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    It takes a wood to raise a tree: a memoir

    BOOK REVIEW
    07 June 2021

    It takes a wood to raise a tree: a memoir

    An ecologist traces forests’ support networks — and finds parallels in her own life.

    Emma Marris

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    Emma Marris

    Emma Marris is an environmental writer who lives in Klamath Falls, Oregon.

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    Douglas firs in British Columbia, Canada: ‘mother trees’ help seedlings all around to flourish.Credit: Getty

    Finding the Mother Tree: Discovering the Wisdom of the Forest Suzanne Simard Knopf (2021)Growing up in the rainforests of the Pacific Northwest, I often grieved that their beauty — sky-high Douglas firs, rustling alders, sword ferns draped across the slopes — was born of a brutal battle for light, water and nutrients. So I thought.In 1997, ecologist Suzanne Simard made the cover of Nature with the discovery of a subterranean lace of tree roots and fungal filaments, or hyphae, in British Columbia (S. Simard et al. Nature 388, 579–582; 1997). It was “a network as brilliant as a Persian rug”, she recalls in her memoir Finding the Mother Tree — a network through which multiple tree species were exchanging carbon. The trees were cooperating.The discovery of this fungal network, or ‘wood wide web’, as it came to be known, upended a dominant scientific narrative — that competition is the primary force shaping forests. Forest ecology is instead a much more nuanced dance, in which species sometimes fight and sometimes get along. This calls into question the way that most foresters manage trees. Clear-cutting, weeding and planting single species in well-spaced rows makes sense only if trees do best when they have all the resources they need to themselves.
    Rediscovering the bush telegraph
    Throughout her career, Simard has shown that, in fact, it takes a whole ‘village’ to raise a tree. Alders fix atmospheric nitrogen, which can then be used by pines and other tree species. Older, deeper-rooted trees bring up water from lower in the soil to shallow-rooted plants. Carbon, water, nutrients and information about threats and conditions are shared across the fungal-root network. When Douglas firs are infested with western spruce budworm (Choristoneura occidentalis), they alert pines to which they are connected through the wood wide web, and these respond by producing defence enzymes. In the middle of all this activity are the mother trees. The oldest, largest and most experienced, they subsidize the growth and flourishing of seedlings all around.Simard creates her own complex network in this memoir, by weaving the story of these discoveries with vignettes from her past. The themes of her research — cooperation, the legacies that one generation leaves for the next, the ways in which organisms react to and recover from stress and disease — are also themes in her own life. The network of friends, family and colleagues who support Simard, as a scientist and as a woman, is visible throughout: as central to the story as a forest’s web of fungal filaments and delicate rootlets.Simard’s life story is, of course, unique, yet it has a striking universality. After working for a logging company, she moved into government service and then into academia, trying in each job to untangle the subterranean mysteries of the forest. She fought to have her ideas taken seriously in a male-dominated field. (There are shades of Lab Girl, by US geobiologist Hope Jahren, in her clear-eyed depictions of what she has to deal with behind the scenes — from being passed over for jobs for which she was the best candidate, to being called “Miss Birch” behind her back, a sound-alike for a much harsher epithet.) Simard found love, lost it, and found it again. She struggled, like so many scientists, to balance her research and her roles as a wife and mother. She faced mortality when diagnosed with cancer.

    The thread-like roots of fungi are an essential element of a forest’s ‘wood wide web’, through which trees exchange carbon, water, nutrients and information.Credit: Claire Welsh

    Moving through life’s highs and lows with her is rewarding because of these resonances, and because she comes across as the kind of person who usually doesn’t write memoirs — shy and occasionally fearful, always earnest. It feels like a privilege to be let into her life.The muddy, stressful and occasionally exhilarating experience of fieldwork shines through. “Jittery with adrenaline”, while labelling seedlings in one field experiment, she describes feeling “as if I were about to parachute out of a plane, maybe land on Easter Island”. Simard got her first morsel of proof for her theory in 1993, while kneeling on the forest floor holding a Geiger counter to detect the radioactive carbon-14 that she used to track carbon flows through plants and fungi. “I was enraptured, focused, immersed, and the breeze sifting through the crowns of my little birches and firs and cedars seemed to lift me clear up,” she writes.After publishing her Nature paper, Simard showed that trees direct more resources to their offspring than they do to unrelated seedlings. The finding suggests that trees maintain a level of control through the network that one might call intelligence. As she argues, plants seem to have agency. They perceive, relate and communicate, make decisions, learn and remember, she writes: “qualities we normally ascribe to sentience, wisdom”. For Simard, that implies that they are due a certain respect.
    The community of trees
    She does not spell out the ethical implications, but the ideas raise fascinating moral questions. What responsibilities do we owe plants? Is logging or farming crops, to harvest and eat, cruel? What kinds of legal right might a tree have if we base our theories of rights on whether individuals, such as humans and chimpanzees, have intelligence or sentience?It is tempting to ascribe the dominance of the ‘brutal competition’ narrative to the fact that ecology was dominated by men, and to find poetic power in the idea that a woman saw cooperation when her male colleagues couldn’t. But Simard tells a more complex tale. She struggled to see the truth in the soil and in her heart — and got there only because she was determined and intuitive.Simard writes that big old trees are “mothering their children” by sending them, through the forest network, sugars, water, nutrients and information about threats. Reading this on page 5, I was sceptical. By the end I was convinced. The beauty of the forests of my youth turns out to be shaped, in a sense, by love.

