muscle, while Ni and Cr concentrations of liver samples were significant ([R.sup.2] = 0.599; P = 0.040). At Gujrat, negative correlations were recorded for Ni and Cr in muscle ([R.sup.2] = -0.326) and liver (R2 = -0.271) (Table 3) but both were non significant (P = 0.301 &P = 0.393).
There was almost fair balance between males (n= 11) and females (n = 13), furthermore, these 24 were categorized into adults (n= 14) and sub-adults (n= 10) of black kite collected from Kotla and Gujrat. This makes the capturing method quite random. The metal quantification from raptors tissues is considered a valuable method for prediction of their habitat's quality and contamination, and furthermore, it indicates the potential risk of exposure for birds and humans (Zaccaroni et al., 2008; Fox, 2001; Rainbow and Blackmore, 2001; Movalli, 2000).
Outridge and Scheuhammer (1993) described level of metals in tissues of wild mammals and birds, and reported maximum value of Ni concentration in uncontaminated (~0.1 to 5 [micro]g/g ) and contaminated (-0.5 to 80 [micro]g/g) on dry weight basis. In the present study, the Ni concentration 37.43 [+ or -] 5.90 mg/L and 35.18 [+ or -] 5.53 mg/L were recorded from muscles and livers respectively from Kotla, whereas in Gujrat 38.70 [+ or -] 2.10 mg/L and 35.07 [+ or -] 4.72 mg/L were, found in muscles and livers, respectively. It is higher than the concentrations documented by Zaccaroni et al. (2008) and Van Wyk et al. (2001). Van Wyk et al. (2001), documented Ni concentration (dry matter basis) in liver and muscles of three vultures viz., white backed vulture (Pseudogyps africanus) contained 13.92 [+ or -] 4.64 [micro]g/g and 10.75 [+ or -] 4.37 [micro]g/g, respectively, Lappet faced vulture (Torgos tracheliotos) contained 7.83 and 9.23 [micro]g/g, respectively, whereas, Cape griffon (Gyps coprotheres) contained 11.40 [micro]g/g in muscles and 12.82 [micro]g/g in liver. Eisler (1998) reported Ni concentration in Anas platyrhynchos (0.1-1.4 mg/kg fresh wt.) in liver and breast muscles (0.1-0.8 mg/kg fresh wt.). Phalocrocorax atriceps muscles (0.29 mg/kg dry wt.), liver of Bonasa umbellus (1.0 mg/kg dry wt.), Fulica Americana from (1.5 mg/kg fresh wt.) in muscle, Gavia immer (1.1 mg/kg fresh wt.), Larus fuscus in liver (2.0 mg/ kg dry wt.) and in muscle (5.0 mg/kg dry wt.). This present work indicates alarming conditions with respect to nickel concentration in the studies areas. This alarming Ni concentration in the study area is due to electrical industry and vehicles exhaust etc. from where Ni is emitted (Khan et al., 1990).
Chromium is an essential element for all animals, however its tissue concentrations (>4 mg/kg dry wt.) indicates alarming conditions (Outridge and Scheu-hammer, 1993). Eisler (1986) reported that electroplating and metal finishing industries, municipal treatment plants, tanneries, oil drilling operations, and cooling towers are major factors for elevation of Cr levels in soil, air, water, and biota. Korenekova et al. (2008) reported Ni (0.548 mg/kg) concentration in pheasants. In the present study, Cr concentration in muscles samples from Kotla and Gujrat was 1.90 [+ or -] 0.61 mg/L and 1.74 [+ or -] 0.56 mg/L, respectively, while in liver it was 1.91 [+ or -] 0.58 mg/L and 1.67 [+ or -] 0.51 mg/L, respectively. Our findings are closely in line with the report of Eisler (1986), where Somateria mollissima and L. fuscus muscle, liver, kidney, and egg contained Cr concentration (<1.0 mg/kg dry wt.), Aythya valisineria constituted 0.02 mg/kg fresh wt. Cr concentration in liver, Pandion haliaetus and Pelecanus occidentalis, with concentration of chromium in liver of 0.2 mg/kg fresh wt. Furthermore, he reported that Cr concentration greater than 4.0 mg/kg dry wt., indicated Cr contamination. In the present study, Cr concentration was recorded lesser than the toxic level (<4 mg/kg dry wt.).