    Nature 594, 171-172 (2021)
    doi: https://doi.org/10.1038/d41586-021-01512-y

    Competing Interests
    The author declares no competing interests.

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    Concentration of cadmium and lead in vegetables and fruits

    Results of chemical analysisThe results of the study showed that the concentrations of Cd and Pb among all analyzed fruit samples (n = 242) were below the associated LOQs in only 87 and 96 samples, respectively. Similarly, in vegetable samples (n = 128) we found that Cd and Pb concentrations were below the LOQ in 31 and 69 samples, respectively. The levels of the Cd and Pb in the analyzed food samples were compared and contrasted with the maximum levels in foodstuffs regulated by legal acts: Commission Regulation (EU) No 488/2014 of 12 May 2014 amending Regulation (EC) No 1881/2006 as regards maximum levels of cadmium in foodstuffs and Commission Regulation (EU) 2015/1005 of 25 June 2015 amending Regulation (EC) No 1881/2006 as regards maximum levels of lead in certain foodstuffs3,4. It was found that in 12 food samples, the Cd content exceeded the maximum acceptable level. Among the fruit samples, this result was observed in: frozen raspberries (n = 1; 122% of maximum level) and frozen strawberries (n = 1; 114% of maximum level). In the case of vegetables, this result was observed in: fresh beetroots (n = 2; 203% and 670% of maximum level), frozen carrot (n = 1; 113% of maximum level), fresh celery (n = 4; 130%, 150%, 345%, 356% of maximum level) and processed tomatoes (n = 3; 102%, 112%, 134% of maximum level). The maximum permissible Pb level was exceeded in 3 analyzed food samples: fresh beetroot (n = 1; 135% of maximum level), frozen carrot (n = 1; 117% of maximum level) and 1 sample of frozen tomatoes in which the Pb concentration was up to 1074% of the acceptable limit (Table 5).Table 5 The number and type of food samples in which the maximum level of Cd or Pb has been exceeded.Full size tableTables 6 and 7 present the mean and SD, as well as the minimum and maximum values for the Cd and Pb contents in each of the analyzed fruits (Table 6) and vegetables (Table 7). Heavy metals concentrations were reported in mg/kg f.m. (fresh mass) in the fresh, frozen and processed products, while the content of Cd and Pb in dried products were presented in mg/kg d.w. (dry weight). Lack of a value in the tables means that the Cd or Pb value was below the LOQ for that particular sample.Table 6 The mean value, standard deviation, minimum and maximum values ​​of Cd and Pb concentrations in particular types of fruit samples.Full size tableTable 7 The mean value, standard deviation, minimum and maximum values of Cd and Pb concentrations in particular types of vegetable samples.Full size tableThe analysis of Cd and Pb contents in all food products is necessary due to the possibility of assessing the health risks associated with consumption of contaminated ready-to-eat different types of food. A review of the scientific literature showed that the issue of food contamination with heavy metals is discussed by several researchers. However, they mostly include only fresh fruits and vegetables. Additionally, there is a little data concerning the level of heavy metals contamination of vegetables and fruits cultivated in other European countries in the available literature. Consequently, the results presented in this paper may form the basis for further research on the scale of food contamination with heavy metals such as Pb and Cd.Among fruits such as apples, pears, raspberries and strawberries, the highest average values of both Cd and Pb were observed in dried products (Cd: 0.023, 0.015, 0.116, 0.131 mg/kg d.w., respectively; Pb: 0.127, 0.036, 0.111, 0.161 mg/kg d.w., respectively). In cranberry samples, the highest levels of Cd were determined in fresh fruits (0.008 mg/kg f.m.), while Pb—in processed products (0.01 mg/kg f.m.). In the case of grape samples, the same average Cd concentration was recorded in both dried and fresh products (0.001 mg/kg), while the highest Pb content was observed in processed products (0.07 mg/kg f.m.). In most fruit samples the lowest average Cd concentrations were determined in processed products (grapes, pears, raspberries and strawberries—0.0004, 0.0008, 0.009, 0.003 mg/kg f.m., respectively), while Pb—in fresh fruits (cranberries, grapes, pears—0.004, 0.005, 0.008 mg/kg f.m.) or processed (raspberries and strawberries—0.011 and 0.006 mg/kg f.m.). In apple