The present work revealed that black kite can be used as a biomonitor of heavy metals contaminated environment. Ni and Cr concentration not only varies in sex groups but also in different age groups in black kite. The present study evaluated metals concentrations in small samples of black kite (in limited areas); it would be desirable to better understand metal residues in kite populations from uncontaminated reference areas as well as contaminated areas, especially metal doses to the embryos during nesting.
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Shahid Mahmood (a), Muhammad Waseem Mumtaz (b), Amina Khatoon (a), Majid Hussain (a) and Muhammad Nadeem Abbas (a) *
(a) Department of Zoology, University of Gujrat, Gujrat, Pakistan
(b) Department of Chemistry, University of Gujrat, Gujrat, Pakistan
* Author for correspondence; E-mail: firstname.lastname@example.org
(received Julyl 15, 2013; revised April 14, 2014; accepted April 22, 2014)
Table 1. Analysis of nickel and total chromium concentrations mg/ L wet wt in black kite tissues of Kotla Arab Ali Khan and Gujrat, Pakistan in 2013 Biological Gender Ni material n Kotla Gujrat Mean [+ or -] SD Mean [+ or -] SD Muscle Both sexes 12 37.43 [+ or -] 5.90 38.70 [+ or -] 2.10 Male 06 36.12 [+ or -] 5.84 37.83 [+ or -] 2.10 Female 06 38.75 [+ or -] 6.18 39.32 [+ or -] 2.01 Liver Both sexes 12 35.18 [+ or -] 5.53 35.07 [+ or -] 4.72 Male 05 34.67 [+ or -] 6.22 33.42 [+ or -] 6.19 Female 07 35.69 [+ or -] 5.29 36.25 [+ or -] 3.31 Biological Gender Cr material n Kotla Gujrat Mean [+ or -] SD Mean [+ or -] SD Muscle Both sexes 12 1.90 [+ or -] 0.61 1.74 [+ or -] 0.56 Male 06 1.76 [+ or -] 0.87 1.93 [+ or -] 0.14 Female 06 2.04 [+ or -] 0.07 1.58 [+ or -] 0.70 Liver Both sexes 12 1.91 [+ or -] 0.58 1.67 [+ or -] 0.51 Male 05 1.70 [+ or -] 0.80 2.02 [+ or -] 0.12 Female 07 2.12 [+ or -] 0.07 1.41 [+ or -] 0.54 Table 2. Analysis of variance (ANOVA) of nickel and chromium concentrations among muscles, gender, location and metals, Pakistan in 2013 Source df MS F P Muscle 1 0.013 7.39 0.008 Gender 1 0.000061 0.33 0.566 Location 1 0.0072 3.96 0.049 Metal 1 41.10 22350.9 0.000 Muscle x Gender 1 0.000026 0.01 0.905 Muscle x Location 1 0.000096 0.52 0.471 Muscle x Metal 1 0.004 1.95 0.166 Gender x Location 1 0.068 37.36 0.000 Gender x Metal 1 0.008 4.41 0.038 Location x Metal 1 0.011 5.89 0.017 Error 85 0.0018 -- -- Table 3. Paired samples correlation between metals concentrations of liver and keel muscles in black kites (Milvus migrans) at Kotla Arab Ali Khan and Gujrat, Pakistan 2013 Sites Correlated Biological n [R.sup.2] P-value metals material Kotla Ni vs Cr Muscle 12 0.324 0.304 Ni vs Cr Liver 12 0.599 0.040 Gujrat Ni vs Cr Muscle 12 -0.326 0.301 Ni vs Cr Liver 12 -0.271 0.393
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|Author:||Mahmood, Shahid; Mumtaz, Muhammad Waseem; Khatoon, Amina; Hussain, Majid; Abbas, Muhammad Nadeem|
|Publication:||Pakistan Journal of Scientific and Industrial Research Series B: Biological Sciences|
|Date:||Jul 1, 2014|
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