samples, the same average Pb value was recorded in both fresh fruit and processed products (0.009 mg/kg f.m.).The content of Cd and Pb in fruits, in the results available in the literature, is very diverse. The demonstrated average Cd content in apples (0.001 mg/kg f.m.) is lower compared to studies from other regions of the world, including Great Britain (0.002 mg/kg f.m.)23. The amounts of Cd in raspberries and strawberries tested in Poland were higher compared to those investigated by Norton et al. (2015) (0.002 mg/kg f.m. vs 0.011 mg/kg f.m. and 0.002 mg/kg f.m. vs 0.018 mg/kg f.m.)23. Additionally, in samples collected in Turkey and Serbia, the Cd content in the analyzed products was below the LOQ24,25.Our results of Pb values in fruit samples are similar to those reported by some researchers and the range of values presented for this element in other analyses were very wide. However, as in the case of Cd content in apples purchased in Poland, Pb concentrations in these fruits (0.009 mg/kg f.m.) were also lower than other studies—minimum of 200%23. The average Pb content in grapes (0.009 mg/kg f.m.) was comparable to that obtained by Bağdatlıoğlu et al. (2010) (0.006 mg/kg f.m.)24. The results of author’s research regarding the content of Pb in raspberries (0.012 mg/kg f.m.) exceeded 2.5 times those published by Norton et al. (2015)23. Pb concentrations in strawberries (0.009 mg/kg f.m.) compared to other studies are in their lower range (0.010 mg/kg–0.027 mg/kg f.m.)23,24.The highest average concentrations of Cd were determined in fresh vegetables (beetroot and celery—0.235 and 0.152 mg/kg f.m., respectively) and dried—carrots and tomatoes (0.2 and 0.103 mg/kg d.w.), while Pb—in frozen vegetables (beetroots and tomatoes—0.173 and 0.294 mg/kg f.m.), as well as dried (carrots and celery—0.206 and 0.259 mg/kg d.w.). For most samples, the lowest average Cd and Pb levels were observed in processed products (beetroots, carrots, celery). Exceptions were samples of tomatoes—the lowest average Cd and Pb concentration values were observed in fresh foodstuffs (0.003 and 0.016 mg/kg f.m., respectively).Analyses conducted by other scientists indicate lower average Cd content in fresh beetroots (0.018–0.09 mg/kg f.m.)23,26 and higher by almost 600% in the case of Pb (0.58 mg/kg f.m.)26 compared to our research (Cd—0.235 mg/kg f.m.; Pb—0.095 mg/kg f.m.). Only the British study has shown lower Pb content (0.033 mg/kg f.m.)23. Our results—concentration of Cd (0.041 mg/kg f.m.) and Pb (0.027 mg/kg f.m.) in fresh carrot samples were similar to those obtained by other authors from the same territory in Poland, but also those from Great Britain, China or Brazil—Cd values ranged from 0.014 mg/kg f.m. to 0.03 mg/kg f.m., while Pb from 0.023 mg/kg f.m. to 0.971 mg/kg f.m.23,26,27,28. In the scientific literature we found only individual articles regarding celery heavy metal contamination. Guerra et al. (2012) showed 3 times lower Cd content in this vegetable—0.05 mg/kg f.m.26. The concentration of Pb in Brazilian research indicates higher content (0.47 mg/kg f.m.) than those obtained in this study (0.031 mg/kg f.m.)26. Tomatoes are the most frequently analyzed products, probably due to the easiness and simplicity of processing. Our analysis showed relatively low concentration of Cd and Pb in fresh tomatoes (Cd—0.003 mg/kg f.m.; Pb—0.016 mg/kg f.m.). In the most available scientific data Cd levels were in the range of 0.028 mg/kg f.m. to 0.033 mg/kg f.m., and Pb from 0.078 mg/kg f.m. to 0.18 mg/kg f.m.26,28. Only Norton et al. (2015) and Bagdatlioglu et al. (2010) noted lower or equal Cd and Pb values in the corresponding product23,24.Massadeh et al. (2018) in Jordan determined Pb and Cd of various canned fruits and canned vegetables including canned juice (pineapple), canned tomato sauce, canned whole carrots and canned green beans. They showed metal concentration levels in the samples were in the range of 0.50–0.60 mg/kg f.m. for Cd and 2.6–3.0 mg/kg f.m. for Pb29. These results significantly exceed the values shown in present study, as well as the results presented by Domagała-Świątkiewicz and Gąstoł (2012) in the analysis of vegetable juices (beetroot, carrot, celery)30.The high contamination found in vegetables might be closely related to the pollutants in irrigation water, farm soil, fertilizers and also industrial and low pollution household emissions. Differences in levels of contamination between fruits and vegetables may result from the specificity of the geographical area from which they are collected, their diverse capacity to accumulate heavy metals, as well as the way they are processed. It should be pointed out that in polluted environments (soil, water, and air), the presence of toxic metals in elevated concentrations is not uncommon. Due to the structure of consumption of various groups of food products both in Poland and other countries, a significant risk of exposure to heavy metals is associated with the consumption of fruits and vegetables, which are one of the main elements of the diet. Unfortunately, complete elimination of elements such as Cd or Pb from these products is impossible, and the technological processes used in food production can only remove a small part of the impurities from selected products or even contribute to their increased contamination. Thus, there is a need for regular monitoring of heavy metals on every kind of foodstuff, not only in fresh products, in order to estimate the health risk from heavy metals in the human food chain.Statistical analysisANOVAFor the purpose of ANOVA carried out to detect significant differences in the heavy metal concentrations of the four types of food (fresh, dried, frozen, and processed), samples with concentration value below the LOQ were removed from the analysis. In the case of Cd concentration, the value of F statistic was 11.15 for fruits and 4.049 for vegetables, leading to significant results with p-values below 0.001 and 0.01 respectively. For the of Pb concentration, the ANOVA results were even more extreme with F values of 56.59 for fruits and 7.13 for vegetables with associated p-values being below 0.001 in both cases. These results show that there is strong evidence to believe that mean Cd and Pb contents in the four types of fruits and vegetables are not equal (Table 8).Table 8 Analysis of variance (ANOVA) for variates in four groups.Full size tableOutlier analysisThe boxplots depicted in Fig. 1 were used to illustrate the outlier analysis for Cd and Pb. Each plot shows the median of the observations along with the lower quartile (Q1) and the upper quartile (Q3). The highest and the lowest observations are shown by the whiskers. From Fig. 1a, there appears to be two outliers in the dried fruits with values 0.277 and 0.210. From Fig. 1b, there seems to be six outliers in the fresh vegetables with values of 0.203, 0.670, 0.260, 0.690, 0.300 and 0.712. In Fig. 1c, we see two outliers in the processed fruits with values of 0.127 and 0.047. Finally, Fig. 1d shows that there is one one outlier in the frozen vegetable category with the value of 0.537.Figure 1Outlier analysis in case: Cd concentration in: (a) fruits, (b) vegetables, and Pb concentration in: (c) fruits, (d) vegetables.Full size imageOutliers associated with high Cd and Pb values in fruit and vegetable samples may be the result of sample contamination during technological processes or vegetables/fruits cultivation in a polluted agricultural area.Post-hoc multiple comparisonSince the ANOA results indicated significant differences among the mean concentrations of Cd and Pb both in fruits and vegetables, to further detect the specific different means, the Tukey HSD test22 was applied. The results are presented in Fig. 2. For the Cd concentration, comparison of all pairs of means indicated that the content of Cd in dried fruits is significantly different from mean concentrations of other types of food namely fresh, frozen, and processed fruits, see Fig. 2a. In the case of vegetables, the mean Cd contents of fresh and processed vegetables are different, see Fig. 2b, although mean Cd content of frozen and fresh vegetables are also significantly different if a significance level of 10% is used. Upon analyzing the mean concentrations of Pb in fruits, we found that the mean content of dried fruits was significantly different from the other three types, namely fresh, frozen and processed, see Fig. 2c. For the Pb concentrations in vegetables, a highly significant difference was detected between the means of processed and dried vegetables. In addition, mean Pb concentrations of fresh versus dried and processed versus frozen vegetables were significantly different, see Fig. 2d.Figure 2Post-hoc Multiple Comparison Tukey-Test of Cd and Pb in all samples of fruits and vegetables; differences in Cd mean concentration of: (a) fruits, (b) vegetables; differences in Pb mean concentration of: (c) fruits, (d) vegetables.Full size image More

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